Sample records for accelerated bridge construction

  1. Implementation guidance for accelerated bridge construction in South Dakota

    DOT National Transportation Integrated Search

    2017-09-01

    A study was conducted to investigate implementation of accelerated bridge construction (ABC) in South Dakota. Accelerated bridge construction is defined as construction practices that employ innovative techniques to reduce on-site construction time a...

  2. Compilation of accelerated bridge construction (ABC) bridges : final report.

    DOT National Transportation Integrated Search

    2016-01-01

    Development of accelerated bridge construction (ABC) technologies has been occurring across the country, many times in : isolation. Although FHWA and others have worked to facilitate communication between these efforts, there was not a : comprehensiv...

  3. Implementation Guidance for Accelerated Bridge Construction in South Dakota : Research Brief

    DOT National Transportation Integrated Search

    2017-09-01

    Investigate typical accelerated bridge construction methods and their applicability in South Dakota. A study was conducted to investigate the implementation of accelerated bridge construction (ABC) in South Dakota. The main objective of this study wa...

  4. Accelerating bridge construction to minimize traffic disruption : research spotlight.

    DOT National Transportation Integrated Search

    2013-12-01

    Since 2008, MDOT has been using accelerated bridge construction, which utilizes prefabricated components and structural placements, to minimize traffic disruptions during bridge replacement or rehabilitation. A recent project provided MDOT with a new...

  5. Research on evaluation and standardization of accelerated bridge construction techniques, part II.

    DOT National Transportation Integrated Search

    2015-09-01

    The Michigan Department of Transportation (MDOT) uses Accelerated bridge construction : (ABC) to reduce delays and minimize construction impacts. MDOT contracted and completed : several bridges using prefabricated bridge elements and systems (PBES). ...

  6. Research on evaluation and standardization of accelerated bridge construction techniques, part I.

    DOT National Transportation Integrated Search

    2015-09-01

    The Michigan Department of Transportation (MDOT) uses Accelerated bridge construction : (ABC) to reduce delays and minimize construction impacts. MDOT contracted and completed : several bridges using prefabricated bridge elements and systems (PBES). ...

  7. Evaluation of the Buena Vista IBRD bridge : a furthering of accelerated bridge construction in Iowa.

    DOT National Transportation Integrated Search

    2012-02-01

    The need to construct bridges that last longer, are less expensive, and take less time to build has increased. The importance of accelerated bridge construction (ABC) technologies has been realized by the Federal Highway Administration (FHWA) and the...

  8. Laboratory and field testing of an accelerated bridge construction demonstration bridge : US Highway 6 bridge over Keg Creek.

    DOT National Transportation Integrated Search

    2013-04-01

    The US Highway 6 Bridge over Keg Creek outside of Council Bluffs, Iowa is a demonstration bridge site chosen to put into practice : newly-developed Accelerated Bridge Construction (ABC) concepts. One of these new concepts is the use of prefabricated ...

  9. Toward Successful Implementation of Prefabricated Deck Panels to Accelerate the Bridge Construction Process

    DOT National Transportation Integrated Search

    2016-08-01

    The development of accelerated bridge construction (ABC) techniques and connection details has become a national research focus. With the aging of the interstate system and many bridges on key routes requiring extensive rehabilitation or replacement,...

  10. Accelerated bridge construction utilizing precast pier caps on state highway 69 over Turkey Creek, Huerfano County, CO.

    DOT National Transportation Integrated Search

    2014-07-01

    The purpose of this report is to document Accelerated Bridge Construction (ABC) techniques on IBRD : (Innovative Bridge Research and Development) project 102470 for the construction of Bridge N-16-Q : on State Highway 69 over Turkey Creek. The constr...

  11. Precast concrete elements for accelerated bridge construction : laboratory testing of precast substructure components, Boone County bridge.

    DOT National Transportation Integrated Search

    2009-01-01

    Vol. 1-1: In July 2006, construction began on an accelerated bridge project in Boone County, Iowa that was composed of precast substructure : elements and an innovative, precast deck panel system. The superstructure system consisted of full-depth dec...

  12. Seismic Performance of Columns with Grouted Couplers in Idaho Accelerated Bridge Construction Applications

    DOT National Transportation Integrated Search

    2016-10-16

    n Accelerated Bridge Construction (ABC) methods, one way to connect prefabricated columns is by using grouted steel bar couplers. As of October 2016, in the U.S., only Utah DOT allows the use of grouted couplers in plastic hinge locations in seismic ...

  13. Precast concrete elements for accelerated bridge construction : laboratory testing, field testing, evaluation of a precast concrete bridge, Madison County bridge.

    DOT National Transportation Integrated Search

    2009-01-01

    The importance of rapid construction technologies has been recognized by the Federal Highway Administration (FHWA) and the Iowa : DOT Office of Bridges and Structures. Recognizing this a two-lane single-span precast box girder bridge was constructed ...

  14. Study on Construction Technology of Municipal Road and Bridge Concrete

    NASA Astrophysics Data System (ADS)

    Tang, Fuyong

    2018-03-01

    With the continuous development of social economy and the accelerating process of urbanization, municipal road and bridge projects have also shown a trend of rapid development. Municipal road and bridge work can fully reflect the economic and cultural development level of cities and is also an important symbol of urban development. As a basic material of construction, concrete is widely used in engineering construction. This article will analyze the municipal road and bridge concrete construction technology, put forward corresponding measures.

  15. Rapid bridge construction technology : precast elements for substructures.

    DOT National Transportation Integrated Search

    2011-06-01

    The goal of this research was to propose an alternate system of precast bridge substructures which can : substitute for conventional cast in place systems in Wisconsin to achieve accelerated construction. : Three types of abutment modules (hollow wal...

  16. Development of bridge girder movement criteria for accelerated bridge construction.

    DOT National Transportation Integrated Search

    2014-06-01

    End diaphragms connect multiple girders to form a bridge superstructure system for effective resistance to earthquake loads. Concrete : girder bridges that include end diaphragms consistently proved to perform well during previous earthquake events. ...

  17. Precast concrete elements for accelerated bridge construction : laboratory testing, field testing, and evaluation of a precast concrete bridge, Black Hawk County.

    DOT National Transportation Integrated Search

    2009-01-01

    The importance of rapid construction technologies has been recognized by the Federal Highway Administration (FHWA) and the Iowa : DOT Office of Bridges and Structures. Black Hawk County (BHC) has developed a precast modified beam-in-slab bridge (PMBI...

  18. Accelerating Bridge Construction to Reduce Congestion

    DOT National Transportation Integrated Search

    2011-05-01

    The magnitude of the "residual" displacements at the end of an earthquake can affect the amount of time needed to restore a bridge to service. It may be possible to reduce these displacements (and downtimes) by introducing prestressing forces into br...

  19. Phase and widening construction of steel bridges : [summary].

    DOT National Transportation Integrated Search

    2014-03-01

    Maintaining traffic flow for bridge widening and replacement projects often requires bridges to be constructed in phases so that traffic can travel on one : portion of the bridge while another portion is being : constructed. The bridge portions are t...

  20. Accelerated bridge paint test program.

    DOT National Transportation Integrated Search

    2011-07-06

    The accelerated bridge paint (AB-Paint) program evaluated a new Sherwin-Williams two-coat, : fast-curing paint system. The system is comprised of an organic zinc-rich primer (SW Corothane I : Galvapac One-Pack Zinc-Rich Primer B65 G11) and a polyurea...

  1. Seismic response of precast segmental bridge superstructures.

    DOT National Transportation Integrated Search

    2006-12-01

    Precast segmental construction of bridges can accelerate construction and minimize the cost of bridges in highly congested urban environments and environmentally sensitive regions. Despite their proven benefits, the use of precast segmental bridges i...

  2. Accelerated construction

    DOT National Transportation Integrated Search

    2004-01-01

    Accelerated Construction Technology Transfer (ACTT) is a strategic process that uses various innovative techniques, strategies, and technologies to minimize actual construction time, while enhancing quality and safety on today's large, complex multip...

  3. Faster bridge construction using precast substructures : brief.

    DOT National Transportation Integrated Search

    2011-07-01

    Bridge replacement often requires road closures and detours that frustrate road users. It remains a key goal of Wisconsin DOT to reduce construction-related road use interruptions. This will be a challenge with bridges: Bridge inspections in 2007 ide...

  4. Construction of crack-free bridge decks.

    DOT National Transportation Integrated Search

    2017-04-01

    This serves as the final report on Transportation Pooled-Fund Program Project No. TPF-5(174), Construction : of Crack-Free Bridge Decks. The goal of the study was to implement the most cost-effective techniques for : improving bridge deck life ...

  5. 76 FR 55160 - Annual Materials Report on New Bridge Construction and Bridge Rehabilitation

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-06

    ... DEPARTMENT OF TRANSPORTATION Federal Highway Administration Annual Materials Report on New Bridge Construction and Bridge Rehabilitation AGENCY: Federal Highway Administration (FHWA), DOT. ACTION: Notice... for Users (SAFETEA-LU) (Pub. L. 109-59; 119 Stat. 1144) continued the highway bridge program to enable...

  6. 77 FR 53251 - Annual Materials Report on New Bridge Construction and Bridge Rehabilitation

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-31

    ... DEPARTMENT OF TRANSPORTATION Federal Highway Administration Annual Materials Report on New Bridge Construction and Bridge Rehabilitation AGENCY: Federal Highway Administration (FHWA), DOT. ACTION: Notice... for Users (SAFETEA-LU) (Pub. L. 109-59; 119 Stat. 1144) continued the highway bridge program to enable...

  7. 75 FR 62181 - Annual Materials Report on New Bridge Construction and Bridge Rehabilitation

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-07

    ... DEPARTMENT OF TRANSPORTATION Federal Highway Administration Annual Materials Report on New Bridge Construction and Bridge Rehabilitation AGENCY: Federal Highway Administration (FHWA), DOT. ACTION: Notice... for Users (SAFETEA-LU) (Pub. L. 109-59; 119 Stat. 1144) continued the highway bridge program to enable...

  8. Phase and widening construction of steel bridges.

    DOT National Transportation Integrated Search

    2014-03-01

    Phase construction is used to maintain traffic without interruption and generally refers to sequenced construction where a portion of the bridge is under construction while the remainder continues to carry traffic. The method typically results in two...

  9. Bridging the gap between high and low acceleration for planetary escape

    NASA Astrophysics Data System (ADS)

    Indrikis, Janis; Preble, Jeffrey C.

    With the exception of the often time consuming analysis by numerical optimization, no single orbit transfer analysis technique exists that can be applied over a wide range of accelerations. Using the simple planetary escape (parabolic trajectory) mission some of the more common techniques are considered as the limiting bastions at the high and the extremely low acceleration regimes. The brachistochrone, the minimum time of flight path, is proposed as the technique to bridge the gap between the high and low acceleration regions, providing a smooth bridge over the entire acceleration spectrum. A smooth and continuous velocity requirement is established for the planetary escape mission. By using these results, it becomes possible to determine the effect of finite accelerations on mission performance and target propulsion and power system designs which are consistent with a desired mission objective.

  10. 35. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    35. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main St., Columbus Bridge under construction, 1925-27. Photo from S side of W approach. Credit: Shenks Photography, Columbus, Ms, owner. O. Pruitt, photographer, ca. 1927. Copied by Sarcone Photography, columbus, Ms. Sep 1978. - Bridges of the Upper Tombigbee River Valley, Columbus, Lowndes County, MS

  11. 12. Photocopy of bridge construction phonograph (from the collection of ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. Photocopy of bridge construction phonograph (from the collection of Phil Bolmie, 17540 County Road 28, Colfax, North Dakota 58018; 701 553-8705) photographer unknown, 1917 views showing bridge under construction - Enloe Bridge No. 90021, Spanning Red River of North between Minnesota & North Dakota on County State Aid Highway 28, Wolverton, Wilkin County, MN

  12. Recovering bridge deflections from collocated acceleration and strain measurements

    NASA Astrophysics Data System (ADS)

    Bell, M.; Ma, T. W.; Xu, N. S.

    2015-04-01

    In this research, an internal model based method is proposed to estimate the displacement profile of a bridge subjected to a moving traffic load using a combination of acceleration and strain measurements. The structural response is assumed to be within the linear range. The deflection profile is assumed to be dominated by the fundamental mode of the bridge, therefore only requiring knowledge of the first mode. This still holds true under a multiple vehicle loading situation as the high mode shapes don't impact the over all response of the structure. Using the structural modal parameters and partial knowledge of the moving vehicle load, the internal models of the structure and the moving load can be respectively established, which can be used to form an autonomous state-space representation of the system. The structural displacements, velocities, and accelerations are the states of such a system, and it is fully observable when the measured output contains structural accelerations and strains. Reliable estimates of structural displacements are obtained using the standard Kalman filtering technique. The effectiveness and robustness of the proposed method has been demonstrated and evaluated via numerical simulation of a simply supported single span concrete bridge subjected to a moving traffic load.

  13. Structural characterization of UHPC waffle bridge deck and connections.

    DOT National Transportation Integrated Search

    2014-07-01

    The AASHTO strategic plan in 2005 for bridge engineering identified extending the service life of bridges and accelerating bridge : construction as two of the grand challenges in bridge engineering. These challenges have the objective of producing sa...

  14. Implementation of sustainability in bridge design, construction and maintenance.

    DOT National Transportation Integrated Search

    2012-12-01

    The focus of this research is to develop a framework for more sustainable design and construction : processes for new bridges, and sustainable maintenance practices for existing bridges. The framework : includes a green rating system for bridges. The...

  15. Durability assessment of prefabricated bridge elements and systems : [research summary].

    DOT National Transportation Integrated Search

    2015-08-01

    Many states have instituted Prefabricated Bridge Elements and Systems : (PBES) and Accelerated Bridge Construction (ABC) projects to decrease : onsite construction time, work zone and user costs, and increase safety : factors; however, the quality an...

  16. 33 CFR 115.60 - Procedures for handling applications for bridge construction permits.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... applications for bridge construction permits. 115.60 Section 115.60 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES BRIDGE LOCATIONS AND CLEARANCES; ADMINISTRATIVE PROCEDURES § 115.60 Procedures for handling applications for bridge construction permits. The following procedures will be...

  17. 33 CFR 115.60 - Procedures for handling applications for bridge construction permits.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... applications for bridge construction permits. 115.60 Section 115.60 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES BRIDGE LOCATIONS AND CLEARANCES; ADMINISTRATIVE PROCEDURES § 115.60 Procedures for handling applications for bridge construction permits. The following procedures will be...

  18. Analysis of the state of the art of precast concrete bridge substructure systems.

    DOT National Transportation Integrated Search

    2013-10-01

    Precasting of bridge substructure components holds potential for accelerating the construction of bridges,reducing : impacts to the traveling public on routes adjacent to construction sites, improving bridge durability and hence service : life, and r...

  19. Elkmont Vehicle Bridge, Construction PeelAway Great Smoky Mountains National ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Elkmont Vehicle Bridge, Construction Peel-Away - Great Smoky Mountains National Park Roads & Bridges, Elkmont Vehicle Bridge, Spanning Little River at Elkmont Campground, Gatlinburg, Sevier County, TN

  20. Construction of crack-free bridge decks : technical summary.

    DOT National Transportation Integrated Search

    2017-04-01

    The report documents the performance of the decks based on crack surveys performed on the LC-HPC decks and : matching control bridge decks. The specifications for LC-HPC bridge decks, which cover aggregates, concrete, : and construction procedures, a...

  1. A novel abutment construction technique for rapid bridge construction : controlled low strength Materials (CLSM) with full-height concrete panels.

    DOT National Transportation Integrated Search

    2012-01-01

    One of the major obstacles facing rapid bridge construction for typical span type bridges is the time required to construct bridge abutments and foundations. This can be remedied by using the controlled low strength materials (CLSM) bridge abutment. ...

  2. Construction Simulation Analysis of 60m-span Concrete Filled Steel Tube arch bridge

    NASA Astrophysics Data System (ADS)

    Shi, Jing Xian; Ding, Qing Hua

    2018-06-01

    The construction process of the CFST arch bridge is complicated. The construction process not only affects the structural stress in the installation, but also determines the form a bridge and internal force of the bridge. In this paper, a 60m span concrete filled steel tube tied arch bridge is taken as the background, and a three-dimensional finite element simulation model is established by using the MIDAS/Civil bridge structure analysis software. The elevation of the main arch ring, the beam stress, the forces in hanger rods and the modal frequency of the main arch during the construction stage are calculated, and the construction process is simulated and analyzed. Effectively and reasonably guide the construction and ensure that the line and force conditions of the completed bridge meet the design requirements and provides a reliable technical guarantee for the safe construction of the bridge.

  3. Monitoring of a concrete arch bridge during construction

    NASA Astrophysics Data System (ADS)

    Inaudi, Daniele; Ruefenacht, A.; von Arx, B.; Noher, H. P.; Vurpillot, Samuel; Glisic, Branko

    2002-06-01

    The Siggenthal Bridge is a concrete arch bridge with an arch span of 117 m, being built over the Limmat River in Baden, Switzerland. This bridge has been instrumented with 58 long- gage SOFO fiber optic deformation sensors, 2 inclinometers and 8 temperature sensors to monitor its deformations, curvatures and displacements during construction and int eh long-term. The sensor have been built installed successfully and the arch was monitored during the removal of the formwork and supports. It was therefore possible to observe the deformations of the arch wen being loaded by its dead load and by the daily temperature fluctuations. The measurements have shown that the temperature changes produce deformations of the same order of magnitude as the dead loads. The out-of-plain displacements obtained by double- integration of the measured curvatures are in good agreement with the direct triangulation measurements. Monitoring was also carried out during the construction of the superstructure, with the associated change of the load distribution in the arch. This paper briefly introduces the functional principle of the long-gage sensors used in this application, illustrates their installation and discusses the measurement results obtained during the bridge construction.

  4. UNIDENTIFIED CATENARY SUSPENSION BRIDGE, SHOWING RIVETED METAL PIERS UNDER CONSTRUCTION. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    UNIDENTIFIED CATENARY SUSPENSION BRIDGE, SHOWING RIVETED METAL PIERS UNDER CONSTRUCTION. NOTE APPROACH SPANS OF PIPE CONSTRUCTION IN RIGHT BACKGROUND. 3/4 VIEW FROM BELOW. - Clear Fork of Brazos River Suspension Bridge, Spanning Clear Fork of Brazos River at County Route 179, Albany, Shackelford County, TX

  5. Laboratory testing and finite element modeling of precast bridge deck panel transverse connections.

    DOT National Transportation Integrated Search

    2010-08-06

    Precast bridge deck panels are increasingly used to reduce construction times and associated traffic delays as part of many DOTs push for accelerated bridge construction. They allow a bridge deck to be built or replaced in days instead of months. ...

  6. Improving bridges with prefabricated precast concrete systems.

    DOT National Transportation Integrated Search

    2013-12-01

    In order to minimize the impact of construction on the traveling public, MDOT utilizes innovative and specialized construction methods such as Accelerated Bridge Construction (ABC). Michigan, like other highway agencies in the region, has several cha...

  7. Seismic retrofit of spliced sleeve connections for precast bridge piers.

    DOT National Transportation Integrated Search

    2017-03-01

    Grouted Splice Sleeve (GSS) connectors are being considered for connecting bridge columns, footings, and pier caps in Accelerated Bridge Construction (ABC). A repair technique for precast reinforced concrete bridge column-to-footing and column-to-pie...

  8. 76 FR 65376 - Regulated Navigation Area; Chelsea Street Bridge Construction, Chelsea, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-21

    ...-AA11 Regulated Navigation Area; Chelsea Street Bridge Construction, Chelsea, MA AGENCY: Coast Guard... Area (RNA) on the navigable waters of the Chelsea River under and surrounding the Chelsea Street Bridge... opportunity for public questions or comments, during the bridge construction. We will provide written...

  9. 76 FR 42545 - Regulated Navigation Area; Chelsea Street Bridge Construction, Chelsea, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-19

    ...-AA11 Regulated Navigation Area; Chelsea Street Bridge Construction, Chelsea, MA AGENCY: Coast Guard... and surrounding the Chelsea Street Bridge (CSB) that crosses the Chelsea River between East Boston and... navigable waters during the construction of the Chelsea Street Bridge. DATES: This rule is effective in the...

  10. 75 FR 38923 - Regulated Navigation Area: Niantic Railroad Bridge Construction, Niantic, CT

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-07

    ...-AA11 Regulated Navigation Area: Niantic Railroad Bridge Construction, Niantic, CT AGENCY: Coast Guard... Niantic River Channel under and surrounding the Amtrak Railroad Bridge that crosses Niantic Bay in the... on the navigable waters during the construction of the Niantic Railroad Bridge. DATES: This rule is...

  11. Durability assessment of prefabricated bridge elements and systems.

    DOT National Transportation Integrated Search

    2015-02-01

    This study aims to address some of the concerns related to implementation of prefabricated bridge elements and systems (PBES) : and accelerated bridge construction (ABC) in Maryland, where some barriers included assessment of the quality and durabili...

  12. 77 FR 20719 - Safety Zone; Matlacha Bridge Construction, Matlacha Pass, Matlacha, FL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-06

    ...-AA00 Safety Zone; Matlacha Bridge Construction, Matlacha Pass, Matlacha, FL AGENCY: Coast Guard, DHS... waters of Matlacha Pass in the vicinity of the Matlacha Bridge in Matlacha, Florida. The safety zone will be enforced during construction of the Matlacha Bridge from Monday, March 12, 2012 through Tuesday...

  13. 77 FR 1870 - Safety Zone; Matlacha Bridge Construction, Matlacha Pass, Matlacha, FL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-12

    ...-AA00 Safety Zone; Matlacha Bridge Construction, Matlacha Pass, Matlacha, FL AGENCY: Coast Guard, DHS... waters of Matlacha Pass in the vicinity of the Matlacha Bridge in Matlacha, Florida. The safety zone will be enforced during construction of the Matlacha Bridge from Thursday, December 15, 2011 until Sunday...

  14. 37. MISSISSIPPI, LOWNDES CO. COLUMBUS BRIDGE, CONSTRUCTION End of Main ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    37. MISSISSIPPI, LOWNDES CO. COLUMBUS BRIDGE, CONSTRUCTION End of Main St., Columbus Overhead view of round, swing pier, showing steel reinforcing rods, workmen. During construction, 1925-27. Credit: Shenks Photography, Columbus, Ms, owner. O. Pruitt, photographer, ca. 1926. Sarcone Photography, Columbus, Ms. Sep 1978. - Bridges of the Upper Tombigbee River Valley, Columbus, Lowndes County, MS

  15. Bridge deck fogging system : evaluation of field implementation of a fogging system used during bridge deck construction.

    DOT National Transportation Integrated Search

    2008-01-01

    The objective of this research was to implement and evaluate a fogging system used to provide initial cure for a concrete bridge deck construction project. To accomplish this, Bridges 5500 and 5701 along NM26 were selected. Bridge 5500 was placed usi...

  16. Construction of prestressed concrete single-tee bridge superstructures.

    DOT National Transportation Integrated Search

    1977-01-01

    This report discusses in detail the construction of the first five precast, prestressed concrete, single-tee beam bridge superstructures to be let to contract in Virginia. The data suggest that this single-tee beam enables efficient construction of t...

  17. 32. BRIDGE, CONSTRUCTION Tombigbee R. MISSISSIPPI, LOWNDES CO. COLUMBUS End ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. BRIDGE, CONSTRUCTION Tombigbee R. MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main St., Columbus Center and east pier, with framing, during construction, 1925-27. Makes panorama with next photo. Note steam crane on framing. Credit: Shenks Photography, Columbus, MS, owner. O. Pruitt, photographer. Copied by Sarcone Photography, Columbus, Ms. Sep 1978. - Bridges of the Upper Tombigbee River Valley, Columbus, Lowndes County, MS

  18. Implementation of sustainable and green design and construction practices for bridges.

    DOT National Transportation Integrated Search

    2012-12-01

    The focus of this research is to develop a framework for more sustainable design and construction : processes for new bridges, and sustainable maintenance practices for existing bridges. The framework : includes a green rating system for bridges. The...

  19. TOPOGRAPHIC VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    TOPOGRAPHIC VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW TO SOUTHEAST. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  20. ELEVATION VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    ELEVATION VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW TO NORTH. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  1. Laboratory investigation of grouted coupler connection details for ABC bridge projects.

    DOT National Transportation Integrated Search

    2015-08-01

    With an ever increasing desire to utilize accelerated bridge construction (ABC) techniques, it is becoming critical that bridge : designers and contractors have confidence in typical details. The Keg Creek Bridge on US 6 in Iowa was a recent ABC exam...

  2. Geometry control of long-span continuous girder concrete bridge during construction through finite element model updating

    NASA Astrophysics Data System (ADS)

    Wu, Jie; Yan, Quan-sheng; Li, Jian; Hu, Min-yi

    2016-04-01

    In bridge construction, geometry control is critical to ensure that the final constructed bridge has the consistent shape as design. A common method is by predicting the deflections of the bridge during each construction phase through the associated finite element models. Therefore, the cambers of the bridge during different construction phases can be determined beforehand. These finite element models are mostly based on the design drawings and nominal material properties. However, the accuracy of these bridge models can be large due to significant uncertainties of the actual properties of the materials used in construction. Therefore, the predicted cambers may not be accurate to ensure agreement of bridge geometry with design, especially for long-span bridges. In this paper, an improved geometry control method is described, which incorporates finite element (FE) model updating during the construction process based on measured bridge deflections. A method based on the Kriging model and Latin hypercube sampling is proposed to perform the FE model updating due to its simplicity and efficiency. The proposed method has been applied to a long-span continuous girder concrete bridge during its construction. Results show that the method is effective in reducing construction error and ensuring the accuracy of the geometry of the final constructed bridge.

  3. 34. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main St., Columbus Date: 1925-27. Old bridge in background. Photo taken from such (probably east) bank. Credit: Shenks Photography, Columbus, Ms, owner. O. Pruitt, photographer, ca. 1927. Copied by Sarcone Photography, Columbus, Ms. Sep 1978. - Bridges of the Upper Tombigbee River Valley, Columbus, Lowndes County, MS

  4. PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW TO NORTH ON WEST SIDE. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  5. Determination of brace forces caused by construction loads and wind loads during bridge construction.

    DOT National Transportation Integrated Search

    2014-04-01

    The first objective of this study was to develop procedures for determining bracing forces during bridge construction. : Numerical finite element models and analysis techniques were developed for evaluating brace forces induced by construction loads ...

  6. Cost and Ecological Feasibility of using UHPC in Highway Bridges

    DOT National Transportation Integrated Search

    2017-11-15

    There is a growing interest in expanding the use of Ultra-high performance concrete (UHPC) from bridge deck joints for accelerated bridge construction to complex architectural and advanced structural applications. The high costs currently associated ...

  7. 34. Photographic copy of original construction plan (Wabasha Street Bridge, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. Photographic copy of original construction plan (Wabasha Street Bridge, Cantilever Span 1888); web details of cantilever arm connecting first span to first pier - Wabasha Street Bridge, Spanning Mississippi River at Wabasha Street, Saint Paul, Ramsey County, MN

  8. 48. Photographic copy of original construction plan (Wabasha St. Bridge, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    48. Photographic copy of original construction plan (Wabasha St. Bridge, Plan of Masonry for Abutment, Piers No. 1 and 3, 1888); North abutment, first and second piers - Wabasha Street Bridge, Spanning Mississippi River at Wabasha Street, Saint Paul, Ramsey County, MN

  9. ELEVATION VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    ELEVATION VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW OF NORTH ARCH FOLLOWING REMOVAL OF TRAVELING FORMWORK, VIEW TO EAST. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  10. PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW OF SOUTH TRAVELING FORMWORK AND NORTH ARCH PRIOR TO CLOSURE POUR. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  11. PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    PERSPECTIVE VIEW OF THE REX T. BARBER BRIDGE ARCH CONSTRUCTION, VIEW TO SOUTH OF SOUTHERN TRAVELING FORMWORK AND CABLE STAY TOWER. - Rex T. Barber Veterans Memorial Bridge, Spanning Crooked River Gorge, Dalles-California Highway (US 97), Terrebonne, Deschutes County, OR

  12. 38. Photographic copy of original construction plan (Wabasha Street Bridge, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    38. Photographic copy of original construction plan (Wabasha Street Bridge, Detail of South Cantilever Arm, 1888); web details of cantilever arm connecting second pier to third span - Wabasha Street Bridge, Spanning Mississippi River at Wabasha Street, Saint Paul, Ramsey County, MN

  13. A literature survey on industrialized bridge construction.

    DOT National Transportation Integrated Search

    1972-01-01

    The purpose of this survey was to aid the writer in understanding and retaining material in preparation for a project on the industrialization of bridge construction. However, it was believed that the results of the survey would be informative to oth...

  14. Evaluating Louisiana new deck continuity detail for precast prestressed concrete girder bridges : research project capsule.

    DOT National Transportation Integrated Search

    2014-08-01

    The goal of everyone in the transportation community is to build bridges : that are economic, easy to construct, and durable. Therefore, accelerating : bridge construction through the use of precast concrete or prefabricated : steel girders is a comm...

  15. 75 FR 22228 - Regulated Navigation Area; Lake Champlain Bridge Construction Zone, NY and VT

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-28

    ...-AA11 Regulated Navigation Area; Lake Champlain Bridge Construction Zone, NY and VT AGENCY: Coast Guard... establishing a regulated navigation area around the construction zone of the Lake Champlain Bridge between... on all vessels transiting the navigable waters of Lake Champlain in the vicinity of the bridge...

  16. 77 FR 14276 - Regulated Navigation Area; Little Bay Bridge Construction, Little Bay, Portsmouth, NH

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-09

    ...-AA11 Regulated Navigation Area; Little Bay Bridge Construction, Little Bay, Portsmouth, NH AGENCY... under and surrounding the Little Bay and General Sullivan Bridges in order to facilitate construction of the Little Bay Bridge between Newington, NH and Dover, NH. This temporary interim rule is necessary to...

  17. 76 FR 57910 - Regulated Navigation Area; Route 24 Bridge Construction, Tiverton and Portsmouth, RI

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-19

    ...-AA11 Regulated Navigation Area; Route 24 Bridge Construction, Tiverton and Portsmouth, RI AGENCY: Coast... surrounding construction of the new Route 24 bridge that crosses the Sakonnet River between Tiverton and... channel beneath the bridge, speed restrictions, and suspension of all vessel traffic within the RNA during...

  18. Effect of voids in grouted, post-tensioned concrete bridge construction : seminar slides.

    DOT National Transportation Integrated Search

    2009-02-26

    Post-tensioned (PT) bridges have several advantages over other bridge types: they can span longer distances, can be constructed relatively fast, and are economical. The tendons of PT bridges are critical components, essentially the backbone of the PT...

  19. Effects of bridge construction on songbirds and small mammals at Blennerhassett Island, Ohio River, USA.

    PubMed

    Vance, Joshua A; Angus, Norse B; Anderson, James T

    2013-09-01

    Construction of man-made objects such as roads and bridges may have impacts on wildlife depending on species or location. We investigated songbirds and small mammals along the Ohio River, WV, USA at a new bridge both before and after construction and at a bridge crossing that was present throughout the study. Comparisons were made at each site over three time periods (1985-1987 [Phase I] and 1998-2000 [Phase II] [pre-construction], 2007-2009 [Phase III] [post-construction]) and at three distances (0, 100, 300 m) from the bridge or proposed bridge location. Overall, 70 songbirds and 10 small mammals were detected during the study. Cliff swallows (Petrochelidon pyrrhonota) and rock pigeons (Columba livia) showed high affinity for bridges (P < 0.05). Combined small mammal abundances increased between Phases I and II (P < 0.05), but did not differ between Phases II and III (P > 0.05). Species richness and diversity for songbirds and small mammals did not differ before and after bridge construction (P > 0.05). We found that most species sampled did not respond to the bridge crossing, and believe that the bridge is not causing any measurable negative density impacts to the species we investigated. The new bridge does provide habitat for exotic rock pigeons that are adjusted to man-made structures for nesting.

  20. 78 FR 37969 - Safety Zone; South Park Bridge Construction, Lower Duwamish Waterway, Seattle, WA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-25

    ...-AA00 Safety Zone; South Park Bridge Construction, Lower Duwamish Waterway, Seattle, WA AGENCY: Coast... zone in the lower Duwamish Waterway around the South Park Bridge in Seattle, Washington for the re-construction of the bridge. The safety zone is necessary to ensure the safety of the maritime public and...

  1. 77 FR 70891 - Safety Zone; Bay Bridge Construction, San Francisco Bay, San Francisco, CA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-28

    ...-AA00 Safety Zone; Bay Bridge Construction, San Francisco Bay, San Francisco, CA AGENCY: Coast Guard... the navigable waters of the San Francisco Bay near Yerba Buena Island, CA in support of the Bay Bridge... construction of the Bay Bridge, the safety zone is necessary to provide for the safety of mariners transiting...

  2. Research on Swivel Construction Technology of 22,400 Tons in Zoucheng Thirty Meter Bridge

    NASA Astrophysics Data System (ADS)

    Han, Jun; Benlin, Xiao

    2018-05-01

    In recent years, with the rapid development of highways and railways in our country, there have been many new bridges that need to cross the existing routes. If the conventional construction methods are used, the existing traffic will be affected and the traffic will be built above the busy traffic lines, so there is a big security risk, the construction methods must be improved and innovated. In this paper, it intends to research and develop some key technologies of swivel construction. According to the construction features to use finite element method of swivel cable-stayed bridge to analyse the cable-stayed bridge . The swivel construction process is carried out to solve the technical problems and difficulties in the construction.

  3. The future of rapid bridge deck replacement.

    DOT National Transportation Integrated Search

    2015-06-01

    Replacing aging, deteriorated infrastructure often requires road closures and traffic detours which impose : inconvenience and delay on commerce and members of the motoring public. Accelerated bridge construction : techniques often use precast member...

  4. Investigation of techniques for accelerating the construction of bridge deck overlays : tech transfer summary.

    DOT National Transportation Integrated Search

    2016-04-01

    Todays environment is increasingly hostile to bridge decks with exposure : to deicing salts and environmental factors such as large temperature swings : and polluting chemicals. Being subjected to the most severe loading of all the : bridge compon...

  5. Construction machine control guidance implementation strategy.

    DOT National Transportation Integrated Search

    2010-07-01

    Machine Controlled Guidance (MCG) technology may be used in roadway and bridge construction to improve construction efficiencies, potentially resulting in reduced project costs and accelerated schedules. The technology utilizes a Global Positioning S...

