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...

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.

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...

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...

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. ...

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...

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...

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 ...

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...

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 ...

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...

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...

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...

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 ...

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...

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...

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...

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...

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...

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...

Bond of Field-Cast Grouts to Precast Concrete Elements

DOT National Transportation Integrated Search

2017-01-01

The performance of connections between prefabricated concrete elements constructed using field-cast cementitious grouts and groutlike materials is becoming a focus area for accelerated bridge construction (ABC) projects. These connections are require...

Seismic Behavior and Design of Segmental Precast Post-Tensioned Concrete Piers

DOT National Transportation Integrated Search

2011-06-01

Segmental precast column construction is an economic environmental friendly solution to accelerate bridge construction in the United : States. Also, concrete-filled fiber reinforced polymer tubes (CFFT) represents a potential economic solution for du...

Iowa ABC connections.

DOT National Transportation Integrated Search

2015-06-01

For several years the Iowa Department of Transportation (DOT), Iowa State University, the Federal Highway Administration, : and several Iowa counties have been working to develop accelerated bridge construction (ABC) concepts, details, and processes....

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...

Iowa ABC connections : [tech transfer summary].

DOT National Transportation Integrated Search

2015-06-01

The Iowa Department of Transportation (DOT) and other organizations have : been developing accelerated bridge construction (ABC) concepts, details, and : processes, and Iowa has come to be viewed as a national leader in the area of : ABC. However, th...

Precast, Prestressed Concrete Bent Caps : Volume 1, Preliminary Design Considerations and Experimental Test Program

DOT National Transportation Integrated Search

2018-04-01

Precast prestressed concrete bent caps may provide significant benefits by enabling accelerated construction of bridge substructures and improve longevity by reducing the propensity for cracking. The Texas Department of Transportation enables the use...

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 ...

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.

Development of Non-Proprietary Ultra-High Performance Concrete for Use in the Highway Bridge Sector : TechBrief

DOT National Transportation Integrated Search

2013-10-01

The long-term goals of this study are to facilitate the use of ultra-high performance concrete (UHPC) among U.S. suppliers and contractors, accelerate its application in U.S. construction, and promote a more resilient and sustainable future U.S. infr...

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.

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.

Operational Modal Analysis of the Cablestayed Footbridge

NASA Astrophysics Data System (ADS)

Kortiš, Ján; Daniel, Ľuboš; Farbák, Matúš; Maliar, Lukáš; Škarupa, Milan

2017-12-01

Modern architecture leads to design subtle bridge structures that are more sensitive to increased dynamic loading than the massive ones. This phenomenon can be especially observed on lightweight steel structures such as suspended footbridges. As a result, it is necessary to know precisely its dynamic characteristics, such as natural frequencies, natural shapes and damping of construction. This information can be used for further analysis such as damage detection, system identification, health monitoring, etc. or also for the design of new types of construction. For this purpose, classical modal analysis using trigger load or harmonic vibration exciter in combination with acceleration sensors is used in practice. However, there are many situations where it is not possible to stop the traffic or operation of the bridge. The article presents an experimental measurement of the dynamic parameters of the structure at the operating load using the operational modal analysis.

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. ...

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.

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...

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.

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.

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

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

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...

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...

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 earthquakes. Findings from this study will contribute to the development of revised guidelines to address vertical ground motion effects, particularly in the near fault regions, in the seismic design of highway bridges.

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.

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...

Dibenzosiloles and 12H-indololo[3,2-d]naphtho[1,2-b][1]siloles: exploration of organic chromophores exhibiting efficient solid-state fluorescence.

PubMed

Shimizu, Masaki

2015-02-01

The construction of a diorganosilylene bridge over a biaryl moiety at the 2,2'-positions is a versatile strategy for fine-tuning its HOMO-LUMO energy gap, which is closely linked to the electronic and optical properties of the compounds. Therefore, there is growing interest in the use of silicon-bridged biaryl motifs as key cores of various types of advanced functional materials, such as light-emitting, semiconducting, photovoltaic, and sensing materials. To accelerate the advances of materials based on silicon-bridged biaryls, it is essential to create new classes of biaryls and explore their functions and properties. This Personal Account describes recent research on the development of organic chromophores based on functionalized dibenzosiloles and 12H-indololo[3,2-d]naphtho[1,2-b][1]siloles as solid-state emitters. Copyright © 2014 The Chemical Society of Japan and Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

RF control at SSCL — an object oriented design approach

NASA Astrophysics Data System (ADS)

Dohan, D. A.; Osberg, E.; Biggs, R.; Bossom, J.; Chillara, K.; Richter, R.; Wade, D.

1994-12-01

The Superconducting Super Collider (SSC) in Texas, the construction of which was stopped in 1994, would have represented a major challenge in accelerator research and development. This paper addresses the issues encountered in the parallel design and construction of the control systems for the RF equipment for the five accelerators comprising the SSC. An extensive analysis of the components of the RF control systems has been undertaken, based upon the Schlaer-Mellor object-oriented analysis and design (OOA/OOD) methodology. The RF subsystem components such as amplifiers, tubes, power supplies, PID loops, etc. were analyzed to produce OOA information, behavior and process models. Using these models, OOD was iteratively applied to develop a generic RF control system design. This paper describes the results of this analysis and the development of 'bridges' between the analysis objects, and the EPICS-based software and underlying VME-based hardware architectures. The application of this approach to several of the SSCL RF control systems is discussed.

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...

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...

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...

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 impulse under the bridge, about second bridge (M5973 Brodno). The analysis was done in the software of Sigview. About the first bridge (D201 - 00), the analysis output were values of power spectral density adherent to the frequencies values. These frequencies were compared with the natural frequencies values from the computational model whereby the technical seismicity influence on bridge natural frequencies was found out. About the second bridge (M5973 Brodno), the Sigview display of recorded vibration velocity time history was compared with the final vibration velocity time history from the computational model, whereby the results were incidental.

+Gz-induced post-cholecystectomy syndrome in rabbit model by using a telemetric method

PubMed Central

Kong, Yalin; Zhao, Gang; Li, Yifeng; Wen, Dongqing; Zhang, Hui; He, Xiaojun; Zhen, Yuying; Zhang, Hongyi

2015-01-01

Aviation-related mechanism may exist in the post-cholecystectomy syndrome (PCS) of aircrew patients. The aim of this study was to test this hypothesis on vivo rabbit model and to explore the mechanism by using a novel telemetric method. We constructed a bile duct-to-intestinal bridge bypass on 30 rabbits, with a telemetry implant attached to the Oddi’s sphincter. Then a telemetric recording system was used to record the biliary pressure fluctuation through the subcutaneous bridge and the changes of electromyography of the Oddi’s sphincter under different +Gz acceleration. Self-control comparison was made before and after cholecystectomy. The fully implantable device was very well accepted by rabbits and the data could reflect the real experimental environment simultaneously. Biliary pressure in common bile duct increased accordingly with +Gz acceleration increased, but bile secretion didn’t change. Although +Gz acceleration could increase the frequency of burst of spike potentials in the Oddi’s sphincter, the frequency didn’t change with the +Gz acceleration increased, and the spike activity didn’t change obviously before cholecystectomy. After cholecystectomy, the biliary pressure in common bile duct remained high in 12 rabbits (40%) under +Gz exposure, and the pressure value didn’t change as the +Gz acceleration increased. The long-time changes in electromyography of the Oddi’s sphincter were observed in the same 12 rabbits, with symptoms of PCS developed in 9 of them. +Gz exposure is an important external factor leading to the biliary physiology disorder, and it may induce PCS in some aircrew patients with individual susceptibility, which means gallbladder maybe a dominant factor in regulating the biliary physiology in theses aircrew patients. PMID:26064268

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...

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...

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...

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...

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

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

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.

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...

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...

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...

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...

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...

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...

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...

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.

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

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

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...

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...

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...

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...

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...

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...

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.

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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.

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...

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...

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 ...

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...

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.

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.

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

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.

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...

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...

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.

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...

Microelectromechanical inertial sensor

DOEpatents

Okandan, Murat [Edgewood, NM; Nielson, Gregory N [Albuquerque, NM

2012-06-26

A microelectromechanical (MEM) inertial sensor is disclosed which can be used to sense a linear acceleration, or a Coriolis acceleration due to an angular rotation rate, or both. The MEM inertial sensor has a proof mass which is supported on a bridge extending across an opening through a substrate, with the proof mass being balanced on the bridge by a pivot, or suspended from the bridge by the pivot. The proof mass can be oscillated in a tangential direction in the plane of the substrate, with any out-of-plane movement of the proof mass in response to a sensed acceleration being optically detected using transmission gratings located about an outer edge of the proof mass to generate a diffracted light pattern which changes with the out-of-plane movement of the proof mass.

