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1

Research on tensile strength characteristics of bridge deck pavement bonding layers  

NASA Astrophysics Data System (ADS)

As the development of the traffic in the world, the bridge deck pavement is playing a more and more important role in the whole traffic system. Big span bridge has become more and more especially cement concrete bridge, therefore the bridge deck pavement bonding layers are emphasized as an important part of bridge traffic system, which can mitigate travel impact to bridge and magnify stationary or traffic amenity. The quality and durability of deck pavement bonding layer has directly effect on traffic safety, comfort, durability and investment of bridge. It represents the first line of defence against the ingress of water, road de-icing salts and aggressive chemicals. In real project, many early age damage of bridge deck pavement has become serious disease that affecting the function of bridge. During the construction of the bridge deck, many types of asphalt binders were used, such as styrene-butadiene-styrene (SBS) modified asphalt, styrene-butadiene rubber (SBR) modified asphalt, neoprene latex asphalt, etc. In this paper UTM-25 was used to test the tensile strength of different bridge deck pavement bonding layers with the different treatment methods to inter-surface.

Wu, Shaopeng; Han, Jun

2009-12-01

2

Research on tensile strength characteristics of bridge deck pavement bonding layers  

NASA Astrophysics Data System (ADS)

As the development of the traffic in the world, the bridge deck pavement is playing a more and more important role in the whole traffic system. Big span bridge has become more and more especially cement concrete bridge, therefore the bridge deck pavement bonding layers are emphasized as an important part of bridge traffic system, which can mitigate travel impact to bridge and magnify stationary or traffic amenity. The quality and durability of deck pavement bonding layer has directly effect on traffic safety, comfort, durability and investment of bridge. It represents the first line of defence against the ingress of water, road de-icing salts and aggressive chemicals. In real project, many early age damage of bridge deck pavement has become serious disease that affecting the function of bridge. During the construction of the bridge deck, many types of asphalt binders were used, such as styrene-butadiene-styrene (SBS) modified asphalt, styrene-butadiene rubber (SBR) modified asphalt, neoprene latex asphalt, etc. In this paper UTM-25 was used to test the tensile strength of different bridge deck pavement bonding layers with the different treatment methods to inter-surface.

Wu, Shaopeng; Han, Jun

2010-03-01

3

Plans: Poop Deck, Boat Deck, Housetop, Bridge Deck, Upper Bridge ...  

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

Plans: Poop Deck, Boat Deck, Housetop, Bridge Deck, Upper Bridge Deck, Navigating Bridge, Forecastle Deck, Upper Deck, Second Deck and Hold - Saugatuck, James River Reserve Fleet, Newport News, Newport News, VA

4

Rapid bridge deck replacement  

E-print Network

replacement time as well as traffic interference. An experimental study consisting of static load tests on a 1/3 scale model of a 60-ft-long steel I-girder bridge with precast concrete panels connected with epoxy mortar and shear connectors to accomplish... bridge structures. These methods essentially involve use of epoxy mortar and standard welded shear connectors. The overall method appears to be viable and econom1cal. However, several serious questions, especially regarding structural behav1 or...

Osegueda, Roberto Alejandro

2012-06-07

5

Strategic sensor locations of FPR bridge decks  

NASA Astrophysics Data System (ADS)

Advanced fiber-reinforced polymer composite (FRP) has been increasingly used in bridge deck to replace concrete or steel. A FRP bridge deck can be designed to meet AASHTO HS-25 load requirements. FRP decks have many advantages over the conventional reinforced concrete or steel decks owing to their lightweight, high strength and corrosion resistance. However, such new deck system requires extensive monitoring to ensure its designed performance before its widespread acceptance by the bridge community. For inspection and evaluation purpose, a proper monitoring system consisting of various kinds of sensors installed in the FRP deck is critical. This paper provides a framework for designing an efficient monitoring system. The strategic sensor locations are identified based on the stress analysis of the FRP deck.