  6. 33. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    33. BRIDGE, CONSTRUCTION MISSISSIPPI, LOWNDES CO. COLUMBUS End of Main St., Columbus Center and east pier, with framing, makes panorama with preceding photo. Date: 1925-27. Credit: Shenks Photographi, Columbus, Ms. owner. O. Pruitt, photographer, ca. 1926 Copied by Sarcone Photography, Columbus, Ms. Sep 1978. - Bridges of the Upper Tombigbee River Valley, Columbus, Lowndes County, MS

  7. Design, construction, and field testing of an ultra high performance concrete pi-girder bridge.

    DOT National Transportation Integrated Search

    2011-01-01

    The Jakway Park Bridge in Buchanan County, Iowa is the first bridge constructed with a new prestesssed girder system composed of : precast Ultra-High Performance Concrete (UHPC). These girders employ an integral deck to facilitate construction and ar...

  8. Construction simulation analysis of 120m continuous rigid frame bridge based on Midas Civil

    NASA Astrophysics Data System (ADS)

    Shi, Jing-xian; Ran, Zhi-hong

    2018-03-01

    In this paper, a three-dimensional finite element model of a continuous rigid frame bridge with a main span of 120m is established by the simulation and analysis of Midas Civil software. The deflection and stress of the main beam in each construction stage of continuous beam bridge are simulated and analyzed, which provides a reliable technical guarantee for the safe construction of the bridge.

  9. Finite Element Analysis and Biomechanical Comparison of Short Posterior Spinal Instrumentation with Divergent Bridge Construct versus Parallel Tension Band Construct for Thoracolumbar Spine Fractures

    PubMed Central

    Ouellet, Jean A.; Richards, Corey; Sardar, Zeeshan M.; Giannitsios, Demetri; Noiseux, Nicholas; Strydom, Willem S.; Reindl, Rudy; Jarzem, Peter; Arlet, Vincent; Steffen, Thomas

    2013-01-01

    The ideal treatment for unstable thoracolumbar fractures remains controversial with posterior reduction and stabilization, anterior reduction and stabilization, combined posterior and anterior reduction and stabilization, and even nonoperative management advocated. Short segment posterior osteosynthesis of these fractures has less comorbidities compared with the other operative approaches but settles into kyphosis over time. Biomechanical comparison of the divergent bridge construct versus the parallel tension band construct was performed for anteriorly destabilized T11–L1 spine segments using three different models: (1) finite element analysis (FEA), (2) a synthetic model, and (3) a human cadaveric model. Outcomes measured were construct stiffness and ultimate failure load. Our objective was to determine if the divergent pedicle screw bridge construct would provide more resistance to kyphotic deforming forces. All three modalities showed greater stiffness with the divergent bridge construct. The FEA calculated a stiffness of 21.6 N/m for the tension band construct versus 34.1 N/m for the divergent bridge construct. The synthetic model resulted in a mean stiffness of 17.3 N/m for parallel tension band versus 20.6 N/m for the divergent bridge (p = 0.03), whereas the cadaveric model had an average stiffness of 15.2 N/m in the parallel tension band compared with 18.4 N/m for the divergent bridge (p = 0.02). Ultimate failure load with the cadaveric model was found to be 622 N for the divergent bridge construct versus 419 N (p = 0.15) for the parallel tension band construct. This study confirms our clinical experience that the short posterior divergent bridge construct provides greater stiffness for the management of unstable thoracolumbar fractures. PMID:24436856

  10. Effect of voids in grouted post-tensioned concrete bridge construction : inspection and repair manual for external tendons in segmental, post-tensioned bridges.

    DOT National Transportation Integrated Search

    2009-11-01

    Segmental, post-tensioned (PT) bridges are major structures that carry significant traffic. These bridges are designed and constructed because they are economical for spanning long distances. In Texas, there are several signature PT bridges. In the l...

  11. 77 FR 1407 - Regulated Navigation Area; Memorial Bridge Construction, Piscataqua River, Portsmouth, NH

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-10

    ...-AA11 Regulated Navigation Area; Memorial Bridge Construction, Piscataqua River, Portsmouth, NH AGENCY... River under and surrounding the Memorial Bridge between Portsmouth, NH and Kittery, ME. This temporary interim rule is necessary to provide for the safety of life on the navigable waters during bridge...

  12. M324 : investigation of closure pour elimination for phased construction of steel girder bridges.

    DOT National Transportation Integrated Search

    2014-10-01

    Phased construction is a common practice used by State DOTs during the : replacement of a bridge. This method allows for the traffic flow to be maintained on half : of the bridge while a new deck is constructed on the other half. For steel girder bri...

  13. 1857 PatentExtant Construction Comparison Powerscourt Bridge, Spanning Chateauguay River, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1857 Patent-Extant Construction Comparison - Powerscourt Bridge, Spanning Chateauguay River, First Concession Road, Elgin/Hichinbrooke, Huntingdon County, Quebec, Canada, Chateaugay, Franklin County, NY

  14. 78 FR 71546 - Safety Zone; Belt Parkway Bridge Construction, Gerritsen Inlet, Brooklyn, NY

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-29

    ... 1625-AA00 Safety Zone; Belt Parkway Bridge Construction, Gerritsen Inlet, Brooklyn, NY AGENCY: Coast... safety zone on the navigable waters of Gerritsen Inlet surrounding the Belt Parkway Bridge. This proposed rule would allow the Coast Guard to prohibit all vessel traffic through the safety zone during bridge...

  15. 75 FR 21990 - Safety Zone; Extended Debris Removal in the Lake Champlain Bridge Construction Zone (Between...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-27

    ...-AA00 Safety Zone; Extended Debris Removal in the Lake Champlain Bridge Construction Zone (Between... surrounding the Lake Champlain Bridge construction zone between Chimney Point, VT and Crown Point, NY. This... of debris from the old Crown Point bridge demolition. The debris must be cleared from the navigable...

  16. Long-term behavior of integral abutment bridges : appendix A, construction plans.

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand thei...

  17. Caisson disease during the construction of the Eads and Brooklyn Bridges: A review.

    PubMed

    Butler, W P

    2004-01-01

    The Eads Bridge (St. Louis) and the Brooklyn Bridge (New York City) were testing grounds for caisson construction. These caissons were enormous compressed air boxes used to build riverine piers and abutments anchoring the bridges. Caisson meant faster and cheaper construction, but there was a hidden cost---caisson disease (decompression sickness). Within caissons, workers labored at pressures as high as 55 psig and caisson disease was common. This discourse is a brief history of the caisson, a brief discussion of the illness as viewed in the mid 1800's, and an abbreviated history of the Eads and Brooklyn Bridges. It also provides a detailed description and evaluation of the observations, countermeasures, and recommendations of Dr. Alphonse Jaminet, the Eads Bridge physician, and Dr. Andrew Smith, the Brooklyn Bridge physician, who published reports of their experience in 1871 and 1873, respectively. These and other primary sources permit a detailed examination of early caisson disease and Jaminet's and Smith's thinking also serve as good examples from which to study and learn.

  18. 19 CFR 123.18 - Equipment and materials for constructing bridges or tunnels between the United States and Canada...

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 19 Customs Duties 1 2011-04-01 2011-04-01 false Equipment and materials for constructing bridges... WITH CANADA AND MEXICO International Traffic § 123.18 Equipment and materials for constructing bridges.... Equipment for use in construction of bridges or tunnels between the United States and Canada or Mexico shall...

  19. An industrialized construction approach to concrete superstructures for bridges.

    DOT National Transportation Integrated Search

    1974-01-01

    The objective of this study was to develop drawings for a specific site or sites that incorporated the best concepts of industrialized bridge superstructure construction, that is, great emphasis was placed upon the use of modular design and assembly ...

  20. Research on construction technology for orthotropic steel deck pavement of Haihe River Chunyi Bridge

    NASA Astrophysics Data System (ADS)

    Xue, Y. C.; Qian, Z. D.; Zhang, M.

    2017-01-01

    In order to ensure the good service quality of orthotropic steel deck pavement of Haihe River Chunyi Bridge in Tianjin, and to reduce the occurrence of pavement diseases like lateral and longitudinal cracks, the key working procedures such as steel deck cleaning, anticorrosive coating, bonding layer spraying, seam cutting, epoxy asphalt concrete’s mixing, transportation, paving and compaction were studied. The study was based on the main features of epoxy asphalt concrete which is the pavement materials of Haihe River Chunyi Bridge, and combined with the basic characteristics and construction conditions of Haihe River Chunyi Bridge. Furthermore, some processing measures like controlling time and temperature, continuous paving with two pavers, lateral feeding, and improving the compaction method were proposed. The project example shows that the processing measures can effectively solve the technical difficulties in the construction of orthotropic steel deck pavement of Haihe River Chunyi Bridge, can greatly improve the construction speed and quality, and can provide reference for the same kinds of orthotropic steel deck pavement construction.

  1. Construction of bridge decks with precast prestressed deck planks

    DOT National Transportation Integrated Search

    2002-04-01

    The purpose of this paper is to discuss the construction and early performance of two 1999 - 2000 bridge deck replacement state contracts in Illinois that included precast, prestressed concrete (PPC) deck planks. Metal stay-in-place forms used in one...

  2. Development and validation of a sensor-based health monitoring model for the Parkview Bridge deck.

    DOT National Transportation Integrated Search

    2012-01-31

    Accelerated bridge construction (ABC) using full-depth precast deck panels is an innovative technique that brings all : the benefits listed under ABC to full fruition. However, this technique needs to be evaluated and the performance of : the bridge ...

  3. Determination of brace forces caused by construction loads and wind loads during bridge construction : [summary].

    DOT National Transportation Integrated Search

    2014-04-01

    Bridges are constructed in stages as pilings, : columns, girders, decks, and other components : are added. At each stage, the structure must be : stable. Girders, which add significant weight to : the developing structure, rest on elastomeric : beari...

  4. Laboratory and field testing of an accelerated bridge construction demonstration bridge : US Highway 6 bridge over Keg Creek : tech transfer summary.

    DOT National Transportation Integrated Search

    2013-04-01

    To address the need for the development of a fast, repeatable, and dependable way to replace typical bridges across the country, the Transportation Research Board (TRB) developed project R04, Innovative Designs for Rapid Renewal, as part of the...

  5. 33 CFR 165.T01-0176 - Regulated Navigation Area; Lake Champlain Bridge Construction, Crown Point, New York and Chimney...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Champlain Bridge Construction, Crown Point, New York and Chimney Point, Vermont. 165.T01-0176 Section 165...; Lake Champlain Bridge Construction, Crown Point, New York and Chimney Point, Vermont. (a) Description... and south of the Lake Champlain Bridge construction zone at Crown Point, New York and Chimney Point...

  6. Laboratory investigation of grouted coupler connection details for ABC bridge projects : [tech transfer summary].

    DOT National Transportation Integrated Search

    2015-08-01

    Advancements and increased use of accelerated bridge construction (ABC) : often result in the use of newly developed, or modified, technologies and/or : construction techniques that are sometimes untested in this new application. : For designers and ...

  7. Development and validation of a sensor-based health monitoring model for the Parkview Bridge deck : [appendices].

    DOT National Transportation Integrated Search

    2012-01-31

    Accelerated bridge construction (ABC) using full-depth precast deck panels is an innovative technique that brings all the benefits listed under ABC to full fruition. However, this technique needs to be evaluated and the performance of the bridge need...

  8. Construction of a Virginia short-span bridge with the Strongwell 36-inch double-web I-beam.

    DOT National Transportation Integrated Search

    2005-01-01

    The Route 601 Bridge in Sugar Grove, VA, spans 39 ft over Dickey Creek. The bridge is the first to use the Strongwell 36-in-deep fiber-reinforced polymer (FRP) double-web beam (DWB) in a vehicular bridge superstructure. Construction of the new bridge...

  9. 78 FR 59237 - Regulated Navigation Area-Weymouth Fore River, Fore River Bridge Construction, Weymouth and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-26

    ...-AA11 Regulated Navigation Area--Weymouth Fore River, Fore River Bridge Construction, Weymouth and... vicinity of the Fore River Bridge (Mile 3.5) between Weymouth and Quincy, MA. This rule will place temporary speed, wake, and entry restrictions on vessels during bridge replacement operations. This rule is...

  10. 78 FR 53668 - Regulated Navigation Area; Maine Kennebec Bridge Construction Zone, Kennebec River, Richmond, ME

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-30

    ...-AA11 Regulated Navigation Area; Maine Kennebec Bridge Construction Zone, Kennebec River, Richmond, ME... surrounding the Maine Kennebec Bridge between Richmond, ME, and Dresden, ME. This RNA allows the Coast Guard to enforce speed and wake restrictions and prohibit all vessel traffic through the RNA during bridge...

  11. 78 FR 12260 - Regulated Navigation Area-Weymouth Fore River, Fore River Bridge Construction, Weymouth and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-22

    ...-AA11 Regulated Navigation Area--Weymouth Fore River, Fore River Bridge Construction, Weymouth and... under and surrounding the Fore River Bridge (Mile 3.5) between Weymouth and Quincy, MA until December 31... prohibit all vessel traffic through the RNA during bridge replacement operations, both planned and...

  12. 19 CFR 123.18 - Equipment and materials for constructing bridges or tunnels between the United States and Canada...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Equipment and materials for constructing bridges... bridges or tunnels between the United States and Canada or Mexico. (a) Admission of equipment and materials. Equipment for use in construction of bridges or tunnels between the United States and Canada or...

  13. Stress-corrosion susceptibility of highway bridge construction steels. Phase I

    DOT National Transportation Integrated Search

    1972-04-01

    A catalog of steels used in highway bridge construction has been developed. A state-of-the-art survey on the stress-corrosion susceptibility of these steels has been conducted. The types and concentrations of corrosives that can be experienced in the...

  14. Structural characterization of UHPC waffle bridge deck and connections : [tech transfer summary].

    DOT National Transportation Integrated Search

    2014-07-01

    Contribute to design an innovative and durable precast deck alternative : using ultra-high performance concrete (UHPC) for accelerated bridge : construction : Evaluate the structural characteristics of the UHPC waffle deck, : critical connect...

  15. Analytical solution of the problem of acceleration of cargo by a bridge crane with constant acceleration at elimination of swings of a cargo rope

    NASA Astrophysics Data System (ADS)

    Korytov, M. S.; Shcherbakov, V. S.; Titenko, V. V.

    2018-01-01

    Limitation of the swing of the bridge crane cargo rope is a matter of urgency, as it can significantly improve the efficiency and safety of the work performed. In order to completely dampen the pendulum swing after the break-up of a bridge or a bridge-crane freight cart to maximum speed, it is necessary, in the normal repulsion control of the electric motor, to split the process of dispersion into a minimum of three gaps. For a dynamic system of swinging of a bridge crane on a flexible cable hanger in a separate vertical plane, an analytical solution was obtained to determine the temporal dependence of the cargo rope angle relative to the gravitational vertical when the cargo suspension point moves with constant acceleration. The resulting analytical dependence of the cargo rope angle and its first derivative can break the process of dispersing the cargo suspension point into three stages of dispersal and braking with various accelerations and enter maximum speed of movement of the cargo suspension point. In doing so, the condition of eliminating the swings of the cargo rope relative to the gravitational vertical is fulfilled. Provides examples of the maximum speed output constraints-to-time when removing the rope swing.

  16. A study of girder deflections during bridge deck construction : final report.

    DOT National Transportation Integrated Search

    1971-01-01

    Problems involved in obtaining the desired thickness of bridge decks were investigated. The study, which was limited to decks which were longitudinally screeded during construction, included (1) field measurements of the girder deflections during con...

  17. 78 FR 59231 - Regulated Navigation Area-Tappan Zee Bridge Construction Project, Hudson River; South Nyack and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-26

    ... 1625-AA11 Regulated Navigation Area--Tappan Zee Bridge Construction Project, Hudson River; South Nyack... Hudson River surrounding the Tappan Zee Bridge. This temporary interim rule allows the Coast Guard to enforce speed and wake restrictions and prohibit all vessel traffic through the RNA during bridge...

  18. Effect of voids in grouted, post-tensioned concrete bridge construction : volume 2--inspection, repair, materials, and risks.

    DOT National Transportation Integrated Search

    2009-09-01

    Post-tensioned (PT) bridges are major structures that carry significant traffic. These bridges are designed and : constructed because they are economical for spanning long distances. In Texas, there are several signature PT : bridges. In the late 199...

  19. Latex-modified fiber-reinforced concrete bridge deck overlay : construction/interim report.

    DOT National Transportation Integrated Search

    1993-06-01

    Latex-modified concrete (LMC) is Portland cement concrete (PCC) with an admixture of latex. LMC is considered to be nearly impermeable to chlorides and is extensively used to construct bridge deck overlays. Unfortunately, some of these overlays have ...

  20. Construction of the bridge in the cavern in the Vrata tunnel (Croatia)

    NASA Astrophysics Data System (ADS)

    Garasic, Mladen; Sasa Kovacevic, Meho; Juric-Kacunic, Danijela

    2010-05-01

    In the Dinaric karst system in Croatia some 11500 speleological objects have been explored so far, more than 1000 of which were discovered during construction works. Such speleological objects without natural entrance on the terrain surface (which are called "caverns") have been discovered on the construction sites of the highways. Over the past twenty years they have been systematically investigated and treated. A special kind of remediation was conducted in the cavern's large hall of the "Vrata" tunnel on the Zagreb - Rijeka highway. Due to size, shape, cavern's position and hydrogeological parameters (fissured and karstified aquifers) within the karst system it was necessary to design and construct a 58 m bridge over the cavern. In addition, the cavern's vault had to be reinforced and stabilized, as the overburden was very thin. The beam-and -stringer grid with special anchors was used. The cavern's rehabilitation in the "Vrata" tunnel was a unique undertaking, and the bridge (without piers) is the cavern's longest bridge in the world. A speleological object of large dimensions was discovered in the "Vrata"tunnel's right tube on the Rijeka-Zagreb highway. Speleological, geotechnical, engineering geological and hydrogeological investigation works were carried out for the purpose of preservation the speleological object (cavern). On the basis of classification results of rock masses and conducted numerical analyses the support system for the cavern's vault stabilization was selected. The support system's elements include the beam-and-stringer grid constructed on the terrain's surface above the cavern, tendons and geotechnical anchors. To ensure stability of the speleological object, and to conduct the backward numerical analyses the measurement of vertical deformations from the terrain's surface along the rock's mass by means of sliding micrometers was undertaken. Backward numerical analyses combined with geotechnical measurements enable safer and more rational

  1. Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects

    DOT National Transportation Integrated Search

    1996-01-01

    These standard specifications were issued primarily for constructing roads and bridges on Federal Highway projects under the direct administration of the Federal Highway Administration. These specifications are cited as "FP-96" indicating Standard Sp...

  2. Lean Construction Applications for Bridge Inspection

    DOT National Transportation Integrated Search

    2017-10-01

    Lean philosophy was used to analyze the efficiency of bridge inspection. Emphasis was put on identifying activities that add value to the final output, an owner approved bridge inspection report. 26 bridge inspections were shadowed. Time spent on bri...

  3. Rapid replacement/construction of bridges.

    DOT National Transportation Integrated Search

    2012-11-01

    Bridges are a key element of the transportation system because they control system capacity and are normally built at : the highest cost to the system. Once a bridge reaches its useful design service life, it needs to be replaced or : reconstructed i...

  4. Evaluation of grit-impregnated, epoxy coated prestressing strand on South Slough (Charleston) Bridge : construction report.

    DOT National Transportation Integrated Search

    1991-12-01

    Construction of the South Slough (Charleston) Bridge was completed in March of 1991. The structure was constructed with prestressed concrete beams using grit-impregnated, epoxy coated prestressing strands. While epoxy coated reinforcing steel has bee...

  5. Field performance of timber bridges. 7, Connell Lake stress-laminated deck bridge

    Treesearch

    L. E. Hislop; M. A. Ritter

    The Connell Lake bridge was constructed in early 1991 on the Tongass National Forest, Alaska, as a demonstration bridge under the Timber Bridge Initiative. The bridge is a stress-laminated deck structure with an approximate 36-ft length and 18-ft width and is the first known stress-laminated timber bridge constructed in Alaska. Performance of the bridge was monitored...

  6. Simple analysis of the effect of construction materials on bridge impact factors

    DOT National Transportation Integrated Search

    1999-06-01

    The purpose of this research is to study the influence of different construction materials on the dynamic impact factor of bridges. Initially, introduction of the dynamic impact factor and some evaluation methods are presented. A comparison of the re...

  7. The key quality control technology of main cable erection in long-span suspension bridge construction

    NASA Astrophysics Data System (ADS)

    Chen, Yongrui; Wei, Wei; Dai, Jie

    2017-04-01

    Main cable is one of the most important structure of suspension Bridges, which bear all the dead and live load from upper structure. Cable erection is one of the most critical process in suspension bridge construction. Key points about strand erection are studied in this paper, including strand traction, lateral movement, section adjustment, placing into saddle, anchoring, line shape adjustment and keeping, and tension control. The technology has helped a long-span suspension bridge in Yunnan Province, China get a ideal finished state.

  8. Three-unit bridge construction in anterior single-pontic areas using a metal-free restorative.

    PubMed

    Narcisi, E M

    1999-02-01

    A new glass-ceramic material, IPS Empress 2, is revolutionizing esthetic restorative dentistry by allowing metal-free, three-unit bridge construction in anterior and premolar single-pontic areas. The case discussed in this article illustrates the material's application in the dual-arch restoration of a young woman with congenitally missing teeth. The material was used as an alternative to single-tooth implant restorations to place two maxillary three-unit bridges, one mandibular three-unit bridge, and two mandibular porcelain veneers. IPS Empress 2 provides an esthetic alternative to porcelain-fused-to-metal restorations by facilitating attractive, functional tooth restoration.

  9. 3D laser scanning for quality control and assurance in bridge deck construction.

    DOT National Transportation Integrated Search

    2014-08-01

    The inspection of installations of rebar and other embedded components in bridge deck construction is a tedious : task for eld inspectors, requiring considerable eld time for measurement and verication against code requirement. The verica...

  10. A novel methodology for quantifying the performance of constructed bridges in cold regions.

    DOT National Transportation Integrated Search

    2014-04-01

    This report presents a two-part research program examining the performance of constructed bridges in a : cold region, represented by those in the State of North Dakota, and the behavior of concrete members : strengthened with carbon fiber reinforced ...

  11. Accelerated aging test results for aerospace wire insulation constructions

    NASA Technical Reports Server (NTRS)

    Dunbar, William G.

    1995-01-01

    Several wire insulation constructions were evaluated with and without continuous glow discharges at low pressure and high temperature to determine the aging characteristics of acceptable wire insulation constructions. It was known at the beginning of the test program that insulation aging takes several years when operated at normal ambient temperature and pressure of 20 C and 760 torr. Likewise, it was known that the accelerated aging process decreases insulation life by approximately 50% for each 10 C temperature rise. Therefore, the first phases of the program, not reported in these test results, were to select wire insulation constructions that could operate at high temperature and low pressure for over 10,000 hours with negligible shrinkage and little materials' deterioration.The final phase of the program was to determine accelerated aging characteristics. When an insulation construction is subjected to partial discharges the insulation is locally heated by the bombardment of the discharges, the insulation is also subjected to ozone and other deteriorating gas particles that may significantly increase the aging process. Several insulation systems using either a single material or combinations of teflon, kapton, and glass insulation constructions were tested. All constructions were rated to be partial discharge and/or corona-free at 240 volts, 400 Hz and 260 C (500 F) for 50, 000 hours at altitudes equivalent to the Paschen law. Minimum partial discharge aging tests were preceded by screening tests lasting 20 hours at 260 C. The aging process was accelerated by subjecting the test articles to temperatures up to 370 C (700 F) with and without partial discharges. After one month operation with continuous glow discharges surrounding the test articles, most insulation systems were either destroyed or became brittle, cracked, and unsafe for use. Time with space radiation as with partial discharges is accumulative.

  12. Accelerated aging test results for aerospace wire insulation constructions

    NASA Astrophysics Data System (ADS)

    Dunbar, William G.

    1995-11-01

    Several wire insulation constructions were evaluated with and without continuous glow discharges at low pressure and high temperature to determine the aging characteristics of acceptable wire insulation constructions. It was known at the beginning of the test program that insulation aging takes several years when operated at normal ambient temperature and pressure of 20 C and 760 torr. Likewise, it was known that the accelerated aging process decreases insulation life by approximately 50% for each 10 C temperature rise. Therefore, the first phases of the program, not reported in these test results, were to select wire insulation constructions that could operate at high temperature and low pressure for over 10,000 hours with negligible shrinkage and little materials' deterioration.The final phase of the program was to determine accelerated aging characteristics. When an insulation construction is subjected to partial discharges the insulation is locally heated by the bombardment of the discharges, the insulation is also subjected to ozone and other deteriorating gas particles that may significantly increase the aging process. Several insulation systems using either a single material or combinations of teflon, kapton, and glass insulation constructions were tested. All constructions were rated to be partial discharge and/or corona-free at 240 volts, 400 Hz and 260 C (500 F) for 50, 000 hours at altitudes equivalent to the Paschen law. Minimum partial discharge aging tests were preceded by screening tests lasting 20 hours at 260 C. The aging process was accelerated by subjecting the test articles to temperatures up to 370 C (700 F) with and without partial discharges. After one month operation with continuous glow discharges surrounding the test articles, most insulation systems were either destroyed or became brittle, cracked, and unsafe for use. Time with space radiation as with partial discharges is accumulative.

  13. Field performance of timber bridges. 6, Hoffman Run stress-laminated deck bridge

    Treesearch

    M. A. Ritter; P. D. Hilbrich Lee; G. J. Porter

    The Hoffman Run bridge, located just outside Dahoga, Pennsylvania, was constructed in October 1990. The bridge is a simple-span, single-lane, stress-laminated deck superstructure that is approximately 26 ft long and 16 ft wide. It is the second stress-laminated timber bridge to be constructed of hardwood lumber in Pennsylvania. The performance of the bridge was...

  14. Determining the Environmental Benefits of Ultra High Performance Concrete as a Bridge Construction Material

    NASA Astrophysics Data System (ADS)

    Lande Larsen, Ingrid; Granseth Aasbakken, Ida; O'Born, Reyn; Vertes, Katalin; Terje Thorstensen, Rein

    2017-10-01

    Ultra High Performance Concrete (UHPC) is a material that is attracting attention in the construction industry due to the high mechanical strength and durability, leading to structures having low maintenance requirements. The production of UHPC, however, has generally higher environmental impact than normal strength concrete due to the increased demand of cement required in the concrete mix. What is still not sufficiently investigated, is if the longer lifetime, slimmer construction and lower maintenance requirements lead to a net environmental benefit compared to standard concrete bridge design. This study utilizes life cycle assessment (LCA) to determine the lifetime impacts of two comparable highway crossing footbridges spanning 40 meters, designed respectively with UHPC and normal strength concrete. The results of the study show that UHPC is an effective material for reducing lifetime emissions from construction and maintenance of long lasting infrastructure, as the UHPC design outperforms the normal strength concrete bridge in most impact categories.

  15. Two-course bonded concrete bridge deck construction : condition and performance after six years.

    DOT National Transportation Integrated Search

    1981-01-01

    This report presents the findings from a six-year study of two-course bonded concrete bridge decks constructed in Virginia. Each of three special portland cement concretes was applied as an overlay, or wearing course, on two experimental spans. The o...

  16. 23 CFR 661.41 - After a bridge project has been completed (either PE or construction) what happens with the...

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 23 Highways 1 2011-04-01 2011-04-01 false After a bridge project has been completed (either PE or... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION ENGINEERING AND TRAFFIC OPERATIONS INDIAN RESERVATION ROAD BRIDGE PROGRAM § 661.41 After a bridge project has been completed (either PE or construction) what happens with...

  17. 23 CFR 661.41 - After a bridge project has been completed (either PE or construction) what happens with the...

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false After a bridge project has been completed (either PE or... ADMINISTRATION, DEPARTMENT OF TRANSPORTATION ENGINEERING AND TRAFFIC OPERATIONS INDIAN RESERVATION ROAD BRIDGE PROGRAM § 661.41 After a bridge project has been completed (either PE or construction) what happens with...

  18. Determination of bridge response using acceleration data.

    DOT National Transportation Integrated Search

    1996-01-01

    Knowledge of the actual displacement response of a bridge subjected to random traffic loading is useful in evaluating bridge performance and serviceability. However, mounting displacement transducers is difficult, and the feasibility of and cost asso...

  19. Performance Assessment of Bridges Using GPS: The Juarez Bridge in Culiacan, Mexico

    NASA Astrophysics Data System (ADS)

    Vazquez, G. E.; Gaxiola-Camacho, J. R.; Trejo, M.; Echagaray, J.; Guzman, G. M.

    2015-12-01

    Performance assessment of bridges has become very important during recent years. Bridges around the world are aging, leading to the incorporation of efficient, reliable, and economic evaluation procedures. These techniques must assess properly the performance of bridges under several loading conditions in a real manner, representing the physics of the problem. Among several approaches, Global Positioning System (GPS) can be intelligently used for the performance evaluation of bridges. We focused on GPS, since it naturally produces position estimates as compared to seismic instruments that record either velocity or acceleration, and thus require an integration. There are several reasons that make the Juarez Bridge a case of study for evaluation: it is approximately 45 years old, it is a reinforced concrete structure, it connects two significant zones of the city, and its spans is closely to 200 meters long. In addition, thousands of vehicles and pedestrians use the Juarez Bridge every day, which make feasible the GPS performance assessment. Hence, in order to produce optimal position estimates, GPS data were collected during two consecutive hours at three different periods of the day for a whole week (Monday through Sunday), to represent three critical limit states of the bridge (mid-span and end-spans). GPS data were processed using the GAMIT/GLOBK software, considering 1-second sampling rate, 15-degree cutoff angle, ionosphere-free double-differenced (DD) carrier phase method, and precise final orbits disseminated by IGS (International GNSS Service). The displacements obtained from the above discussed procedure are compared with allowable values documented in bridge construction manuals. Reliability theory was used to evaluate the probability of failure of the bridge for the three periods of the day. In addition, a conclusion was made about the most risky day of the week for the use of the Juarez Bridge. It is expected that the results from the proposed research

  20. Field performance of timber bridges. 5, Little Salmon Creek stress-laminated deck bridge

    Treesearch

    M. A. Ritter; J. A. Kainz; G. J. Porter

    The Little Salmon Creek bridge was constructed in November 1988 on the Allegheny National Forest in Pennsylvania. The bridge is a simple span, single-lane, stress-laminated deck superstructure that is approximately 26-ft long and 16-ft wide. The bridge is unique in that it is the first known stress-laminated timber bridge to be constructed of hardwood lumber. The...

  1. Design, installation, and condition assessment of a concrete bridge deck constructed with ASTM A1035 CS no. 4 bars.

    DOT National Transportation Integrated Search

    2017-06-01

    Recently developed corrosion-resistant reinforcing structural design guidelines were used to design, construct, and : assess a reinforced concrete bridge deck with high-strength ASTM A1035 CS steel bars. The bridge replacement is located : along the ...

  2. Accelerator tube construction and characterization for a tandem-electrostatic-quadrupole for accelerator-based boron neutron capture therapy.

    PubMed

    Cartelli, D; Vento, V Thatar; Castell, W; Di Paolo, H; Kesque, J M; Bergueiro, J; Valda, A A; Erhardt, J; Kreiner, A J

    2011-12-01

    The accelerator tubes are essential components of the accelerator. Their function is to transport and accelerate a very intense proton or deuteron beam through the machine, from the ion source to the neutron production target, without significant losses. In this contribution, we discuss materials selected for the tube construction, the procedures used for their assembly and the testing performed to meet the stringent requirements to which it is subjected. Copyright © 2011 Elsevier Ltd. All rights reserved.

  3. Underwater acoustic noise generation and propagation resulting from pile driving for Oregon bridge construction.

    DOT National Transportation Integrated Search

    2014-06-01

    There is growing concern about noise levels from pile driving activities associated with the : construction of highway bridges and other in-water structures. It has been demonstrated that noise : generated from pile driving with an impact hammer can ...

  4. Monitoring of wind load and response for cable-supported bridges in Hong Kong

    NASA Astrophysics Data System (ADS)

    Wong, Kai-yuen; Chan, Wai-Yee K.; Man, King-Leung

    2001-08-01

    Structural health monitoring for the three cable-supported bridges located in the West of Hong Kong or the Tsing Ma Control Area has been carried out since the opening of these bridges to public traffic. The three cable-supported bridges are referred to as the Tsing Ma (suspension) Bridge, the Kap Shui Mun (cable-stayed) Bridge and the Ting Kau (cable-stayed) Bridge. The structural health monitoring works involved are classified as six monitoring categories, namely, wind load and response, temperature load and response, traffic load and response, geometrical configuration monitoring, strains and stresses/forces monitoring and global dynamic characteristics monitoring. As wind loads and responses had been a major concern in the design and construction stages, this paper therefore outlines the work of wind load and response monitoring on Tsing Ma, Kap Shui Mun and Ting Kau Bridges. The paper starts with a brief description of the sensory systems. The description includes the layout and performance requirements of sensory systems for wind load and responses monitoring. Typical results of wind load and response monitoring in graphical forms are then presented. These graphical forms include the plots of wind rose diagrams, wind incidences vs wind speeds, wind turbulence intensities, wind power spectra, gust wind factors, coefficient of terrain roughness, extreme wind analyses, deck deflections/rotations vs wind speeds, acceleration spectra, acceleration/displacement contours, and stress demand ratios. Finally conclusions on wind load and response monitoring on the three cable-supported bridges are drawn.

  5. A survey and photographic inventory of metal truss bridges in Virginia, 1865-1932 : V : the Richmond construction district.

    DOT National Transportation Integrated Search

    1976-01-01

    Prior to 1932, road maintenance and construction in Virginia were largely the responsibility of the individual county governments. Bridge construction projects, based on local requirements, formed a natural part of these activities. Local responsibil...

  6. A survey and photographic inventory of metal truss bridges in Virginia, 1865-1932 : IV : the Fredericksburg construction district.

    DOT National Transportation Integrated Search

    1976-01-01

    Prior to 1932, road maintenance and construction in Virginia were largely the responsibility of the individual county governments. Bridge construction projects, based on local requirements, formed a natural part of these activities. Local responsibil...