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.

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

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...

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...

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...

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...

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...

Highly accelerated lifetime for externally applied bond critical fiber-reinforced polymer (FRP) infrastructure materials : [summary].

DOT National Transportation Integrated Search

2014-03-01

The Florida Department of Transportation (FDOT) uses fiber-reinforced polymer (FRP) composites to repair bridges and strengthen bridge decks. Proven mechanical characteristics make FRP composites cost-effective in extending the life span of bridges o...

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...

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...

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

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

78 FR 55337 - Buy America Waiver Notification

Federal Register 2010, 2011, 2012, 2013, 2014

2013-09-10

... components for construction of Monon Trail Bridge over SR 25 in Indiana. DATES: The effective date of the... bridge components for construction of Monon Trail Bridge over SR 25 in Indiana. The Indiana Department of Transportation (INDOT) requested this waiver for an overpass to carry the Monon High Bridge Trail across the new...

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...

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...

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...

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...

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...

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...

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

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.

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 will provide enough information to document non-permissible movements of the Juarez Bridge. Finally, guidance for future retrofit of the structure will be fully available.

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

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...

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...

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...

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...

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 ...

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

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.

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...

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.

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 ...

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

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…

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...

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...

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...

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...

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...

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...

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

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

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

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

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

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 ...

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

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.

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...

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...

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...

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...

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 ...

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.

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...

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.

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.

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....

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.

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...

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.

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

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.

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...

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...

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...

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...

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

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...

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...

78 FR 2371 - Taking of Marine Mammals Incidental to Specified Activities; Construction of the East Span of the...

Federal Register 2010, 2011, 2012, 2013, 2014

2013-01-11

...-Oakland Bay Bridge AGENCY: National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric..., harbor porpoises, and gray whales, by harassment, incidental to construction of a replacement bridge for the East Span of the San Francisco-Oakland Bay Bridge (SF- OBB) in California. DATES: This...

Damage identification of supporting structures with a moving sensory system

NASA Astrophysics Data System (ADS)

Zhu, X. Q.; Law, S. S.; Huang, L.; Zhu, S. Y.

2018-02-01

An innovative approach to identify local anomalies in a structural beam bridge with an instrumented vehicle moving as a sensory system across the bridge. Accelerations at both the axle and vehicle body are measured from which vehicle-bridge interaction force on the structure is determined. Local anomalies of the structure are estimated from this interaction force with the Newton's iterative method basing on the homotopy continuation method. Numerical results with the vehicle moving over simply supported or continuous beams show that the acceleration responses from the vehicle or the bridge structure are less sensitive to the local damages than the interaction force between the wheel and the structure. Effects of different movement patterns and moving speed of the vehicle are investigated, and the effect of measurement noise on the identified results is discussed. A heavier or slower vehicle has been shown to be less sensitive to measurement noise giving more accurate results.

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.

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...

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...

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...

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...

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...

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.

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 parameters of bridge structures. The GNSS can monitor the working state of bridges effectively and accurately. Research results can provide references to evaluate the bearing capacity, safety performance, and durability of bridge structures during operation.

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 parameters of bridge structures. The GNSS can monitor the working state of bridges effectively and accurately. Research results can provide references to evaluate the bearing capacity, safety performance, and durability of bridge structures during operation. PMID:28241472

Inventory and Evaluation of Engineering Cultural Resources: Montgomery to Gadsden, Alabama Coosa River, Alabama,

DTIC Science & Technology

1981-03-01

to retain some of its aesthetic quality. Important bridges were also being constructed outside of France. The Westminister Bridge (1738-50) was built... Legislative Session. It was eventually to connect the waters of Mobile Bay with the Coosa River at Wetumpka, and eventually with the Tennessee. The project...Bridge Act of 1927 were important legislative aids. The state act resulted in the construction of fifteen major bridges, including the attractive

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…

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

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

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

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

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

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

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

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

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

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

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

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...

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.

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...

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...

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

Application of optoelectronic sensors for precise, automatic monitoring of vibration, tilt, and deformation of building subjected to static and dynamic effects of the environment

NASA Astrophysics Data System (ADS)

Bochenek, Wojciech; Passia, Henryk; Szade, Adam

2003-09-01

A measuring system composed of optoelectronic and electronic sensors was constructed. These are: laser tilt sensor (CMI- developed), acceleration sensor, and the one to measure the propagation fissures. They are characterized by high precision of measurement, combined with automatic, multichannel data acquisition. These assemblies of sensors are installed in the buildings and industrial structures such as: churches, hospitals, chimneys, bridges, towers, apartment buildings for which particular protection is needed because of adverse impacts of environmental agents such as mining, water and climatic conditions. The paper presents examples of application, illustrated by the most interesting results of measurements.

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...

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

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...

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

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

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.

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 ...

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...

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 ...

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...

A 1-2 GHz pulsed and continuous wave electron paramagnetic resonance spectrometer

NASA Astrophysics Data System (ADS)

Quine, Richard W.; Rinard, George A.; Ghim, Barnard T.; Eaton, Sandra S.; Eaton, Gareth R.

1996-07-01

A microwave bridge has been constructed that performs three types of electron paramagnetic resonance experiments: continuous wave, pulsed saturation recovery, and pulsed electron spin echo. Switching between experiment types can be accomplished via front-panel switches without moving the sample. Design features and performance of the bridge and of a resonator used in testing the bridge are described. The bridge is constructed of coaxial components connected with semirigid cable. Particular attention has been paid to low-noise design of the preamplifier and stability of automatic frequency control circuits. The bridge incorporates a Smith chart display and phase adjustment meter for ease of tuning.

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 ...

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

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

Flexural anchorage performance at diagonal crack locations.

DOT National Transportation Integrated Search

2010-12-01

Large numbers of reinforced concrete deck girder bridges that were constructed during the interstate system expansion of the 1950s have developed diagonal cracking in the stems. Though compliant with design codes when constructed, many of these bridg...

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...

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

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 ...

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.

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.

78 FR 56605 - Drawbridge Operation Regulation; Lafourche Bayou, Larose, LA

Federal Register 2010, 2011, 2012, 2013, 2014

2013-09-13

... reference to the SR 310 (Larose Pontoon) Bridge with the LA 657 (Larose) Vertical Lift Bridge. The SR 310...) Vertical Lift Bridge, which is located approximately one-half mile away from the old bridge. The old SR 310....1. This bridge has been replaced by the newly constructed LA 657 (Larose) Vertical Lift Bridge...

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...

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...

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.

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...

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...

Flexural anchorage performance at diagonal crack locations : final report.

DOT National Transportation Integrated Search

2010-12-01

Large numbers of reinforced concrete deck girder bridges that were constructed during the interstate system expansion of the 1950s have developed diagonal cracking in the stems. Though compliant with design codes when constructed, many of these bridg...

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...

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...

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...

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...

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 ...

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...

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...

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 ...

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 ...

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...

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 ...

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...

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

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...

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...

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...

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

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...

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...

Analysis and estimation of service life of corrosion prevention materials using diffusion, resistivity and accelerated curing for new bridge structures : [summary].

DOT National Transportation Integrated Search

2014-01-01

Much infrastructure on Floridas coasts relies : on steel-reinforced concrete that is exposed : to seawater. Corrosion of steel reinforcing bars : (rebar) in concrete exposed to seawater has : been documented as a major cause of bridge : deteriorat...

Cane Creek flood-flow characteristics at State Route 30 near Spencer, Tennessee

USGS Publications Warehouse

Gamble, Charles R.

1983-01-01

The Tennessee Department of Transportation has constructed a new bridge and approaches on State Route 30 over Cane Creek near Spencer, Tennessee. The old bridge and its approaches were fairly low, permitting considerable flow over the road during high floods. The new bridge and its approaches are considerably higher, causing different flow conditions at the site. Analysis of the effects of the new bridge, as compared to the old bridge, on floods of the magnitude of the May 27, 1973, flood is presented. The May 27, 1973, flood was greater than a 100-year flood. Analysis of the 50- and 100-year floods for the new bridge are also presented. Results of the study indicate that the new construction will increase the water-surface elevation for a flood equal to the May 27, 1973, flood by approximately 1 foot upstream from bridge. (USGS)

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

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 ...

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...

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...

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...

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

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...

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...

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...

"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

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

Superconducting six-axis accelerometer

NASA Technical Reports Server (NTRS)

Paik, H. J.