Wu, Hwai-Chung; Warnemuende, Kraig; Yan, An; Mu, Bin

2003-07-01

6

Dog Bridge, view of the deck of the bridge and ...  

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

Dog Bridge, view of the deck of the bridge and rails looking from Linden Lane - National Park Seminary, Bounded by Capitol Beltway (I-495), Linden Lane, Woodstove Avenue, & Smith Drive, Silver Spring, Montgomery County, MD

7

Bridge deck designs for railing impacts  

E-print Network

BRIDGE DECK DESIGNS FOR RAILING IMPACTS A Thesis by ALTHEA GAYLE ARNOLD Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1984 Major Subject: Civil... Engineering BRIDGE DECK DESIGNS FOR RAILING IMPACTS A Thesis by ALTHEA GAYLE ARNOLD Approved as to style and content by: Hirsc (Ch rman of Committee) But (Member) son (Member) op nger (Member) &r c (Head of Department) May 1984 ABSTRACT...

Arnold, Althea Gayle

1984-01-01

8

Fabrication procedure effects on fatigue resistance of rib -to-deck welded joints of steel orthotropic bridge decks.  

E-print Network

??Orthotropic steel bridge decks have been widely used for long- and medium-span bridges due to excellent structural characteristics. However, orthotropic decks have experienced various fatigue… (more)

Sim, Hyoung-Bo

2010-01-01

9

Embedded fiber optic sensors for bridge deck chloride penetration measurements  

NASA Astrophysics Data System (ADS)

The use of chloride-based deicing agents to help clear U.S. highways of roadway hazards leads to associated chemical related problems. Fouling of local rivers and streams due to runoff of the waterborne chlorides is significant and has contributed to local ordinances that are attempting to force state agencies to reduce, if not eliminate, the use of these chlorides (typically at the cost of increased driving hazards). With respect to the corrosion aspects of chloride application, cracks that occur in the roadway/bridge pavement allow water to seep into the pavement carrying the chloride to the rebar with the resultant increase in corrosion. The costs of this corrosion are considerable and have led to the wide- spread use of chloride/water impermeable membranes on roadways and especially within bridges. Fiber optics sensors have repeatedly been shown to provide measurement capabilities of parameters within such reinforced concrete structures. Development of fiber optic chloride sensors capable of being embedded within a roadway or bridge deck is reported.

Fuhr, Peter L.; Huston, Dryver R.; MacCraith, Brian D.

1998-04-01

10

DEVELOPMENT OF FRP BRIDGE DECKS AN ANALYTICAL INVESTIGATION -  

E-print Network

results. Finite Element Analysis (FEA) was used to get a detailed behavior of the these bridge decks are combined with pultruded glass fiber bars and plates to create a single deck module. The ANSYS Finite

11

Subsurface Defect Detection in FRP Bridge Decks Using Ground Penetrating Radar  

NASA Astrophysics Data System (ADS)

While Ground Penetrating Radar (GPR) has been widely used for defect detection in concrete bridge decks and pavements, its use has not been explored for Fiber Reinforced Polymer (FRP) bridge decks. This paper presents the results from an experimental study that investigated the use of GPR for subsurface defect detection in FRP bridge decks. Several FRP bridge deck specimens were cast with embedded subsurface defects (air- and water-filled) of varying planar sizes and thicknesses. These decks were then tested using a GPR system with 2.0 GHz air-launched and 1.5 GHz ground-coupled antennas. Results from both antennas have been compared. Both antennas had problems in detecting air-filled defects but could detect water-filled defects. Moreover, it was found that because of its closer proximity (ground-coupling) and higher energy input into the bridge deck, the ground-coupled antenna could detect smaller defect sizes (water-filled) much better compared to the air-launched antenna.

Halabe, Udaya B.; Hing, Cheng L.; Klinkhachorn, Powsiri; GangaRao, Hota V. S.