  7. Learning Based on the Project Entitled "Design and Construction of a Wooden Bridge"

    ERIC Educational Resources Information Center

    Barris, Cristina; Torres, Lluís; Simon, Enric

    2016-01-01

    This article presents the results of a case involving the application of project-based learning carried out with students in the Mechanical Engineering degree program at the University of Girona. The project, entitled "Design and construction of a wooden bridge", was conducted at the Polytechnic School in the third-year Structures…

  8. Field performance of timber bridges. 10, Sanborn Brook stress-laminated deck bridge

    Treesearch

    P. D. Hilbrich Lee; J. P. Wacker; M. A. Ritter

    The Sanborn Brook bridge was constructed in August 1991, 10 miles northeast of Concord, New Hampshire, as part of the demonstration timber bridge program of the USDA Forest Service. The bridge is a simple-span, double-lane, stress-laminated deck superstructure constructed from Southern Pine lumber and is approximately 25 ft long and 28 ft wide with a skew of 14 degrees...

  9. A survey and photographic inventory of metal truss bridges in Virginia, 1865-1932 : II : the Staunton construction district.

    DOT National Transportation Integrated Search

    1975-01-01

    Prior to 1932, road maintenance and construction in Virginia were largely the responsibility of the individual county governments. Bridge construction projects formed a natural part of these activities. Local responsibility resulted in a rich variety...

  10. A survey and photographic inventory of metal truss bridges in Virginia, 1865-1932 : III : the Culpeper construction district.

    DOT National Transportation Integrated Search

    1975-01-01

    Prior to 1932, road maintenance and construction in Virginia were largely the responsibility of the individual county governments. Bridge construction projects formed a natural part of these activities. Local responsibility resulted in a rich variety...

  11. Modal Identification of Tsing MA Bridge by Using Improved Eigensystem Realization Algorithm

    NASA Astrophysics Data System (ADS)

    QIN, Q.; LI, H. B.; QIAN, L. Z.; LAU, C.-K.

    2001-10-01

    This paper presents the results of research work on modal identification of Tsing Ma bridge ambient testing data by using an improved eigensystem realization algorithm. The testing was carried out before the bridge was open to traffic and after the completion of surfacing. Without traffic load, ambient excitations were much less intensive, and the bridge responses to such ambient excitation were also less intensive. Consequently, the bridge responses were significantly influenced by the random movement of heavy construction vehicles on the deck. To cut off noises in the testing data and make the ambient signals more stationary, the Chebyshev digital filter was used instead of the digital filter with a Hanning window. Random decrement (RD) functions were built to convert the ambient responses to free vibrations. An improved eigensystem realization algorithm was employed to improve the accuracy and the efficiency of modal identification. It uses cross-correlation functions ofRD functions to form the Hankel matrix instead of RD functions themselves and uses eigenvalue decomposition instead of singular value decomposition. The data for response accelerations were acquired group by group because of limited number of high-quality accelerometers and channels of data loggers available. The modes were identified group by group and then assembled by using response accelerations acquired at reference points to form modes of the complete bridge. Seventy-nine modes of the Tsing Ma bridge were identified, including five complex modes formed in accordance with unevenly distributed damping in the bridge. The identified modes in time domain were then compared with those identified in frequency domain and finite element analytical results.

  12. Field performance of timber bridges. 14, Dean, Hibbsville, and Decatur stress-laminated deck bridges

    Treesearch

    P. D. Hilbrich Lee; M. A. Ritter; S. Golston; K. Hinds

    1984-01-01

    The Dean, Hibbsville, and Decatur bridges were constructed in southern Iowa during 1994. Each bridge is a simple-span, stress-laminated deck superstructure, approximately 7.3 m (24 ft) long, constructed from eastern cottonwood lumber. The performance of each bridge was monitored for approximately 2 years, beginning shortly after installation. Monitoring involved...

  13. A novel methodology for quantifying the performance of constructed bridges in cold regions : [project brief].

    DOT National Transportation Integrated Search

    2014-04-01

    This report presents a two-part research program examining the performance of constructed : bridges in a cold region, represented by those in the State of North Dakota, and the behavior of : concrete members strengthened with carbon fiber reinforced ...

  14. Feasibility evaluation of utilizing high-strength concrete in design and construction of highway bridge structures.

    DOT National Transportation Integrated Search

    1994-01-01

    The objective of this investigation was to evaluate the feasibility of using high-strength concrete in the design and construction of highway bridge structures. A literature search was conducted; a survey of five regional fabrication plants was perfo...

  15. Preservation treatment for wood bridge application

    Treesearch

    Jake Bigelow; Stan Lebow; Carol A. Clausen; Lowell Greimann; Terry J. Wipf

    2009-01-01

    Timber can often be a cost-effective construction material for new bridges. The durability of the bridge greatly depends on proper attention to construction details and fabrication, as well as proper preservative treatment before, during, and after construction. Material repair and replacement costs for bridges are a considerable expense for highway agencies. To...

  16. Field performance of timber bridges. 8, Lynches Woods Park stress-laminated deck bridge

    Treesearch

    J. P. Wacker; M. A. Ritter; D. Conger

    The Lynches Woods Park bridge was constructed during the summer of 1990 in Newberry, South Carolina. It is a single-span, single-lane, stress-laminated deck superstructure that measures approximately 30 ft long, 16 ft wide, and 14 in. deep. The bridge is unique in that is one of the first known stress-laminated deck bridges to be constructed of Southern Pine lumber...

  17. Development of a precast bridge deck overhang system for the rock creek bridge.

    DOT National Transportation Integrated Search

    2008-12-01

    Precast, prestressed panels are commonly used at interior beams for bridges in Texas. The use of these : panels provides ease of construction, sufficient capacity, and good economy for the construction of : bridges in Texas. Current practice for the ...

  18. Characterization of water-quality and bed-sediment conditions in Currituck Sound, North Carolina, prior to the Mid-Currituck Bridge construction, 2011–15

    USGS Publications Warehouse

    Wagner, Chad R.; Fitzgerald, Sharon; Antolino, Dominick J.

    2015-12-24

    The characterization of water-quality and bed-sediment chemistry in Currituck Sound along the proposed alignment of the Mid-Currituck Bridge summarized herein provides a baseline for determining the effect of bridge construction and bridge deck runoff on environmental conditions in Currituck Sound.

  19. Design, construction and load testing of the Pat Daly Bridge in Washington County, MO, with internal glass fiber reinforced polymers reinforcement.

    DOT National Transportation Integrated Search

    2013-01-01

    The overarching goal of this project is to deploy and assess an innovative corrosion-free bridge construction technology for long-term : performance of new and existing bridges. The research objective of this project is to conduct a comprehensive stu...

  20. Evaluation of a highway bridge constructed using high strength lightweight concrete bridge girders.

    DOT National Transportation Integrated Search

    2011-04-01

    The purpose of this research was to characterize the performance of High Strength Lightweight Concrete (HSLW) in precast, prestressed bridge girders and to evaluate their performance in a highway bridge. The mechanical properties and long-term time-d...

  1. Field performance of timber bridges. 4, Graves Crossing stress-laminated deck bridge

    Treesearch

    J. P. Wacker; M. A. Ritter

    The Graves Crossing bridge was constructed October 1991 in Antrim County, Michigan, as part of the demonstration timber bridge program sponsored by the USDA Forest Service. The bridge is a two-span continuous, stress-laminated deck superstructure and it is 36-ft long and 26-ft wide. The bridge is one of the first stress-laminated deck bridges to be built of sawn lumber...

  2. Field performance of timber bridges. 13, Mohawk Canal stress-laminated bridge

    Treesearch

    P. D. Hilbrich Lee; X. Lauderdale

    The Mohawk Canal bridge was constructed in August 1994, just outside Roll, Arizona. It is a simple-span, double-lane, stress-laminated deck superstructure, approximately 6.4 m (21 ft) long and 10.4 m (34 ft) wide and constructed with Combination 16F-V3 Douglas Fir glued-laminated timber beam laminations. The performance of the bridge was monitored continuously for 2...

  3. Field Performance of Timber Bridges. 16: North Siwell Road Stress-Laminated Bridge

    DOT National Transportation Integrated Search

    1998-03-01

    This report is 16th in a series of reports that documents the : field performance of timber bridges. The North Siwell Road bridge was constructed during December 1994 in Hinds County, Mississippi. The bridge is a single span, stress laminated T-beam ...

  4. Wireless Smart Sensor Network System Using SmartBridge Sensor Nodes for Structural Health Monitoring of Existing Concrete Bridges

    NASA Astrophysics Data System (ADS)

    Gaviña, J. R.; Uy, F. A.; Carreon, J. D.

    2017-06-01

    There are over 8000 bridges in the Philippines today according to the Department of Public Works and Highways (DPWH). Currently, visual inspection is the most common practice in monitoring the structural integrity of bridges. However, visual inspections have proven to be insufficient in determining the actual health or condition of a bridge. Structural Health Monitoring (SHM) aims to give, in real-time, a diagnosis of the actual condition of the bridge. In this study, SmartBridge Sensor Nodes were installed on an existing concrete bridge with American Association of State Highway and Transportation Officials (AASHTO) Type IV Girders to gather vibration of the elements of the bridge. Also, standards on the effective installation of SmartBridge Sensor Nodes, such as location and orientation was determined. Acceleration readings from the sensor were then uploaded to a server, wherein they are monitored against certain thresholds, from which, the health of the bridge will be derived. Final output will be a portal or webpage wherein the information, health, and acceleration readings of the bridge will be available for viewing. With levels of access set for different types of users, the main users will have access to download data and reports. Data transmission and webpage access are available online, making the SHM system wireless.

  5. The functional-cognitive framework as a tool for accelerating progress in cognitive neuroscience: On the benefits of bridging rather than reducing levels of analyses.

    PubMed

    Vahey, Nigel; Whelan, Robert

    2016-02-01

    The subject matter of neuroscience research is complex, and synthesising the wealth of data from this research to better understand mental processes is challenging. A useful strategy, therefore, may be to distinguish explicitly between the causal effects of the environment on behaviour (i.e. functional analyses) and the mental processes that mediate these effects (i.e. cognitive analyses). In this article, we describe how the functional-cognitive (F-C) framework can accelerate cognitive neuroscience and also advance a functional treatment of brain activity. We first highlight that cognitive neuroscience can particularly benefit from the F-C approach by providing an alternative to the problematic practice of reducing cognitive constructs to behavioural and/or neural proxies. Next, we outline how functional (behaviour-environment) relations can serve as a bridge between cognitive and neural processes by restoring mental constructs to their original role as heuristic tools. Finally, we give some examples of how both cognitive neuroscience and traditional functional approaches can mutually benefit from the F-C framework. © 2015 International Union of Psychological Science.

  6. Geotextile reinforced bridge approach embankment : Lake River Bridge : Malin Highway , Klamath County, Oregon : construction report.

    DOT National Transportation Integrated Search

    1993-03-01

    The transition from the roadway to the deck of a rigidly supported bridge is of concern to engineers and the travelling public. It is a common occurrence to feel a discontinuity between the roadway and bridge structure. Bridge engineers have tried to...

  7. Research notes : polymer concrete bridge deck overlays : Deschutes River Bridge (Biggs), Maupin Bridge (Maupin) : final report.

    DOT National Transportation Integrated Search

    1995-07-01

    This report documents the construction and performance of two thin polymer concrete (with polyester/styrene resins) bridge deck overlays. The overlays were constructed in Biggs and Maupin, Oregon in June 1993. Construction of the overlays was less th...

  8. Reserves in load capacity assessment of existing bridges

    NASA Astrophysics Data System (ADS)

    Žitný, Jan; Ryjáček, Pavel

    2017-09-01

    High percentage of all railway bridges in the Czech Republic is made of structural steel. Majority of these bridges is designed according to historical codes and according to the deterioration, they have to be assessed if they satisfy the needs of modern railway traffic. The load capacity assessment of existing bridges according to Eurocodes is however often too conservative and especially, braking and acceleration forces cause huge problems to structural elements of the bridge superstructure. The aim of this paper is to review the different approaches for the determination of braking and acceleration forces. Both, current and historical theoretical models and in-situ measurements are considered. The research of several local European state norms superior to Eurocode for assessment of existing railway bridges shows the big diversity of used local approaches and the conservativeness of Eurocode. This paper should also work as an overview for designers dealing with load capacity assessment, revealing the reserves for existing bridges. Based on these different approaches, theoretical models and data obtained from the measurements, the method for determination of braking and acceleration forces on the basis of real traffic data should be proposed.

  9. A construct-network approach to bridging diagnostic and physiological domains: application to assessment of externalizing psychopathology.

    PubMed

    Patrick, Christopher J; Venables, Noah C; Yancey, James R; Hicks, Brian M; Nelson, Lindsay D; Kramer, Mark D

    2013-08-01

    A crucial challenge in efforts to link psychological disorders to neural systems, with the aim of developing biologically informed conceptions of such disorders, is the problem of method variance (Campbell & Fiske, 1959). Since even measures of the same construct in differing domains correlate only moderately, it is unsurprising that large sample studies of diagnostic biomarkers yield only modest associations. To address this challenge, a construct-network approach is proposed in which psychometric operationalizations of key neurobehavioral constructs serve as anchors for identifying neural indicators of psychopathology-relevant dispositions, and as vehicles for bridging between domains of clinical problems and neurophysiology. An empirical illustration is provided for the construct of inhibition-disinhibition, which is of central relevance to problems entailing deficient impulse control. Findings demonstrate that: (1) a well-designed psychometric index of trait disinhibition effectively predicts externalizing problems of multiple types, (2) this psychometric measure of disinhibition shows reliable brain response correlates, and (3) psychometric and brain-response indicators can be combined to form a joint psychoneurometric factor that predicts effectively across clinical and physiological domains. As a methodology for bridging between clinical problems and neural systems, the construct-network approach provides a concrete means by which existing conceptions of psychological disorders can accommodate and be reshaped by neurobiological insights. PsycINFO Database Record (c) 2013 APA, all rights reserved.

  10. Development and construction of low-cracking high-performance concrete (LC-HPC) bridge decks : free shrinkage, moisture optimization and concrete production : final report.

    DOT National Transportation Integrated Search

    2009-08-01

    The development and evaluation of low-cracking high-performance concrete (LC-HPC) for use in bridge decks : is described based on laboratory test results and experience gained during the construction of 14 bridges. This report : emphasizes the materi...

  11. Development and construction of low-cracking high-performance concrete (LC-HPC) bridge decks : free shrinkage, moisture optimization and concrete production : summary report.

    DOT National Transportation Integrated Search

    2009-08-01

    The development and evaluation of low-cracking high-performance concrete (LC-HPC) for use in bridge decks : is described based on laboratory test results and experience gained during the construction of 14 bridges. This report : emphasizes the materi...

  12. Design, construction and load testing of the Pat Daly road bridge in Washington County, MO, with internal glass fiber reinforced polymers reinforcement.

    DOT National Transportation Integrated Search

    2013-01-01

    The overarching goal of this project is to deploy and assess an innovative corrosion-free bridge construction technology for long-term : performance of new and existing bridges. The research objective of this project is to conduct a comprehensive stu...

  13. 6. VIEW OF GDOT BRIDGE NO. 02700268X00678N BRIDGE PLATE IDENTIFYING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF GDOT BRIDGE NO. 027-00268X-00678N BRIDGE PLATE IDENTIFYING COUNTY COMMISSIONERS AT THE TIME OF CONSTRUCTION. - GDOT Bridge No. 027-00268X-00678N, County Road 268-Empress Road span Piscola Creek, Quitman, Brooks County, GA

  14. Polymer concrete bridge deck overlays : Deschutes River Bridge (Biggs) and Maupin Bridge (Maupin) : final report.

    DOT National Transportation Integrated Search

    1995-07-01

    This report documents the construction and performance of two thin polymer concrete (with polyester/styrene resins) bridge deck overlays. The overlays were constructed in Biggs and Maupin, Oregon in June 1993. : Several problems were encountered duri...

  15. Feasibility evaluation of utilizing high strength concrete in design and construction of highway bridge structures : interim report.

    DOT National Transportation Integrated Search

    1992-12-01

    The objective of this investigation was to evaluate the feasibility of using high-strength concrete in the design and construction of highway bridge structures. A literature search was conducted; a survey of five regional fabrication plants was perfo...

  16. Field performance of timber bridges. 11, Spearfish Creek stress-laminated box-beam bridge

    Treesearch

    J. P. Wacker; M. A. Ritter; K. Stanfill-McMillan

    The Spearfish Creek bridge was constructed in 1992 in Spearfish, South Dakota. It is a single-span, stress-laminated, box-beam superstructure. Performance of the bridge is being monitored for 5 years, beginning at installation. This report summarizes results for the first 3-1/2 years of monitoring and includes information on the design, construction, and field...

  17. 78 FR 7670 - Safety Zone; Indian Street Bridge Construction, St. Lucie Canal, Palm City, FL

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-04

    ... 1625-AA00 Safety Zone; Indian Street Bridge Construction, St. Lucie Canal, Palm City, FL AGENCY: Coast... zone on the St. Lucie Canal, Palm City, Florida to provide for the safety of life and vessels on a... on a narrow waterway. The temporary safety zone encompasses all waters of the St. Lucie Canal in the...

  18. Field performance of timber bridges. 9, Big Erick`s stress-laminated deck bridge

    Treesearch

    J. A. Kainz; J. P. Wacker; M. Nelson

    The Big Erickas bridge was constructed during September 1992 in Baraga County, Michigan. The bridge is 72 ft long, 16 ft wide, and consists of three simple spans: two stress-laminated deck approach spans and a stress-laminated box center span. The bridge is unique in that it is one of the first known stress-laminated timber bridge applications to use Eastern Hemlock...

  19. Field performance of timber bridges. 16, North Siwell Road stress-laminated bridge

    Treesearch

    J. A. Kainz

    The North Siwell Road bridge was constructed during December 1994 in Hinds County, Mississippi. The bridge is a single-span, stress-laminated T-beam structure that measures 9.1 m (30 ft) long and 8.7 m (28.5 ft) wide. Performance of the bridge was monitored for 24 months, beginning at the time of installation. Monitoring involved gathering and evaluating data relative...

  20. Field performance of timber bridges. 17, Ciphers stress-laminated deck bridge

    Treesearch

    James P. Wacker; James A. Kainz; Michael A. Ritter

    In September 1989, the Ciphers bridge was constructed within the Beltrami Island State Forest in Roseau County, Minnesota. The bridge superstructure is a two-span continuous stress-laminated deck that is approximately 12.19 m long, 5.49 m wide, and 305 mm deep (40 ft long, 18 ft wide, and 12 in. deep). The bridge is one of the first to utilize red pine sawn lumber for...

  1. Accelerating FRET between Near-Infrared Emitting Quantum Dots Using a Molecular J-Aggregate as an Exciton Bridge.

    PubMed

    Wang, Chen; Weiss, Emily A

    2017-09-13

    Fast energy transfer (EnT) among quantum dots (QDs) with near-infrared (NIR) emission is essential for fully exploiting their light harvesting and photon downconversion (multiexciton generation) abilities. This paper demonstrates a relayed EnT mechanism that accelerates the migration of NIR excitons between PbS QDs by a factor of 20 from that of one-step EnT through a polyelectrolyte and even a factor of ∼2 from that of one-step EnT between QDs in direct contact, by employing a J-aggregate (J-agg) of a cyanine dye as an exciton bridge. The donor QDs, acceptor QDs, and J-agg are electrostatically assembled into a sandwich structure with layer-by-layer deposition. Estimates of EnT rate and yield from transient and steady-state absorption and photoluminescence spectroscopies show that the rate-limiting step in the relay is EnT from the donor QD to the J-agg, while EnT from the J-agg to the acceptor QD occurs in <10 ps. A comparison of this system to the analogous solution-phase system suggests that the overall donor-to-acceptor EnT yield in the relay (18%) can be improved by depositing the J-agg with more intermolecular order. This work demonstrates the viability of relayed EnT through a molecular bridge as a strategy for accelerating long-distance exciton migration in assemblies of QDs, in particular in the near-infrared.

  2. Field performance of timber bridges. 15, Pueblo County, Colorado, stress-laminated deck bridge

    Treesearch

    L. E. Hislop

    The Pueblo County 204B bridge was constructed in March 1990 in Pueblo, Colorado, as a demonstration bridge under the USDA Forest Service Timber Bridge Initiative. The stress-laminated deck superstructure is approximately 10 m long, 9 m wide, and 406 mm deep, with a skew of 10 degrees. Performance monitoring was conducted for 3 years, beginning at...

  3. Construction of a photovoltaic power system at Natural Bridges National Monument

    NASA Astrophysics Data System (ADS)

    Benoit, A. E.

    1980-12-01

    A 100 kW peak photovoltaic (PV) power system at Natural Bridges National Monument in Utah is described. This system is the largest of its kind in the world. The construction phases of the program are described, and a chronological history of the events and problems encountered when such a large and complex task is undertaken in a remote area with very limited fabrication facilities is given. This experiment demonstrates the application of solar energy to the variety of loads found in a small and remote community. This solar energy system was designed to meet all electrical requirements when there is no utility grid, with only occasional back-up from an existing diesel generator.

  4. Fiberglass reinforced polymer composite bridge deck construction in Illinois

    DOT National Transportation Integrated Search

    2002-09-01

    An experiment was conducted using a fiber reinforced polymer composite material for the bridge deck of a low volume bridge. The test location was on South Fayette Street over the Town Brook in Jacksonville, Illinois. This project included removal of ...

  5. Field performance of timber bridges. 12, Christian Hollow stress-laminated box-beam bridge

    Treesearch

    J. P. Wacker; S. C. Catherman; R. G. Winnett

    In January 1992, the Christian Hollow bridge was constructed in Steuben County, New York. The bridge is a single-span, stress-laminated box-beam superstructure that is 9.1 m long, 9.8 m wide, and 502 mm deep (30 ft long, 32 ft wide, and 19-3/4 in. deep). The performance of the bridge was continuously monitored for 28 months, beginning shortly after installation....

  6. Role to Be Played by Independent Geotechnical Supervision in the Foundation for Bridge Construction

    NASA Astrophysics Data System (ADS)

    Sobala, Dariusz; Rybak, Jarosław

    2017-10-01

    Some remarks concerning the necessity of employing an independent and over all ethical geotechnical survey were presented in the paper. Starting from the design phase, through the whole construction process, the importance of geotechnical engineer is stated in legal acts. Numerous testing technologies serve for the calibration of geotechnical technologies and allow for confirming the quality and capacity of piles. Special emphasis was payed to the involvement of scientifical and research institutions which can not only serve services but also can postprocess and methodize collected data. Such databases enable for new codes, methods and recommendations. Selection of deep foundations for bridge-type structures is most often dependent on complex geotechnical conditions, concentrated loads and constraints for pier displacements. Besides the last ones, prior to more common introduction of the design-construct system, could be a convenient justification for design engineer, who imposed deep foundation because he did not want or was not able to estimate the effect of pier settlement on civil engineering structure. The paper provides some notes about the need to engage a geotechnical supervising service of high competency and ethical quality during engineering and construction stages of foundations for bridge-type structures where legal requirements are of special consideration. Successive stages of projects are reviewed and research methods used for current calibration of geotechnical technologies and verification of geotechnical work quality are analysed. Special attention is given to potential involvement of independent R&D institutions which, apart from rendering specific services, also collect and systemize the research results thus enabling, in the long term, to revise engineering standards, instructions and guidelines.

  7. SOME PROBLEMS IN THE CONSTRUCTION OF AN ELECTRON LINEAR ACCELERATOR (in Dutch)

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Verhaeghe, J.; Vanhuyse, V.; Van Leuven, P.

    1959-01-01

    Special problems encountered in the construction of the electron linear accelerator of the Natuurkundig Laboratorium der Rijksuniversiteit of Ghent are discussed. The subjects considered are magnetic focusing, magnetic screening of the electron gun cathode, abnormal attenuation-multipactor effects, and electron energy control. (J.S.R.)

  8. 33 CFR 115.50 - Application for bridge permits.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 1 2011-07-01 2011-07-01 false Application for bridge permits... BRIDGES BRIDGE LOCATIONS AND CLEARANCES; ADMINISTRATIVE PROCEDURES § 115.50 Application for bridge permits. (a) Application. An application for authorization to construct a bridge across navigable waters of...

  9. 33 CFR 115.50 - Application for bridge permits.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 1 2010-07-01 2010-07-01 false Application for bridge permits... BRIDGES BRIDGE LOCATIONS AND CLEARANCES; ADMINISTRATIVE PROCEDURES § 115.50 Application for bridge permits. (a) Approval of plans. An application for authorization to construct a bridge across navigable waters...

  10. Bridge inspection / washing program : bridge drainage program

    DOT National Transportation Integrated Search

    2002-02-01

    The Rhode Island Department of Transportation, Operations Division is responsible for operation and maintenance of roads and bridges, and construction of highway and multi-modal projects to improve the transportation system of our state. One of the m...

  11. Recommendations for design, construction, and maintenance of bridge approach slabs : synthesis report.

    DOT National Transportation Integrated Search

    2009-04-01

    Bridge approaches provide smooth and safe transition of vehicles from highway pavements to bridge : structures. However, settlement of the bridge approach slab relative to bridge decks usually creates a : bump in the roadway. The bump causes inconven...

  12. Rapid construction of Pacific Street Bridge with o.7 inch strands.

    DOT National Transportation Integrated Search

    2010-10-01

    The Pacific Street Bridge over I-680 in Omaha, NE is the first bridge in the United States to use 0.7-in.-diameter prestressing : strands in pretensioned concrete girders. This project was funded by FHWA through NDOR under the Innovative Bridge Resea...

  13. Identification of sudden stiffness changes in the acceleration response of a bridge to moving loads using ensemble empirical mode decomposition

    NASA Astrophysics Data System (ADS)

    Aied, H.; González, A.; Cantero, D.

    2016-01-01

    The growth of heavy traffic together with aggressive environmental loads poses a threat to the safety of an aging bridge stock. Often, damage is only detected via visual inspection at a point when repairing costs can be quite significant. Ideally, bridge managers would want to identify a stiffness change as soon as possible, i.e., as it is occurring, to plan for prompt measures before reaching a prohibitive cost. Recent developments in signal processing techniques such as wavelet analysis and empirical mode decomposition (EMD) have aimed to address this need by identifying a stiffness change from a localised feature in the structural response to traffic. However, the effectiveness of these techniques is limited by the roughness of the road profile, the vehicle speed and the noise level. In this paper, ensemble empirical mode decomposition (EEMD) is applied by the first time to the acceleration response of a bridge model to a moving load with the purpose of capturing sudden stiffness changes. EEMD is more adaptive and appears to be better suited to non-linear signals than wavelets, and it reduces the mode mixing problem present in EMD. EEMD is tested in a variety of theoretical 3D vehicle-bridge interaction scenarios. Stiffness changes are successfully identified, even for small affected regions, relatively poor profiles, high vehicle speeds and significant noise. The latter is due to the ability of EEMD to separate high frequency components associated to sudden stiffness changes from other frequency components associated to the vehicle-bridge interaction system.

  14. Development of a precast bridge deck overhang system

    DOT National Transportation Integrated Search

    2011-02-01

    Prestressed-precast panels are commonly used at interior beams for bridge decks in Texas. The use of these panels can provide ease : of construction, sufficient capacity, and good economy for the construction of bridge decks in Texas. Current practic...

  15. New conceptual design of portable bamboo bridge for emergency purposes

    NASA Astrophysics Data System (ADS)

    Musthaffa, A. A.; Nor, N. M.; Yusof, M. A.; Yuhazri, M. Y.

    2018-02-01

    Portable bridges serve as routes for troops during the military operations and the disaster relief operation. Nowadays, bamboo has been regarded as one of the alternative construction materials for building and bridge structures. This paper presents the conceptual design of the portable bridge. Several types of portable bridges and bamboo bridges are reviewed in the current work. The characteristics, capability and method of construction of each bridge are discussed. Finally, the conceptual of the portable bamboo bridge for emergency purposes is presented. The idea of producing portable bridge is proposed in the current work as it is crucial for providing route for communities affected by natural disasters.

  16. Reliability Modeling of Double Beam Bridge Crane

    NASA Astrophysics Data System (ADS)

    Han, Zhu; Tong, Yifei; Luan, Jiahui; Xiangdong, Li

    2018-05-01

    This paper briefly described the structure of double beam bridge crane and the basic parameters of double beam bridge crane are defined. According to the structure and system division of double beam bridge crane, the reliability architecture of double beam bridge crane system is proposed, and the reliability mathematical model is constructed.

  17. 19 CFR 123.18 - Equipment and materials for constructing bridges or tunnels between the United States and Canada...

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... or tunnels between the United States and Canada or Mexico. 123.18 Section 123.18 Customs Duties U.S... WITH CANADA AND MEXICO International Traffic § 123.18 Equipment and materials for constructing bridges or tunnels between the United States and Canada or Mexico. (a) Admission of equipment and materials...

  18. 19 CFR 123.18 - Equipment and materials for constructing bridges or tunnels between the United States and Canada...

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... or tunnels between the United States and Canada or Mexico. 123.18 Section 123.18 Customs Duties U.S... WITH CANADA AND MEXICO International Traffic § 123.18 Equipment and materials for constructing bridges or tunnels between the United States and Canada or Mexico. (a) Admission of equipment and materials...

  19. 19 CFR 123.18 - Equipment and materials for constructing bridges or tunnels between the United States and Canada...

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... or tunnels between the United States and Canada or Mexico. 123.18 Section 123.18 Customs Duties U.S... WITH CANADA AND MEXICO International Traffic § 123.18 Equipment and materials for constructing bridges or tunnels between the United States and Canada or Mexico. (a) Admission of equipment and materials...

  20. Monitoring system of arch bridge for safety network management

    NASA Astrophysics Data System (ADS)

    Joo, Bong Chul; Yoo, Young Jun; Lee, Chin Hyung; Park, Ki Tae; Hwang, Yoon Koog

    2010-03-01

    Korea has constructed the safety management network monitoring test systems for the civil infrastructure since 2006 which includes airport structure, irrigation structure, railroad structure, road structure, and underground structure. Bridges among the road structure include the various superstructure types which are Steel box girder bridge, suspension bridge, PSC-box-girder bridge, and arch bridge. This paper shows the process of constructing the real-time monitoring system for the arch bridge and the measured result by the system. The arch type among various superstructure types has not only the structural efficiency but the visual beauty, because the arch type superstructure makes full use of the feature of curve. The main measuring points of arch bridges composited by curved members make a difference to compare with the system of girder bridges composited by straight members. This paper also shows the method to construct the monitoring system that considers the characteristic of the arch bridge. The system now includes strain gauges and thermometers, and it will include various sensor types such as CCTV, accelerometers and so on additionally. For the long term and accuracy monitoring, the latest optical sensors and equipments are applied to the system.

  1. Precast alternative for flat slab bridges : final report.

    DOT National Transportation Integrated Search

    2013-10-26

    The cast-in-place (CIP) concrete slab bridge and the hollow core flat slab bridge are two very common bridge types utilized by the : South Carolina Department of Transportation (SCDOT). The CIP bridge is durable but has a long construction time while...

  2. Geotextile reinforced bridge approach embankment : Lake River Bridge - Malin Highway , Klamath County, Oregon : final report.

    DOT National Transportation Integrated Search

    1997-08-01

    An experimental construction method was evaluated at the Lost River Bridge in Klamath County to reduce the discontinuity between the bridge and the roadway. The method included combining soil in six 300-mm lifts interlaced with geotextile reinforceme...

  3. Monitoring calculation of closure change of Extradosed Cable-stayed Bridge

    NASA Astrophysics Data System (ADS)

    Shi, Jing Xian; Ran, Zhi Hong

    2018-06-01

    During the construction of extradosed cable-stayed bridge in Yunnan province, China, the construction unit has made certain changes in the construction process of the closure section due to environmental restrictions: remove the hanging basket after the closure, the sling shall not be provided in closure section, the function of the sling is realized by the hanging basket on the 16th beam. In case of this change, the bridge has been constructed to section 15th. In order to ensure the smooth and orderly progress of each stage in the closure phase, this article is arranged according to the construction plan, appropriate adjustment of related procedures, checking the bridge safety at all stages of construction, the stress and force of the main girder are compared to ensure the safety of the construction after closure changes. Adjust the height of the beam of the 16th and 17th to adapt the new construction plan, and the bridge closure smoothly.

  4. Finite element analysis of the Wolf Creek multispan curved girder bridge.

    DOT National Transportation Integrated Search

    2008-01-01

    The use of curved girder bridges in highway construction has grown steadily during the last 40 years. Today, roughly 25% of newly constructed bridges have a curved alignment. Curved girder bridges have numerous complicating geometric features that di...

  5. Recommendations for design, construction, and maintenance of bridge approach slabs.

    DOT National Transportation Integrated Search

    2012-09-01

    Settlement and heave related movements of bridge approach slabs relative to bridge decks create a bump in : the roadway. Several problems arise from these bumps, which include poor riding conditions, potential : vehicle damage, loss of vehicle contro...

  6. Wind Tunnel Measurements for Flutter of a Long-Afterbody Bridge Deck

    PubMed Central

    Chen, Zeng-Shun; Zhang, Cheng; Wang, Xu; Ma, Cun-Ming

    2017-01-01

    Bridges are an important component of transportation. Flutter is a self-excited, large amplitude vibration, which may lead to collapse of bridges. It must be understood and avoided. This paper takes the Jianghai Channel Bridge, which is a significant part of the Hong Kong-Zhuhai-Macao Bridge, as an example to investigate the flutter of the bridge deck. Firstly, aerodynamic force models for flutter of bridges were introduced. Then, wind tunnel tests of the bridge deck during the construction and the operation stages, under different wind attack angles and wind velocities, were carried out using a high frequency base balance (HFBB) system and laser displacement sensors. From the tests, the static aerodynamic forces and flutter derivatives of the bridge deck were observed. Correspondingly, the critical flutter wind speeds of the bridge deck were determined based on the derivatives, and they are compared with the directly measured flutter speeds. Results show that the observed derivatives are reasonable and applicable. Furthermore, the critical wind speeds in the operation stage is smaller than those in the construction stage. Besides, the flutter instabilities of the bridge in the construction and the operation stages are good. This study helps guarantee the design and the construction of the Jianghai Channel Bridge, and advances the understanding of flutter of long afterbody bridge decks. PMID:28208773

  7. Wind Tunnel Measurements for Flutter of a Long-Afterbody Bridge Deck.

    PubMed

    Chen, Zeng-Shun; Zhang, Cheng; Wang, Xu; Ma, Cun-Ming

    2017-02-09

    Bridges are an important component of transportation. Flutter is a self-excited, large amplitude vibration, which may lead to collapse of bridges. It must be understood and avoided. This paper takes the Jianghai Channel Bridge, which is a significant part of the Hong Kong-Zhuhai-Macao Bridge, as an example to investigate the flutter of the bridge deck. Firstly, aerodynamic force models for flutter of bridges were introduced. Then, wind tunnel tests of the bridge deck during the construction and the operation stages, under different wind attack angles and wind velocities, were carried out using a high frequency base balance (HFBB) system and laser displacement sensors. From the tests, the static aerodynamic forces and flutter derivatives of the bridge deck were observed. Correspondingly, the critical flutter wind speeds of the bridge deck were determined based on the derivatives, and they are compared with the directly measured flutter speeds. Results show that the observed derivatives are reasonable and applicable. Furthermore, the critical wind speeds in the operation stage is smaller than those in the construction stage. Besides, the flutter instabilities of the bridge in the construction and the operation stages are good. This study helps guarantee the design and the construction of the Jianghai Channel Bridge, and advances the understanding of flutter of long afterbody bridge decks.