1990-01-01

A new superconducting accelerometer, capable of measuring both linear and angular accelerations, is under development at the University of Maryland. A single superconducting proof mass is magnetically levitated against gravity or any other proof force. Its relative positions and orientations with respect to the platform are monitored by six superconducting inductance bridges sharing a single amplifier, called the Superconducting Quantum Interference Device (SQUID). The six degrees of freedom, the three linear acceleration components and the three angular acceleration components, of the platform are measured simultaneously. In order to improve the linearity and the dynamic range of the instrument, the demodulated outputs of the SQUID are fed back to appropriate levitation coils so that the proof mass remains at the null position for all six inductance bridges. The expected intrinsic noise of the instrument is 4 x 10(exp -12)m s(exp -2) Hz(exp -1/2) for linear acceleration and 3 x 10(exp -11) rad s(exp -2) Hz(exp -1/2) for angular acceleration in 1-g environment. In 0-g, the linear acceleration sensitivity of the superconducting accelerometer could be improved by two orders of magnitude. The design and the operating principle of a laboratory prototype of the new instrument is discussed.

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.

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...

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 ...

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 ...

Long-term behavior of integral abutment bridges : appendix C, US231 over railroad spur 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...

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...

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 ...

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...

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.

9. Photocopy of photograph original print located in collection of ...

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

9. Photocopy of photograph original print located in collection of William H. Caruthers, Jr., Richmond, Virginia, and loaned by Susan A. Harter, Tempe, Arizona. Photographer assumed to be William H. Caruthers, Sr., assistant (construction) engineer for the Ash Avenue Bridge, 1912 VIEW OF ASH AVENUE BRIDGE UNDER CONSTRUCTION, LOOKING NORTH, SHOWING STEEL REINFORCEMENT IN DECK BEFORE PLACEMENT OF CONCRETE - Ash Avenue Bridge, Spanning Salt River at Foot of Ash Avenue, Tempe, Maricopa County, AZ

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 contact force and pressure. Bridging suture tension did not significantly affect ultimate failure loads. Considering the risks of overtensioning bridging sutures, it may be clinically more beneficial to keep bridging suture tension below 90 N. © 2015 The Author(s).

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

Stay-in-place bridge deck forms, a state of the art review. Prestressed panel subdecks.

DOT National Transportation Integrated Search

1973-01-01

The results of prior research conducted on precast prestressed panel subdecks for use in the construction of bridge decks are reviewed and summarized. This construction technique utilizes the precast panel subdecks as the forming for the cast-in-plac...

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...

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...

75 FR 27428 - Safety Standards for Steel Erection

Federal Register 2010, 2011, 2012, 2013, 2014

2010-05-17

... in National Highway System construction projects to comply with a number of standards, policies, and...://www.fhwa.dot.gov/bridge/lrfd/index.htm .) For projects involving bridge construction (e.g., temporary... of these requirements will enhance the safety of employees operating on or near structural steel...

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.

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...

NPSNET: Dynamic Terrain and Cultured Feature Depiction

DTIC Science & Technology

1992-09-01

defaults. bridge(terrain *ptr, vertex pos, bridge mattype bmat ); This constructor takes only the pointer to the underlying terrain, a placement, and a...material to use for construction. bridge(terrain *ptr, vertex pos, bridge-mattype bmat , float dir); This constructor takes a terrain pointer, a...placement position, a material to use, and a direction to run. bridge(terrain *ptr, vertex pos, bridge-mattype bmat , float dir, float width, float height

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.

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...

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 ...

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...

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...

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...

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...

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...

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...

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...

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.

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.

41. Photographic copy of the original construction drawing, 192627, by ...

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

41. Photographic copy of the original construction drawing, 1926-27, by Harrington, Howard, and Ash, Consulting Engineers, from microfilm copy at Bridge Division, Missouri Highway and Transportation Department, Jefferson City, Missouri. STRESS SHEET - Cape Girardeau Bridge, Spanning Mississippi River at State Highway 146, Cape Girardeau, Cape Girardeau County, MO

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

44. Photographic copy of the original construction drawing, 1934, by ...

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

44. 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. Details of 300-ft. span - Mark Twain Memorial Bridge, Spanning Mississippi River at US Route 36, Hannibal, Marion County, MO

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...

Use of high performance, high strength concrete (HPC) bulb-tee girders saves millions on I-10 twin span bridge in New Orleans district.

DOT National Transportation Integrated Search

2005-01-01

History: LADOTD has been gradually introducing high performance, high strength concrete into its bridge construction program. At the same time, LTRC has been sponsoring research work to address design and construction issues related to the utilizatio...

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.

10. Photocopy of photograph original print located in collection of ...

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

10. Photocopy of photograph original print located in collection of William H. Caruthers, Jr., Richmond, Virginia, and loaned by Susan A. Hatter, Tempe, Arizona. Photographer assumed to be William H. Caruthers, Sr., assistant (construction) engineer for the Ash Avenue Bridge, 1912 VIEW, LOOKING NORTH, SHOWING ASH AVENUE BRIDGE UNDER CONSTRUCTION. WORK IS PROGRESSING FROM THE SOUTH BANK TO THE NORTH BANK OF THE SALT RIVER - Ash Avenue Bridge, Spanning Salt River at Foot of Ash Avenue, Tempe, Maricopa County, AZ

Evaluation of surface modification methods to mitigate rusting and pitting in weathering steel bridges : final report.

DOT National Transportation Integrated Search

1986-09-01

Accelerated laboratory atmospheric exposure simulation tests with an acceleration factor of 50 and extending for a maximum of 2200 wet-dry cycles (6-year exposure equivalent) gave corrosion loss data that agreed fairly well with the field data derive...

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...

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

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...

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...

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

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.

Photoinduced electron transfer in covalent ruthenium-anthraquinone dyads: relative importance of driving-force, solvent polarity, and donor-bridge energy gap.

PubMed

Hankache, Jihane; Wenger, Oliver S

2012-02-28

Four rigid rod-like molecules comprised of a Ru(bpy)(3)(2+) (bpy = 2,2'-bipyridine) photosensitizer, a 9,10-anthraquinone electron acceptor, and a molecular bridge connecting the two redox partners were synthesized and investigated by optical spectroscopic and electrochemical means. An attempt was made to assess the relative importance of driving-force, solvent polarity, and bridge variation on the rates of photoinduced electron transfer in these molecules. Expectedly, introduction of tert-butyl substituents in the bipyridine ligands of the ruthenium complex and a change in solvent from dichloromethane to acetonitrile lead to a significant acceleration of charge transfer rates. In dichloromethane, photoinduced electron transfer is not competitive with the inherent excited-state deactivation processes of the photosensitizer. In acetonitrile, an increase in driving-force by 0.2 eV through attachment of tert-butyl substituents to the bpy ancillary ligands causes an increase in electron transfer rates by an order of magnitude. Replacement of a p-xylene bridge by a p-dimethoxybenzene spacer entails an acceleration of charge transfer rates by a factor of 3.5. In the dyads from this study, the relative order of importance of individual influences on electron transfer rates is therefore as follows: solvent polarity ≥ driving-force > donor-bridge energy gap.

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.

Acoustic energy propagation around railways

NASA Astrophysics Data System (ADS)

Cizkova, Petra

2017-09-01

The article deals with the issues of acoustic energy propagation around railways. The research subject was noise emission spreading into the surroundings during the passage of trains over a directly travelled steel bridge construction. Noise emissions were measured using direct measurements in the field. The measurements were performed in two measurement profiles. The noise exposures A LAE measured near the steel bridge construction were compared against the noise exposures A LAE captured on an open track. From the difference of these data, the noise level of the steel bridge structure was determined. Part of the research was to evaluate the effect of the reconstruction of the railway track superstructure on the acoustic situation in the given section of the railway track. The article describes the methodology of measurements, including the processing and evaluation of measured data. The article points out the noise levels of the steel bridge construction and assesses changes in the acoustic situation after the reconstruction.

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...

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...

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...

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...

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.

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,...

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...

Backwater effects of Piers in Subcritical Flow

DOT National Transportation Integrated Search

2001-10-01

Construction or renovation of bridge structures may require placement of bridge piers within the channel or floodplain of natural waterways. These piers will obstruct the flow and may cause an increase in water levels upstream of the bridge structure...

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 ...

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...

Elevated temperature properties of weathering steel.

DOT National Transportation Integrated Search

2014-01-01

In recent decades, bridge fires have become a major concern in the U.S. Fire hazard in bridges can result in significant economic and public losses. New construction of bridges often use Weathering Steel (also known as Corten Steel), whic...

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...

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 :...

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...

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…

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...

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.