2007-03-01

12

6. VIEW LOOKING WEST FROM BRIDGE DECK, SHOWING TOP LATERAL ...  

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

6. VIEW LOOKING WEST FROM BRIDGE DECK, SHOWING TOP LATERAL BRACING, MAIN TIE AND COUNTERS, SWAY STRUTS AND BRACING, AND INTERMEDIATE POSTS - Hart County Bridge, State Route 181, spanning Savannah River, Hartwell, Hart County, GA

13

10. AN IMAGE, LOOKING DUE NORTH OF THE BRIDGE DECK, ...  

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

10. AN IMAGE, LOOKING DUE NORTH OF THE BRIDGE DECK, SHOWING LAYERS OF GRAVEL, ASPHALT AND TIMBER. - Wells County Bridge No. 74, Spanning Rock Creek Ditch at County Road 400, Bluffton, Wells County, IN

14

8. Detail of underside of bridge deck, from the southern ...  

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

8. Detail of underside of bridge deck, from the southern end looking toward north-northwest. - Bridge No. 4800, Spanning Minnesota River on Trunk Highway 4 between Brown & Nicollet Counties, Sleepy Eye, Brown County, MN

15

DETAIL VIEW OF SINGLE PANEL POINTS TAKEN FROM BRIDGE DECK, ...  

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

DETAIL VIEW OF SINGLE PANEL POINTS TAKEN FROM BRIDGE DECK, SHOWING CONNECTION BETWEEN VERTICAL AND UPPER CHORD MEMBER - White Bowstring Arch Truss Bridge, Spanning Yellow Creek at Cemetery Drive (Riverside Drive), Poland, Mahoning County, OH

16

Behavior of Three-Dimensionally Woven Glass Fiber Reinforced Polymeric Bridge Deck  

E-print Network

a lightweight, corrosion resistant alternative to steel and concrete bridge deck. GFRP decks are espe- cially polymer (GFRP) bridge decks have been considered os an alternative to conventional steel and concrete bridge deck and GFRP- concrete hybrid deck. The fundamental material characteristics of the 3-D woven

17

Perspective view of 125' Warren deck trusses of Bridge No. ...  

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

Perspective view of 125' Warren deck trusses of Bridge No. 1413, Sixth Potomac Crossing, looking north from Maryland shore. - Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

18

11. CLOSEUP VIEW OF NORTHEAST SIDE OF BRIDGE DECK SHOWING ...  

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

11. CLOSE-UP VIEW OF NORTHEAST SIDE OF BRIDGE DECK SHOWING TOP OF PIER, EXPANSION JOINT IN CURB AND ATTACHED TELEPHONE CABLE, LOOKING SOUTHWEST - Escalante River Bridge, Spanning Escalante River at State Route 12, 9.5 miles East of Escalante, Escalante, Garfield County, UT

19

144. Camp Creek Bridge. View of the road deck showing ...  

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

144. Camp Creek Bridge. View of the road deck showing the stone-faced guard rails and the grass shoulders continuing across the bridge. Looking east-southeast. - Blue Ridge Parkway, Between Shenandoah National Park & Great Smoky Mountains, Asheville, Buncombe County, NC

20

EARTHQUAKE PERFORMANCE OF A BRIDGE DECK AND ABUTMENT.  

USGS Publications Warehouse

During the 24 April 1984 Morgan Hill Earthquake (M equals 6. 1), 15 channels of acceleration records were obtained at the site of the I-280-680/US 101 interchange 12 km west of the epicenter. These records include free field measurements as well as the acceleration response at one of the supporting column bases, and at three locations in one of the spans of the three-span continuous post-tensioned box-girder deck. The purpose of this paper is to review the performance of this bridge deck and its abutment through the study of these records. The objective in extensively instrumenting a bridge deck or any structure is to obtain relevant response data to study its behaviour during strong motion events and ultimately extrapolate conclusions for improved design.