  8. 20. San FranciscoOakland Bay Bridge contract recipients, April 28, 1933, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. San Francisco-Oakland Bay Bridge contract recipients, April 28, 1933, photographer unknown. Standing, left to right: Edward J. Schneider, Columbia Steel Corporation; C.C. Horton, Healy-Tibbitts Construction Company; Henry J. Kaiser, Bridge Builders, Inc.; Albert Huber, Clinton Construction Company; Allan McDonald, Transbay Construction Company; C.C. Carleton, Chief, Division of Contracts and Rights of Way, California Department of Public Works. Seated, left to right: Henry J. Brunnier, Consulting Engineer, Member of Consulting Board, San Francisco-Oakland Bay Bridge; Charles E. Andrew, Bridge Engineer, San Francisco-Oakland Bay Bridge; Earl Lee Kelly, Director, California Department of Public Works; Harrison S. Robinson, President, Financial ... - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

  9. Field instrumentation and measured response of the I-295 cable-stayed bridge : interim report on construction measurements in deck segments.

    DOT National Transportation Integrated Search

    1991-01-01

    During the construction of the I-295 cable-stayed bridge, an extensive array of mechanical strain gage points were installed in sections of the box girders, pylons, and piers. At each instrumented box girder section, five longitudinal gages were plac...

  10. Electron Lens Construction for the Integrable Optics Test Accelerator at Fermilab

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    McGee, Mike; Carlson, Kermit; Nobrega, Lucy

    The Integrable Optics Test Accelerator (IOTA) is proposed for operation at Fermilab. The goal of IOTA is to create practical nonlinear accelerator focusing systems with a large frequency spread and stable particle motion. The IOTA is a 40 m circumference, 150 MeV (e-), 2.5 MeV (p⁺) diagnostic test ring. Construction of an electron lens for IOTA is necessary for both electron and proton operation. Components required for the Electron Lens design include; a 0.8 T conventional water-cooled main solenoid, and magnetic bending and focusing elements. The foundation of the design relies on repurposing the Fermilab Tevatron Electron Lens II (TELII)more » gun and collector under ultra-high vacuum (UHV) conditions.« less

  11. Two-course bonded concrete bridge deck construction : interim report no. 2, concrete properties and deck condition prior to opening to traffic.

    DOT National Transportation Integrated Search

    1976-01-01

    Presented in this report is information concerning the characteristics of the concretes used to construct six experimental two-course bonded bridge decks in Virginia. The quality of the overlay concretes produced under standard specifications supplem...

  12. Multi-temporal SAR interferometry reveals acceleration of bridge sinking before collapse

    NASA Astrophysics Data System (ADS)

    Sousa, J. J.; Bastos, L.

    2013-03-01

    On the night of 4 March 2001, at Entre-os-Rios (Northern Portugal), the Hintze Ribeiro centennial bridge collapsed killing 59 people traveling in a bus and three cars that were crossing the Douro River. According to the national authorities, the collapse was due to two decades of uncontrolled sand extraction which compromised the stability of the bridge's pillars, together with underestimating the warnings from divers and technicians. In this work we do not intend to corroborate or contradict the official version of the accident's causes, but only demonstrate the potential of Multi-Temporal Interferometric techniques for detection and monitoring of deformations in structures such as bridges, and consequently the usefulness of the derived information in some type of early warning system to help prevent new catastrophic events. Based on the analysis of 52 ERS-1/2 covering the period from May 1995 to the fatal occurrence, we were able to detect significant movements, reaching rates of 20 mm yr-1, in the section of the bridge that fell into the Douro River, which are obvious signs of the bridge's instability. These promising results demonstrate that with the new high-resolution synthetic aperture radar satellite scenes it is possible to develop interferometric based methodologies for structural health monitoring.

  13. A beamline systems model for Accelerator-Driven Transmutation Technology (ADTT) facilities

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Todd, A.M.M.; Paulson, C.C.; Peacock, M.A.

    1995-10-01

    A beamline systems code, that is being developed for Accelerator-Driven Transmutation Technology (ADTT) facility trade studies, is described. The overall program is a joint Grumman, G.H. Gillespie Associates (GHGA) and Los Alamos National Laboratory effort. The GHGA Accelerator Systems Model (ASM) has been adopted as the framework on which this effort is based. Relevant accelerator and beam transport models from earlier Grumman systems codes are being adapted to this framework. Preliminary physics and engineering models for each ADTT beamline component have been constructed. Examples noted include a Bridge Coupled Drift Tube Linac (BCDTL) and the accelerator thermal system. A decisionmore » has been made to confine the ASM framework principally to beamline modeling, while detailed target/blanket, balance-of-plant and facility costing analysis will be performed externally. An interfacing external balance-of-plant and facility costing model, which will permit the performance of iterative facility trade studies, is under separate development. An ABC (Accelerator Based Conversion) example is used to highlight the present models and capabilities.« less

  14. A beamline systems model for Accelerator-Driven Transmutation Technology (ADTT) facilities

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Todd, Alan M. M.; Paulson, C. C.; Peacock, M. A.

    1995-09-15

    A beamline systems code, that is being developed for Accelerator-Driven Transmutation Technology (ADTT) facility trade studies, is described. The overall program is a joint Grumman, G. H. Gillespie Associates (GHGA) and Los Alamos National Laboratory effort. The GHGA Accelerator Systems Model (ASM) has been adopted as the framework on which this effort is based. Relevant accelerator and beam transport models from earlier Grumman systems codes are being adapted to this framework. Preliminary physics and engineering models for each ADTT beamline component have been constructed. Examples noted include a Bridge Coupled Drift Tube Linac (BCDTL) and the accelerator thermal system. Amore » decision has been made to confine the ASM framework principally to beamline modeling, while detailed target/blanket, balance-of-plant and facility costing analysis will be performed externally. An interfacing external balance-of-plant and facility costing model, which will permit the performance of iterative facility trade studies, is under separate development. An ABC (Accelerator Based Conversion) example is used to highlight the present models and capabilities.« less

  15. Review on antibacterial characteristics of bridge engineering biomaterials.

    PubMed

    Zhao, Qing-Qing; Chen, Meng-Yao; He, Rui-Lin; Zhang, Zhong-Feng; Ashraf, Muhammad Aqeel

    2016-01-01

    This review summarizes the research on timber construction materials used in bridge construction. It focuses on the application of antiseptic treatments and the use of timber engineering materials in decks and bridges. This review also provides an overview on the future research and prospects of engineered timber materials.

  16. Accelerated bridge construction and structural move : workshop.

    DOT National Transportation Integrated Search

    2014-03-01

    The Michigan Department of Transportation (MDOT) is committed to provide the highest level of safety and : mobility during each step of a projects development and delivery. To fulfil the above commitment, MDOT : embraces technology and uses innova...

  17. Construction comparison of Louisiana's conventional and alternative base courses under accelerated loading : final report.

    DOT National Transportation Integrated Search

    2001-11-01

    This report describes the test results of the first project at the Louisiana Transportation Research Center's Accelerated Loading Facility (ALF). In 1995, 9 test lanes were constructed at the Louisiana Pavement Research Facility in Port Allen. These ...

  18. 77 FR 25080 - Safety Zones; TriMet Bridge Project, Willamette River, Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-27

    ...-AA00 Safety Zones; TriMet Bridge Project, Willamette River, Portland, OR AGENCY: Coast Guard, DHS... trestles and construction cranes involved in the construction of the TriMet Bridge on the Willamette River... project. These safety zones replace the prior safety zones established for the TriMet Bridge construction...

  19. Structural Impact of Construction Loads

    DOT National Transportation Integrated Search

    2012-08-01

    Numerous bridge construction accidents have occurred across the country because of construction loadings, which are an underemphasized : topic in many DOT specifications and design manuals. Bridge girders are least stable when they are subjected to c...

  20. Structural Impact of Construction Loads

    DOT National Transportation Integrated Search

    2012-08-01

    Numerous bridge construction accidents have occurred across the country because of construction loadings, which are an underemphasized topic in many DOT specifications and design manuals. Bridge girders are least stable when they are subjected to con...

  1. Covered Bridge Security Manual

    Treesearch

    Brett Phares; Terry Wipf; Ryan Sievers; Travis Hosteng

    2013-01-01

    The design, construction, and use of covered timber bridges is all but a lost art in these days of pre-stressed concrete, high-performance steel, and the significant growth both in the volume and size of vehicles. Furthermore, many of the existing covered timber bridges are preserved only because of their status on the National Registry of Historic Places or the...

  2. Morphological aspects of myocardial bridges.

    PubMed

    Lujinović, Almira; Kulenović, Amela; Kapur, Eldan; Gojak, Refet

    2013-11-01

    Although some myocardial bridges can be asymptomatic, their presence often causes coronary disease either through direct compression of the "tunnel" segment or through stimulation and accelerated development of atherosclerosis in the segment proximally to the myocardial bridge. The studied material contained 30 human hearts received from the Department of Anatomy. The hearts were preserved 3 to 5 days in 10% formalin solution. Thereafter, the fatty tissue was removed and arterial blood vessels prepared by careful dissection with special reference to the presence of the myocardial bridges. Length and thickness of the bridges were measured by the precise electronic caliper. The angle between the myocardial bridge fibre axis and other axis of the crossed blood vessel was measured by a goniometer. The presence of the bridges was confirmed in 53.33% of the researched material, most frequently (43.33%) above the anterior interventricular branch. The mean length of the bridges was 14.64 ± 9.03 mm and the mean thickness was 1.23 ± 1.32 mm. Myocardial bridge fibres pass over the descending blood vessel at the angle of 10-90 degrees. The results obtained on a limited sample suggest that the muscular index of myocardial bridge is the highest for bridges located on RIA, but that the difference is not significant in relation to bridges located on other branches. The results obtained suggest that bridges located on other branches, not only those on RIA, could have a great contractive power and, consequently, a great compressive force, which would be exerted on the wall of a crossed blood vessel.

  3. Structural Impact of Construction Loads : [Technical Summary

    DOT National Transportation Integrated Search

    2012-01-01

    Numerous bridge construction accidents have occurred : because of construction loadings, which are an underemphasized : topic in many specifications and design : manuals. Bridge girders are least stable during the : construction phase, so it is impor...

  4. 25 CFR 170.507 - Who reviews bridge inspection reports?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 25 Indians 1 2011-04-01 2011-04-01 false Who reviews bridge inspection reports? 170.507 Section... ROADS PROGRAM Planning, Design, and Construction of Indian Reservation Roads Program Facilities Bridge Inspection § 170.507 Who reviews bridge inspection reports? The person responsible for the bridge inspection...

  5. Developmental Summer Bridge Programs. What Works Clearinghouse™ Intervention Report

    ERIC Educational Resources Information Center

    What Works Clearinghouse, 2015

    2015-01-01

    Developmental summer bridge programs are designed to reduce the need for developmental education in college by providing students with accelerated instruction in areas where additional knowledge and skills are needed to help them succeed in higher education. The WWC identified one study of developmental summer bridge programs that meets WWC…

  6. Structural Impact of Construction Loads : [Technical Summary

    DOT National Transportation Integrated Search

    2012-01-01

    Numerous bridge construction accidents have occurred because of construction loadings, which are an underemphasized topic in many specifications and design manuals. Bridge girders are least stable during the construction phase, so it is important for...

  7. Establishment of a National Accelerator Facility: Design and construction phase

    NASA Astrophysics Data System (ADS)

    1981-06-01

    The main components of an accelerator facility for nuclear physics, isotope production, and radiotherapy in South Africa are in 8-MeV solid pole injector cyclotron and a separated sector cyclotron with a k-value of 200 MeV. Progress made in the development of the light ion injector and in the design of the control and beam transport systems is described. Mechanical and engineering tasks associated with component manufacture are discussed as well as the construction of the building to house the facility and the installation of necessary services.

  8. Object Markers at Narrow Bridges on Low Volume Rural Roadways

    DOT National Transportation Integrated Search

    1998-09-01

    Bridges are a necessary part of any roadway system. Their construction requires a more sophisticated engineering design analysis and a higher construction cost than that for the roadways connecting them. Until relatively recently, bridge width on low...

  9. 1. VIEW OF SOUTH ELEVATION OF NOTRE DANE BRIDGE, SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    1. VIEW OF SOUTH ELEVATION OF NOTRE DANE BRIDGE, SHOWING CAUSEWAY, STEEL ARCH, AND EASTBOUND LANE OF NEW BRIDGE UNDER CONSTRUCTION, PARALLELING CAUSEWAY, LOOKING NORTHWEST - Notre Dame Bridge, Spanning Merrimack River on Bridge Street, Manchester, Hillsborough County, NH

  10. Evaluation of a highway bridge constructed using high strength lightweight concrete bridge girders.

    DOT National Transportation Integrated Search

    2011-04-01

    The use of high performance concretes to provide longer bridge spans has been limited due to the capacity of existing infrastructure to handle the load of the girders during transportation. The use of High Strength Lightweight Concrete (HSLW) can pro...

  11. Guidelines For The Use, Design, And Construction Of Bridge Approach Slabs

    DOT National Transportation Integrated Search

    1999-11-01

    Differential settlement at the roadway/bridge interface typically results in an abrupt grade change, causing driver discomfort impairing driver safety, and exerting potentially excessive impact traffic loading on the abutment. Bridge approach slabs a...

  12. Chapter 10:Hardwoods for timber bridges

    Treesearch

    James P. Wacker; Ed T. Cesa

    2005-01-01

    This chapter describes the joint efforts of the Forest Service and the FHWA to administer national programs including research, demonstration bridges, and technology transfer components. Summary information on a number of Forest Service-WIT demonstration bridges constructed with hardwoods is also provided.

  13. Field instrumentation and measured response of the I-295 cable-stayed bridge : interim report on construction period strains in cable stays.

    DOT National Transportation Integrated Search

    1991-01-01

    During the construction of the I-295 cable-stayed bridge, a number of the stays on the main span cantilever were instrumented with electrical resistance strain gages mounted directly on the wires of the seven-wire strands making up the stay cables. M...

  14. 77 FR 38723 - Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-29

    ...-AA00 Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR AGENCY: Coast Guard, DHS... effect throughout the duration of the construction and renewal of the Sellwood Bridge located on the... the construction area while transiting in the vicinity of the Sellwood Bridge project; however, the...

  15. 77 FR 15009 - Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-14

    ...-AA00 Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR AGENCY: Coast Guard, DHS... zones to remain in effect throughout the duration of the construction and renewal of the Sellwood Bridge... safe distance from the construction area while transiting in the vicinity of the Sellwood Bridge...

  16. 77 FR 14970 - Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-03-14

    ...-AA00 Safety Zones; Sellwood Bridge Project, Willamette River; Portland, OR AGENCY: Coast Guard, DHS... effect throughout the duration of the construction and renewal of the Sellwood Bridge on the Willamette... construction area while transiting in the vicinity of the Sellwood Bridge project; however, the establishment...

  17. Building Bridges One Line at a Time

    ERIC Educational Resources Information Center

    Grigsby, Cathy Murray

    2012-01-01

    In this article, first-grade students were taught the different kinds of lines that were part of the construction of various bridges--the curved lines of the arches of stone bridges, straight lines connecting the cables of a suspension bridge, vertical lines, horizontal lines, and so on. They gained practice in drawing structures and in fine brush…

  18. Long-term behavior of integral abutment bridges : [technical summary].

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment bridges, a type of jointless bridge, are the construction option of choice when designing highway bridges in many parts of the country. Rather than providing an expansion joint to separate the substructure from the superstructure to...

  19. Aesthetic coatings for steel bridge components.

    DOT National Transportation Integrated Search

    2013-11-01

    The effectiveness of aesthetic coating systems for steel bridges was studied. Twelve 2-coat, 3-coat, and duplex : coating systems were selected and subjected to a series of accelerated weathering and mechanical tests to : determine their performance....

  20. Bridge deck resurfacing using Rosphalt 50 : construction report.

    DOT National Transportation Integrated Search

    2003-01-01

    Most bridge decks in Maine are comprised of Reinforced Portland Cement Concrete (RPCC). Although a : durable product, RPCC is permeable and susceptible to chloride penetration leading to corrosion of the : steel reinforcement and eventual cracking of...

  1. Evaluation of cracking of the US 331 bridge deck.

    DOT National Transportation Integrated Search

    2010-08-01

    The focus of this report is a three-span, continuous, skewed bridge that was constructed in the : summer of 2003 as the northbound roadway bridge on US 331 in Montgomery County, : Alabama. This bridge deck exhibited extensive transverse and horizonta...

  2. Study of technology of pile foundation construction of no.5 main pier of Shoujiang bridge in Wenchuan County

    NASA Astrophysics Data System (ADS)

    Huang, Xianbin; Liu, Chenyang; Chen, Chunyang; Wangren, Yahong; Xu, Jialin; Xian, Jin

    2018-03-01

    The group of pile foundation of no.5 pier in Shoujiang Bridge needs to overcome the big load of large span continuous steel structure. The length of single pile foundation is 77m and the diameter of single pile foundation is 250cm. It not only faces the flood in the upstream of Shoujiang river, the construction obstacles during summer rain period, but also the reservoir clearance activity of Zipingpu reservoir and the high water level in winter and other water level fluctuation that have huge impact on platform of pile foundation construction. This article introduces the preparation in aspect of personnel, material, equipment and so on of pile foundation construction, and also conduct intensive research on leveling the field, assaying pile location, the embedment of the steel casing, installing the drill, mixing mud, drilling, final hole inspection and clearance, steel cage construction, perfusing concrete under water.

  3. A forecast of bridge engineering, 1980-2000.

    DOT National Transportation Integrated Search

    1979-01-01

    A three-pronged study was undertaken to forecast the nature of bridge engineering and construction for the years 1980 to 2000. First, the history of bridge engineering was explored to extrapolate likely future developments. Second, a detailed questio...

  4. Innovative concrete bridging systems for pedestrian bridges : implementation and monitoring.

    DOT National Transportation Integrated Search

    2013-08-01

    Two precast, prestressed pedestrian bridges were designed for rapid construction in Rolla, MO, utilizing high-strength concrete (HSC) : and high-strength self-consolidating concrete (HS-SCC) with a target 28 day compressive strength of 68.9 MPa (10,0...

  5. "Bridge #6 Rock Creek: Castiron 48" pipe lines to ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    "Bridge #6 - Rock Creek: Cast-iron 48" pipe lines to Gravity - 1859." Construction photo of Pennsylvania Avenue Bridge, 1859. Photograph courtesy Washington Aqueduct Division, U.S. Army Corps of Engineers - Pennsylvania Avenue Bridge, Spanning Rock Creek & Potomac Parkway, Washington, District of Columbia, DC

  6. The influence of carbonation process on concrete bridges and durability in Estonian practice

    NASA Astrophysics Data System (ADS)

    Liisma, E.; Sein, S.; Järvpõld, M.

    2017-10-01

    Concrete as one of the most widely used construction material in building industry, has considerable implementing in bridge engineering due to its extensive number of effective technical characteristics. However, according to exploitation environment, there are substantial factors such as aggressive liquids (e.g. deiced salts, sulfates, etc), rapid temperature alterations and the increasing rate of CO2 to take into account predicting actual retained service life of concrete structure and the need of repairmen to increase the lifespan of the bridge. According to several measuring, concentration of atmospheric CO2 is reported linearly increasing and is modeled to appear as exponential increase in the next decade. This environmental influence leads to accelerated carbonation process of concrete and brings up the importance of its potential untimely degradation mechanism. Hence, the main aim of this research is to give an analyzed overview of the carbonation depths of selection of 11 concrete bridges in Estonia built in the period of 1976-2007 and their relation with compressive strength of concrete. In addition to in situ tests, laboratory research was performed to understand natural carbonation rate and compressive strength relations of concrete.

  7. Use of innovative concrete mixes for improved constructability and sustainability of bridge decks.

    DOT National Transportation Integrated Search

    2013-11-01

    Bridge deck crack surveys were performed on twelve bridges on US-59 south of Lawrence, Kansas, to determine the effects of : mixture proportions, concrete properties, deck type, and girder type on the crack density of reinforced concrete bridge decks...

  8. Investigations of a precast bridge deck system.

    DOT National Transportation Integrated Search

    2010-07-01

    Improved methods of bridge deck construction are greatly needed. Bridge decks are often the first element to require repair or replacement because of its direct exposure to the elements and tire wear. This report presents a new precast overhang syste...

  9. In-service performance monitoring of a CFRP reinforced HPC bridge deck.

    DOT National Transportation Integrated Search

    2010-08-01

    The Rollins Road Bridge in Rollinsford, New Hampshire was constructed in part with funding from the FHWAs Innovative Bridge Research and Construction (IBRC) program and opened to traffic in December, 2000. A requirement of the IBRC program is the ...

  10. Comparison of properties of fresh and hardened concrete in bridge decks.

    DOT National Transportation Integrated Search

    1971-01-01

    A study was made on 17 bridge decks constructed in 1963 under regular construction procedures. The purpose was (1) to compare important properties of concrete as freshly placed in randomly selected bridge decks with those after hardening of the concr...

  11. U.S. Geological Survey - Virginia Department of Transportation: Bridge scour pilot study

    USGS Publications Warehouse

    Austin, Samuel H.

    2018-02-27

    BackgroundCost effective and safe highway bridge designs are required to ensure the long-term sustainability of Virginia’s road systems. The streamflows that, over time, scour streambed sediments from bridge piers inherently affect bridge safety and design costs. To ensure safety, bridge design must anticipate streambed scour at bridge piers over the lifespan of a bridge. Until recently Federal Highway Administration (FHWA) guidance provided only for scour estimates of granular, noncohesive, highly erosive material yielding overestimates of scour potential in instances when streambed materials offer some resistance to scour. This study seeks to estimate stream power and streambed scour for these more resistive sites, with bridge piers potentially established in cohesive soil or erodible rock. This new knowledge may provide significant construction cost savings while ensuring design and construction of safe highway bridges.

  12. Design Optimization of Hybrid FRP/RC Bridge

    NASA Astrophysics Data System (ADS)

    Papapetrou, Vasileios S.; Tamijani, Ali Y.; Brown, Jeff; Kim, Daewon

    2018-04-01

    The hybrid bridge consists of a Reinforced Concrete (RC) slab supported by U-shaped Fiber Reinforced Polymer (FRP) girders. Previous studies on similar hybrid bridges constructed in the United States and Europe seem to substantiate these hybrid designs for lightweight, high strength, and durable highway bridge construction. In the current study, computational and optimization analyses were carried out to investigate six composite material systems consisting of E-glass and carbon fibers. Optimization constraints are determined by stress, deflection and manufacturing requirements. Finite Element Analysis (FEA) and optimization software were utilized, and a framework was developed to run the complete analyses in an automated fashion. Prior to that, FEA validation of previous studies on similar U-shaped FRP girders that were constructed in Poland and Texas is presented. A finer optimization analysis is performed for the case of the Texas hybrid bridge. The optimization outcome of the hybrid FRP/RC bridge shows the appropriate composite material selection and cross-section geometry that satisfies all the applicable Limit States (LS) and, at the same time, results in the lightest design. Critical limit states show that shear stress criteria determine the optimum design for bridge spans less than 15.24 m and deflection criteria controls for longer spans. Increased side wall thickness can reduce maximum observed shear stresses, but leads to a high weight penalty. A taller cross-section and a thicker girder base can efficiently lower the observed deflections and normal stresses. Finally, substantial weight savings can be achieved by the optimization framework if base and side-wall thickness are treated as independent variables.

  13. Bridges Dynamic Parameters Identification Based On Experimental and Numerical Method Comparison in Regard with Traffic Seismicity

    NASA Astrophysics Data System (ADS)

    Krkošková, Katarína; Papán, Daniel; Papánová, Zuzana

    2017-10-01

    The technical seismicity negatively affects the environment, buildings and structures. Technical seismicity means seismic shakes caused by force impulse, random process and unnatural origin. The vibration influence on buildings is evaluated in the Eurocode 8 in Slovak Republic, however, the Slovak Technical Standard STN 73 0036 includes solution of the technical seismicity. This standard also classes bridges into the group of structures that are significant in light of the technical seismicity - the group “U”. Using the case studies analysis by FEM simulation and comparison is necessary because of brief norm evaluation of this issue. In this article, determinate dynamic parameters by experimental measuring and numerical method on two real bridges are compared. First bridge, (D201 - 00) is Scaffold Bridge on the road I/11 leading to the city of Čadca and is situated in the city of Žilina. It is eleven - span concrete road bridge. The railway is the obstacle, which this bridge spans. Second bridge (M5973 Brodno) is situated in the part of Žilina City on the road of I/11. It is concrete three - span road bridge built as box girder. The computing part includes 3D computational models of the bridges. First bridge (D201 - 00) was modelled in the software of IDA Nexis as the slab - wall model. The model outputs are natural frequencies and natural vibration modes. Second bridge (M5973 Brodno) was modelled in the software of VisualFEA. The technical seismicity corresponds with the force impulse, which was put into this model. The model outputs are vibration displacements, velocities and accelerations. The aim of the experiments was measuring of the vibration acceleration time record of bridges, and there was need to systematic placement of accelerometers. The vibration acceleration time record is important during the under - bridge train crossing, about the first bridge (D201 - 00) and the vibration acceleration time domain is important during deducing the force

  14. Aerial view of the entire bridge crossing the Tennessee River ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Aerial view of the entire bridge crossing the Tennessee River looking up river. The swing bridge, when open, permits river navigational traffic to ply the river. Construction of a replacement bridge, to be located 93.27 feet down river, has now started. - Bridgeport Swing Span Bridge, Spanning Tennessee River, Bridgeport, Jackson County, AL

  15. Soil-structure interaction studies for understanding the behavior of integral abutment bridges.

    DOT National Transportation Integrated Search

    2012-03-01

    Integral Abutment Bridges (IAB) are bridges without any joints within the bridge deck or between the : superstructure and the abutments. An IAB provides many advantages during construction and maintenance of : a bridge. Soil-structure interactions at...

  16. 76 FR 25278 - Safety Zone; TriMet Bridge Project, Willamette River; Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-04

    ...-AA00 Safety Zone; TriMet Bridge Project, Willamette River; Portland, OR AGENCY: Coast Guard, DHS... safety zone during the construction of the TriMet Bridge on the Willamette River, in Portland, OR. This..., will be starting construction of the new Portland-Milwaukie Light Rail Bridge on July 1, 2011 (with in...

  17. Activation of accelerator construction materials by heavy ions

    NASA Astrophysics Data System (ADS)

    Katrík, P.; Mustafin, E.; Hoffmann, D. H. H.; Pavlovič, M.; Strašík, I.

    2015-12-01

    Activation data for an aluminum target irradiated by 200 MeV/u 238U ion beam are presented in the paper. The target was irradiated in the stacked-foil geometry and analyzed using gamma-ray spectroscopy. The purpose of the experiment was to study the role of primary particles, projectile fragments, and target fragments in the activation process using the depth profiling of residual activity. The study brought information on which particles contribute dominantly to the target activation. The experimental data were compared with the Monte Carlo simulations by the FLUKA 2011.2c.0 code. This study is a part of a research program devoted to activation of accelerator construction materials by high-energy (⩾200 MeV/u) heavy ions at GSI Darmstadt. The experimental data are needed to validate the computer codes used for simulation of interaction of swift heavy ions with matter.

  18. Investigation of using shrinking method in construction of Institute for Research in Fundamental Sciences Electron Linear Accelerator TW-tube (IPM TW-Linac tube)

    NASA Astrophysics Data System (ADS)

    Ghasemi, F.; Abbasi Davani, F.

    2015-06-01

    Due to Iran's growing need for accelerators in various applications, IPM's electron Linac project has been defined. This accelerator is a 15 MeV energy S-band traveling-wave accelerator which is being designed and constructed based on the klystron that has been built in Iran. Based on the design, operating mode is π /2 and the accelerating chamber consists of two 60cm long tubes with constant impedance and a 30cm long buncher. Amongst all construction methods, shrinking method is selected for construction of IPM's electron Linac tube because it has a simple procedure and there is no need for large vacuum or hydrogen furnaces. In this paper, different aspects of this method are investigated. According to the calculations, linear ratio of frequency alteration to radius change is 787.8 MHz/cm, and the maximum deformation at the tube wall where disks and the tube make contact is 2.7μ m. Applying shrinking method for construction of 8- and 24-cavity tubes results in satisfactory frequency and quality factor. Average deviations of cavities frequency of 8- and 24-cavity tubes to the design values are 0.68 MHz and 1.8 MHz respectively before tune and 0.2 MHz and 0.4 MHz after tune. Accelerating tubes, buncher, and high power couplers of IPM's electron linac are constructed using shrinking method.

  19. 21. c, 1915 Historic plan, standard 2 beam girder bridge. ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    21. c, 1915 Historic plan, standard 2 beam girder bridge. United Construction Company, Albany, New York. Generic plan typical of Prescott Bridge. Source: New Hampshire Department of Transportation - Prescott Bridge, Spanning Lamprey River on Prescott Road, Raymond, Rockingham County, NH

  20. NHDOT : process for municipally-managed state bridge aid program projects

    DOT National Transportation Integrated Search

    2007-09-12

    The document sets for the requirements for a municipality which to manage the design and construction of a bridge rehabilitation or replacement project and receive Bridge Aid under the applicable provisions of RSA 234. Bridge Aid provided to a Munici...

  1. Standard plans for southern pine bridges

    Treesearch

    P. D. Hilbrich Lee; M. A. Ritter; M. H. Triche

    1995-01-01

    The development of standardized timber bridge plans and specifications is a key element in improving design and construction practices. The bridge plans presented were developed as a cooperative effort between the USDA Forest Service, Forest Products Laboratory (FPL); the University of Alabama; and the Southern Pine Council and are the first step in developing...

  2. 77 FR 43557 - Safety Zone; Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-25

    ...-AA00 Safety Zone; Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and... during the Gilmerton Bridge Center Span Float- in and bridge construction of span placement. This action... Construction, INC will facilitate removal of the existing bascule spans from the Gilmerton Bridge, transport of...

  3. Hydraulic analysis of the Schoharie Creek bridge

    USGS Publications Warehouse

    Froehlich, David C.; Trent, Roy E.

    1989-01-01

    Ten people died on April 5, 1987 as a result of the collapse of two spans of a New York State Thruway bridge into the floodwaters of Schoharie Creek. The cause of the bridge failure was determined to be scour of bed material from under the foundations of piers supporting the bridge. To evaluate the hydraulic conditions that produced the scour, a two-dimensional finite element surface-water flow model was constructed. The model was used to obtain a detailed description of water-surface elevations and depth-averaged velocities within a reach that extends from about 4000 ft downstream of the bridge to about 6000 ft upstream of the bridge.

  4. Probabilistic seismic hazard assessment for the effect of vertical ground motions on seismic response of highway bridges

    NASA Astrophysics Data System (ADS)

    Yilmaz, Zeynep

    Typically, the vertical component of the ground motion is not considered explicitly in seismic design of bridges, but in some cases the vertical component can have a significant effect on the structural response. The key question of when the vertical component should be incorporated in design is answered by the probabilistic seismic hazard assessment study incorporating the probabilistic seismic demand models and ground motion models. Nonlinear simulation models with varying configurations of an existing bridge in California were considered in the analytical study. The simulation models were subjected to the set of selected ground motions in two stages: at first, only horizontal components of the motion were applied; while in the second stage the structures were subjected to both horizontal and vertical components applied simultaneously and the ground motions that produced the largest adverse effects on the bridge system were identified. Moment demand in the mid-span and at the support of the longitudinal girder and the axial force demand in the column are found to be significantly affected by the vertical excitations. These response parameters can be modeled using simple ground motion parameters such as horizontal spectral acceleration and vertical spectral acceleration within 5% to 30% error margin depending on the type of the parameter and the period of the structure. For a complete hazard assessment, both of these ground motion parameters explaining the structural behavior should also be modeled. For the horizontal spectral acceleration, Abrahamson and Silva (2008) model was used within many available standard model. A new NGA vertical ground motion model consistent with the horizontal model was constructed. These models are combined in a vector probabilistic seismic hazard analyses. Series of hazard curves developed and presented for different locations in Bay Area for soil site conditions to provide a roadmap for the prediction of these features for future

  5. Building a Straw Bridge

    ERIC Educational Resources Information Center

    Teaching Science, 2015

    2015-01-01

    This project is for a team of students (groups of two or three are ideal) to design and construct a model of a single-span bridge, using plastic drinking straws as the building material. All steps of the design, construction, testing and critiquing stages should be recorded by students in a journal. Students may like to include labelled diagrams,…

  6. Operational Modal Analysis of Bridge Structures with Data from GNSS/Accelerometer Measurements.

    PubMed

    Xiong, Chunbao; Lu, Huali; Zhu, Jinsong

    2017-02-23

    Real-time dynamic displacement and acceleration responses of the main span section of the Tianjin Fumin Bridge in China under ambient excitation were tested using a Global Navigation Satellite System (GNSS) dynamic deformation monitoring system and an acceleration sensor vibration test system. Considering the close relationship between the GNSS multipath errors and measurement environment in combination with the noise reduction characteristics of different filtering algorithms, the researchers proposed an AFEC mixed filtering algorithm, which is an combination of autocorrelation function-based empirical mode decomposition (EMD) and Chebyshev mixed filtering to extract the real vibration displacement of the bridge structure after system error correction and filtering de-noising of signals collected by the GNSS. The proposed AFEC mixed filtering algorithm had high accuracy (1 mm) of real displacement at the elevation direction. Next, the traditional random decrement technique (used mainly for stationary random processes) was expanded to non-stationary random processes. Combining the expanded random decrement technique (RDT) and autoregressive moving average model (ARMA), the modal frequency of the bridge structural system was extracted using an expanded ARMA_RDT modal identification method, which was compared with the power spectrum analysis results of the acceleration signal and finite element analysis results. Identification results demonstrated that the proposed algorithm is applicable to analyze the dynamic displacement monitoring data of real bridge structures under ambient excitation and could identify the first five orders of the inherent frequencies of the structural system accurately. The identification error of the inherent frequency was smaller than 6%, indicating the high identification accuracy of the proposed algorithm. Furthermore, the GNSS dynamic deformation monitoring method can be used to monitor dynamic displacement and identify the modal

  7. 20. GENERAL VIEW OF CONSTRUCTION LOOKING NORTHEAST SHOWING THE CONSTRUCTION ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    20. GENERAL VIEW OF CONSTRUCTION LOOKING NORTHEAST SHOWING THE CONSTRUCTION BRIDGE, GANTRY CRANE AND STRUCTURAL PIERS. - Wilson Dam & Hydroelectric Plant, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

  8. Serviceability-related issues for bridge live load deflection and construction closure pours.

    DOT National Transportation Integrated Search

    2015-06-01

    This study investigated the design criteria and practices in an effort to improve the quality of bridge designs in the : State of Maryland and beyond. This first criterion investigated was the live load deflection for steel bridges. The : second desi...