20. Photographic copy of the original construction drawing, 193031, by ...

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

20. Photographic copy of the original construction drawing, 1930-31, by Sverdrup and Parcel, Consulting Engineers, from microfilm copy at Bridge Division, Missouri Highway and Transportation Department, Jefferson City, Missouri. Truss stress diagram, and plans of laterals and sway braces - Gasconade Bridge, Spanning Gasconade River at State Route 100, Gasconade, Gasconade County, MO

11. Photographic copy of lines drawing of original construction (24 ...

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

11. Photographic copy of lines drawing of original construction (24 January 1911, in possession of St. Louis County Bridge Engineer, Virginia, Minnesota). Profile of main and approach spans; plan and sectional view of concrete river pier - Brosseau Road Bridge, County Road 694 spanning Cloquet at River, Burnett, St. Louis County, MN

75 FR 4612 - Agency Information Collection Activities: Notice of Request for Extension of Currently Approved...

Federal Register 2010, 2011, 2012, 2013, 2014

2010-01-28

... construction time and traffic congestion; C. The development of engineering design criteria for innovative products, materials, and structural systems for use in highway bridges and structures; D. The reduction of... construction, repair, and rehabilitation of bridges and other highway structures. This program was funded by...

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...

Research on Influencing Factors and Generalized Power of Synthetic Artificial Seismic Wave

NASA Astrophysics Data System (ADS)

Jiang, Yanpei

2018-05-01

Start your abstract here… In this paper, according to the trigonometric series method, the author adopts different envelope functions and the acceleration design spectrum in Seismic Code For Urban Bridge Design to simulate the seismic acceleration time history which meets the engineering accuracy requirements by modifying and iterating the initial wave. Spectral analysis is carried out to find out the the distribution law of the changing frequencies of the energy of seismic time history and to determine the main factors that affect the acceleration amplitude spectrum and energy spectrum density. The generalized power formula of seismic time history is derived from the discrete energy integral formula and the author studied the changing characteristics of generalized power of the seismic time history under different envelop functions. Examples are analyzed to illustrate that generalized power can measure the seismic performance of bridges.

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...

Corrosion resistance of grouted post-tensioning systems : [summary].

DOT National Transportation Integrated Search

2013-08-01

The increased popularity of post-tensioned bridge construction in the United States has led to concerns about corrosion and its impact on the life cycle of these bridges. Although the vast majority of post-tensioned bridges in the United States have ...

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 ...

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...

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 ...

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...

Concrete box-beam deterioration, phase II : appendices.

DOT National Transportation Integrated Search

2009-04-13

Side-by-side box-beam bridge constitutes approximately 17 percent of bridges built or replaced annually on public roads and there is a renewed thrust to use this bridge type for rapid construction under the Highway for LIFE program. Further, failure ...

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...

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...

Reflective Cracking between Precast Prestressed Box Girders

DOT National Transportation Integrated Search

2017-06-30

The adjacent precast prestressed concrete box-beam bridge is the bridge of choice for short and short-to-medium span bridges. This choice is because of the ease of construction, favorable span-to-depth ratios, aesthetic appeal, and high torsional sti...

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.

Bridging the gap between system and cell: The role of ultra-high field MRI in human neuroscience.

PubMed

Turner, Robert; De Haan, Daniel

2017-01-01

The volume of published research at the levels of systems and cellular neuroscience continues to increase at an accelerating rate. At the same time, progress in psychiatric medicine has stagnated and scientific confidence in cognitive psychology research is under threat due to careless analysis methods and underpowered experiments. With the advent of ultra-high field MRI, with submillimeter image voxels, imaging neuroscience holds the potential to bridge the cellular and systems levels. Use of these accurate and precisely localized quantitative measures of brain activity may go far in providing more secure foundations for psychology, and hence for more appropriate treatment and management of psychiatric illness. However, fundamental issues regarding the construction of testable mechanistic models using imaging data require careful consideration. This chapter summarizes the characteristics of acceptable models of brain function and provides concise descriptions of the relevant types of neuroimaging data that have recently become available. Approaches to data-driven experiments and analyses are described that may lead to more realistic conceptions of the competences of neural assemblages, as they vary across the brain's complex neuroanatomy. © 2017 Elsevier B.V. All rights reserved.

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...

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....

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;...

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...

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…

A case study of interior low-frequency noise from box-shaped bridge girders induced by running trains: Its mechanism, prediction and countermeasures

NASA Astrophysics Data System (ADS)

Zhang, Xun; Li, Xiaozhen; Hao, Hong; Wang, Dangxiong; Li, Yadong

2016-04-01

A side effect of high-speed railway and urban rail transit systems is the associated vibration and noise. Since the use of concrete viaducts is predominant in railway construction due to scarce land resources, low-frequency (20-200 Hz) structure-radiated noise from concrete bridges is a principal concern. Although it is the most commonly used bridge type, the mechanism of noise emission from box-shaped bridge girders when subjected to impact forces from moving trains, which sounds like beating a drum, has not been well studied. In this study, a field measurement was first made on a simply-supported box-shaped bridge to record the acceleration of the slabs and the associated sound pressures induced by running trains. These data indicated that a significant beat-wave noise occurred in the box-shaped cavity when the train speed was around 340 km/h, which arose from the interference between two sound waves of 75.0 Hz and 78.8 Hz. The noise leakage from the bridge expansion joint was serious and resulted in obvious noise pollution near the bridge once the beat-wave noise was generated in the cavity. The dominant frequency of the interior noise at 75.0 Hz was confirmed from the spectrum of the data and the modal analysis results, and originated from the peak vibration of the top slab due to resonance and the first-order vertical acoustic mode, which led to cavity resonance, amplifying the corresponding noise. The three-dimensional acoustic modes and local vibration modes of the slab were calculated by using the finite element method. A simplified vehicle-track-bridge coupling vibration model was then developed to calculate the wheel-rail interaction force in a frequency range of 20-200 Hz. Numerical simulations using the boundary element method confirmed the cavity resonance effect and the numerical results agreed well with the data. Based on the calibrated numerical model, three noise reduction measures, i.e., adding a horizontal baffle in the interior cavity, narrowing the width of top slab by reducing the inclination angle of the webs, and using a softer fastener on the track, were found to be effective and practical for reducing the noise generated by high-speed trains.

Photographic copy of circa 1934, 10” x 15”, black and ...

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

Photographic copy of circa 1934, 10” x 15”, black and white aerial photograph. Loose in oversized box located at the National Museum of American History, Smithsonian Institution, Archives Center, Work and Industry Division, Washington, D.C. Original Photographer unknown. AERIAL PHOTOGRAPH OF BRIDGE UNDER CONSTRUCTION FROM WEST BANK LOOKING NORTH TOWARD EAST BANK DOWN RIVER SHOWING OVERALL VIEW OF BRIDGE PIER CONSTRUCTION. - Huey P. Long Bridge, Spanning Mississippi River approximately midway between nine & twelve mile points upstream from & west of New Orleans, Jefferson, Jefferson Parish, LA

Hydraulic analysis, Paint Creek at State Route 772, Chillicothe, Ohio

USGS Publications Warehouse

Mayo, R.I.; Bartlett, W.P.

1981-01-01

The Ohio Department of Transportation, Division of Highways, proposes to replace a three-span arch, bridge across Paint Creek on South Paint Street in Chillicothe, Ohio with a new deck-type structure resting on four sets of piles and four piers. Profiles of the 10-, 25-, 50- and 100-year floods under present conditions and under conditions modified by constructions of the new bridge are presented in this report. The results indicate that the construction of the new bridge will not cause significant changes in the flood profiles or the areas inundated.

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...

Evaluation of continuity detail for precast prestressed girders : research project capsule.

DOT National Transportation Integrated Search

2008-03-01

The construction of a new bridge : crossing the Mississippi River north of : Baton Rouge is currently underway. The : project, named the John James : Audubon Bridge, is a true landmark. Its : main span will be the longest cablestayed : bridge in Nort...

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...

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...

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

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...

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...

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 ...

Post-tensioning technologies.

DOT National Transportation Integrated Search

2013-04-01

Posttensioned bridge construction has become increasingly popular and financially competitive with traditional prestressed concrete : and steel plate girder bridges. Unfortunately, Indiana has experienced several constructionrelated problems in...

77 FR 67563 - Regulated Navigation Area-New Haven Harbor, Quinnipiac River, Mill River, New Haven, CT; Pearl...

Federal Register 2010, 2011, 2012, 2013, 2014

2012-11-13

...; Pearl Harbor Memorial Bridge (Interstate 95) Construction AGENCY: Coast Guard, DHS. ACTION: Final rule... construction of the new Pearl Harbor Memorial Bridge, and which could be needed at other times as well. This..., call or email Petty Officer Joseph Graun, Prevention Department, U.S. Coast Guard Sector Long Island...