  9. Structural monitoring of Rigolets Pass Bridge : LTRC technical summary report 437.

    DOT National Transportation Integrated Search

    2009-09-01

    The Louisiana Department of Transportation and Development (LADOTD) has been gradually : introducing high performance concrete (HPC) into their bridge construction programs. The : Rigolets Pass Bridge is a 62-span bridge with a total length of 5,489 ...

  10. Long-term behavior of integral abutment bridges : appendix B, SR18 over the Mississinewa River Bridge soil borings.

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand thei...

  11. Long-term behavior of integral abutment bridges : appendix E, INDOT design manual : selected recommendations for integral abutment bridges.

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand thei...

  12. Fabry-Perot sensors for the monitoring of FRP reinforced bridge decks

    NASA Astrophysics Data System (ADS)

    Benmokrane, Brahim; Quirion, Marco; El-Salakawy, Ehab; Debaiky, Ahmed S.; Lackey, Tom

    2004-07-01

    The extensive use of deicing salts in Canada during winter times is identified as the main reason behind the deterioration of highway bridges and parking garages. To fight this infrastructure crisis, Fibre Reinforced Polymers (FRP) has become a very attractive alternative to traditional reinforcing steel due to their non-corrosive nature and light weight. The replacement of steel with Glass FRP bars in bridge deck slabs has been extensively researched in the last few years. This paper presents the first efforts to implement these bars in two highway bridges in Quebec, Canada, and Vermont, USA. These projects are aimed to prove the feasibility of using GFRP bars in bridge construction. GFRP bars were used as reinforcement for parts of the deck slabs in the two bridges while traditional steel was used in the remaining parts. Fibre Optic Sensors (FOS) were used to measure strains in the concrete, reinforcing bars and steel girders. The sensors were surface mounted on the bars or steel girders using standard glue, or embedded in concrete. Static and dynamic testing of the bridges was done using loaded trucks placed for maximum stresses. The design, construction, testing, and results obtained from the bridges are briefly outlined in this paper. The results indicated the accuracy of the sensors and their feasibility for bridge construction and remote monitoring.

  13. Vibration analysis of the Second Saikai Bridge—a concrete filled tubular (CFT) arch bridge

    NASA Astrophysics Data System (ADS)

    Yoshimura, Mistuhiro; Wu, Qingxiong; Takahashi, Kazuo; Nakamura, Shozo; Furukawa, Kazuyoshi

    2006-02-01

    Concrete-filled steel tubular (CFT) arch bridges have been rapidly developing in China since 1990. Research has focused on the static behavior, thermal stress and erection technique, however, and there has been very little research of natural vibrations and dynamic responses of these bridges. Japan's first CFT arch bridge in highway bridges, the Second Saikai Bridge, is now under construction in Nagasaki Prefecture. Furthermore, this bridge has a pedestrian bridge that is suspended under the girder, which is rare. Therefore, the natural vibration properties are examined, and the influence of pedestrian bridge structure on the natural vibration of main bridge is discussed first. Response analysis under a moving vehicle and pedestrian is carried out, and the response characteristics and response level are clarified. The natural vibrations and responses are compared to those of CFT arch bridges that have been constructed in China. Results show the fine performance of both main bridge and pedestrian bridge of the Second Saikai Bridge.

  14. Human-simulated intelligent control of train braking response of bridge with MRB

    NASA Astrophysics Data System (ADS)

    Li, Rui; Zhou, Hongli; Wu, Yueyuan; Wang, Xiaojie

    2016-04-01

    The urgent train braking could bring structural response menace to the bridge under passive control. Based on the analysis of breaking dynamics of a train-bridge vibration system, a magnetorheological elastomeric bearing (MRB) whose mechanical parameters are adjustable is designed, tested and modeled. A finite element method (FEM) is carried out to model and optimize a full scale vibration isolation system for railway bridge based on MRB. According to the model above, we also consider the effect of different braking stop positions on the vibration isolation system and classify the bridge longitudinal vibration characteristics into several cases. Because the train-bridge vibration isolation system has multiple vibration states and strongly coupling with nonlinear characteristics, a human-simulated intelligent control (HSIC) algorithm for isolating the bridge vibration under the impact of train braking is proposed, in which the peak shear force of pier top, the displacement of beam and the acceleration of beam are chosen as control goals. The simulation of longitudinal vibration control system under the condition of train braking is achieved by MATLAB. The results indicate that different braking stop positions significantly affect the vibration isolation system and the structural response is the most drastic when the train stops at the third cross-span. With the proposed HSIC smart isolation system, the displacement of bridge beam and peak shear force of pier top is reduced by 53.8% and 34.4%, respectively. Moreover, the acceleration of bridge beam is effectively controlled within limited range.

  15. Bridging Disciplinary Boundaries

    ERIC Educational Resources Information Center

    Mei, Linda

    2009-01-01

    Interdisciplinary education promotes the unity of knowledge by bridging the cultural divide between the social constructs of disciplines and encourages the development of knowledge to enhance society. As an inquiry-based and relevant approach that expands and advances knowledge, interdisciplinary education facilitates creativity and flexibility,…

  16. Long-term behavior of integral abutment bridges.

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical : highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To : expand ...

  17. Bridging the Gap: An Impact Study of Eight Developmental Summer Bridge Programs in Texas. NCPR Brief

    ERIC Educational Resources Information Center

    Barnett, Elisabeth A.; Bork, Rachel Hare; Mayer, Alexander K.; Pretlow, Joshua; Wathington, Heather D.; Weiss, Madeline Joy

    2012-01-01

    Across the country, a growing number of recent high school graduates are participating in summer bridge programs. These programs provide accelerated and focused learning opportunities in order to help students acquire the knowledge and skills needed for college success. The state of Texas has given particular attention to summer programs as a way…

  18. 3. DEADWOOD CREEK BRIDGE, VIEW BELOW DECK SHOWING OPEN SPANDREL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    3. DEADWOOD CREEK BRIDGE, VIEW BELOW DECK SHOWING OPEN SPANDREL ARCH CONSTRUCTION AND ARCH RIBS - Deadwood Creek Bridge, Spanning Deadwood Creek on Mather Memorial Parkway, Longmire, Pierce County, WA

  19. Evaluation of a Highway Bridge Constructed Using High Strength Lightweight Concrete Bridge Girders : final report.

    DOT National Transportation Integrated Search

    2011-04-01

    The use of high performance concretes to provide longer bridge spans has been limited due to the capacity of existing infrastructure to handle the load of the girders during transportation. The use of High Strength Lightweight Concrete (HSLW) can pro...

  20. Information-theoretical noninvasive damage detection in bridge structures

    NASA Astrophysics Data System (ADS)

    Sudu Ambegedara, Amila; Sun, Jie; Janoyan, Kerop; Bollt, Erik

    2016-11-01

    Damage detection of mechanical structures such as bridges is an important research problem in civil engineering. Using spatially distributed sensor time series data collected from a recent experiment on a local bridge in Upper State New York, we study noninvasive damage detection using information-theoretical methods. Several findings are in order. First, the time series data, which represent accelerations measured at the sensors, more closely follow Laplace distribution than normal distribution, allowing us to develop parameter estimators for various information-theoretic measures such as entropy and mutual information. Second, as damage is introduced by the removal of bolts of the first diaphragm connection, the interaction between spatially nearby sensors as measured by mutual information becomes weaker, suggesting that the bridge is "loosened." Finally, using a proposed optimal mutual information interaction procedure to prune away indirect interactions, we found that the primary direction of interaction or influence aligns with the traffic direction on the bridge even after damaging the bridge.

  1. Investigation of Aerodynamic Interference between Twin Deck Bridges

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Sitek, M. A.; Bojanowski, C.; Lottes, S. A.

    2016-05-01

    Construction of a twin bridge can be a cost effective and minimally disruptive way to increase capacity when an existing bridge is not near the end of its service life. With ever growing vehicular traffic, when demand approaches the capacity of many existing roads and bridges. Remodeling a structure with an insufficient number of lanes can be a good solution in case of smaller and less busy bridges. Closing down or reducing traffic on crossings of greater importance for the construction period, however, can result in major delays and revenue loss for commerce and transportation as well as increasing themore » traffic load on alternate route bridges. Multiple-deck bridges may be the answer to this issue. A parallel deck can be built next to the existing one, without reducing the flow. Additionally, a new bridge can be designed as a twin or multi-deck structure. Several such structures have been built throughout the United States, among them: - The New NY Bridge Project - the Tappan Zee Hudson River Crossing, - SR-182 Columbia River Bridge, - The Thaddeus Kosciusko Bridge (I-87), - The Allegheny River Bridge, Pennsylvania, which carries I76, - Fred Hartman Bridge, TX, see Figure 1.2. With a growing number of double deck bridges, additional, more detailed, studies on the interaction of such bridge pairs in windy conditions appears appropriate. Aerodynamic interference effects should be examined to assure the aerodynamic stability of both bridges. There are many studies on aerodynamic response of single deck bridges, but the literature on double-deck structures is not extensive. The experimental results from wind tunnels are still limited in number, as a parametric study is required, they can be very time consuming. Literature review shows that some investigation of the effects of gap-width and angle of wind incidence has been done. Most of the CFD computational studies that have been done were limited to 2D simulations. Therefore, it is desirable to investigate twin

  2. Microsilica modified concrete for bridge deck overlays : construction report.

    DOT National Transportation Integrated Search

    1990-10-01

    The study objective was to see if microsilica concrete (MC) is a viable alternative to the latex modified concrete (LMC) usually used on bridge deck overlays in Oregon. The study addresses MC overlays placed in 1989 on Portland cement concrete (PCC) ...

  3. Wireless sensing system for bridge condition assessment and health monitoring

    NASA Astrophysics Data System (ADS)

    Gangone, Michael V.; Whelan, Matthew J.; Janoyan, Kerop D.

    2009-03-01

    Discussed in this paper is the deployment of a universal and low-cost dense wireless sensor system for structural monitoring, load rating and condition assessment of bridges. The wireless sensor system developed is designed specifically for diagnostic bridge monitoring, providing independent conditioning for both accelerometers and strain transducers in addition to high-rate wireless data transmission. The system was field deployed on a three span simply supported bridge superstructure, where strain and acceleration measurements were obtained simultaneously and in realtime at critical locations under several loading conditions, providing reliable quantitative information as to the actual performance level of the bridge. Monitoring was also conducted as the bridge was subjected to various controlled damage scenarios on the final day of testing. Select cases of detected damage using strain and modal based analysis are presented.

  4. 17. Baltimore through truss steel bridge (1905), built by the ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    17. Baltimore through truss steel bridge (1905), built by the American Bridge Company. The bridge is 15 to 20 feet wide, with a wooden deck, and connects the Sullivan Machine Co. with the Foundry. The enclosed bridge in the background was constructed ca. 1920, and connects the Chain Machine Building with its power plant, foundry, and pattern shop. - Sullivan Machinery Company, Main Street between Pearl & Water Streets, Claremont, Sullivan County, NH

  5. Three Bridge Fryer's Ford Bridge, Nimrod Bridge, and Ward's ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Three Bridge - Fryer's Ford Bridge, Nimrod Bridge, and Ward's Crossing Bridge - Fryer's Ford Bridge, Spanning East Fork of Point Remove Creek at Fryer Bridge Road (CR 67), Solgohachia, Conway County, AR

  6. Field performance of stress-laminated highway bridges constructed with glued laminated timber

    Treesearch

    J.P. Wacker

    2004-01-01

    This paper summarizes the field performance of three stress-laminated deck timber bridges located in Wisconsin, New York, and Arizona. The deck superstructures of these single-span highway bridges is comprised of full-span glued laminated timber (glulam) beam laminations manufactured with southern pine, hem fir/red maple combination, and/or Douglas fir lumber species....

  7. Integral abutment bridge for Louisiana's soft and stiff soils.

    DOT National Transportation Integrated Search

    2016-03-01

    Integral abutment bridges (IABs) have been designed and constructed in a few US states in the past few : decades. The initial purpose of building such bridges was to eliminate the expansion joints and resolve the : joint-induced problems. Although IA...

  8. Fatigue study of a GRP pedestrian bridge : final report.

    DOT National Transportation Integrated Search

    1986-01-01

    Static and cyclic load tests were conducted on a 16-ft long bridge constructed with fiberglass materials. Approximately 1.6 million cycles of loads were applied to the deck to study the fatigue characteristics of the bridge. The location and magnitud...

  9. Long-term performance monitoring of hardwood timber bridges in Pennsylvania

    Treesearch

    James P. Wacker; Carlito Calil; Lola E. Hislop; Paula D. Hilbrich Lee; James A. Kainz

    2004-01-01

    Several hardwood timber bridges were constructed in Pennsylvania during the early 1990s. This report summarizes the long-term field performance of seven stress-laminated deck bridges over a 4-year period beginning August 1997 and ending July 2001. Data collected include lumber moisture content, static load test deflection measurements, and bridge condition assessments...

  10. 33 CFR 1.01-60 - Delegations for issuance of bridge permits.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... bridge permits. 1.01-60 Section 1.01-60 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... bridge permits. (a) The Commandant delegates to the Deputy Commandant for Operations (CG-DCO), the authority to issue the following permits for the construction, reconstruction, or alteration of bridges...

  11. 33 CFR 1.01-60 - Delegations for issuance of bridge permits.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... bridge permits. 1.01-60 Section 1.01-60 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF... bridge permits. (a) The Commandant delegates to the Deputy Commandant for Operations (CG-DCO), the authority to issue the following permits for the construction, reconstruction, or alteration of bridges...

  12. Evaluation and analysis of decked bulb T beam bridges.

    DOT National Transportation Integrated Search

    2015-03-01

    A new corrosion-free decked bulb T beam bridge system has been developed to overcome some of the problems : associated with the construction of side-by-side box beam bridges such as the lack of inspection space between : beams and the longitudinal de...

  13. Operational Modal Analysis of Bridge Structures with Data from GNSS/Accelerometer Measurements

    PubMed Central

    Xiong, Chunbao; Lu, Huali; Zhu, Jinsong

    2017-01-01

    Real-time dynamic displacement and acceleration responses of the main span section of the Tianjin Fumin Bridge in China under ambient excitation were tested using a Global Navigation Satellite System (GNSS) dynamic deformation monitoring system and an acceleration sensor vibration test system. Considering the close relationship between the GNSS multipath errors and measurement environment in combination with the noise reduction characteristics of different filtering algorithms, the researchers proposed an AFEC mixed filtering algorithm, which is an combination of autocorrelation function-based empirical mode decomposition (EMD) and Chebyshev mixed filtering to extract the real vibration displacement of the bridge structure after system error correction and filtering de-noising of signals collected by the GNSS. The proposed AFEC mixed filtering algorithm had high accuracy (1 mm) of real displacement at the elevation direction. Next, the traditional random decrement technique (used mainly for stationary random processes) was expanded to non-stationary random processes. Combining the expanded random decrement technique (RDT) and autoregressive moving average model (ARMA), the modal frequency of the bridge structural system was extracted using an expanded ARMA_RDT modal identification method, which was compared with the power spectrum analysis results of the acceleration signal and finite element analysis results. Identification results demonstrated that the proposed algorithm is applicable to analyze the dynamic displacement monitoring data of real bridge structures under ambient excitation and could identify the first five orders of the inherent frequencies of the structural system accurately. The identification error of the inherent frequency was smaller than 6%, indicating the high identification accuracy of the proposed algorithm. Furthermore, the GNSS dynamic deformation monitoring method can be used to monitor dynamic displacement and identify the modal

  14. 6. BRIDGE LOOKING SOUTH FROM CROWN POINT STATE PARK SHOWING ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. BRIDGE LOOKING SOUTH FROM CROWN POINT STATE PARK SHOWING SURROUNDING DEVELOPMENT FROM CONSTRUCTION OF DAM - Columbia River Bridge at Grand Coulee Dam, Spanning Columbia River at State Route 155, Coulee Dam, Okanogan County, WA

  15. 6. VIEW FACING EAST ALONG NORTH FACE OF BRIDGE AT ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW FACING EAST ALONG NORTH FACE OF BRIDGE AT CONSTRUCTION DETAILS OF WOOD RAILINGS AND STONE ABUTMENTS. - South Fork Tuolumne River Bridge, Spanning South Fork Tuolumne River on Tioga Road, Mather, Tuolumne County, CA

  16. Semiconductor acceleration sensor

    NASA Astrophysics Data System (ADS)

    Ueyanagi, Katsumichi; Kobayashi, Mitsuo; Goto, Tomoaki

    1996-09-01

    This paper reports a practical semiconductor acceleration sensor especially suited for automotive air bag systems. The acceleration sensor includes four beams arranged in a swastika structure. Two piezoresistors are formed on each beam. These eight piezoresistors constitute a Wheatstone bridge. The swastika structure of the sensing elements, an upper glass plate and a lower glass plate exhibit the squeeze film effect which enhances air dumping, by which the constituent silicon is prevented from breakdown. The present acceleration sensor has the following features. The acceleration force component perpendicular to the sensing direction can be cancelled. The cross-axis sensitivity is less than 3 percent. And, the erroneous offset caused by the differences between the thermal expansion coefficients of the constituent materials can be canceled. The high aspect ratio configuration realized by plasma etching facilitates reducing the dimensions and improving the sensitivity of the acceleration sensor. The present acceleration sensor is 3.9 mm by 3.9 mm in area and 1.2 mm in thickness. The present acceleration sensor can measure from -50 to +50 G with sensitivity of 0.275 mV/G and with non-linearity of less than 1 percent. The acceleration sensor withstands shock of 3000 G.

  17. Kings Covered Bridge rehabilitation, Somerset County, PA

    Treesearch

    William J. Collins; David C. Fischetti; Arnold M. Jr. Graton; Len Lichvar; Branden Diehl; James P. Wacker; Ed Cesa; Ed Stoltz; Emory L. Kemp; Samer H. Petro; Leon Buckwalter; John McNamara

    2005-01-01

    Kings Covered Bridge over Laurel Creek in Somerset County, Pennsylvania is approximately 114-foot clear span multiple Kingpost Truss with nail-laminated arches. This timber bridge is historically significant because it retains its original features of the 1860’s since the 1930s when it was spared from modernization by the construction of an adjacent steel highway...

  18. Longer Lasting Bridge Deck Overlays

    DOT National Transportation Integrated Search

    2018-04-01

    The objective of this report is to determine the most effective method for bridge deck overlay construction and repair by assessing current practices; examining new products and technologies; and reviewing NCHRP (National Cooperative Highway Research...

  19. Use of innovative concrete mixes for improved constructability and sustainability of bridge decks : [technical summary].

    DOT National Transportation Integrated Search

    2013-11-01

    Bridge deck crack surveys were performed on twelve bridges on US-59 south of Lawrence, Kansas, to determine the effects of mixture proportions, concrete properties, deck type, and girder type on the crack density of reinforced concrete bridge decks.

  20. Material characterization of field-cast connection grouts.

    DOT National Transportation Integrated Search

    2013-01-01

    Accelerated bridge construction methods can help increase safety and minimize the inconveniences to the traveling public. Many new construction methods have been investigated and implemented using prefabricated subassemblies on bridges. These methods...

  1. Investigation of cause of cracked stringer on the Blanchette Bridge.

    DOT National Transportation Integrated Search

    2006-10-05

    The Blanchette Bridge carries Interstate 70 across the Missouri River, connecting St. Louis and St. Charles : counties in eastern Missouri. The westbound bridge was constructed in 1958. In 1979, the original : reinforced concrete roadway deck on the ...

  2. Structural health monitoring of Lindquist bridge

    NASA Astrophysics Data System (ADS)

    Sargent, D. D.; Murison, E. R.; Bakht, B.; Mufti, A. A.

    2007-04-01

    Many forestry bridges in Canada are typically single-lane, single span structures with two steel plate girders and a deck comprising of precast reinforced concrete panels. The concept of arching in deck slabs was utilized in the steel-free precast panels used in the Lindquist Bridge in British Columbia, Canada. The panels were completely devoid of tensile reinforcement and transverse confinement to the panels was provided by external steel straps. After the bridge was constructed in 1998, electrical strain gauges were installed on the girders and straps. Static and dynamic load tests were performed. The cracks on the top and bottom of the deck were mapped in 1999 and 2003. In 2006, a load test and crack mapping were performed on the bridge. The strain readings in the straps were compared with the data obtained 8 years prior. After analysis of the strain gauge readings, conclusions were drawn on the performance of the bridge. The cracks were formed to accommodate arching action and it was concluded that the bridge is still performing as it was designed.

  3. Structural Bridges through Fold Space.

    PubMed

    Edwards, Hannah; Deane, Charlotte M

    2015-09-01

    Several protein structure classification schemes exist that partition the protein universe into structural units called folds. Yet these schemes do not discuss how these units sit relative to each other in a global structure space. In this paper we construct networks that describe such global relationships between folds in the form of structural bridges. We generate these networks using four different structural alignment methods across multiple score thresholds. The networks constructed using the different methods remain a similar distance apart regardless of the probability threshold defining a structural bridge. This suggests that at least some structural bridges are method specific and that any attempt to build a picture of structural space should not be reliant on a single structural superposition method. Despite these differences all representations agree on an organisation of fold space into five principal community structures: all-α, all-β sandwiches, all-β barrels, α/β and α + β. We project estimated fold ages onto the networks and find that not only are the pairings of unconnected folds associated with higher age differences than bridged folds, but this difference increases with the number of networks displaying an edge. We also examine different centrality measures for folds within the networks and how these relate to fold age. While these measures interpret the central core of fold space in varied ways they all identify the disposition of ancestral folds to fall within this core and that of the more recently evolved structures to provide the peripheral landscape. These findings suggest that evolutionary information is encoded along these structural bridges. Finally, we identify four highly central pivotal folds representing dominant topological features which act as key attractors within our landscapes.

  4. Long term monitoring of carbon composite strands in the Penobscot-Narrows bridge.

    DOT National Transportation Integrated Search

    2015-06-01

    The Penobscot-Narrows Bridge was constructed between May 2003 and December 2006. The bridge is a cable-stayed design with twin pylons and a 2,120-foot span. This cable-stayed bridge features a cradle stay system that : allows for each cable strand in...

  5. 7. DETAIL VIEW OF BRIDGE DATEPLATE WHICH READS '1929, WHITE ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. DETAIL VIEW OF BRIDGE DATEPLATE WHICH READS '1929, WHITE RIVER BRIDGE, BUILT BY ARKANSAS HIGHWAY COMMISSION, DWIGHT BLACKWOOD, CHAIRMAN, JUSTIN MATTHEWS, J. LAN WILLIAMS, J.S. PARKS, SAM J. WILSON, COMMISSIONERS, C.S. CHRISTIAN, STATE HIGHWAY ENGINEER, IRA HEDRICK, INC., CONSULTING ENGINEERS, LIST & WEATHERLY, CONSTRUCTION CO.' - Newport Bridge, Spanning White River at State Highway 14, Newport, Jackson County, AR

  6. 25 CFR 170.507 - Who reviews bridge inspection reports?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 25 Indians 1 2010-04-01 2010-04-01 false Who reviews bridge inspection reports? 170.507 Section 170.507 Indians BUREAU OF INDIAN AFFAIRS, DEPARTMENT OF THE INTERIOR LAND AND WATER INDIAN RESERVATION ROADS PROGRAM Planning, Design, and Construction of Indian Reservation Roads Program Facilities Bridge...

  7. Application of Composite Structures in Bridge Engineering. Problems of Construction Process and Strength Analysis

    NASA Astrophysics Data System (ADS)

    Flaga, Kazimierz; Furtak, Kazimierz

    2015-03-01

    Steel-concrete composite structures have been used in bridge engineering from decades. This is due to rational utilisation of the strength properties of the two materials. At the same time, the reinforced concrete (or prestressed) deck slab is more favourable than the orthotropic steel plate used in steel bridges (higher mass, better vibration damping, longer life). The most commonly found in practice are composite girder bridges, particularly in highway bridges of small and medium spans, but the spans may reach over 200 m. In larger spans steel truss girders are applied. Bridge composite structures are also employed in cable-stayed bridge decks of the main girder spans of the order of 600, 800 m. The aim of the article is to present the cionstruction process and strength analysis problems concerning of this type of structures. Much attention is paid to the design and calculation of the shear connectors characteristic for the discussed objects. The authors focused mainly on the issues of single composite structures. The effect of assembly states on the stresses and strains in composite members are highlighted. A separate part of problems is devoted to the influence of rheological factors, i.e. concrete shrinkage and creep, as well as thermal factors on the stresses and strains and redistribution of internal forces.

  8. Assessment and maintenance of a 15 year old stress-laminated timber bridge

    Treesearch

    T. Russell Gentry; Karl N. Brohammer; John Wells; James P. Wacker

    2006-01-01

    A timber bridge consisting of three 6.7 meter spans with a stress laminated deck was constructed in 1991 in the Spirit Creek State Forest near August, Georgia, USA. The stress laminated bridge uses a series of post-tensioning bars to hold the laminations together. The bridge remained in service until 2001 with no maintenance, at which time the bridge was inspected,...

  9. 0-6652 : spliced Texas girder bridges.

    DOT National Transportation Integrated Search

    2015-02-01

    Spliced girder technology continues to attract : attention due to its versatility over traditional : prestressed concrete highway bridge construction. : By joining multiple precast concrete girders using : post-tensioning, spliced girder technology :...

  10. Lateral Bracing of Bridge Girders by Permanent Metal Deck Forms

    DOT National Transportation Integrated Search

    2005-01-10

    Lateral torsional buckling is a failure mode that often controls the design of steel bridge girders during construction. Bracing in the form of cross-frames and diaphragms are often provided at locations along the bridge length to reduce the unbraced...

  11. First muon acceleration using a radio-frequency accelerator

    NASA Astrophysics Data System (ADS)

    Bae, S.; Choi, H.; Choi, S.; Fukao, Y.; Futatsukawa, K.; Hasegawa, K.; Iijima, T.; Iinuma, H.; Ishida, K.; Kawamura, N.; Kim, B.; Kitamura, R.; Ko, H. S.; Kondo, Y.; Li, S.; Mibe, T.; Miyake, Y.; Morishita, T.; Nakazawa, Y.; Otani, M.; Razuvaev, G. P.; Saito, N.; Shimomura, K.; Sue, Y.; Won, E.; Yamazaki, T.

    2018-05-01

    Muons have been accelerated by using a radio-frequency accelerator for the first time. Negative muonium atoms (Mu- ), which are bound states of positive muons (μ+) and two electrons, are generated from μ+'s through the electron capture process in an aluminum degrader. The generated Mu- 's are initially electrostatically accelerated and injected into a radio-frequency quadrupole linac (RFQ). In the RFQ, the Mu- 's are accelerated to 89 keV. The accelerated Mu- 's are identified by momentum measurement and time of flight. This compact muon linac opens the door to various muon accelerator applications including particle physics measurements and the construction of a transmission muon microscope.

  12. Random vibration analysis of train-bridge under track irregularities and traveling seismic waves using train-slab track-bridge interaction model

    NASA Astrophysics Data System (ADS)

    Zeng, Zhi-Ping; Zhao, Yan-Gang; Xu, Wen-Tao; Yu, Zhi-Wu; Chen, Ling-Kun; Lou, Ping

    2015-04-01

    The frequent use of bridges in high-speed railway lines greatly increases the probability that trains are running on bridges when earthquakes occur. This paper investigates the random vibrations of a high-speed train traversing a slab track on a continuous girder bridge subjected to track irregularities and traveling seismic waves by the pseudo-excitation method (PEM). To derive the equations of motion of the train-slab track-bridge interaction system, the multibody dynamics and finite element method models are used for the train and the track and bridge, respectively. By assuming track irregularities to be fully coherent random excitations with time lags between different wheels and seismic accelerations to be uniformly modulated, non-stationary random excitations with time lags between different foundations, the random load vectors of the equations of motion are transformed into a series of deterministic pseudo-excitations based on PEM and the wheel-rail contact relationship. A computer code is developed to obtain the time-dependent random responses of the entire system. As a case study, the random vibration characteristics of an ICE-3 high-speed train traversing a seven-span continuous girder bridge simultaneously excited by track irregularities and traveling seismic waves are analyzed. The influence of train speed and seismic wave propagation velocity on the random vibration characteristics of the bridge and train are discussed.

  13. New Signal Amplification Strategy Using Semicarbazide as Co-reaction Accelerator for Highly Sensitive Electrochemiluminescent Aptasensor Construction.

    PubMed

    Ma, Meng-Nan; Zhuo, Ying; Yuan, Ruo; Chai, Ya-Qin

    2015-11-17

    A highly sensitive electrochemiluminescent (ECL) aptasensor was constructed using semicarbazide (Sem) as co-reaction accelerator to promote the ECL reaction rate of CdTe quantum dots (CdTe QDs) and the co-reactant of peroxydisulfate (S2O8(2-)) for boosting signal amplification. The co-reaction accelerator is a species that when it is introduced into the ECL system containing luminophore and co-reactant, it can interact with co-reactant rather than luminophore to promote the ECL reaction rate of luminophore and co-reactant; thus the ECL signal is significantly amplified in comparison with that in which only luminophore and co-reactant are present. In this work, the ECL signal probes were first fabricated by alternately assembling the Sem and Au nanoparticles (AuNPs) onto the surfaces of hollow Au nanocages (AuNCs) via Au-N bond to obtain the multilayered nanomaterials of (AuNPs-Sem)n-AuNCs for immobilizing amino-terminated detection aptamer of thrombin (TBA2). Notably, the Sem with two -NH2 terminal groups could not only serve as cross-linking reagent to assemble AuNPs and AuNCs but also act as co-reaction accelerator to enhance the ECL reaction rate of CdTe QDs and S2O8(2-) for signal amplification. With the sandwich-type format, TBA2 signal probes could be trapped on the CdTe QD-based sensing interface in the presence of thrombin (TB) to achieve a considerably enhanced ECL signal in S2O8(2-) solution. As a result, the Sem in the TBA2 signal probes could accelerate the reduction of S2O8(2-) to produce the more oxidant mediators of SO4(•-), which further boosted the production of excited states of CdTe QDs to emit light. With the employment of the novel co-reaction accelerator Sem, the proposed ECL biosensor exhibited ultrahigh sensitivity to quantify the concentration of TB from 1 × 10(-7) to 1 nM with a detection limit of 0.03 fM, which demonstrated that the co-reaction accelerator could provide a simple, efficient, and low-cost approach for signal

  14. 78 FR 4331 - Safety Zone; Sellwood Bridge Move; Willamette River, Portland, OR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-22

    ... 1625-AA00 Safety Zone; Sellwood Bridge Move; Willamette River, Portland, OR AGENCY: Coast Guard, DHS... the Sellwood Bridge, located on the Willamette River in Portland, Oregon, while it is being relocated 66 feet downriver as part of the new Sellwood Bridge construction project. This action is necessary...

  15. 19. Photographer unknown, circa 1950 'THE LOOP OVER' BRIDGE WAS ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    19. Photographer unknown, circa 1950 'THE LOOP OVER' BRIDGE WAS CONSTRUCTED ON NEWFOUND GAP ROAD TO REPLACE A SERIES OF DANGEROUS SWITCHBACKS. THIS ENGINEERING FEATURE QUICKLY BECAME A POPULAR TOURIST ATTRACTION. - Great Smoky Mountains National Park Roads & Bridges, Gatlinburg, Sevier County, TN

  16. Clock synchronization by accelerated observers - Metric construction for arbitrary congruences of world lines

    NASA Technical Reports Server (NTRS)

    Henriksen, R. N.; Nelson, L. A.

    1985-01-01

    Clock synchronization in an arbitrarily accelerated observer congruence is considered. A general solution is obtained that maintains the isotropy and coordinate independence of the one-way speed of light. Attention is also given to various particular cases including, rotating disk congruence or ring congruence. An explicit, congruence-based spacetime metric is constructed according to Einstein's clock synchronization procedure and the equation for the geodesics of the space-time was derived using Hamilton-Jacobi method. The application of interferometric techniques (absolute phase radio interferometry, VLBI) to the detection of the 'global Sagnac effect' is also discussed.

  17. Integral abutment bridges under thermal loading : numerical simulations and parametric study.

    DOT National Transportation Integrated Search

    2016-06-01

    Integral abutment bridges (IABs) have become of interest due to their decreased construction and maintenance costs in : comparison to conventional jointed bridges. Most prior IAB research was related to substructure behavior, and, as a result, most :...

  18. Field evaluation of hybrid-composite girder bridges in Missouri.

    DOT National Transportation Integrated Search

    2014-08-01

    Three hybrid composite beam (HCB) bridges were recently constructed in Missouri, USA. HCB is an innovative idea that incorporates traditional construction materials (steel and concrete) with fiber reinforced polymer (FRP) composites in such a manner ...

  19. 23 CFR 661.53 - What standards should be used for bridge design?

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 23 Highways 1 2011-04-01 2011-04-01 false What standards should be used for bridge design? 661.53... TRAFFIC OPERATIONS INDIAN RESERVATION ROAD BRIDGE PROGRAM § 661.53 What standards should be used for bridge design? (a) Replacement—A replacement structure must meet the current geometric, construction and...

  20. 23 CFR 661.53 - What standards should be used for bridge design?

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false What standards should be used for bridge design? 661.53... TRAFFIC OPERATIONS INDIAN RESERVATION ROAD BRIDGE PROGRAM § 661.53 What standards should be used for bridge design? (a) Replacement—A replacement structure must meet the current geometric, construction and...

  1. ABC deck panel testing.

    DOT National Transportation Integrated Search

    2013-09-01

    Accelerated Bridge Construction techniques have resulted in innovative options that : save time and money during the construction of bridges. One such group of techniques : that has generated considerable interest is the usage of individual precast c...