77 FR 47331 - Regulated Navigation Area-New Haven Harbor, Quinnipiac River, Mill River, New Haven, CT; Pearl...

Federal Register 2010, 2011, 2012, 2013, 2014

2012-08-08

... Harbor Memorial Bridge (Interstate 95) Construction AGENCY: Coast Guard, DHS. ACTION: Notice of proposed... needed during construction of the new Pearl Harbor Memorial Bridge, and which could be needed at other... Department, U. S. Coast Guard Sector Long Island Sound, (203) 468-4544, [email protected] ; or...

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...

Field comparison of the installation and cost of placement of epoxy-coated and MMFX 2 steel deck reinforcement : establishing a baseline for future deck monitoring.

DOT National Transportation Integrated Search

2009-01-01

As part of the Innovative Bridge Research and Construction Program (IBRCP), this study was conducted to use the full-scale construction project of the Route 123 Bridge over the Occoquan River in Northern Virginia to identify and compare any differenc...

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,…

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…

Building the Bridge between Science and Practice: Essential Characteristics of a Translational Framework

ERIC Educational Resources Information Center

Stafford-Brizard, K. Brooke; Cantor, Pamela; Rose, L. Todd

2017-01-01

Mind, brain, and education is a field developed with two key purposes: (1) to accelerate the knowledge developed through research by using an interdisciplinary approach, and (2) to create a bridge to connect and apply this knowledge to educational practice. While great progress has been made with regard to the interdisciplinary efforts of mind,…

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

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.

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

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...

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...

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...

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...

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, ...

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

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

Final report for Verglimit at hole-in-the-wall slide section : experimental feature evaluation.

DOT National Transportation Integrated Search

1989-06-01

In 1983, experimental Verglimit overlays were placed on two Oregon bridges known to have icing problems. The performance of the test overlays, constructed on the Salmon River Bridge in Clackamas County and the Quartz Creek Bridge in Clatsop County, w...

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 ...

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...

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

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...

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...

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.

Level II scour analysis for Bridge 10 (BENNUS00070010) on U.S. Route 7, crossing the Walloomsac River, Bennington, Vermont

USGS Publications Warehouse

Olson, Scott A.; Burns, Ronda L.

1997-01-01

This report provides the results of a detailed Level II analysis of scour potential at structure BENNUS00070010 on U.S. Route 7, also known as North Street, crossing of the Walloomsac River, Bennington, Vermont (figures 1–8). A Level II study is a basic engineering analysis of the site, including a quantitative analysis of stream stability and scour (U.S. Department of Transportation, 1993). Results of a Level I scour investigation also are included in Appendix E of this report. A Level I investigation provides a qualitative geomorphic characterization of the study site. Information on the bridge, gleaned from Vermont Agency of Transportation (VTAOT) files, was compiled prior to conducting Level I and Level II analyses and is found in Appendix D. The site is in the Green Mountain section of the New England physiographic province in southwestern Vermont. The 30.1-mi2 drainage area is a predominantly rural and forested basin. The bridge site is located within an urban setting in the Town of Bennington with buildings, parking lots, lawns, and a playground on the overbank areas. In the study area, the Walloomsac River has a straight channel with constructed channel banks through much of the reach. The channel is located on a delta and has a slope of approximately 0.02 ft/ft, an average channel top width of 37 ft and an average bank height of 5 ft. The predominant channel bed material is cobble with a median grain size (D50) of 96.0 mm (0.315 ft). The geomorphic assessment at the time of the Level I and Level II site visit on August 5, 1996, indicated that the constructed reach was stable. The U.S. Route 7 crossing of the Walloomsac River is a 53-ft-long, two-lane bridge consisting of one 50-foot steel span (Vermont Agency of Transportation, written communication, September 27, 1995). The bridge is supported by vertical, concrete abutments with wingwalls. The wingwalls are angled in toward the channel because the widths of the upstream and downstream constructed channel banks are narrower than the bridge opening. The channel is skewed approximately 5 degrees to the opening and the opening-skew-to-roadway is 10 degrees. Scour countermeasures at the site include masonry and stone walls on both the upstream and downstream banks. Additional details describing conditions at the site are included in the Level II Summary and Appendices D and E. Scour depths and recommended rock rip-rap sizes were computed using the general guidelines described in Hydraulic Engineering Circular 18 (Richardson and others, 1995). Total scour at a highway crossing is comprised of three components: 1) long-term streambed degradation; 2) contraction scour (due to accelerated flow caused by a reduction in flow area at a bridge) and; 3) local scour (caused by accelerated flow around piers and abutments). Total scour is the sum of the three components. Equations are available to compute depths for contraction and local scour and a summary of the results of these computations follows. Contraction scour computed for all modelled flows ranged from 0.0 to 0.1 ft. The worstcase contraction scour occurred at the 500-year discharge. Computed left abutment scour ranged from 5.9 to 6.8 ft. with the worst-case scour occurring at the 500-year discharge. Computed right abutment scour for all modelled flows was 6.8 ft. Total scour depths for all modelled flows did not exceed the depth of the abutment footings. Additional information on scour depths and depths to armoring are included in the section titled “Scour Results”. Scoured-streambed elevations, based on the calculated scour depths, are presented in tables 1 and 2. A cross-section of the scour computed at the bridge is presented in figure 8. Scour depths were calculated assuming an infinite depth of erosive material and a homogeneous particle-size distribution. It is generally accepted that the Froehlich equation (abutment scour) gives “excessively conservative estimates of scour depths” (Richardson and others, 1995, p. 47). Usually, computed scour depths are evaluated in combination with other information including (but not limited to) historical performance during flood events, the geomorphic stability assessment, existing scour protection measures, and the results of the hydraulic analyses. Therefore, scour depths adopted by VTAOT may differ from the computed values documented herein.

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.

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...

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...

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 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...

Photographic copy of circa 1934, 10” x 15”, black and ...

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

Photographic copy of circa 1934, 10” x 15”, black and white aerial photograph. Loose in oversized box located at the National Museum of American History, Smithsonian Institution, Archives Center, Work and Industry Division, Washington, D.C. Original Photographer unknown. AERIAL PHOTOGRAPH OF BRIDGE UNDER CONSTRUCTION LOOKING SOUTH FROM EAST BANK TOWARD WEST BANK SHOWING COMPLETED STEEL RAIL SECTION AND PART OF BRIDGE DECK TRUSS UNDER CONSTRUCTION. - Huey P. Long Bridge, Spanning Mississippi River approximately midway between nine & twelve mile points upstream from & west of New Orleans, Jefferson, Jefferson Parish, LA

Importance of Topographic Features and Tactical Annotations on Maps Used by Army Aviators for Nap-of-the-Earth Flight.

DTIC Science & Technology

1982-01-01

real word but, instead, are sk-bematic diagrams - stylized, simplified, generalized, and codified presentations of a selected sample of some of the...Turntable/ Roundhouse 3.53 3 Drydock 3.44 7 Barn/Shed 3.41 2 Tailings/Slag Dumps 3.34 5 Bridge Construction Type 3.20 24 Road Name/Number 3.18 7 Bridge...Shaft Mine 3.58 Stockyard 3.54 Turntable/ Roundhouse 3.53 Drydock 3.44 Barn/Shed 3.41 j Tailings/Slag Dumps 3.34 Bridge Construction Type 3.20 Road

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.

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...

8. Copyphoto of 1934 aerial photo, view to the east, ...

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

8. Copy-photo of 1934 aerial photo, view to the east, by the U.S. Army Air Corps, showing bridge tender's station and Mud Bayou Railway Bridge under construction - High Island Bridge Tender's Station, State Highway 124 Crossing of Mud Bayou, High Island, Galveston County, TX

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...

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...

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...

Condition assessment and methods of abatement of prestressed concrete box-beam deterioration, phase II : volume 1.

DOT National Transportation Integrated Search

2009-04-13

Side-by-side box-beam bridge constitutes approximately 17 percent of bridges built or replaced annually on : public roads and there is a renewed thrust to use this bridge type for rapid construction under the Highway for : LIFE program. Further, fail...

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...

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...

Condition assessment and methods of abatement of prestressed concrete box-beam deterioration, phase II : volume 2.

DOT National Transportation Integrated Search

2009-04-13

Side-by-side box-beam bridge constitutes approximately 17 percent of bridges built or replaced annually on public roads and there is a renewed thrust to use this bridge type for rapid construction under the Highway for LIFE program. Further, failure ...

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

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

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

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

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

19. Photocopy of Blueprint (Original blueprint located in Grays Harbor ...

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

19. Photocopy of Blueprint (Original blueprint located in Grays Harbor County Bridge File No. 4731/0.5 COAST BRIDGE COMPANY'S CONSTRUCTION BLUEPRINT OF 'FLOOR SYSTEM FOR 120' RIVETED SPAN' DATED JULY 1915 - West Wishkah Bridge, West Wishkah Road Spanning Wishkah River Middle Fork, Aberdeen, Grays Harbor County, WA

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 ...