  2. Key Royale bridge five year evaluation.

    DOT National Transportation Integrated Search

    2013-06-01

    This report describes the design, construction, instrumentation, and five-year evaluation of the Key Royale Bridge substructure. The primary focus was the evaluation of the implementation of highly reactive supplementary cementitious materials (SCM) ...

  3. Continuity diaphragm for skewed continuous span precast prestressed concrete girder bridges.

    DOT National Transportation Integrated Search

    2004-10-01

    Continuity diaphragms used on skewed bents in prestressed girder bridges cause difficulties in detailing and : construction. Details for bridges with large diaphragm skew angles (>30) have not been a problem for LA DOTD. : However, as the skew angl...

  4. Serviceability-related issues for bridge live load deflection and construction closure pours : [research summary].

    DOT National Transportation Integrated Search

    2015-06-01

    The Load and Resistance Factor Design (LRFD) method has evolved to become a : more reliable approach to bridge design in the past century. Nevertheless, safety is : always the number one concern in the design of bridge structures. Equally important, ...

  5. Forces in wingwalls from thermal expansion of skewed semi-integral bridges.

    DOT National Transportation Integrated Search

    2010-11-01

    Jointless bridges, such as semi-integral and integral bridges, have become more popular in recent years because of their simplicity in the construction and the elimination of high costs related to joint maintenance. Prior research has shown that skew...

  6. Pi'ilani Highway side on south side of island, Manawainui Bridge, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    Pi'ilani Highway side on south side of island, Manawainui Bridge, constructed in 1993 to modern ASHTO standards; note difference in scale with historic Hana Belt Road bridges - Hana Belt Road, Between Haiku and Kaipahulu, Hana, Maui County, HI

  7. Maintenance and design of steel abutment piles in Iowa bridges.

    DOT National Transportation Integrated Search

    2014-09-01

    Soil consolidation and erosion caused by roadway runoff have exposed the upper portions of steel piles at the abutments of : numerous bridges, leaving them susceptible to accelerated corrosion rates due to the abundance of moisture, oxygen, and : chl...

  8. Structural monitoring of Rigolets Pass Bridge.

    DOT National Transportation Integrated Search

    2009-10-01

    The overall objective of this research project was to evaluate the structural behavior of prestressed highperformance : concrete (HPC) long-span bulb-tee girders utilized in Louisiana bridge construction. To : accomplish this objective, one span of t...

  9. Estimation of the full-field dynamic response of a floating bridge using Kalman-type filtering algorithms

    NASA Astrophysics Data System (ADS)

    Petersen, Ø. W.; Øiseth, O.; Nord, T. S.; Lourens, E.

    2018-07-01

    Numerical predictions of the dynamic response of complex structures are often uncertain due to uncertainties inherited from the assumed load effects. Inverse methods can estimate the true dynamic response of a structure through system inversion, combining measured acceleration data with a system model. This article presents a case study of full-field dynamic response estimation of a long-span floating bridge: the Bergøysund Bridge in Norway. This bridge is instrumented with a network of 14 triaxial accelerometers. The system model consists of 27 vibration modes with natural frequencies below 2 Hz, obtained from a tuned finite element model that takes the fluid-structure interaction with the surrounding water into account. Two methods, a joint input-state estimation algorithm and a dual Kalman filter, are applied to estimate the full-field response of the bridge. The results demonstrate that the displacements and the accelerations can be estimated at unmeasured locations with reasonable accuracy when the wave loads are the dominant source of excitation.

  10. Research notes : soil nailing of a bridge fill embankment.

    DOT National Transportation Integrated Search

    1991-11-01

    A recent construction project involved widening and lowering the grade of the Swift Highway under the south end of the Oregon Slough Bridge approximately seven miles north of Portland. This project included construction of the first permanent soil na...

  11. Laser driven ion accelerator

    DOEpatents

    Tajima, Toshiki

    2006-04-18

    A system and method of accelerating ions in an accelerator to optimize the energy produced by a light source. Several parameters may be controlled in constructing a target used in the accelerator system to adjust performance of the accelerator system. These parameters include the material, thickness, geometry and surface of the target.

  12. Assessment of noise environment during construction of a major bridge and associated approach road.

    PubMed

    Roy, T K; Mukhopadhyay, A R; Ghosh, S K; Majumder, G

    2011-10-01

    In this paper a methodology to quantify the noise environment, during a major bridge construction and upgrading approach road connectivity, has been provided. Noise levels were monitored at eleven sites. These eleven sites have been classified into three categories - commercial, residential and silence zones. The study was carried out to measure the ambient noise levels in all the eleven sites falling in the above three categories during both day and night times considering both "working" and "non-working" days. It was found that the mean noise level during night time was more, compared to that during day time for commercial, residential as well as silence zones. The likely causes of more noise during night time have been explored. Appropriate remedial measures have been suggested to reduce the noise levels. In addition, the noise levels in the above three zones have been compared, wherever feasible statistically, with the respective zonal standards. Significance has been found in all the cases. The underlying causes and remedies have been provided.

  13. Application of Artificial Intelligence for Bridge Deterioration Model.

    PubMed

    Chen, Zhang; Wu, Yangyang; Li, Li; Sun, Lijun

    2015-01-01

    The deterministic bridge deterioration model updating problem is well established in bridge management, while the traditional methods and approaches for this problem require manual intervention. An artificial-intelligence-based approach was presented to self-updated parameters of the bridge deterioration model in this paper. When new information and data are collected, a posterior distribution was constructed to describe the integrated result of historical information and the new gained information according to Bayesian theorem, which was used to update model parameters. This AI-based approach is applied to the case of updating parameters of bridge deterioration model, which is the data collected from bridges of 12 districts in Shanghai from 2004 to 2013, and the results showed that it is an accurate, effective, and satisfactory approach to deal with the problem of the parameter updating without manual intervention.

  14. Application of Artificial Intelligence for Bridge Deterioration Model

    PubMed Central

    Chen, Zhang; Wu, Yangyang; Sun, Lijun

    2015-01-01

    The deterministic bridge deterioration model updating problem is well established in bridge management, while the traditional methods and approaches for this problem require manual intervention. An artificial-intelligence-based approach was presented to self-updated parameters of the bridge deterioration model in this paper. When new information and data are collected, a posterior distribution was constructed to describe the integrated result of historical information and the new gained information according to Bayesian theorem, which was used to update model parameters. This AI-based approach is applied to the case of updating parameters of bridge deterioration model, which is the data collected from bridges of 12 districts in Shanghai from 2004 to 2013, and the results showed that it is an accurate, effective, and satisfactory approach to deal with the problem of the parameter updating without manual intervention. PMID:26601121

  15. Glulam timber deck bridges : final report.

    DOT National Transportation Integrated Search

    1979-01-01

    This report discusses the construction and initial condition of the Virginia Department of Highways and Transportation's first three bridges built with glulam panels on steel stringers. The data show that superstructures with glulam deck panels are m...

  16. Quantification of cracks in concrete bridge decks in Ohio District 3.

    DOT National Transportation Integrated Search

    2012-02-01

    The development of cracks in reinforced bridge decks is a critical problem, not only in Ohio state, but the whole of United States. Many bridge decks constructed within the last 10 years in Ohio have already shown varying levels and patterns of crack...

  17. Quantification of cracks in concrete bridge decks in Ohio district 3.

    DOT National Transportation Integrated Search

    2012-02-01

    The development of cracks in reinforced bridge decks is a critical problem, not only in Ohio state, but the whole of United States. Many bridge decks constructed within the last 10 years in Ohio have already shown varying levels and patterns of crack...

  18. Study on the use of self-consolidating concrete on the Interstate 25 bridge replacement in Trinidad, CO.

    DOT National Transportation Integrated Search

    2010-12-01

    As part of a national experiment sponsored by the FHWA under the Innovative Bridge Research and Construction (IBRC) : program, CDOT used self-consolidating concrete (SCC) to construct abutments, piers, and retaining walls on a bridge : replacement pr...

  19. 77 FR 44544 - Safety Zone; Gilmerton Bridge Center Span Float-In, Elizabeth River; Norfolk, Portsmouth, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-30

    ...-AA00 Safety Zone; Gilmerton Bridge Center Span Float-In, Elizabeth River; Norfolk, Portsmouth, and... withdrawing its proposed rule concerning the Gilmerton Bridge Center Span Float-in and bridge construction of... ``Safety Zone; Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and Chesapeake...

  20. Theoretical and field experimental evaluation of skewed modular slab bridges : [research summary].

    DOT National Transportation Integrated Search

    2012-12-01

    Adjacent precast, prestressed concrete multi-beam bridges have become more : prevalent due to their rapid construction time and cost effectiveness. Over the : years, various adjustments and refinements have been made to the design of : these bridges ...

  1. Effect of implementing lean-on bracing in skewed steel I-girder bridges.

    DOT National Transportation Integrated Search

    2016-09-01

    Skew of the supports in steel I-girder bridges cause undesirable torsional effects, increase cross-frame forces, and generally increase the difficulty of designing and : constructing a bridge. The girders experience differential deflections due to th...

  2. Evaluation of stainless steel reinforcement construction project

    DOT National Transportation Integrated Search

    2003-02-01

    Stainless steel reinforcement has greater corrosion resistance than that of the conventional reinforcement. In this project, bridge A6059, the first in Missouri utilizing stainless steel reinforcement in the deck, was constructed, along with bridge A...

  3. 59. Photographic copy of the original construction drawing, 1934, by ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    59. Photographic copy of the original construction drawing, 1934, by Sverdrup and Parcel, Consulting Engineers, from microfilm copy at Bridge Division, Missouri Highway and Transportation Department. Construction changes in pier 7 - Mark Twain Memorial Bridge, Spanning Mississippi River at US Route 36, Hannibal, Marion County, MO

  4. Best Practices for Construction and Repair of Bridge Approaches and Departures

    DOT National Transportation Integrated Search

    2018-03-01

    Florida Department of Transportation (FDOT) has experienced frequent distresses in bridge approach/departure asphalt pavements in its highway system. Commonly observed distresses include alligator cracking and rutting, which reduce roadway smoothness...

  5. Latex and microsilica modified concrete bridge deck overlays in Oregon : final report.

    DOT National Transportation Integrated Search

    1997-05-01

    The final report presents information collected by ODOT personnel from bridge deck overlays constructed in Oregon between 1989 and 1995. Decks were placed on a variety of existing bridge types prepared using hydrodemolition, milling, and diamond grin...

  6. Evaluation of the composite wing girder bridge at Bear Creek.

    DOT National Transportation Integrated Search

    1984-11-01

    This report documents the construction monitoring and subsequent field testing : to evaluate the performance of an innovative nloose-fit" composite post-tensioned : concrete wing girder bridge constructed over Bear Creek, south of Austin, Texas. : Th...

  7. 77 FR 35900 - Safety Zone; Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-15

    ...-AA00 Safety Zone; Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and... navigable waters during the Gilmerton Bridge Center Span Float- in and bridge construction of span placement... the existing bascule spans from the Gilmerton Bridge, transport the new center span from the Eastern...

  8. Live-load performance evaluation of historic covered timber bridges in the United States

    Treesearch

    Junwon Seo; Travis K. Hosteng; Brent M. Phares; James P. Wacker

    2015-01-01

    The National Historic Covered Bridge Preservation Program (NHCBP), sponsored by the Federal Highway Administration (FHWA), was established to preserve the covered timber bridge structures that were constructed in the early 1800s. Today, many of the approximately 880 covered timber bridges still in existence in the United States are closed to vehicular traffic;...

  9. 32. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, April 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). CONSTRUCTION OF SOUTH ARM. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  10. 31. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    31. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, April 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). INITIAL CONSTRUCTION ON SOUTH ARM. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  11. Optimizing Mississippi aggregates for concrete bridge decks.

    DOT National Transportation Integrated Search

    2012-12-01

    AASHTO M 43 Standard Specification for Sizes of Aggregate for Road and Bridge Construction : addresses particle size distribution of material included in various maximum nominal size aggregates. This : particle size distribution requires additi...

  12. Polymeric salt bridges for conducting electric current in microfluidic devices

    DOEpatents

    Shepodd, Timothy J [Livermore, CA; Tichenor, Mark S [San Diego, CA; Artau, Alexander [Humacao, PR

    2009-11-17

    A "cast-in-place" monolithic microporous polymer salt bridge for conducting electrical current in microfluidic devices, and methods for manufacture thereof is disclosed. Polymeric salt bridges are formed in place in capillaries or microchannels. Formulations are prepared with monomer, suitable cross-linkers, solvent, and a thermal or radiation responsive initiator. The formulation is placed in a desired location and then suitable radiation such as UV light is used to polymerize the salt bridge within a desired structural location. Embodiments are provided wherein the polymeric salt bridges have sufficient porosity to allow ionic migration without bulk flow of solvents therethrough. The salt bridges form barriers that seal against fluid pressures in excess of 5000 pounds per square inch. The salt bridges can be formulated for carriage of suitable amperage at a desired voltage, and thus microfluidic devices using such salt bridges can be specifically constructed to meet selected analytical requirements.

  13. I-5/Gilman advanced technology bridge project

    NASA Astrophysics Data System (ADS)

    Lanza di Scalea, Francesco; Karbhari, Vistasp M.; Seible, Frieder

    2000-04-01

    The UCSD led I-5/Gilman Advanced Technology Bridge Project will design and construct a fully functional traffic bridge of advanced composite materials across Interstate 5 in La Jolla, California. Its objective is to demonstrate the use of advanced composite technologies developed by the aerospace industry in commercial applications to increase the life expectancy of new structures and for the rehabilitation of aging infrastructure components. The structure will be a 450 ft long, 60 ft wide cable-stayed bridge supported by a 150 ft A-frame pylon with two vehicular lanes, two bicycle lanes, pedestrian walkways and utility tunnels. The longitudinal girders and pylon will be carbon fiber shells filled with concrete. The transverse deck system will consist of hollow glass/carbon hybrid tubes and a polypropylene fiber reinforced concrete deck with an arch action. Selected cables will be composite. The bridge's structural behavior will be monitored to determine how advanced composite materials perform in civil infrastructure applications. The bridge will be instrumented to obtain performance and structural health data in real time and, where possible, in a remote fashion. The sensors applied to the bridge will include electrical resistance strain gages, fiberoptic Bragg gratings and accelerometers.

  14. Design, construction and testing of the Neal Bridge in Pittsfield, Maine.

    DOT National Transportation Integrated Search

    2009-10-01

    Highway bridges in the US are quickly becoming deficient due to increasing traffic volumes, rapid : deterioration, extended service life, and increasing load requirements. Repair or replacement of deficient : structures is expensive, time and labor i...

  15. Arch-Axis Coefficient Optimization of Long-Span Deck-Type Concrete-Filled Steel Tubular Arch Bridge

    NASA Astrophysics Data System (ADS)

    Liu, Q. J.; Wan, S.; Liu, H. C.

    2017-11-01

    This paper is based on Nanpuxi super major bridge which is under construction and starts from Wencheng Zhejiang province to Taishun highway. A finite element model of the whole bridge is constructed using Midas Civil finite element software. The most adverse load combination in the specification is taken into consideration to determine the method of calculating the arch-axis coefficient of long-span deck-type concrete-filled steel tubular arch bridge. By doing this, this paper aims at providing references for similar engineering projects.

  16. 77 FR 73541 - Safety Zone: Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-11

    ...-AA00 Safety Zone: Gilmerton Bridge Center Span Float-in, Elizabeth River; Norfolk, Portsmouth, and... Gilmerton Bridge Center Span Float- in and bridge construction of span placement. This action is intended to... rulemaking (NPRM) proposing a safety zone in the Gilmerton Bridge Area (77 FR 43557) on September 5-9, 2012...

  17. Performance of two solid fumigants in covered bridges

    Treesearch

    Matthew J. Konkler; Mark A. Newbill; Stan Lebow; Jeffrey J. Morrell

    2017-01-01

    The potential for two solid wood fumigants, dazomet and methylisothiocyanate (MITC), to move through wood at levels sufficient to arrest decay in covered bridges was assessed. Dazomet alone failed to decompose to MITC and move into the wood at effective levels, probably because too little moisture was available for breakdown. Adding a copper accelerant improved dazomet...

  18. Long-term monitoring of a cable stayed bridge using a SCADA system

    NASA Astrophysics Data System (ADS)

    Torbol, Marco; Kim, Sehwan; Shinozuka, Masanobu

    2012-04-01

    DuraMote is a MEMS-based remote sensing system, which is developed for the NIST TIP project, Next Generation SCADA for Prevention and Mitigation of Water System Infrastructure Disaster. It is designed for supervisory control and data acquisition (SCADA) of pipe ruptures in water distribution systems. In this project, a method is developed to detect the pipe ruptures by analyzing the acceleration data gathered by DuraMote which consists of two primary components; the first, "Gopher" contains the accelerometers and are attached to the water pipe surface noninvasively, and the second, "Roocas" is placed above ground supplying the power to, and retrieving the data from the multiple Gophers, and then transmit the data through Wi-Fi to a base station. The relays support the Wi-Fi network to facilitate the transmission. A large scale bridge provides an ideal test-bet to validate the performance of such a complex monitoring system as DuraMote for its accuracy, reliability, robustness, and user friendliness. This is because a large bridge is most of the time subjected to susceptible level of ambient vibration due to passing loads, wind, etc. DuraMote can record the acceleration time history arising from the vibration making it possible to estimate the frequency values of various bridge vibration modes. These estimated frequency values are then compared with the values computed from analytical model of the bridge for the verification of the accuracy of DuraMote. It is noted that such a verification method cannot be used practically by deploying DuraMote on a water distribution network since the dynamic behavior of a pipe network, either above or underground, is too complex to model analytically for this purpose, and in addition, the network generally lacks conveniently recordable ambient vibration. In this experiment, the performance of DuraMote system was tested being installed on the Hwamyung Bridge, a 500 m long RC cable stayed bridge in Korea for long term monitoring. In

  19. 33 CFR 1.01-60 - Delegations for issuance of bridge permits.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... authority to issue the following permits for the construction, reconstruction, or alteration of bridges... Presidential permit and approval under the International Bridge Act of 1972 (33 U.S.C. 535). (3) Those that... local government agencies. (5) Those authorized by the Commandant upon the appeal of a district...

  20. 33 CFR 1.01-60 - Delegations for issuance of bridge permits.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... authority to issue the following permits for the construction, reconstruction, or alteration of bridges... Presidential permit and approval under the International Bridge Act of 1972 (33 U.S.C. 535). (3) Those that... local government agencies. (5) Those authorized by the Commandant upon the appeal of a district...

  1. 33 CFR 1.01-60 - Delegations for issuance of bridge permits.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... authority to issue the following permits for the construction, reconstruction, or alteration of bridges... Presidential permit and approval under the International Bridge Act of 1972 (33 U.S.C. 535). (3) Those that... local government agencies. (5) Those authorized by the Commandant upon the appeal of a district...

  2. 37. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    37. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, ca. July 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). CONSTRUCTION ON THIRD PANEL OF NORTH ARM. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  3. 40. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    40. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, ca. July 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). CONSTRUCTION OF NORTH ARM, FROM SOUTH ARM. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  4. 34. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, ca. May 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). CONSTRUCTION ON EIGHT PANEL OF SOUTH ARM. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  5. 33. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    33. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, ca. May 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). CONSTRUCTION OF SOUTH ARM, SHOWING ERECTION TRAVELER. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  6. Environment Impact Analysis of Shield Passing Alongside Bridge Pile Platform Using Three Dimensional Numerical Simulation

    NASA Astrophysics Data System (ADS)

    Shang, Yanliang; Shi, Wenjun; Han, Tongyin; Qin, Zhichao; Du, Shouji

    2017-10-01

    The shield method has many advantages in the construction of urban subway, and has become the preferred method for the construction of urban subway tunnel. Taking Shijiazhuang metro line 3 (administrative center station - garden park station interval) Passing alongside bridge as the engineering background, double shield crossing the bridge pile foundation model was set up. The deformation and internal force of the pile foundation during the construction of the shield were analyzed. Pile stress caused by shield construction increases, but the maximum stress is less than the design strength; the maximum surface settlement caused by the construction of 10.2 mm, the results meet the requirements of construction.

  7. CF60 Concrete Composition Design and Application on Fudiankou Xijiang Super Large Bridge

    NASA Astrophysics Data System (ADS)

    Qiu, Yi Mei; Wen, Sen Yuan; Chen, Jun Xiang

    2018-06-01

    Guangxi Wuzhou City Ring Road Fudiankou Xijiang super large bridge CF60 concrete is a new multi-phase composite high-performance concrete, this paper for the Fudiankou Xijiang bridge structure and characteristics of the project, in accordance with the principle of local materials and technical specification requirements, combined with the site conditions of CF60 engineering high performance concrete component materials, proportion and the technical performance, quantify the main physical and mechanical performance index. Analysis main influencing factors of the technical indicators, reasonable adjustment of concrete mix design parameters, and the use of technical means of admixture and multi-function composite admixture of concrete, obtain the optimal proportion of good work, process, mechanical properties stability and durability of engineering properties, recommend and verification of concrete mix; to explore the CF60 high performance concrete Soil in the Fudiankou Xijiang bridge application technology, detection and tracking the quality of concrete construction, concrete structure during the construction of the key technology and control points is proposed, evaluation of CF60 high performance concrete in the actual engineering application effect and benefit to ensure engineering quality of bridge structure and service life, and super long span bridge engineering construction to provide basis and reference.

  8. Effect of voids in grouted, post-tensioned concrete bridge construction : volume 1--electrochemical testing and reliability assessment.

    DOT National Transportation Integrated Search

    2009-09-01

    Post-tensioned (PT) bridges are major structures that carry significant traffic. PT bridges are economical for spanning long distances. : In Texas, there are several signature PT bridges. In the late 1990s and early 2000s, several state highway agenc...

  9. Injury-induced ctgfa directs glial bridging and spinal cord regeneration in zebrafish

    PubMed Central

    Mokalled, Mayssa H.; Patra, Chinmoy; Dickson, Amy L.; Endo, Toyokazu; Stainier, Didier Y. R.; Poss, Kenneth D.

    2016-01-01

    Unlike mammals, zebrafish efficiently regenerate functional nervous system tissue after major spinal cord injury. Whereas glial scarring presents a roadblock for mammalian spinal cord repair, glial cells in zebrafish form a bridge across severed spinal cord tissue and facilitate regeneration, a relatively unexplored process. Here, we performed a genome-wide profiling screen for secreted factors that are upregulated during zebrafish spinal cord regeneration. We find that connective tissue growth factor a (ctgfa) is induced in and around glial cells that participate in initial bridging events. Mutations in ctgfa disrupt spinal cord repair, while transgenic ctgfa overexpression and local human CTGF recombinant protein delivery accelerate bridging and functional regeneration. Our study reveals that CTGF is necessary and sufficient to stimulate glial bridging and natural spinal cord regeneration. PMID:27811277

  10. Multi-parameter monitoring of the construction and evolution of a snow bridge over a crevasse on an Alpine glacier

    NASA Astrophysics Data System (ADS)

    Ravanel, Ludovic; Malet, Emmanuel; Batoux, Philippe

    2017-04-01

    Snow bridges that form over the crevasses of the Alpine glaciers allow mountaineers and skiers to cross them easily but constitute an important danger in case of rupture. Between 2008 and 2014, 37 injured persons and 13 deaths related to falls into crevasse were recorded (i.e. an average of two deaths per year) on the glaciers of the French side of the Mont Blanc massif - out of the famous Vallée Blanche ski route, which however embodies an important part of the aid related to falls into crevasses. To understand the construction and evolution of these fragile structures, instrumentation was set up on the Glacier du Géant, at 3450 m a.s.l., near the Aiguille du Midi (3842 m a.s.l.), on the French side of the Mont Blanc massif, close to a crevasse whose bridge had recently collapsed over a length of 37 m. The maximum width of the crevasse in this area is 6 m. At the top of a 7-m-high pole - to prevent future snowfalls -, sensors have been installed in September 2016 to measure different snow and weather parameters: air temperature, wind speed and direction, snow height. An automatic camera surveys the crevasse and the snow bridge geometry. Several other sensors monitor the temperature of snow and air in the crevasse. In addition, an extensometer was installed into the crevasse to measure the evolution of its width. The results of the first 6 months of survey are presented, including the formation of the bridge in mid-November, during a period of snowfall associated with a strong wind. Although the instrumentation is well suited to the high mountain conditions, its maintenance is delicate due to the strong instability of the environment (glacier movements and extreme weather conditions, primarily) but the results of this work will bring new glaciological knowledges which should participate in a better safety on glaciers.

  11. Roy D. Bridges Bridge

    NASA Image and Video Library

    2003-08-06

    From left, incoming KSC Director James W. Kennedy looks on as departing KSC Director Roy D. Bridges Jr. shakes hands with the 45th Space Wing Commander Brig. Gen. J. Gregory Pavlovich. The occasion is the unveiling of the new sign on the NASA Causeway naming the bridge for Bridges who is leaving KSC to become the director of NASA's Langley Research Center, Hampton, Va. The bridge spans the Banana River on the NASA Causeway and connects Kennedy Space Center and Cape Canaveral Air Force Station.

  12. Recommendations for the connection between full-depth precast bridge deck panel systems and precast I-beams.

    DOT National Transportation Integrated Search

    2007-01-01

    Precast bridge deck panels can be used in place of a cast-in-place concrete deck to reduce bridge closure times for deck replacements or new bridge construction. The panels are prefabricated at a precasting plant providing optimal casting and curing ...

  13. GPS for structural health monitoring - case study on the Basarab overpass cable-stayed bridge

    NASA Astrophysics Data System (ADS)

    Lepadatu, Alexandru; Tiberius, Christian

    2014-04-01

    The Basarab cable-stayed bridge is a newly built structure in Bucharest, Romania, which was inaugurated in June 2011. Before the oficial opening, in order to assure its qualification for trafic, it had to pass several loading tests with convoys of trucks and trams. For this, besides a priori evaluation using the Finite Element Method (FEM), levelling and acceleration measurements were made to identify vertical displacements, as well as vibration frequencies of the bridge. The three-day loading trial of the bridge represented a good opportunity for setting-up a GPS campaign for structural monitoring of the Basarab bridge. Taking advantage of the redundancy obtained via simultaneous multi-sensor measurements, it was possible to compare and validate the GPS estimated displacements with both FEM and levelling. Moreover, the dynamic behaviour of the bridge during a dynamic loading test was evaluated using a 20 Hz GPS observation rate and validated afterwards with vibration frequency estimates from acceleration time series. Along with simulations (FEM) and laboratory tests, the in situ monitoring of a structure has a particular importance in establishing the safety of a newly-built structure. Furthermore, in some cases permanent monitoring is needed for safety and economic reasons, especially for strategic structures such as dams and bridges. GPS technology can satisfy this request due to its real-time processing capability and thus it can be looked upon as a new and promising tool for dynamic evaluation of engineering structures. In this contribution we have also assessed the performance of GPS with regard to accuracy and false alarm probability demands for the continuous monitoring of the Basarab cable-stayed bridge.

  14. 35. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    35. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, June 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). ELEVENTH (LAST) PANEL OF SOUTH ARM UNDER CONSTRUCTION, SHOWING ERECTION TRAVELER. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  15. Effectiveness of exterior beam rotation prevention systems for bridge deck construction.

    DOT National Transportation Integrated Search

    2016-06-01

    Bridge decks often overhang past the exterior girders in order to increase the width of the deck while limiting the required : number of longitudinal girders. The overhanging portion of the deck results in unbalanced eccentric loads to the exterior g...

  16. Defining Appropriate Temperature for Perfect Erection Time of Steel Arch Bridge Closure to Minimize the Effect of the Thermal Stress. Case Study: The New Kutai Kartenagara Bridge, Indonesia

    NASA Astrophysics Data System (ADS)

    Sugihardjo, H.; Tavio; Prasetya, D.; Achmad, N. I.

    2017-11-01

    The impact of temperature change could govern the final stress of structural elements in the long-span steel bridges. The study was conducted to investigate the effect of temperature change during the construction of a new steel arch bridge, namely the Kutai Kartanegara Bridge. The main bridge has a total spanning length of 470 meters. The erection method of the bridge was the cantilever method with temporary towers, mast cranes, and stay cables. The deflections and internal forces of the steel elements were analyzed using the Midas Civil software. The study focuses on the effort to find the perfect erection time for the closure with regards to the temperature. By measuring the temperatures of the steel elements during the construction, it was found that they varied between 19 and 64 degrees Celsius. From the results of the analyses with various temperatures, it can be concluded that the recommended temperature for the closure erection was 44.6 degrees Celsius. This temperature is similar with the air temperature between either 6 AM and 12 noon or 12 noon and 6 PM. During this periods of time, the effect of thermal stress on the final internal forces in the bridge elements was found much lesser than those obtained during any other period of time.

  17. Evaluation of a bridge deck with CFRP prestressed panels under fatigue load cycles

    DOT National Transportation Integrated Search

    2003-09-01

    This report summarizes a study conducted under an IBRC (Innovative Bridge Research and Construction) project sponsored by the FHWA. In this project, a bridge deck with CFRP (carbon fiber reinforced polymeric) prestressed panels and cast-in-place topp...

  18. 16. PHOTOCOPY OF HISTORIC VIEW, HALFTONE PLATE DEPICTING CONSTRUCTION OF ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    16. PHOTOCOPY OF HISTORIC VIEW, HALF-TONE PLATE DEPICTING CONSTRUCTION OF BOSTON STREET BRIDGE, DATED DECEMBER 21, 1901, AND SHOWING CONCENTRIC RING OR ROWLOCK BOND CONSTRUCTION TECHNIQUE (HALF-TONE PLATE PUBLISHED IN BALTIMORE CITY ENGINEER'S ANNUAL REPORT FOR 1901, COURTESY ENOCH PRATT FREE LIBRARY) - Boston Street Bridge, Spanning Harris Creek Sewer at Boston Street, Baltimore, Independent City, MD

  19. Implementation of a Precast Inverted T-Beam System in Virginia: Part I : Laboratory Investigations

    DOT National Transportation Integrated Search

    2017-10-01

    The inverted T-beam system provides an accelerated bridge construction alternative for short-to-medium-span bridges. The system consists of adjacent precast inverted T-beams with a cast-in-place concrete topping. This bridge system is not expected to...

  20. 38. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    38. Photocopy of photograph, R.A. Hoffman, Bridge Engineer, Arizona Highway Department, photographer, ca. July 1928 (original print located at Arizona Department of Transportation, Phoenix AZ). VIEW FROM CANYON OF THIRD PANEL OF NORTH ARM UNDER CONSTRUCTION. - Navajo Bridge, Spanning Colorado River at U.S. Highway 89 Alternate, Page, Coconino County, AZ

  1. Contact area and pressure in suture bridge rotator cuff repair using knotless lateral anchors.

    PubMed

    Tompkins, Marc; Monchik, Keith O; Plante, Matthew J; Fleming, Braden C; Fadale, Paul D

    2011-10-01

    To evaluate whether the use of knotless lateral anchors in a suture bridge construct produces better contact area and pressure parameters than a suture bridge construct with standard lateral anchors that require knots or a double-row repair. The hypothesis was that knotless lateral anchors would produce better contact area and pressure parameters than the other two constructs. A total of fifteen matched pairs of cadaveric shoulders were divided into three groups. In Group 1, a suture bridge using knotless anchors for the lateral row was performed on five shoulders. A suture bridge using standard lateral row anchors that require knots was performed on the contralateral shoulders. In Group 2, suture bridge with knotless lateral row anchors was compared with double-row repair. In Group 3, suture bridge using standard lateral row anchors was compared with double-row repair. The contact conditions of the rotator cuff footprint were measured using pressure-sensitive film. There were no statistically significant differences between any of the techniques regarding contact area F(2, 15.7) = 3.09, P = 0.07 or mean contact pressure F(2, 15.1) = 2.35, P = 0.12. A post hoc power analysis suggests differences between techniques are likely less than 91-113 mm(2) for area and 0.071-0.089 N for pressure. The use of knotless anchors in the lateral row of a suture bridge repair did not increase the footprint contact area or contact pressure when compared to a suture bridge repair requiring knots laterally or to a double-row repair.

  2. Analysis of longitudinal seismic response of bridge with magneto-rheological elastomeric bearings

    NASA Astrophysics Data System (ADS)

    Li, Rui; Li, Xi; Wu, Yueyuan; Chen, Shiwei; Wang, Xiaojie

    2016-04-01

    As the weakest part in the bridge system, traditional bridge bearing is incapable of isolating the impact load such as earthquake. A magneto-rheological elastomeric bearing (MRB) with adjustable stiffness and damping parameters is designed, tested and modeled. The developed Bouc-Wen model is adopted to represent the constitutive relation and force-displacement behavior of an MRB. Then, the lead rubber bearing (LRB), passive MRB and controllable MRB are modeled by finite element method (FEM). Furthermore, two typical seismic waves are adopted as inputs for the isolation system of bridge seismic response. The experiments are carried out to investigate the different response along the bridge with on-off controlled MRBs. The results show that the isolating performance of MRB is similar to that of traditional LRB, which ensures the fail-safe capability of bridge with MRBs under seismic excitation. In addition, the controllable bridge with MRBs demonstrated the advantage of isolating capacity and energy dissipation, because it restrains the acceleration peak of bridge beam by 33.3%, and the displacement of bearing decrease by 34.1%. The shear force of the pier top is also alleviated.

  3. Development of a nondestructive evaluation method for FRP bridge decks

    NASA Astrophysics Data System (ADS)

    Brown, Jeff; Fox, Terra

    2010-05-01

    Open steel grids are typically used on bridges to minimize the weight of the bridge deck and wearing surface. These grids, however, require frequent maintenance and exhibit other durability concerns related to fatigue cracking and corrosion. Bridge decks constructed from composite materials, such as a Fiber-reinforced Polymer (FRP), are strong and lightweight; they also offer improved rideability, reduced noise levels, less maintenance, and are relatively easy to install compared to steel grids. This research is aimed at developing an inspection protocol for FRP bridge decks using Infrared thermography. The finite element method was used to simulate the heat transfer process and determine optimal heating and data acquisition parameters that will be used to inspect FRP bridge decks in the field. It was demonstrated that thermal imaging could successfully identify features of the FRP bridge deck to depths of 1.7 cm using a phase analysis process.

  4. Bridge-in-a-Backpack(TM). Task 4 : monitoring and load rating.

    DOT National Transportation Integrated Search

    2015-01-01

    Five bridges were constructed utilizing UMaines hybrid composite arch technology as part of the Maine : Department of Transportations Composites Initiative. Three were constructed in 2010, one in 2011 and the final : one in 2012. The designs fo...