A bridge between unified cosmic history by f( R)-gravity and BIonic system

NASA Astrophysics Data System (ADS)

Sepehri, Alireza; Capozziello, Salvatore; Setare, Mohammad Reza

2016-04-01

Recently, the cosmological deceleration-acceleration transition redshift in f( R) gravity has been considered in order to address consistently the problem of cosmic evolution. It is possible to show that the deceleration parameter changes sign at a given redshift according to observational data. Furthermore, a f( R) gravity cosmological model can be constructed in brane-antibrane system starting from the very early universe and accounting for the cosmological redshift at all phases of cosmic history, from inflation to late time acceleration. Here we propose a f( R) model where transition redshifts correspond to inflation-deceleration and deceleration-late time acceleration transitions starting froma BIon system. At the point where the universe was born, due to the transition of k black fundamental strings to the BIon configuration, the redshift is approximately infinity and decreases with reducing temperature (z˜ T2). The BIon is a configuration in flat space of a universe-brane and a parallel anti-universe-brane connected by a wormhole. This wormhole is a channel for flowing energy from extra dimensions into our universe, occurring at inflation and decreasing with redshift as z˜ T^{4+1/7}. Dynamics consists with the fact that the wormhole misses its energy and vanishes as soon as inflation ends and deceleration begins. Approaching two universe branes together, a tachyon is originated, it grows up and causes the formation of a wormhole. We show that, in the framework of f( R) gravity, the cosmological redshift depends on the tachyonic potential and has a significant decrease at deceleration-late time acceleration transition point (z˜ T^{2/3}). As soon as today acceleration approaches, the redshift tends to zero and the cosmological model reduces to the standard Λ CDM cosmology.

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.

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 total, the system consisted of 24 accelerometers, 13 Gophers, 10 Roocas, 5 relays, and 1 base station. As it happened, the bridge was subjected to heavy rain, winds, and a typhoon during the experiment allowing the DuraMote to demonstrate extra ordinary robustness and durability. Indeed, in spite of the rough weather, acceleration data was continuously recorded from which natural frequencies, mode shapes, and other structural parameters were calculated. This opportunity would not have happened if the experiment was planned for a shorter duration.

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 :...

Development and Field Testing of a Model to Simulate a Demonstration of Le Chatelier's Principle Using the Wheatstone Bridge Circuit.

ERIC Educational Resources Information Center

Vickner, Edward Henry, Jr.

An electronic simulation model was designed, constructed, and then field tested to determine student opinion of its effectiveness as an instructional aid. The model was designated as the Equilibrium System Simulator (ESS). The model was built on the principle of electrical symmetry applied to the Wheatstone bridge and was constructed from readily…

Government's Construction of the Relation between Parents and Schools in the Upbringing of Children in England: 1963-2009

ERIC Educational Resources Information Center

Bridges, David

2010-01-01

In this essay David Bridges argues that since most families choose to realize their responsibility for the major part of their children's education through state schools, then the way in which the state constructs parents' relation with these schools is one of its primary levers on parenting itself. Bridges then examines the way in which…

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.

Microdevelopment during an activity-based science lesson

NASA Astrophysics Data System (ADS)

Parziale, Jim

1997-11-01

The purpose of this study was to describe the microdevelopment of task-related skills during a classroom science activity. Pairs of fifth and pairs of seventh grade students were videotaped as they constructed marshmallow and toothpick bridges. A skill theory based system of analysis was developed and used to detect the construction of new understandings. Patterns of change observed in these understandings were used to infer three means of self-construction: shifts of focus, bridging mechanisms and distributed cognition. Shift of focus is a mechanism used by students to efficiently explore a web of possibilities, collect ideas and make observations for later coordination as new understandings. Bridging mechanisms are partially built conversational structures that scaffolded the construction of higher level thinking structures. Students used the distributed cognition mechanism to test the adaptiveness of their design ideas without the need to fully coordinate an understandings of these designs. An integrated model of these three mechanisms is proposed specific to this task. This model describes how these mechanisms spontaneously emerged and interacted to support the construction of mental representations.

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.

Load response and gap formation in a single-row cruciate suture rotator cuff repair.

PubMed

Huntington, Lachlan; Richardson, Martin; Sobol, Tony; Caldow, Jonathon; Ackland, David C

2017-06-01

Double-row rotator cuff tendon repair techniques may provide superior contact area and strength compared with single-row repairs, but are associated with higher material expenses and prolonged operating time. The purpose of this study was to evaluate gap formation, ultimate tensile strength and stiffness of a single-row cruciate suture rotator cuff repair construct, and to compare these results with those of the Mason-Allen and SutureBridge repair constructs. Infraspinatus tendons from 24 spring lamb shoulders were harvested and allocated to cruciate suture, Mason-Allen and SutureBridge repair groups. Specimens were loaded cyclically between 10 and 62 N for 200 cycles, and gap formation simultaneously measured using a high-speed digital camera. Specimens were then loaded in uniaxial tension to failure, and construct stiffness and repair strength were evaluated. Gap formation in the cruciate suture repair was significantly lower than that of the Mason-Allen repair (mean difference = 0.6 mm, P = 0.009) and no different from that of the SutureBridge repair (P > 0.05). Both the cruciate suture repair (mean difference = 15.7 N/mm, P = 0.002) and SutureBridge repair (mean difference = 15.8 N/mm, P = 0.034) were significantly stiffer than that of the Mason-Allen repair; however, no significant differences in ultimate tensile strength between repair groups were discerned (P > 0.05). The cruciate suture repair construct, which may represent a simple and cost-effective alternative to double-row and double-row equivalent rotator cuff repairs, has comparable biomechanical strength and integrity with that of the SutureBridge repair, and may result in improved construct longevity and tendon healing compared with the Mason-Allen repair. © 2017 Royal Australasian College of Surgeons.

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...

Bulb-T beams with self-consolidating concrete on the Route 33 bridge over the Pamunkey River in Virginia.

DOT National Transportation Integrated Search

2008-01-01

This study evaluated the bulb-T beams made with self-consolidating concrete (SCC) used in the Route 33 Bridge over the Pamunkey River at West Point, Virginia. Before the construction of the bridge, two test beams with SCC similar in cross section to ...

33 CFR Appendix B to Part 277 - Hypothetical Example of Cost Apportionment

Code of Federal Regulations, 2013 CFR

2013-07-01

...) $165,489 I b. Fixed charges (owner's share) 284,460 II A fixed charge such as engineering, design and... new bridge is designed for increased loading and width greater than that of the old bridge. Therefore, the estimated annual maintenance cost was based on a hypothetical bridge designed, but not constructed...

33 CFR Appendix B to Part 277 - Hypothetical Example of Cost Apportionment

Code of Federal Regulations, 2014 CFR

2014-07-01

...) $165,489 I b. Fixed charges (owner's share) 284,460 II A fixed charge such as engineering, design and... new bridge is designed for increased loading and width greater than that of the old bridge. Therefore, the estimated annual maintenance cost was based on a hypothetical bridge designed, but not constructed...

33 CFR Appendix B to Part 277 - Hypothetical Example of Cost Apportionment

Code of Federal Regulations, 2010 CFR

2010-07-01

...) $165,489 I b. Fixed charges (owner's share) 284,460 II A fixed charge such as engineering, design and... new bridge is designed for increased loading and width greater than that of the old bridge. Therefore, the estimated annual maintenance cost was based on a hypothetical bridge designed, but not constructed...

33 CFR Appendix B to Part 277 - Hypothetical Example of Cost Apportionment

Code of Federal Regulations, 2011 CFR

2011-07-01

...) $165,489 I b. Fixed charges (owner's share) 284,460 II A fixed charge such as engineering, design and... new bridge is designed for increased loading and width greater than that of the old bridge. Therefore, the estimated annual maintenance cost was based on a hypothetical bridge designed, but not constructed...

33 CFR Appendix B to Part 277 - Hypothetical Example of Cost Apportionment

Code of Federal Regulations, 2012 CFR

2012-07-01

...) $165,489 I b. Fixed charges (owner's share) 284,460 II A fixed charge such as engineering, design and... new bridge is designed for increased loading and width greater than that of the old bridge. Therefore, the estimated annual maintenance cost was based on a hypothetical bridge designed, but not constructed...

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

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

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...

Characterizing a Model of Coronal Heating and Solar Wind Acceleration Based on Wave Turbulence.

NASA Astrophysics Data System (ADS)

Downs, C.; Lionello, R.; Mikic, Z.; Linker, J.; Velli, M.

2014-12-01

Understanding the nature of coronal heating and solar wind acceleration is a key goal in solar and heliospheric research. While there have been many theoretical advances in both topics, including suggestions that they may be intimately related, the inherent scale coupling and complexity of these phenomena limits our ability to construct models that test them on a fundamental level for realistic solar conditions. At the same time, there is an ever increasing impetus to improve our spaceweather models, and incorporating treatments for these processes that capture their basic features while remaining tractable is an important goal. With this in mind, I will give an overview of our exploration of a wave-turbulence driven (WTD) model for coronal heating and solar wind acceleration based on low-frequency Alfvénic turbulence. Here we attempt to bridge the gap between theory and practical modeling by exploring this model in 1D HD and multi-dimensional MHD contexts. The key questions that we explore are: What properties must the model possess to be a viable model for coronal heating? What is the influence of the magnetic field topology (open, closed, rapidly expanding)? And can we simultaneously capture coronal heating and solar wind acceleration with such a quasi-steady formulation? Our initial results suggest that a WTD based formulation performs adequately for a variety of solar and heliospheric conditions, while significantly reducing the number of free parameters when compared to empirical heating and solar wind models. The challenges, applications, and future prospects of this type of approach will also be discussed.

Development and application of compact and on-chip electron linear accelerators for dynamic tracking cancer therapy and DNA damage/repair analysis

NASA Astrophysics Data System (ADS)

Uesaka, M.; Demachi, K.; Fujiwara, T.; Dobashi, K.; Fujisawa, H.; Chhatkuli, R. B.; Tsuda, A.; Tanaka, S.; Matsumura, Y.; Otsuki, S.; Kusano, J.; Yamamoto, M.; Nakamura, N.; Tanabe, E.; Koyama, K.; Yoshida, M.; Fujimori, R.; Yasui, A.

2015-06-01

We are developing compact electron linear accelerators (hereafter linac) with high RF (Radio Frequency) frequency (9.3 GHz, wavelength 32.3 mm) of X-band and applying to medicine and non-destructive testing. Especially, potable 950 keV and 3.95 MeV linac X-ray sources have been developed for on-site transmission testing at several industrial plants and civil infrastructures including bridges. 6 MeV linac have been made for pinpoint X-ray dynamic tracking cancer therapy. The length of the accelerating tube is ∼600 mm. The electron beam size at the X-ray target is less than 1 mm and X-ray spot size at the cancer is less than 3 mm. Several hardware and software are under construction for dynamic tracking therapy for moving lung cancer. Moreover, as an ultimate compact linac, we are designing and manufacturing a laser dielectric linac of ∼1 MeV with Yr fiber laser (283 THz, wavelength 1.06 pm). Since the wavelength is 1.06 μm, the length of one accelerating strcture is tens pm and the electron beam size is in sub-micro meter. Since the sizes of cell and nuclear are about 10 and 1 μm, respectively, we plan to use this “On-chip” linac for radiation-induced DNA damage/repair analysis. We are thinking a system where DNA in a nucleus of cell is hit by ∼1 μm electron or X-ray beam and observe its repair by proteins and enzymes in live cells in-situ.

7. Historic American Buildings Survey W. N. Manning, Photographer, January ...

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

7. Historic American Buildings Survey W. N. Manning, Photographer, January 5, 1935 VIEW SHOWING INNER CONSTRUCTION OF BRIDGE - Covered Bridge, Spanning Choccolocco Creek , Old Eastaboga, Talladega County, AL

2. Historic American Buildings Survey W. N. Manning, Photographer, January ...

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

2. Historic American Buildings Survey W. N. Manning, Photographer, January 5, 1935 VIEW SHOWING UNDER CONSTRUCTION OF BRIDGE - Covered Bridge, Spanning Choccolocco Creek , Old Eastaboga, Talladega County, AL

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.

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) ...

Triadic (ecological, neural, cognitive) niche construction: a scenario of human brain evolution extrapolating tool use and language from the control of reaching actions

PubMed Central

Iriki, Atsushi; Taoka, Miki

2012-01-01

Hominin evolution has involved a continuous process of addition of new kinds of cognitive capacity, including those relating to manufacture and use of tools and to the establishment of linguistic faculties. The dramatic expansion of the brain that accompanied additions of new functional areas would have supported such continuous evolution. Extended brain functions would have driven rapid and drastic changes in the hominin ecological niche, which in turn demanded further brain resources to adapt to it. In this way, humans have constructed a novel niche in each of the ecological, cognitive and neural domains, whose interactions accelerated their individual evolution through a process of triadic niche construction. Human higher cognitive activity can therefore be viewed holistically as one component in a terrestrial ecosystem. The brain's functional characteristics seem to play a key role in this triadic interaction. We advance a speculative argument about the origins of its neurobiological mechanisms, as an extension (with wider scope) of the evolutionary principles of adaptive function in the animal nervous system. The brain mechanisms that subserve tool use may bridge the gap between gesture and language—the site of such integration seems to be the parietal and extending opercular cortices. PMID:22106423

Triadic (ecological, neural, cognitive) niche construction: a scenario of human brain evolution extrapolating tool use and language from the control of reaching actions.

PubMed

Iriki, Atsushi; Taoka, Miki

2012-01-12

Hominin evolution has involved a continuous process of addition of new kinds of cognitive capacity, including those relating to manufacture and use of tools and to the establishment of linguistic faculties. The dramatic expansion of the brain that accompanied additions of new functional areas would have supported such continuous evolution. Extended brain functions would have driven rapid and drastic changes in the hominin ecological niche, which in turn demanded further brain resources to adapt to it. In this way, humans have constructed a novel niche in each of the ecological, cognitive and neural domains, whose interactions accelerated their individual evolution through a process of triadic niche construction. Human higher cognitive activity can therefore be viewed holistically as one component in a terrestrial ecosystem. The brain's functional characteristics seem to play a key role in this triadic interaction. We advance a speculative argument about the origins of its neurobiological mechanisms, as an extension (with wider scope) of the evolutionary principles of adaptive function in the animal nervous system. The brain mechanisms that subserve tool use may bridge the gap between gesture and language--the site of such integration seems to be the parietal and extending opercular cortices.

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

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...

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...

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...

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 ...

23 CFR 630.803 - Procedures.

Code of Federal Regulations, 2010 CFR

2010-04-01

... PROCEDURES Bridges on Federal Dams § 630.803 Procedures. A State's application to qualify a project under... part of the agency constructing the dam to provide such bridge or approach roads to satisfy a legal...

23 CFR 630.803 - Procedures.

Code of Federal Regulations, 2011 CFR

2011-04-01

... PROCEDURES Bridges on Federal Dams § 630.803 Procedures. A State's application to qualify a project under... part of the agency constructing the dam to provide such bridge or approach roads to satisfy a legal...

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...

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...

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...

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....

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.

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.

Validating the use of smartphone-based accelerometers for performance assessment in a simulated neurosurgical task.

PubMed

Jensen Ang, Wei Jie; Hopkins, Michael Edward; Partridge, Roland; Hennessey, Iain; Brennan, Paul Martin; Fouyas, Ioannis; Hughes, Mark Antony

2014-03-01

Reductions in working hours affect training opportunities for surgeons. Surgical simulation is increasingly proposed to help bridge the resultant training gap. For simulation training to translate effectively into the operating theater, acquisition of technical proficiency must be objectively assessed. Evaluating "economy of movement" is one way to achieve this. We sought to validate a practical and economical method of assessing economy of movement during a simulated task. We hypothesized that accelerometers, found in smartphones, provide quantitative, objective feedback when attached to a neurosurgeon's wrists. Subjects (n = 25) included consultants, senior registrars, junior registrars, junior doctors, and medical students. Total resultant acceleration (TRA), average resultant acceleration, and movements with acceleration >0.6g (suprathreshold acceleration events) were recorded while subjects performed a simulated dural closure task. Students recorded an average TRA 97.0 ± 31.2 ms higher than senior registrars (P = .03) and 103 ± 31.2 ms higher than consultants (P = .02). Similarly, junior doctors accrued an average TRA 181 ± 31.2 ms higher than senior registrars (P < .001) and 187 ± 31.2 ms higher than consultants (P < .001). Significant correlations were observed between surgical outcome (as measured by quality of dural closure) and both TRA (r = .44, P < .001) and number of suprathreshold acceleration events (r = .33, P < .001). TRA (219 ± 66.6 ms; P = .01) and number of suprathreshold acceleration events (127 ± 42.5; P = .02) dropped between the first and fourth trials for junior doctors, suggesting procedural learning. TRA was 45.4 ± 17.1 ms higher in the dominant hand for students (P = .04) and 57.2 ± 17.1 ms for junior doctors (P = .005), contrasting with even TRA distribution between hands (acquired ambidexterity) in senior groups. Data from smartphone-based accelerometers show construct validity as an adjunct for assessing technical performance during simulation training.