  5. Simplified Analytical Model for a Queen-Post Covered Timber Bridge

    Treesearch

    F Fanous; D. Rammer; T. Wipf

    2013-01-01

    During the 19th century, the economic material to build bridges was timber due to its abundant availability, cost, and ease of construction. Many of the well-known timber bridge types are the Burr arch, Town lattice, Howe, Queen and King type of trusses. This paper summarizes an investigation that was sponsored by the Federal Highway Administration and the USDA Forest...

  6. The Collapse of the I-35W Bridge in Minneapolis

    ERIC Educational Resources Information Center

    Feldman, Bernard J.

    2010-01-01

    On Wednesday, Aug. 1, 2007, at 6:05 p.m. (during evening rush hour), the I-35W bridge across the Mississippi River in Minneapolis collapsed, killing 13 people and injuring 145. At the time of the collapse, repair work was in progress on the deck of the bridge, resulting in an additional 287 tons of construction material and equipment being on the…

  7. Using machine learning to accelerate sampling-based inversion

    NASA Astrophysics Data System (ADS)

    Valentine, A. P.; Sambridge, M.

    2017-12-01

    In most cases, a complete solution to a geophysical inverse problem (including robust understanding of the uncertainties associated with the result) requires a sampling-based approach. However, the computational burden is high, and proves intractable for many problems of interest. There is therefore considerable value in developing techniques that can accelerate sampling procedures.The main computational cost lies in evaluation of the forward operator (e.g. calculation of synthetic seismograms) for each candidate model. Modern machine learning techniques-such as Gaussian Processes-offer a route for constructing a computationally-cheap approximation to this calculation, which can replace the accurate solution during sampling. Importantly, the accuracy of the approximation can be refined as inversion proceeds, to ensure high-quality results.In this presentation, we describe and demonstrate this approach-which can be seen as an extension of popular current methods, such as the Neighbourhood Algorithm, and bridges the gap between prior- and posterior-sampling frameworks.

  8. Deck forms for bridge construction safety.

    DOT National Transportation Integrated Search

    2007-08-31

    Because I-girders have inherently weak torsion resistance, cross-frames and/or diaphragms are placed at close : spacing intervals to minimize the susceptibility of individual girders to instability during construction. A recent : increase in fatigue ...

  9. Shrinkage and durability study of bridge deck concrete.

    DOT National Transportation Integrated Search

    2010-12-01

    The Mississippi Department of Transportation is incorporating changes to material : specifications and construction procedures for bridge decks in an effort to reduce shrinkage : cracking. These changes are currently being implemented into a limited ...

  10. Integrating modal-based NDE techniques and bridge management systems using quality management

    NASA Astrophysics Data System (ADS)

    Sikorsky, Charles S.

    1997-05-01

    The intent of bridge management systems is to help engineers and managers determine when and where to spend bridge funds such that commerce and the motoring public needs are satisfied. A major shortcoming which states are experiencing is the NBIS data available is insufficient to perform certain functions required by new bridge management systems, such as modeling bridge deterioration and predicting costs. This paper will investigate how modal based nondestructive damage evaluation techniques can be integrated into bridge management using quality management principles. First, quality from the manufacturing perspective will be summarized. Next, the implementation of quality management in design and construction will be reinterpreted for bridge management. Based on this, a theory of approach will be formulated to improve the productivity of a highway transportation system.

  11. Procedures for scour assessments at bridges in Pennsylvania

    USGS Publications Warehouse

    Cinotto, Peter J.; White, Kirk E.

    2000-01-01

    Scour is the process and result of flowing water eroding the bed and banks of a stream. Scour at nearly 14,300 bridges(1) spanning water, and the stability of river and stream channels in Pennsylvania, are being assessed by the U.S. Geological Survey (USGS) in cooperation with the Pennsylvania Department of Transportation (PennDOT). Procedures for bridge-scour assessments have been established to address the needs of PennDOT in meeting a 1988 Federal Highway Administration mandate requiring states to establish a program to assess all public bridges over water for their vulnerability to scour. The procedures also have been established to help develop an understanding of the local and regional factors that affect scour and channel stability. This report describes procedures for the assessment of scour at all bridges that are 20 feet or greater in length that span water in Pennsylvania. There are two basic types of assessment: field-viewed bridge site assessments, for which USGS personnel visit the bridge site, and office-reviewed bridge site assessments, for which USGS personnel compile PennDOT data and do not visit the bridge site. Both types of assessments are primarily focused at assisting PennDOT in meeting the requirements of the Federal Highway Administration mandate; however, both assessments include procedures for the collection and processing of ancillary data for subsequent analysis. Date of bridge construction and the accessibility of the bridge substructure units for inspection determine which type of assessment a bridge receives. A Scour-Critical Bridge Indicator Code and a Scour Assessment Rating are computed from selected collected and compiled data. PennDOT personnel assign the final Scour-Critical Bridge Indicator Code and a Scour Assessment Rating on the basis of their review of all data. (1)Words presented in bold type are defined in the Glossary section of this report.

  12. Evaluation of Asphalt Bridge Deck Joint Systems.

    DOT National Transportation Integrated Search

    2009-12-01

    Asphaltic Plug Joint is an expansion joint that is used for new and rehabilitated bridges. It provides a smooth and watertight surface free of debris; and offers simple, easy and staged construction. Asphaltic plug joint can be repaired segmentally a...

  13. Study on the Old Girders in the Widening Hollow Slab Girder Bridge

    NASA Astrophysics Data System (ADS)

    Wang, Ying; Zhang, Li Fang; Ma, Hai Yan

    2018-06-01

    Taking the bridge widening project of Shanghai-Hangzhou-Ningbo expressway widening construction project (China) as the background in this paper, the variation law of the internal force of the old bridge in the widening hollow slab girder bridge under vehicle load is studied, which is under the condition of different span lengths and different widening widths. Three different span lengths of the pre-tensioned prestressed hollow slab girder bridges are selected, the spatial finite element models of both the old bridge and the whole structure of widening bridge are established and calculated respectively by Midas/Civil software. The influences of widening and load increasing on the old bridges under the vehicle load are compared and analyzed. In addition, the authors also analyze the influences of different widening widths on the force state of old bridges under the condition of widening the same number of lane. Moreover , the effects on the old bridges that are caused by the uneven foundation settlement of widening bridge structure are also studied in this paper. This paper can provide some references for widening design of hollow slab bridges.

  14. 47 CFR 80.1007 - Bridge-to-bridge radiotelephone installation.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 47 Telecommunication 5 2011-10-01 2011-10-01 false Bridge-to-bridge radiotelephone installation. 80.1007 Section 80.1007 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND... Bridge-to-Bridge Act § 80.1007 Bridge-to-bridge radiotelephone installation. Use of the bridge-to-bridge...

  15. 47 CFR 80.1007 - Bridge-to-bridge radiotelephone installation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Bridge-to-bridge radiotelephone installation. 80.1007 Section 80.1007 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND... Bridge-to-Bridge Act § 80.1007 Bridge-to-bridge radiotelephone installation. Use of the bridge-to-bridge...

  16. Hardwoods for timber bridges : a national program emphasis by the USDA Forest Service

    Treesearch

    James P. Wacker; Ed Cesa

    2005-01-01

    This paper describes the joint efforts of the Forest Service and the FHWA to administer national programs including research, demonstration bridges, and technology transfer components. Summary information on a number of Forest Service-WIT demonstration bridges constructed with hardwoods is also provided.

  17. 77 FR 1020 - Regulated Navigation Area; S99 Alford Street Bridge Rehabilitation Project, Mystic River, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-01-09

    ...-AA11 Regulated Navigation Area; S99 Alford Street Bridge Rehabilitation Project, Mystic River, MA... Mystic River under and surrounding the S99 Alford Street Bridge which crosses the Mystic River between... construction workers by restricting vessel traffic during periods where the bridge is being repaired. DATES...

  18. Risk management analysis for construction of Kutai Kartanegara bridge-East Kalimantan-Indonesia

    NASA Astrophysics Data System (ADS)

    Azis, Subandiyah

    2017-11-01

    Many sources of risk that may impede the achievement of the project objectives through either cost or quality and time, especially for bridges that have collapsed before, so when the implementation of possible hazard / high hazard so when should the possible hazard/high hazard be implemented The purpose of this research is to identify, to analyze risks by classifying the risks using the method of Risk Breakdown Structure (RBS) and managing the dominant risk of execution of the installation work to determine the handling of the steel frame in order to maximize the positive and minimize the incidence of adverse events. The results of this study indicate there are 15 sources of risks are identified, and there are 6 risk indicates the dominant risks. Mitigation performed on the dominant risks unacceptable i.e. Project factor that shows the delays in the arrival of materials due to locations, schedule of the arrival of materials should be tailored to the needs of the field and the amount of material that comes with the required field should also be evaluated. The result is expected to be a guideline for identifying risks and mitigation measures for further research. Subsequent researchers to pay attention on the security factor that implementation time does not affect the productivity of work in construction projects.

  19. Feasibility of using shape memory alloys to develop self post-tensioned concrete bridge girders.

    DOT National Transportation Integrated Search

    2013-08-01

    Post-tensioned (PT) structural elements are used quite often in bridges due to their ability to span long widths : economically while providing an aesthetically pleasing structure. PT systems are also preferred in bridge construction : because they g...

  20. A survey of non-arched historic concrete bridges in Virginia constructed prior to 1950 : final report.

    DOT National Transportation Integrated Search

    1996-01-01

    Bridges are among the cultural resources that must be considered for historic significance under the Historic Preservation Act of 1966. The Virginia Transportation Research Council conducted pioneering studies of Virginia's early metal truss bridges ...

  1. Constructing a mixed π-conjugated bridge to effectively enhance the nonlinear optical response in the Möbius cyclacene-based systems.

    PubMed

    Chen, Liwei; Yu, Guangtao; Chen, Wei; Tu, Chunyun; Zhao, Xingang; Huang, Xuri

    2014-06-14

    Using density functional theory computations, employing the concept of a mixed π-conjugated bridge can effectively improve the first hyperpolarizability (β0) of Möbius cyclacene (MC)-based systems with a D-π-A framework. This mixed π-conjugated bridge is constructed by applying a -(CH=CH)x-NH2 or -(CH=CH)x-NO2 chain to modify [8]MC, which can lead to a considerable β0 value (e.g. [8]MC-(CH=CH)12-NO2 (9.87 × 10(5) au) with only a certain chain length), much larger than the sole [8]MC (261 au) and the corresponding NH2/NO2-modified polyethylene chain with the same π-conjugated length. It is revealed that the substituent sites and the chain length can play a crucial role in improving β0 values of these MC-chain systems, where the β0 value can monotonically increase with increasing -(CH=CH)x- length, and the substituent electron-withdrawing -(CH=CH)x-NO2 chain is superior to the parallel electron-donating -(CH=CH)x-NH2. These appealing findings can provide valuable insights into the design of novel NLO materials based on MC.

  2. Tuning the mechanical properties of glass fiber-reinforced bismaleimide–triazine resin composites by constructing a flexible bridge at the interface

    PubMed Central

    Zeng, Xiaoliang; Yu, Shuhui; Lai, Maobai; Sun, Rong; Wong, Ching-Ping

    2013-01-01

    We demonstrate a new method that can simultaneously improve the strength and toughness of the glass fiber-reinforced bismaleimide–triazine (BT) resin composites by using polyethylene glycol (PEG) to construct a flexible bridge at the interface. The mechanical properties, including the elongation, ultimate tensile stress, Young’s modulus, toughness and dynamical mechanical properties were studied as a function of the length of PEG molecular chain. It was found that the PEG molecule acts as a bridge to link BT resin and glass fiber through covalent and non-covalent bondings, respectively, resulting in improved interfacial bonding. The incorporation of PEG produces an increase in elongation, ultimate tensile stress and toughness. The Young’s modulus and Tg were slightly reduced when the length of the PEG molecular chain was high. The elongation of the PEG-modified glass fiber-reinforced composites containing 5 wt% PEG-8000 increased by 67.1%, the ultimate tensile stress by 17.9% and the toughness by 78.2% compared to the unmodified one. This approach provides an efficient way to develop substrate material with improved strength and toughness for integrated circuit packaging applications. PMID:27877621

  3. Turbidity changes during culvert to bridge upgrades at Carmen Creek, Idaho

    Treesearch

    Randy B. Foltz; Breann Westfall; Ben Kopyscianski

    2012-01-01

    Carmen Creek, a tributary to the Salmon River in Idaho, was the site of two culvert to bridge upgrade operations in September and October 2011. Both locations were upgraded from multiple, large diameter culverts to bridge crossings. Turbidity readings measured at the end of the mixing zone during the nearly three weeks of upgrade construction activities did not exceed...

  4. Knotless double-row SutureBridge rotator cuff repairs have improved self-reinforcement compared with double-row SutureBridge repairs with tied medial knots: a biomechanical study using an ovine model.

    PubMed

    Smith, Geoffrey C S; Bouwmeester, Theresia M; Lam, Patrick H

    2017-12-01

    In double-row SutureBridge (Arthrex, Naples, FL, USA) rotator cuff repairs, increasing tendon load may generate progressively greater compression forces at the repair footprint (self-reinforcement). SutureBridge rotator cuff repairs using tied horizontal mattress sutures medially may limit this effect compared with a knotless construct. Rotator cuff repairs were performed in 9 pairs of ovine shoulders. One group underwent repair with a double-row SutureBridge construct with tied horizontal medial-row mattress sutures. The other group underwent repair in an identical fashion except that medial-row knots were not tied. Footprint contact pressure was measured at 0° and 20° of abduction under loads of 0 to 60 N. Pull-to-failure tests were then performed. In both repair constructs, each 10-N increase in rotator cuff tensile load led to a significant increase in footprint contact pressure (P < .0001). The rate of increase in footprint contact pressure was greater in the knotless construct (P < .00022; ratio, 1.69). The yield point approached the ultimate load to failure more closely in the knotless model than in the knotted construct (P = .00094). There was no difference in stiffness, ultimate failure load, or total energy to failure between the knotless and knotted techniques. In rotator cuff repair with a double-row SutureBridge configuration, self-reinforcement is seen in repairs with and without medial-row knots. Self-reinforcement is greater with the knotless technique. Copyright © 2017 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Elsevier Inc. All rights reserved.

  5. GeantV: from CPU to accelerators

    NASA Astrophysics Data System (ADS)

    Amadio, G.; Ananya, A.; Apostolakis, J.; Arora, A.; Bandieramonte, M.; Bhattacharyya, A.; Bianchini, C.; Brun, R.; Canal, P.; Carminati, F.; Duhem, L.; Elvira, D.; Gheata, A.; Gheata, M.; Goulas, I.; Iope, R.; Jun, S.; Lima, G.; Mohanty, A.; Nikitina, T.; Novak, M.; Pokorski, W.; Ribon, A.; Sehgal, R.; Shadura, O.; Vallecorsa, S.; Wenzel, S.; Zhang, Y.

    2016-10-01

    The GeantV project aims to research and develop the next-generation simulation software describing the passage of particles through matter. While the modern CPU architectures are being targeted first, resources such as GPGPU, Intel© Xeon Phi, Atom or ARM cannot be ignored anymore by HEP CPU-bound applications. The proof of concept GeantV prototype has been mainly engineered for CPU's having vector units but we have foreseen from early stages a bridge to arbitrary accelerators. A software layer consisting of architecture/technology specific backends supports currently this concept. This approach allows to abstract out the basic types such as scalar/vector but also to formalize generic computation kernels using transparently library or device specific constructs based on Vc, CUDA, Cilk+ or Intel intrinsics. While the main goal of this approach is portable performance, as a bonus, it comes with the insulation of the core application and algorithms from the technology layer. This allows our application to be long term maintainable and versatile to changes at the backend side. The paper presents the first results of basket-based GeantV geometry navigation on the Intel© Xeon Phi KNC architecture. We present the scalability and vectorization study, conducted using Intel performance tools, as well as our preliminary conclusions on the use of accelerators for GeantV transport. We also describe the current work and preliminary results for using the GeantV transport kernel on GPUs.

  6. GeantV: From CPU to accelerators

    DOE PAGES

    Amadio, G.; Ananya, A.; Apostolakis, J.; ...

    2016-01-01

    The GeantV project aims to research and develop the next-generation simulation software describing the passage of particles through matter. While the modern CPU architectures are being targeted first, resources such as GPGPU, Intel© Xeon Phi, Atom or ARM cannot be ignored anymore by HEP CPU-bound applications. The proof of concept GeantV prototype has been mainly engineered for CPU's having vector units but we have foreseen from early stages a bridge to arbitrary accelerators. A software layer consisting of architecture/technology specific backends supports currently this concept. This approach allows to abstract out the basic types such as scalar/vector but also tomore » formalize generic computation kernels using transparently library or device specific constructs based on Vc, CUDA, Cilk+ or Intel intrinsics. While the main goal of this approach is portable performance, as a bonus, it comes with the insulation of the core application and algorithms from the technology layer. This allows our application to be long term maintainable and versatile to changes at the backend side. The paper presents the first results of basket-based GeantV geometry navigation on the Intel© Xeon Phi KNC architecture. We present the scalability and vectorization study, conducted using Intel performance tools, as well as our preliminary conclusions on the use of accelerators for GeantV transport. Lastly, we also describe the current work and preliminary results for using the GeantV transport kernel on GPUs.« less

  7. Data collection and evaluation of continuity detail for John James Audubon Bridge No. 61390613004101.

    DOT National Transportation Integrated Search

    2014-10-01

    This report summarizes findings from monitoring data that was collected over a two-year period from Bridge No. : 61390613004101 in the John James Audubon Project, which was formerly designated as Bridge #2 prior to : construction completion. The brid...

  8. Natural canopy bridges effectively mitigate tropical forest fragmentation for arboreal mammals.

    PubMed

    Gregory, Tremaine; Carrasco-Rueda, Farah; Alonso, Alfonso; Kolowski, Joseph; Deichmann, Jessica L

    2017-06-20

    Linear infrastructure development and resulting habitat fragmentation are expanding in Neotropical forests, and arboreal mammals may be disproportionately impacted by these linear habitat clearings. Maintaining canopy connectivity through preservation of connecting branches (i.e. natural canopy bridges) may help mitigate that impact. Using camera traps, we evaluated crossing rates of a pipeline right-of-way in a control area with no bridges and in a test area where 13 bridges were left by the pipeline construction company. Monitoring all canopy crossing points for a year (7,102 canopy camera nights), we confirmed bridge use by 25 mammal species from 12 families. With bridge use beginning immediately after exposure and increasing over time, use rates were over two orders of magnitude higher than on the ground. We also found a positive relationship between a bridge's use rate and the number of species that used it, suggesting well-used bridges benefit multiple species. Data suggest bridge use may be related to a combination of bridge branch connectivity, multiple connections, connectivity to adjacent forest, and foliage cover. Given the high use rate and minimal cost, we recommend all linear infrastructure projects in forests with arboreal mammal populations include canopy bridges.

  9. Experimental analysis of a high-speed railway bridge under Thalys trains

    NASA Astrophysics Data System (ADS)

    Xia, H.; De Roeck, G.; Zhang, N.; Maeck, J.

    2003-11-01

    In this paper dynamic experiments on the Antoing Bridge located on the high-speed railway line between Paris and Brussels are reported. The experiments were co-operatively carried out by the Northern Jiaotong University from China, the Catholic University of Leuven, the Free University of Brussels and the Belgium Railway Company NMBS-SNCB from Belgium. The bridge is composed of multi-span simply supported PC girders with spans of 50 m and U-shaped sections. The loads are the high-speed Thalys trains with articulated vehicles. The speeds of the Thalys trains were between 265 and 310 km/h. In the experiments, the dynamic responses of the bridge such as the deflections, the accelerations and the strains that were measured by a laser velocity displacement transducer accelerometers and strain gauges, respectively. Many useful results have been obtained from the analysis of the recorded data. The tests and the measured results can be a reference for the study and the design of high-speed railway bridges.

  10. Field evaluation of hybrid\\0x2010composite girder bridges in Missouri.

    DOT National Transportation Integrated Search

    2014-06-01

    Three hybrid composite beam (HCB) bridges were recently constructed in Missouri, USA. HCB is an innovative idea : that incorporates traditional construction materials (steel and concrete) with fiber reinforced polymer (FRP) composites : in such a man...

  11. Bridging the Gap: Linking Simulation and Testing

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Krajewski, Paul E.; Carsley, John; Stoudt, Mark R.

    2012-09-01

    The Materials Genome Initiative (MGI) which is a key enabler for the Advanced Manufacturing Partnership, announced in 2011 by U.S. President Barack Obama, was established to accelerate the development and deployment of advanced materials. The MGI is driven by the need to "bridge the gap" between (I) experimental results and computational analysis to enable the rapid development and validation of new mateirals, and (II) the processes required to convert these materials into useable goods.

  12. Collision loads on bridge piers : phase 2, report of guidelines for designing bridge piers and abutments for vehicle collisions

    DOT National Transportation Integrated Search

    2011-03-01

    An instrumented, simulated bridge pier was constructed, and two full-scale collisions with an : 80,000-lb van-type tractor-trailer were performed on it. The trailer was ballasted with bags of sand on : pallets. The simulated pier was 36 inches in dia...

  13. 49 CFR Appendix A to Part 237 - Supplemental Statement of Agency Policy on the Safety of Railroad Bridges

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... for the design of a bridge can generally be used to determine and rate the load capacity of a bridge... from the service loads can be correlated to the stresses for which the bridge was designed or rated. 3... bridge should keep design, construction, maintenance and repair records readily accessible to permit the...

  14. 49 CFR Appendix A to Part 237 - Supplemental Statement of Agency Policy on the Safety of Railroad Bridges

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... for the design of a bridge can generally be used to determine and rate the load capacity of a bridge... from the service loads can be correlated to the stresses for which the bridge was designed or rated. 3... bridge should keep design, construction, maintenance and repair records readily accessible to permit the...

  15. 49 CFR Appendix A to Part 237 - Supplemental Statement of Agency Policy on the Safety of Railroad Bridges

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... for the design of a bridge can generally be used to determine and rate the load capacity of a bridge... from the service loads can be correlated to the stresses for which the bridge was designed or rated. 3... bridge should keep design, construction, maintenance and repair records readily accessible to permit the...

  16. 34. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    34. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Plan of masonry. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  17. Design and construction guidelines for strengthening bridges using fiber reinforced polymers (FRP).

    DOT National Transportation Integrated Search

    2014-09-01

    This research concerns the development of guidelines : for the design and use of externally-bonded FRP : strengthening systems on bridges in Michigan. Si : x representative international FRP-related guidelines : were analyzed and compared for applica...

  18. Investigation of Prefabricated Steel-Truss Bridge Deck System

    DOT National Transportation Integrated Search

    2017-11-01

    Steel truss bridges are an efficient and aesthetic option for highway crossings. Their relatively light weight compared with plate girder systems make them a desirable alternative for both material savings and constructability. A prototype of a welde...

  19. US Particle Accelerators at Age 50.

    ERIC Educational Resources Information Center

    Wilson, R. R.

    1981-01-01

    Reviews the development of accelerators over the past 50 years. Topics include: types of accelerators, including cyclotrons; sociology of accelerators (motivation, financing, construction, and use); impact of war; national laboratories; funding; applications; future projects; foreign projects; and international collaborations. (JN)

  20. Feasibility of using high-strength steel and MMFX rebar in bridge design.

    DOT National Transportation Integrated Search

    2009-07-01

    Pressed by increases in construction costs coupled with insufficient funding for maintenance and new construction, many state and federal agencies are now specifying a service life of 75 years for all concrete bridges without significant repairs. In ...

  1. Evaluating vehicular-induced bridge vibrations for energy harvesting applications

    NASA Astrophysics Data System (ADS)

    Reichenbach, Matthew; Fasl, Jeremiah; Samaras, Vasilis A.; Wood, Sharon; Helwig, Todd; Lindenberg, Richard

    2012-04-01

    Highway bridges are vital links in the transportation network in the United States. Identifying possible safety problems in the approximately 600,000 bridges across the country is generally accomplished through labor-intensive, visual inspections. Ongoing research sponsored by NIST seeks to improve inspection practices by providing real-time, continuous monitoring technology for steel bridges. A wireless sensor network with a service life of ten years that is powered by an integrated energy harvester is targeted. In order to achieve the target ten-year life for the monitoring system, novel approaches to energy harvesting for use in recharging batteries are investigated. Three main sources of energy are evaluated: (a) vibrational energy, (b) solar energy, and (c) wind energy. Assessing the energy produced from vehicular-induced vibrations and converted through electromagnetic induction is the focus of this paper. The goal of the study is to process acceleration data and analyze the vibrational response of steel bridges to moving truck loads. Through spectral analysis and harvester modeling, the feasibility of vibration-based energy harvesting for longterm monitoring can be assessed. The effects of bridge conditions, ambient temperature, truck traffic patterns, and harvester position on the power content of the vibrations are investigated. With sensor nodes continually recharged, the proposed real-time monitoring system will operate off the power grid, thus reducing life cycle costs and enhancing inspection practices for state DOTs. This paper will present the results of estimating the vibration energy of a steel bridge in Texas.

  2. Accelerator Science: Circular vs. Linear

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Lincoln, Don

    Particle accelerator are scientific instruments that allow scientists to collide particles together at incredible energies to study the secrets of the universe. However, there are many manners in which particle accelerators can be constructed. In this video, Fermilab’s Dr. Don Lincoln explains the pros and cons of circular and linear accelerators.

  3. 26. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    26. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: General plan of truss spans. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  4. 36. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    36. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: General plan of west approach. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  5. 35. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    35. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: General plan of east approach. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  6. 29. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    29. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Detail of small truss. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  7. 33. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    33. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Plan of shoes, bolsters, & rollers. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  8. Investigation of concrete containing slag : Hampton River Bridge.

    DOT National Transportation Integrated Search

    1986-01-01

    The study evaluated the properties of concretes containing slag in a 50% replacement of the portland cement to assess their suitability as an alternative to the portland cement concretes normally used in the construction of bridge substructures. For ...

  9. The optimum tension for bridging sutures in transosseous-equivalent rotator cuff repair: a cadaveric biomechanical study.

    PubMed

    Park, Ji Soon; McGarry, Michelle H; Campbell, Sean T; Seo, Hyuk Jun; Lee, Yeon Soo; Kim, Sae Hoon; Lee, Thay Q; Oh, Joo Han

    2015-09-01

    Transosseous-equivalent (TOE) rotator cuff repair can increase contact area and contact pressure between the repaired cuff tendon and bony footprint and can show higher ultimate loads to failure and smaller gap formation compared with other repair techniques. However, it has been suggested that medial rotator cuff failure after TOE repair may result from increased bridging suture tension. To determine optimum bridging suture tension in TOE repair by evaluating footprint contact and construct failure characteristics at different tensions. Controlled laboratory study. A total of 18 fresh-frozen cadaveric shoulders, randomly divided into 3 groups, were constructed with a TOE configuration using the same medial suture anchor and placing a Tekscan sensing pad between the repaired rotator cuff tendon and footprint. Nine of the 18 shoulders were used to measure footprint contact characteristics. With use of the Tekscan measurement system, the contact pressure and area between the rotator cuff tendon and greater tuberosity were quantified for bridging suture tensions of 60, 90, and 120 N with glenohumeral abduction angles of 0° and 30° and humeral rotation angles of 30° (internal), 0°, and 30° (external). TOE constructs of all 18 shoulders then underwent construct failure testing (cyclic loading and load to failure) to determine the yield load, ultimate load, stiffness, hysteresis, strain, and failure mode at 60 and 120 N of tension. As bridging suture tension increased, contact force, contact pressure, and peak pressure increased significantly at all positions (P < .05 for all). Regarding contact area, no significant differences were found between 90 and 120 N at all positions, although there were significant differences between 60 and 90 N. The construct failure test demonstrated no significant differences in any parameters according to various tensions (P > .05 for all). Increasing bridging suture tension to over 90 N did not improve contact area but did increase

  10. Synthesis of concrete bridge piles prestressed with CFRP systems.

    DOT National Transportation Integrated Search

    2017-06-01

    The Texas Department of Transportation frequently constructs prestressed concrete piles for use in bridge : foundations. Such prestressed concrete piles are typically built with steel strands that are highly susceptible to : environmental degradation...

  11. Dynamics and statics of nonaxisymmetric liquid bridges

    NASA Technical Reports Server (NTRS)

    Alexander, J. Iwan D.; Resnick, Andy; Zhang, Yiqiang; Fedoseyev, A.

    1994-01-01

    We finished the construction of the experimental apparatus and the design and testing of some of the visualization and data acquisition techniques. Experimental work focused on three areas: force measurements, loss of stability to nonaxisymmetric bridges, and vibration behavior. The experimental work is summarized in section 2. Selected results from our force measurement experiments are outlined in section 3. In addition we worked on the theory of the dynamic stability of axisymmetric bridges and undertook numerical simulation of the effects of inclined gravity vectors on the minimum volume stability limit for static bridges. The results and status of our theoretical work and numerical simulation are described in section 4. Papers published and in preparation, conference presentations, etc., are described in section 5. Work planned for the third year is discussed in section 6. References cited in the report are listed in section 7.

  12. Accelerator Science: Circular vs. Linear

    ScienceCinema

    Lincoln, Don

    2018-06-12

    Particle accelerator are scientific instruments that allow scientists to collide particles together at incredible energies to study the secrets of the universe. However, there are many manners in which particle accelerators can be constructed. In this video, Fermilab’s Dr. Don Lincoln explains the pros and cons of circular and linear accelerators.

  13. Dynamic response for structural health monitoring of the Penang (I) cable-stayed bridge

    NASA Astrophysics Data System (ADS)

    Mohammed, M. I.; Sulaeman, E.; Mustapha, F.

    2017-03-01

    The paper discusses the dynamic response of the Penang (I) cable stayed bridge structure under various moving load representing typical traffic load of the bridge. The bridge has a total span of 440 m excluding the transition bridge that assumed to be not connected structurally to the main bridge structure. The bridge that links the fast growing Pinang Island and the Malaysian Mainland Peninsula has been known to be fully utilized which leads to the construction of Penang (II) bridge and now the third one. Due to highly traffic use of the bridge that may lead to reduction of the bridge design life, the dynamic response of the bridge becomes important to predict critical part of the bridge structure elements including the main girder and the 144 stay cables. The present study reveals that, due to flexible nature of the cable stayed bridge, the moving load that interacts with the natural dynamic characteristics of the bridge, gives significant stress increment compare to proportional static load especially when the moving load is un-symmetric. For this reason, several classes of typical vehicle passing the bridge with various vehicle speeds are investigated to demonstrate their effect on the bridge displacement, internal forces and stresses. The results can be used for further fatigue assessment of the bridge.

  14. Ileostomy rod--is it a bridge too far?

    PubMed

    Speirs, M; Leung, E; Hughes, D; Robertson, I; Donnelly, L; Mackenzie, I; Macdonald, A

    2006-07-01

    Defunctioning loop ileostomies are used commonly to protect low colorectal anastomoses and thereby reducing the serious complications of leakage. However, they are associated with specific complications such as retraction. Traditionally, a supporting rod is placed as a bridge to support both limbs of the stoma in the hope of reducing the incidence of stomal retraction. There is little evidence in the published literature to support this practice. The aim of this study was to determine whether using an ileostomy rod would reduce the incidence of stomal retraction. A prospective, randomised controlled trial was performed in 60 consecutive patients who required a defunctioning loop ileostomy. Patients were allocated to either a 'bridge' or 'bridge-less' protocol. All the patients were assessed by dedicated stoma nurses for at least 3 months and until their stomas were closed. Their postoperative symptoms, including stoma activity and retraction rate, were recorded. Between May 2001 and June 2004, 57 patients completed the study (28 bridge; 29 bridge-less). There were no significant differences in the retraction rate between the groups. No clinical anastomotic leakage was recorded and none of the patients required early closure. If a loop ileostomy is constructed properly, stomal retraction is uncommon and routine use of a bridge is unnecessary.

  15. Evaluation of Stainless Steel Reinforcement in Bridge Decks.

    DOT National Transportation Integrated Search

    2007-10-01

    This report is a follow up and final report to the report on the Evaluation of Stainless Steel Reinforcement, Construction Report. RDT 03 003. The results of interim testing during the bridges first five years are reported for Missouris...

  16. 47 CFR 80.331 - Bridge-to-bridge communication procedure.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 47 Telecommunication 5 2011-10-01 2011-10-01 false Bridge-to-bridge communication procedure. 80..., Alarm, Urgency and Safety Procedures § 80.331 Bridge-to-bridge communication procedure. (a) Vessels subject to the Bridge-to-Bridge Act transmitting on the designated navigational frequency must conduct...

  17. 47 CFR 80.331 - Bridge-to-bridge communication procedure.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Bridge-to-bridge communication procedure. 80..., Alarm, Urgency and Safety Procedures § 80.331 Bridge-to-bridge communication procedure. (a) Vessels subject to the Bridge-to-Bridge Act transmitting on the designated navigational frequency must conduct...

  18. 27. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    27. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Detail of truss (end with inclined end post). - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  19. 37. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    37. Photographic copy of historic construction drawing, ink on linen, no date (est. January 1890) (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Plan of masonry approach. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  20. 28. Photographic copy of historic construction drawing, ink or linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    28. Photographic copy of historic construction drawing, ink or linen, December 1889 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge: Detail of truss (end which abuts small truss). - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  1. 31. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    31. Photographic copy of historic construction drawing, ink on linen, January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge (truss spans): Plan of portal struts. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  2. 32. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    32. Photographic copy of historic construction drawing, ink on linen, December 1889 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge (truss span): Detail of longitudinal & top struts. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  3. 25. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    25. Photographic copy of historic construction drawing, ink on linen, November 1889/January 1890 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Plan and profile of Selby Avenue Bridge. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  4. 30. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    30. Photographic copy of historic construction drawing, ink on linen, December 1889 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Selby Avenue Bridge (truss spans): section of roadway with details. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  5. Evaluation of an earth heated bridge deck.

    DOT National Transportation Integrated Search

    1984-04-01

    The design, construction, performance and analysis of the first ground heat pipe : system to heat an entire bridge deck are detailed. Each of the sixty heat pipes in : this system is comprised of a 6 em (2.4") diameter, 31 m (lOO')_long vertical grou...

  6. 58. Photographic copy of original construction plan (St. Paul Engineer's ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    58. Photographic copy of original construction plan (St. Paul Engineer's Office, Wabasha St. Bridge, Plan of Masonry, February 1899); south abutment - Wabasha Street Bridge, Spanning Mississippi River at Wabasha Street, Saint Paul, Ramsey County, MN

  7. The algorithm for duration acceleration of repetitive projects considering the learning effect

    NASA Astrophysics Data System (ADS)

    Chen, Hongtao; Wang, Keke; Du, Yang; Wang, Liwan

    2018-03-01

    Repetitive project optimization problem is common in project scheduling. Repetitive Scheduling Method (RSM) has many irreplaceable advantages in the field of repetitive projects. As the same or similar work is repeated, the proficiency of workers will be correspondingly low to high, and workers will gain experience and improve the efficiency of operations. This is learning effect. Learning effect is one of the important factors affecting the optimization results in repetitive project scheduling. This paper analyzes the influence of the learning effect on the controlling path in RSM from two aspects: one is that the learning effect changes the controlling path, the other is that the learning effect doesn't change the controlling path. This paper proposes corresponding methods to accelerate duration for different types of critical activities and proposes the algorithm for duration acceleration based on the learning effect in RSM. And the paper chooses graphical method to identity activities' types and considers the impacts of the learning effect on duration. The method meets the requirement of duration while ensuring the lowest acceleration cost. A concrete bridge construction project is given to verify the effectiveness of the method. The results of this study will help project managers understand the impacts of the learning effect on repetitive projects, and use the learning effect to optimize project scheduling.

  8. Cross-bridge kinetics, cooperativity, and negatively strained cross- bridges in vertebrate smooth muscle. A laser-flash photolysis study

    PubMed Central

    1988-01-01

    The effects of laser-flash photolytic release of ATP from caged ATP [P3- 1(2-nitrophenyl)ethyladenosine-5'-triphosphate] on stiffness and tension transients were studied in permeabilized guinea pig protal vein smooth muscle. During rigor, induced by removing ATP from the relaxed or contracting muscles, stiffness was greater than in relaxed muscle, and electron microscopy showed cross-bridges attached to actin filaments at an approximately 45 degree angle. In the absence of Ca2+, liberation of ATP (0.1-1 mM) into muscles in rigor caused relaxation, with kinetics indicating cooperative reattachment of some cross- bridges. Inorganic phosphate (Pi; 20 mM) accelerated relaxation. A rapid phase of force development, accompanied by a decline in stiffness and unaffected by 20 mM Pi, was observed upon liberation of ATP in muscles that were released by 0.5-1.0% just before the laser pulse. This force increment observed upon detachment suggests that the cross- bridges can bear a negative tension. The second-order rate constant for detachment of rigor cross-bridges by ATP, in the absence of Ca2+, was estimated to be 0.1-2.5 X 10(5) M-1s-1, which indicates that this reaction is too fast to limit the rate of ATP hydrolysis during physiological contractions. In the presence of Ca2+, force development occurred at a rate (0.4 s-1) similar to that of intact, electrically stimulated tissue. The rate of force development was an order of magnitude faster in muscles that had been thiophosphorylated with ATP gamma S before the photochemical liberation of ATP, which indicates that under physiological conditions, in non-thiophosphorylated muscles, light-chain phosphorylation, rather than intrinsic properties of the actomyosin cross-bridges, limits the rate of force development. The release of micromolar ATP or CTP from caged ATP or caged CTP caused force development of up to 40% of maximal active tension in the absence of Ca2+, consistent with cooperative attachment of cross-bridges

  9. Accelerated bridge construction (ABC) decision making and economic modeling tool.

    DOT National Transportation Integrated Search

    2011-12-01

    In this FHWA-sponsored pool funded study, a set of decision making tools, based on the Analytic Hierarchy Process (AHP) was developed. This tool set is prepared for transportation specialists and decision-makers to determine if ABC is more effective ...

  10. Improved connection details for adjacent prestressed bridge beams.

    DOT National Transportation Integrated Search

    2015-03-01

    Bridges with adjacent box beams and voided slabs are simply and rapidly constructed, and are well suited to : short to medium spans. The traditional connection between the adjacent members is a shear key lled with a : conventional non-shrink grout...

  11. Health monitoring of post-tension tendons in bridges.

    DOT National Transportation Integrated Search

    2003-01-01

    Post-tensioned concrete has been used in a number of bridge structures and is expected to be used more in future construction in Virginia. This type of detail offers unique advantages for improving the performance of concrete members. Recent problems...

  12. Bridge-in-a-Backpack(TM). Task 1 : investigation of span lengths up to 70 feet.

    DOT National Transportation Integrated Search

    2011-08-01

    The Bridge-in-a-Backpack has previously been demonstrated with short spans. The first : constructed one, Neal Bridge in Pittsfield, Maine had a span of 34 feet. This task includes : research and development that demonstrates the technology can be ...

  13. Continuous acoustic emission monitoring of reinforced concrete under accelerated corrosion

    NASA Astrophysics Data System (ADS)

    Di Benedetti, M.; Loreto, G.; Nanni, A.; Matta, F.; Gonzalez-Nunez, M. A.

    2011-04-01

    The development of techniques capable of evaluating deterioration of reinforced concrete (RC) structures is instrumental to the advancement of techniques for the structural health monitoring (SHM) and service life estimate for constructed facilities. One of the main causes leading to degradation of RC is the corrosion of the steel reinforcement. This process can be modeled phenomenologically, while laboratory tests aimed at studying durability responses are typically accelerated in order to provide useful results within a realistic period of time. To assess the condition of damage in RC, a number of nondestructive methods have been recently studied. Acoustic emission (AE) is emerging as a nondestructive tool to detect the onset and progression of deterioration mechanisms. In this paper, the development of accelerated corrosion and continuous AE monitoring test set-up for RC specimens are presented. Relevant information are provided with regard to the characteristics of the corrosion circuit, continuous measurement and acquisition of corrosion potential, selection of AE sensors and AE parameter setting. The effectiveness of the setup in detecting and characterizing the initiation and progression of the corrosion phenomenon is discussed on the basis of preliminary results from small-scale, pre-cracked RC specimens, which are representative of areas near the clear cover in typical RC bridge members.

  14. Evaluation of DOTD semi-integral bridge and abutment system.

    DOT National Transportation Integrated Search

    2005-03-01

    The Louisiana Department of Transportation and Development (LADOTD) designed and constructed its first prototype semi-integral abutment bridge in 1989. In this design, large longitudinal movements due to expansion and contraction, creep, shrinkage, a...

  15. Smart FRP Composite Sandwich Bridge Decks in Cold Regions

    DOT National Transportation Integrated Search

    2011-07-01

    In this study, new and integrated Smart honeycomb Fiber-Reinforced Polymer (S-FRP) : sandwich materials for various transportation construction applications, with particular emphasis : on highway bridge decks in cold regions, were developed and teste...

  16. Five-year clinical evaluation of zirconia-based bridges in patients in UK general dental practices.

    PubMed

    Burke, F J T; Crisp, R J; Cowan, A J; Lamb, J; Thompson, O; Tulloch, N

    2013-11-01

    This study reported the results at 5 years of fixed-fixed all-ceramic bridges, constructed in a yttria oxide stabilized tetragonal zirconium oxide polycrystal (Y-TZP) substructure, placed in adult patients in UK general dental practices. Four UK general dental practitioners recruited patients who required fixed bridgework and, after obtaining informed written consent, appropriate clinical and radiographic assessments were completed. The teeth were prepared and bridges constructed in accordance with the manufacturer's instructions. Each bridge was reviewed annually within 3 months of the anniversary of its placement by a calibrated examiner, together with the clinician who had placed the restoration, using modified USPHS criteria. Of the 41 bridges originally placed, 33 bridges were examined at 5 years. All Y-TZP frameworks were intact and no bridge retainers had debonded. Eight chipping fractures in the veneering ceramic were noted over the 5-year period. In five cases the patients were unaware of these and these cases were polished. Of the remaining three cases, in one a repair was attempted but was unsuccessful, but the bridge remained in satisfactory service. However, in the case involving a chipping fracture of the mesial-incisal angle of a central incisor, it was considered that replacement of the bridge was necessary. 97% (n=32) of the 33 Lava Y-TZP fixed-fixed bridges, evaluated in patients attending UK general dental practices, were found to be performing satisfactorily. The use of Y-TZP frameworks holds promise. Copyright © 2013 Elsevier Ltd. All rights reserved.

  17. 15. Photocopy of drawing, truss elevations, Bridge No. 79B, Main ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    15. Photocopy of drawing, truss elevations, Bridge No. 79B, Main & Washington Sts., So. Norwalk, Ct., N. Y. Division, N.Y., N.H. and H.R.R., dated April 21, 1895. Original on file with Construction Management and Facilities Engineering Department, Metro North Commuter Railroad, 420 Lexington Avenue, New York, N.Y. - South Norwalk Railroad Bridge, South Main & Washington Streets, Norwalk, Fairfield County, CT

  18. Evaluation of Erection Procedures of the Horizontally Curved Steel I-Girder Ford City Veterans Bridge

    DOT National Transportation Integrated Search

    2002-03-06

    In the case of horizontally steel curved I-girder bridges, it is important to carefully analyze the erection sequence of the superstructure so as to ensure that difficulties do not arise in the field during construction of the bridge. Generally, prob...

  19. Performance evaluation of Iowa bridge decks constructed with epoxy-coated reinforcing bars.

    DOT National Transportation Integrated Search

    2011-08-01

    Epoxy coatings have been used on the embedded reinforcing bars of bridge decks since the mid-1970s to : mitigate deterioration caused by chloride-induced corrosion. The use of chloride-based deicers became : common in the early 1960s and caused corro...

  20. Performance specification for high performance concrete overlays on bridges.

    DOT National Transportation Integrated Search

    2004-01-01

    Hydraulic cement concrete overlays are usually placed on bridges to reduce the infiltration of water and chloride ions and to improve skid resistance, ride quality, and surface appearance. Constructed in accordance with prescription specifications, s...

  1. Smart FRP Composite Sandwich Bridge Decks in Cold Regions

    DOT National Transportation Integrated Search

    2011-07-01

    In this study, new and integrated Smart honeycomb Fiber-Reinforced Polymer (S-FRP) sandwich materials for various transportation construction applications, with particular emphasis on highway bridge decks in cold regions, were developed and tested. T...

  2. BridgePBEE | BridgePBEE

    Science.gov Websites

    jacking Item 22: Bridge removal (column) Item 23: Bridge removal (portion) Item 24: Approach slab removal for: Search Menu Log in Register PEER Center - 325 Davis Hall, University of California, Berkeley, CA

  3. Development of Secondary Route Bridge Design Plan Guides

    DOT National Transportation Integrated Search

    2018-03-03

    The objective of this study is to develop a set of bridge plan guides for low-volume traffic roads. The purpose of the plans is to facilitate construction of new structures suitable for local agencies. The designs are to specifically address common l...

  4. Utilization of steel in industrialized highway bridge systems.

    DOT National Transportation Integrated Search

    1974-01-01

    The space frame concept presented in this report represents the results of an effort to minimize on-site construction time while utilizing steel to provide a high quality but competitive type of bridge structure. A necessary part of the effort was th...

  5. Long-term behavior of integral abutment bridges : appendix D, Bowen lab soil borings.

    DOT National Transportation Integrated Search

    2011-01-01

    Integral abutment (IA) construction has become the preferred method over conventional construction for use with typical highway bridges. However, the use of these structures is limited due to state mandated length and skew limitations. To expand thei...

  6. Parent Book Talk to Accelerate Spanish Content Vocabulary Knowledge

    ERIC Educational Resources Information Center

    Pollard-Durodola, Sharolyn D.; Gonzalez, Jorge E.; Satterfield, Teresa; Benki, José R.; Vaquero, Juana; Ungco, Camille

    2017-01-01

    This article bridges research to practice by summarizing an interactive content-enriched shared book reading approach that Spanish-speaking parents of preschool-age children can easily use in the home to accelerate content vocabulary knowledge in Spanish. The approach was implemented in preschool classrooms using a transitional bilingual education…

  7. Shake table test of soil-pile groups-bridge structure interaction in liquefiable ground

    NASA Astrophysics Data System (ADS)

    Tang, Liang; Ling, Xianzhang; Xu, Pengju; Gao, Xia; Wang, Dongsheng

    2010-03-01

    This paper describes a shake table test study on the seismic response of low-cap pile groups and a bridge structure in liquefiable ground. The soil profile, contained in a large-scale laminar shear box, consisted of a horizontally saturated sand layer overlaid with a silty clay layer, with the simulated low-cap pile groups embedded. The container was excited in three El Centro earthquake events of different levels. Test results indicate that excessive pore pressure (EPP) during slight shaking only slightly accumulated, and the accumulation mainly occurred during strong shaking. The EPP was gradually enhanced as the amplitude and duration of the input acceleration increased. The acceleration response of the sand was remarkably influenced by soil liquefaction. As soil liquefaction occurred, the peak sand displacement gradually lagged behind the input acceleration; meanwhile, the sand displacement exhibited an increasing effect on the bending moment of the pile, and acceleration responses of the pile and the sand layer gradually changed from decreasing to increasing in the vertical direction from the bottom to the top. A jump variation of the bending moment on the pile was observed near the soil interface in all three input earthquake events. It is thought that the shake table tests could provide the groundwork for further seismic performance studies of low-cap pile groups used in bridges located on liquefiable groun.

  8. Influence of microclimate on the sustainability and reliability of weathering steel bridge

    NASA Astrophysics Data System (ADS)

    Kubzova, M.; Krivy, V.; Kreislova, K.

    2018-04-01

    Reliability and sustainability of bridge structures designed from weathering steel are influenced by the development of a sufficiently protective layer of corrosion products on its surface. The development of this protective layer is affected by several parameters such as air pollution around the bridge structure, the microclimate under the bridge, the location of surface within the bridge structure and the time of wetness. Design of structural details also significantly influences the development of the protective corrosion layer. The article deals with the results of the experimental tests carried out on the road bridge located in the city of Ostrava in the Czech Republic. The development of the protective corrosion layer on the surface of the bridge is significantly influenced by the intensive traffic under the bridge construction and the design solution of the bridge itself. Attention is focused mainly on the influence of chloride deposition on the protective function of the corrosion layer. Corrosion samples were placed on the bridge to evaluate the influence of the above-mentioned parameters. The deposition rate of chlorides spreading from the road to surfaces of the steel structure is also measured.

  9. Integral abutment bridge for Louisiana's soft and stiff soils.

    DOT National Transportation Integrated Search

    2008-02-01

    The proposed research will be to field instrument, monitor, and analyze the design and construction of full integral abutment bridges for Louisianas soft and stiff soil conditions. Comparison of results will be submitted to the Louisiana Departmen...

  10. Internally sealed concrete for bridge deck protection : final report.

    DOT National Transportation Integrated Search

    1983-01-01

    This study investigated the characteristics of internally sealed concrete through tests on specimens fabricated in the laboratory to determine its properties and an installation in a bridge deck to assess the controls needed during construction and i...

  11. Development of precast bridge deck overhang system : technical report.

    DOT National Transportation Integrated Search

    2011-07-01

    The implementation of full-depth, precast overhang panel systems has the potential to improve constructability, : productivity, and make bridges more economical. Initial testing and analyses reported in the 0-6100-2 report resulted in : a design that...

  12. Effect of vertical ground motion on earthquake-induced derailment of railway vehicles over simply-supported bridges

    NASA Astrophysics Data System (ADS)

    Jin, Zhibin; Pei, Shiling; Li, Xiaozhen; Liu, Hongyan; Qiang, Shizhong

    2016-11-01

    The running safety of railway vehicles on bridges can be negatively affected by earthquake events. This phenomenon has traditionally been investigated with only the lateral ground excitation component considered. This paper presented results from a numerical investigation on the contribution of vertical ground motion component to the derailment of vehicles on simply-supported bridges. A full nonlinear wheel-rail contact model was used in the investigation together with the Hertzian contact theory and nonlinear creepage theory, which allows the wheel to jump vertically and separate from the rail. The wheel-rail relative displacement was used as the criterion for derailment events. A total of 18 ground motion records were used in the analysis to account for the uncertainty of ground motions. The results showed that inclusion of vertical ground motion will likely increase the chance of derailment. It is recommended to include vertical ground motion component in earthquake induced derailment analysis to ensure conservative estimations. The derailment event on bridges was found to be more closely related to the deck acceleration rather than the ground acceleration.

  13. Mujarrah Canal Bridge, Ramadi, Iraq

    DTIC Science & Technology

    2009-07-14

    eastern span (Span No. 1) of the structure. The detonation caused damage to the pier cap (the beam across the column top) of Bent No. 1 and post-tensioned...damage to the existing bridge, the temporary jacking and support of the existing structure, construction of the post-tensioned concrete beams and...placed directly onto the precast -concrete pans; and vertical offsets between the individual precast -concrete deck pans. Also, SIGIR identified

  14. The collapse of Tacoma Narrows Bridge: a piece to the puzzle

    NASA Astrophysics Data System (ADS)

    Walther, J. H.; Christensen, D. S.; Malthe, M. G.; Roenne, M.; Spietz, H. J.; Larsen, A.; Larsen, S. V.

    2017-11-01

    On Nov. 7th 1940 the newly constructed Tacoma Narrows Bridge collapsed due to excessive torsional oscillations caused by the formation and shedding of large coherent vortices. The subsequent wind tunnel tests conducted on both section- and full bridge models concluded that the bridge should have collapsed at a wind speed corresponding to approximately half of the wind speed at the day of the collapse. This discrepancy questions our understanding of the phenomena responsible for the failure of the bridge. The present study aims at clarifying this ``mystery'' by considering historical records made available by the US coast guards, and by performing wind tunnel tests and detailed numerical flow simulations. Our findings indicate that the discrepancy is caused by an until now unnoticed yawed wind direction relative to the bridge, which was present at the day of the collapse. Danish Council for Independent Research Grant No. 4184-00349B.

  15. 38. Photographic copy of historic construction drawing, ink on linen, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    38. Photographic copy of historic construction drawing, ink on linen, February 1902 (original filed in drawer 98, Bridge Division, Department of Public Works, St. Paul City Annex). Re- flooring and re-paving of Selby Avenue Bridge over tracks of Chicago, Milwaukee & St. Paul RY. CO. - Selby Avenue Bridge, Spanning Short Line Railways track at Selby Avenue between Hamline & Snelling Avenues, Saint Paul, Ramsey County, MN

  16. Development and performance evaluation of fiber reinforced polymer bridge.

    DOT National Transportation Integrated Search

    2014-03-01

    Fiber reinforced polymers (FRP) have become more popular construction materials in the last decade due to the reduction of : material costs. The installation and performance evaluation of the first FRP-wrapped balsa wood bridge in Louisiana is descri...

  17. Nondestructive evaluation of fiber reinforced polymer bridges and decks.

    DOT National Transportation Integrated Search

    2003-10-01

    The research described herein involved both nondestructive evaluation and destructive testing of an FRP honeycomb specimen. The specimen is representative of an FRP bridge that is to be constructed in Troupsburg, New York. The specimen was tested in ...

  18. Myocardial Bridge

    MedlinePlus

    ... Center > Myocardial Bridge Menu Topics Topics FAQs Myocardial Bridge En español Your heart is made of muscle, ... surface of the heart. What is a myocardial bridge? A myocardial bridge is a band of heart ...

  19. First bridge structure with lightweight high-performance concrete beams and deck in Virginia.

    DOT National Transportation Integrated Search

    2005-01-01

    This study involved the construction and early performance of the first bridge in Virginia constructed with lightweight high-performance concrete (LWHPC) having a density of 120 lb/ft3 in the beams and deck. The design strength and permeability were ...

  20. A probabilistic bridge safety evaluation against floods.

    PubMed

    Liao, Kuo-Wei; Muto, Yasunori; Chen, Wei-Lun; Wu, Bang-Ho

    2016-01-01

    To further capture the influences of uncertain factors on river bridge safety evaluation, a probabilistic approach is adopted. Because this is a systematic and nonlinear problem, MPP-based reliability analyses are not suitable. A sampling approach such as a Monte Carlo simulation (MCS) or importance sampling is often adopted. To enhance the efficiency of the sampling approach, this study utilizes Bayesian least squares support vector machines to construct a response surface followed by an MCS, providing a more precise safety index. Although there are several factors impacting the flood-resistant reliability of a bridge, previous experiences and studies show that the reliability of the bridge itself plays a key role. Thus, the goal of this study is to analyze the system reliability of a selected bridge that includes five limit states. The random variables considered here include the water surface elevation, water velocity, local scour depth, soil property and wind load. Because the first three variables are deeply affected by river hydraulics, a probabilistic HEC-RAS-based simulation is performed to capture the uncertainties in those random variables. The accuracy and variation of our solutions are confirmed by a direct MCS to ensure the applicability of the proposed approach. The results of a numerical example indicate that the proposed approach can efficiently provide an accurate bridge safety evaluation and maintain satisfactory variation.

  1. Design, construction and load testing of the bridge on Arnault Branch, Washington County, Missouri using innovative technologies.

    DOT National Transportation Integrated Search

    2010-02-01

    The superstructure and instrumentation designs of a three-span bridge are presented in this report. The three spans include a : precast box-girder bridge, a precast deck on steel girder and a precast deck on concrete girder. They were designed to com...

  2. Field validation of a drive-by bridge inspection system with wireless BWIM + NDE devices : final report.

    DOT National Transportation Integrated Search

    2016-09-01

    In this project, researchers developed and performed field validation of a wireless structural sensing system for a variety of bridge response measurements, including strain, acceleration, and displacement. The research team used the wireless strain ...

  3. Structure and dynamics of a salt-bridge model system in water and DMSO

    NASA Astrophysics Data System (ADS)

    Lotze, S.; Bakker, H. J.

    2015-06-01

    We study the interaction between the ions methylguanidinium and trifluoroacetate dissolved in D2O and dimethylsulfoxide with linear infrared spectroscopy and femtosecond two-dimensional infrared spectroscopy. These ions constitute model systems for the side chains of arginine and glutamic and aspartic acid that are known to form salt bridges in proteins. We find that the salt-bridge formation of methylguanidinium and trifluoroacetate leads to a significant acceleration of the vibrational relaxation dynamics of the antisymmetric COO stretching vibration of the carboxyl moiety of trifluoroacetate. Salt-bridge formation has little effect on the rate of the spectral fluctuations of the CN stretching vibrations of methylguanidinium. The anisotropy of the cross peaks between the antisymmetric COO stretching vibration of trifluoroacetate and the CN stretching vibrations of methylguanidinium reveals that the salt-bridge is preferentially formed in a bidentate end-on configuration in which the two C=O groups of the carboxylate moiety form strong hydrogen bonds with the two -NH2 groups of methylguanidinium.

  4. Phase I development of an aesthetic, precast concrete bridge rail.

    DOT National Transportation Integrated Search

    2012-02-01

    Precast concrete bridge rail systems offer several advantages over traditional cast-in-place rail designs, including reduced construction : time and costs, installation in a wide range of environmental conditions, easier maintenance and repair, impro...

  5. Seismic evaluation and retrofit of deteriorated concrete bridge components.

    DOT National Transportation Integrated Search

    2013-06-01

    Corrosion of steel bars in reinforced concrete structures is a major durability problem for bridges constructed in the New York State : (NYS). The heavy use of deicing salt compounds this problem. Corrosion of steel bars results in loss of steel cros...

  6. A modified PMMA cement (Sub-cement) for accelerated fatigue testing of cemented implant constructs using cadaveric bone.

    PubMed

    Race, Amos; Miller, Mark A; Mann, Kenneth A

    2008-10-20

    Pre-clinical screening of cemented implant systems could be improved by modeling the longer-term response of the implant/cement/bone construct to cyclic loading. We formulated bone cement with degraded fatigue fracture properties (Sub-cement) such that long-term fatigue could be simulated in short-term cadaver tests. Sub-cement was made by adding a chain-transfer agent to standard polymethylmethacrylate (PMMA) cement. This reduced the molecular weight of the inter-bead matrix without changing reaction-rate or handling characteristics. Static mechanical properties were approximately equivalent to normal cement. Over a physiologically reasonable range of stress-intensity factor, fatigue crack propagation rates for Sub-cement were higher by a factor of 25+/-19. When tested in a simplified 2 1/2-D physical model of a stem-cement-bone system, crack growth from the stem was accelerated by a factor of 100. Sub-cement accelerated both crack initiation and growth rate. Sub-cement is now being evaluated in full stem/cement/femur models.

  7. 37. Photographic copy of the original construction drawing, 1934, by ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    37. Photographic copy of the original construction drawing, 1934, by Sverdrup and Parcel, Consulting Engineers, from microfilm copy at Bridge Division, Missouri Highway and Transportation Department. Stress sheet, continuous span - Mark Twain Memorial Bridge, Spanning Mississippi River at US Route 36, Hannibal, Marion County, MO

  8. Structural health monitoring of I-10 twin span bridge - part I : analysis of lateral load test.

    DOT National Transportation Integrated Search

    2014-11-01

    The old I-10 Twin Span Bridge over Lake Pontchartrain was heavily damaged by the storm surges during : Hurricane Katrina in 2005. A new 5.4-mile long replacement bridge was constructed with higher resistance to : extreme events, such as storm surges ...

  9. Vertical electrical impedance evaluation of asphalt overlays on concrete bridge decks

    NASA Astrophysics Data System (ADS)

    Baxter, Jared S.; Guthrie, W. Spencer; Waters, Tenli; Barton, Jeffrey D.; Mazzeo, Brian A.

    2018-04-01

    Vertical electrical impedance scanning of concrete bridge decks is a non-destructive method for quantifying the degree of protection provided to steel reinforcement against the ingress of corrosive agents. Four concrete bridge decks with asphalt overlays in northern Utah were evaluated using scanning vertical electrical impedance measurements in this study. At the time of testing, the bridges ranged in age from 21 to 34 years, and asphalt overlays had been in place for 7 to 22 years, depending on the bridge. Electrical impedance measurements were collected using a previously constructed apparatus that consisted of six probes spanning a transverse distance of 12 ft. The impedance measurements were compared to surface cracking observations and cores obtained from the same four bridge decks. The results presented in this paper demonstrate the utility of scanning vertical electrical impedance measurements for detecting cracks in asphalt overlays and quantifying their severity. In addition, the results demonstrate the sensitivity of impedance measurements to the presence of an intact membrane beneath the asphalt overlay.

  10. Design of pedestrian truss bridge with Sengon-Rubber laminated veneer lumber

    NASA Astrophysics Data System (ADS)

    Herbudiman, B.; Pranata, Y. A.; Pangestu, L.

    2017-12-01

    Timber bridges are one of the bridge that has long been used, but nowadays, large dimension of sawn timber has limited supply and also it is not environmental-friendly. Laminated veneer lumber (LVL) is a engineered wood that becomes one of the promising alternative, because it is made from lower quality wood that processed to be used as a more quality one. The bridge planned to be a pedestrian truss bridge with length of 9 m, width of 3 m, height of 2.5 m, and using bolt and steel plate as its connection system. Mechanical properties of LVL obtained directly from laboratory test result. Bridge modeling and planning for wood construction refers to SNI 7973:2013, while the loading refers to SNI 1725:2016. Based on the modelling and calculation, the dimension of truss frame and girder beam which are 9 cm x 9 cm and 9 cm x 18 cm have adequate strengths and satisfy deflection requirement.

  11. Seismic fragility analysis of typical pre-1990 bridges due to near- and far-field ground motions

    NASA Astrophysics Data System (ADS)

    Mosleh, Araliya; Razzaghi, Mehran S.; Jara, José; Varum, Humberto

    2016-03-01

    Bridge damages during the past earthquakes caused several physical and economic impacts to transportation systems. Many of the existing bridges in earthquake prone areas are pre-1990 bridges and were designed with out of date regulation codes. The occurrences of strong motions in different parts of the world show every year the vulnerability of these structures. Nonlinear dynamic time history analyses were conducted to assess the seismic vulnerability of typical pre-1990 bridges. A family of existing concrete bridge representative of the most common bridges in the highway system in Iran is studied. The seismic demand consists in a set of far-field and near-field strong motions to evaluate the likelihood of exceeding the seismic capacity of the mentioned bridges. The peak ground accelerations (PGAs) were scaled and applied incrementally to the 3D models to evaluate the seismic performance of the bridges. The superstructure was assumed to remain elastic and the nonlinear behavior in piers was modeled by assigning plastic hinges in columns. In this study the displacement ductility and the PGA are selected as a seismic performance indicator and intensity measure, respectively. The results show that pre-1990 bridges subjected to near-fault ground motions reach minor and moderate damage states.

  12. Compact accelerator for medical therapy

    DOEpatents

    Caporaso, George J.; Chen, Yu-Jiuan; Hawkins, Steven A.; Sampayan, Stephen E.; Paul, Arthur C.

    2010-05-04

    A compact accelerator system having an integrated particle generator-linear accelerator with a compact, small-scale construction capable of producing an energetic (.about.70-250 MeV) proton beam or other nuclei and transporting the beam direction to a medical therapy patient without the need for bending magnets or other hardware often required for remote beam transport. The integrated particle generator-accelerator is actuable as a unitary body on a support structure to enable scanning of a particle beam by direction actuation of the particle generator-accelerator.

  13. Distribution factors for construction loads and girder capacity equations [project summary].

    DOT National Transportation Integrated Search

    2017-03-01

    This project focused on the use of Florida I-beams (FIBs) in bridge construction. University of Florida researchers used analytical models and finite element analysis to update equations used in the design of bridges using FIBs. They were particularl...

  14. 2. HISTORIC PHOTOGRAPH, MERRITT PARKWAY UNDER CONSTRUCTION,LOOKING WEST TO ROUND ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    2. HISTORIC PHOTOGRAPH, MERRITT PARKWAY UNDER CONSTRUCTION,LOOKING WEST TO ROUND HILL ROAD BRIDGE, CA. 1936. COLLECTION OF GEORGE L. LARNED. - Merritt Parkway, Round Hill Road Bridge, Spanning Merritt Parkway at 3.5 mile mark, Greenwich, Fairfield County, CT

  15. Long-Term Structural Health Monitoring System for a High-Speed Railway Bridge Structure.

    PubMed

    Ding, You-Liang; Wang, Gao-Xin; Sun, Peng; Wu, Lai-Yi; Yue, Qing

    2015-01-01

    Nanjing Dashengguan Bridge, which serves as the shared corridor crossing Yangtze River for both Beijing-Shanghai high-speed railway and Shanghai-Wuhan-Chengdu railway, is the first 6-track high-speed railway bridge with the longest span throughout the world. In order to ensure safety and detect the performance deterioration during the long-time service of the bridge, a Structural Health Monitoring (SHM) system has been implemented on this bridge by the application of modern techniques in sensing, testing, computing, and network communication. The SHM system includes various sensors as well as corresponding data acquisition and transmission equipment for automatic data collection. Furthermore, an evaluation system of structural safety has been developed for the real-time condition assessment of this bridge. The mathematical correlation models describing the overall structural behavior of the bridge can be obtained with the support of the health monitoring system, which includes cross-correlation models for accelerations, correlation models between temperature and static strains of steel truss arch, and correlation models between temperature and longitudinal displacements of piers. Some evaluation results using the mean value control chart based on mathematical correlation models are presented in this paper to show the effectiveness of this SHM system in detecting the bridge's abnormal behaviors under the varying environmental conditions such as high-speed trains and environmental temperature.

  16. Long-Term Structural Health Monitoring System for a High-Speed Railway Bridge Structure

    PubMed Central

    Wu, Lai-Yi

    2015-01-01

    Nanjing Dashengguan Bridge, which serves as the shared corridor crossing Yangtze River for both Beijing-Shanghai high-speed railway and Shanghai-Wuhan-Chengdu railway, is the first 6-track high-speed railway bridge with the longest span throughout the world. In order to ensure safety and detect the performance deterioration during the long-time service of the bridge, a Structural Health Monitoring (SHM) system has been implemented on this bridge by the application of modern techniques in sensing, testing, computing, and network communication. The SHM system includes various sensors as well as corresponding data acquisition and transmission equipment for automatic data collection. Furthermore, an evaluation system of structural safety has been developed for the real-time condition assessment of this bridge. The mathematical correlation models describing the overall structural behavior of the bridge can be obtained with the support of the health monitoring system, which includes cross-correlation models for accelerations, correlation models between temperature and static strains of steel truss arch, and correlation models between temperature and longitudinal displacements of piers. Some evaluation results using the mean value control chart based on mathematical correlation models are presented in this paper to show the effectiveness of this SHM system in detecting the bridge's abnormal behaviors under the varying environmental conditions such as high-speed trains and environmental temperature. PMID:26451387

  17. Making Markets for Low-Cost Schooling: The Devices and Investments behind Bridge International Academies

    ERIC Educational Resources Information Center

    Riep, Curtis B.

    2017-01-01

    This paper explores the market-making devices behind Bridge International Academies: a for-profit education company aiming to school millions of nursery and primary aged-students living on less than $2 per day. A wide variety of devices are utilised by Bridge International Academies to construct mass markets for low-cost schooling, including GPS…

  18. Big data and high-performance analytics in structural health monitoring for bridge management

    NASA Astrophysics Data System (ADS)

    Alampalli, Sharada; Alampalli, Sandeep; Ettouney, Mohammed

    2016-04-01

    Structural Health Monitoring (SHM) can be a vital tool for effective bridge management. Combining large data sets from multiple sources to create a data-driven decision-making framework is crucial for the success of SHM. This paper presents a big data analytics framework that combines multiple data sets correlated with functional relatedness to convert data into actionable information that empowers risk-based decision-making. The integrated data environment incorporates near real-time streams of semi-structured data from remote sensors, historical visual inspection data, and observations from structural analysis models to monitor, assess, and manage risks associated with the aging bridge inventories. Accelerated processing of dataset is made possible by four technologies: cloud computing, relational database processing, support from NOSQL database, and in-memory analytics. The framework is being validated on a railroad corridor that can be subjected to multiple hazards. The framework enables to compute reliability indices for critical bridge components and individual bridge spans. In addition, framework includes a risk-based decision-making process that enumerate costs and consequences of poor bridge performance at span- and network-levels when rail networks are exposed to natural hazard events such as floods and earthquakes. Big data and high-performance analytics enable insights to assist bridge owners to address problems faster.

  19. Heat-curved girders : deflections and camber loss during and subsequent to bridge construction.

    DOT National Transportation Integrated Search

    1982-01-01

    The present AASHTO bridge design specifications require that additional camber be built into steel girders that are to be heat curved. The additional camber is provided to allow for subsequent losses due to the dissipation of residual stresses impose...

  20. 45. Photographic copy of the original construction drawing, 1934, by ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    45. Photographic copy of the original construction drawing, 1934, by Sverdrup and Parcel, Consulting Engineers, from microfilm copy at Bridge Division, Missouri Highway and Transportation Department. Cross section--300-ft. span - Mark Twain Memorial Bridge, Spanning Mississippi River at US Route 36, Hannibal, Marion County, MO