Development of a High Precision Displacement Measurement System by Fusing a Low Cost RTK-GPS Sensor and a Force Feedback Accelerometer for Infrastructure Monitoring.

PubMed

Koo, Gunhee; Kim, Kiyoung; Chung, Jun Yeon; Choi, Jaemook; Kwon, Nam-Yeol; Kang, Doo-Young; Sohn, Hoon

2017-11-28

A displacement measurement system fusing a low cost real-time kinematic global positioning system (RTK-GPS) receiver and a force feedback accelerometer is proposed for infrastructure monitoring. The proposed system is composed of a sensor module, a base module and a computation module. The sensor module consists of a RTK-GPS rover and a force feedback accelerometer, and is installed on a target structure like conventional RTK-GPS sensors. The base module is placed on a rigid ground away from the target structure similar to conventional RTK-GPS bases, and transmits observation messages to the sensor module. Then, the initial acceleration, velocity and displacement responses measured by the sensor module are transmitted to the computation module located at a central monitoring facility. Finally, high precision and high sampling rate displacement, velocity, and acceleration are estimated by fusing the acceleration from the accelerometer, the velocity from the GPS rover, and the displacement from RTK-GPS. Note that the proposed displacement measurement system can measure 3-axis acceleration, velocity as well as displacement in real time. In terms of displacement, the proposed measurement system can estimate dynamic and pseudo-static displacement with a root-mean-square error of 2 mm and a sampling rate of up to 100 Hz. The performance of the proposed system is validated under sinusoidal, random and steady-state vibrations. Field tests were performed on the Yeongjong Grand Bridge and Yi Sun-sin Bridge in Korea, and the Xihoumen Bridge in China to compare the performance of the proposed system with a commercial RTK-GPS sensor and other data fusion techniques.

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...

12. VIEW, LOOKING NORTH, SHOWING CABLEWAY AND TRAM ABOVE AN ...

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

12. VIEW, LOOKING NORTH, SHOWING CABLEWAY AND TRAM ABOVE AN ARCH UNDER CONSTRUCTION, WITH RAILROAD BRIDGE IN BACKGROUND - Cotter Bridge, Spanning White River at U.S. Highway 62, Cotter, Baxter County, AR

Field study of integral backwall with elastic inclusion.

DOT National Transportation Integrated Search

2005-01-01

Jointless construction is considered an effective design option to reduce bridge maintenance costs and resist seismic loads. Although these attributes make the integral bridge an increasingly popular choice, soil-structure interaction issues unique t...

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...

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...

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...

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...

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.

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.

Corrosion Propagation of Rebar Embedded in High Performance Concrete

NASA Astrophysics Data System (ADS)

Nazim, Manzurul

The FDOT has been using supplementary cementitious materials while constructing steel reinforced concrete marine bridge structures for over 3 decades. Previous findings indicated that such additions in concrete mix make the concrete more durable. To better understand corrosion propagation of rebar in high performance concrete: mature concrete samples that were made (2008/2009) with Portland cement, a binary mix, a ternary mix and recently prepared (April 2016 with 50% OPC + 50% slag and 80% OPC + 20% Fly ash) concrete samples were considered. None of these concretes had any admixed chloride to start with. An accelerated chloride transport process was used to drive chloride ions into the concrete so that chlorides reach and exceed the chloride threshold at the rebar surface and initiate corrosion. Electrochemical measurements were taken at regular intervals (during and after the electro-migration process) to observe the corrosion propagation in each sample.

Autoregressive statistical pattern recognition algorithms for damage detection in civil structures

NASA Astrophysics Data System (ADS)

Yao, Ruigen; Pakzad, Shamim N.

2012-08-01

Statistical pattern recognition has recently emerged as a promising set of complementary methods to system identification for automatic structural damage assessment. Its essence is to use well-known concepts in statistics for boundary definition of different pattern classes, such as those for damaged and undamaged structures. In this paper, several statistical pattern recognition algorithms using autoregressive models, including statistical control charts and hypothesis testing, are reviewed as potentially competitive damage detection techniques. To enhance the performance of statistical methods, new feature extraction techniques using model spectra and residual autocorrelation, together with resampling-based threshold construction methods, are proposed. Subsequently, simulated acceleration data from a multi degree-of-freedom system is generated to test and compare the efficiency of the existing and proposed algorithms. Data from laboratory experiments conducted on a truss and a large-scale bridge slab model are then used to further validate the damage detection methods and demonstrate the superior performance of proposed algorithms.

Development of a six-year research needs assessment for timber transportation structures

Treesearch

Terry J. Wipf; Michael A. Ritter; Sheila Rimal Duwadi; Russell C. Moody

1993-01-01

A timber bridge, once a thing of the past, is now becoming a thing of the present. Interest in timber bridges and other transportation structures has been rapidly increasing. Much of this is due to new technologies in design and construction as well as advances in material manufacturing and presevative treatments. Although timber bridges and other transportation...

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...

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…

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...

Implementation program on high performance concrete: guidelines for instrumentation on bridges

DOT National Transportation Integrated Search

1996-08-01

This report provides an outline for the instrumentation of bridges being constructed under the Federal Highway Administration's (FHWA's) Strategic Highway Research Program (SHRP) implementation effort in High Performance Concrete (HPC). The report de...

Impact of overhang construction on girder design.

DOT National Transportation Integrated Search

2010-05-01

Economical constraints on the design of bridges usually necessitate the use of as few girders as possible across the : bridge width. The girders are typically uniformly spaced transversely with the deck extending past the fascia girders, thereby : re...

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...

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...

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...

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...

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...

Geospatial wetlands impacts and mitigation forecasting models.

DOT National Transportation Integrated Search

2017-06-30

The South Carolina Department of Transportation (SCDOT) develops near (3-5 years) and long (15- 20 years) range plans for road widening, alignment, bridge replacement, and new road construction. Each road/bridge project may impact wetlands or streams...

Application of Classical Land Surveying Measurement Methods for Determining the Vertical Displacement of Railway Bridges

NASA Astrophysics Data System (ADS)

Gawronek, Pelagia; Makuch, Maria

2017-12-01

The classical measurements of stability of railway bridge, in the context of determining the vertical displacements of the object, consisted on precise leveling of girders and trigonometric leveling of controlled points (fixed into girders' surface). The construction elements, which were measured in two ways, in real terms belonged to the same vertical planes. Altitude measurements of construction were carried out during periodic structural stability tests and during static load tests of bridge by train. The specificity of displacement measurements, the type of measured object and the rail land surveying measurement conditions were determinants to define methodology of altitude measurement. The article presents compatibility of vertical displacements of steel railway bridge, which were developed in two measurement methods. In conclusion, the authors proposed the optimum concept of determining the vertical displacements of girders by using precise and trigonometric leveling (in terms of accuracy, safety and economy of measurement).

Evaluation of continuity detail for precast prestressed girders.

DOT National Transportation Integrated Search

2011-08-01

The construction of highway bridges using precast prestressed concrete (PSC) girders is considered one of the most : economical construction alternatives because of the advantages they offer (e.g. reducing formwork and rapid construction). : Construc...

Temporary implant-supported prosthesis for immediate loading according to a chair-side concept: technical note and results from 37 consecutive cases.

PubMed

Ostman, Pär-Olov; Hellman, Mats; Sennerby, Lars; Wennerberg, Ann

2008-05-01

During the last years, focus has been paid to implant treatment using immediate function protocols, and different approaches to provide patients with temporary constructions have been presented. Most of these techniques involve dental technicians producing the temporary construction, for example, rebuilding existing dentures, acrylic bridges, etc. The purpose of this prospective clinical study was to evaluate the clinical outcome of a chair-side technique of a cost-effective temporary prosthesis. Fixture survival rate and risk of temporary bridge failure were analyzed. Thirty-seven partially or totally edentate patients (18 female and 19 male; mean age: 66.7 years) treated with chair-side manufactured temporary restorations (QuickBridge, BIOMET 3i, Palm Beach, Fl, USA) for immediate loading have been evaluated. The prostheses extended from two unit bridges supported by two implants to full-arch construction supported by six implants. The temporary prostheses were monitored from the day of surgery and delivery to the time of replacement with a permanent prosthetic construction 3 to 6 months later. No implants were lost during the observation time. One (3%) temporary prosthesis fractured and additional two (6%) loosened during the follow-up time. The study indicated that the tested chair-side concept for manufacturing of temporary prosthesis for immediate loading of dental implants is a viable approach.