Celebi, M.; Brady, G.

1985-01-01

21

Western deck plate girder span of Bridge No. 1413, Sixth ...  

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

Western deck plate girder span of Bridge No. 1413, Sixth Potomac Crossing, passing over MD 51, with "WESTERN MARYLAND RAILWAY" painted on the girder panels, looking northwest. - Western Maryland Railway, Cumberland Extension, Pearre to North Branch, from WM milepost 125 to 160, Pearre, Washington County, MD

22

MULTIPLE SENSOR PERIODIC NONDESTRUCTIVE EVALUATION OF A CONCRETE BRIDGE DECK  

E-print Network

MULTIPLE SENSOR PERIODIC NONDESTRUCTIVE EVALUATION OF A CONCRETE BRIDGE DECK J. Cui1 , D.R. Huston2 results of periodically multiple sensor nondestructive testing of a reinforced concrete slab experiment. In the last few decades, a variety of nondestructive evaluation techniques and methods emerged

Huston, Dryver R.

23

Deterioration modeling and rehabilitation decision analysis for assessing the performance of bridge deck expansion joints  

Microsoft Academic Search

Bridge deck expansion joints play an important role in the functioning of bridge structures. They provide room for bridge decks to expand and provide seals to prevent water and debris from penetrating the bridge substructure. When they fail to function properly, the performance of bridges can be seriously affected. In the past two decades a great deal of research has

Yao-Jong Lee

2002-01-01

24

Development of Aluminum Bridge Deck System with Reynolds Metals Company  

SciTech Connect

Currently, there are many structurally-deficient and obsolete bridges in the US highway system. The expected cost for repair and replacement is enormous; therefore, more cost-effective materials and construction methodology must be sought. Reynolds Metals Company formed a vertical consortium to develop and market a cost-effective, innovative, lightweight, corrosion resistant aluminum bridge deck system based on hollow aluminum shapes that could be welded together in the shop to form deck panels. Panels would be shipped to the construction sites for final assembly, which uses connections along longitudinal edges. These deck panels would replace conventional steel or concrete panels. An epoxy-gravel wearing surface would be applied to the top side of the deck to provide a durable, skid-resistant surface. However, before this deck system could be widely utilized, the overall structural integrity had to be fully demonstrated. Reynolds Metals Company and Oak Ridge National Laboratory (ORN L) entered in a Cooperative Research and Development Agreement (CRADA) to conduct a number of fundamental investigations into potentially critical technical areas over approximately a four-year period.

Brinkman, C.R.; Hayden, W.H.

1999-04-01

25

Structural behavior of FRP sandwich panels for bridge decks  

Microsoft Academic Search

This paper presents the analytical and experimental investigations performed to evaluate the structural behavior of Fiber-Reinforced\\u000a Polymer (FRP) Honeycomb Sandwich Panels (HCSPs) used for bridge decks. The analytical investigation includes modeling FRP\\u000a HCSPs using three Finite Element Models (FEM) and a simplified I-beam model. Comparing analysis results of the four models\\u000a against experimental data from literature indicated that the simplified

George Morcous; Yong Cho; Adel El-Safty; Genmiao Chen

2010-01-01

26

Surfacing of concrete bridges  

Microsoft Academic Search

The estimated life for concrete bridges in Denmark is 100 years. One condition to en- sure this long lifetime is waterproofing of the bridge deck together with a high quality asphalt pavement. The surfacing of the concrete bridge deck is important because the concrete should be protected against water and de-icing salts since these factors can lead to reduction of

Vibeke Wegan

27

Vertical impedance measurements on concrete bridge decks for assessing susceptibility of reinforcing steel to corrosion.  

PubMed

Corrosion is a pressing problem for aging concrete infrastructure, especially bridge decks. Because of its sensitivity to factors that affect corrosion of reinforcing steel in concrete, resistivity is an important structural health indicator for reinforced concrete structures. In this research, an instrument was developed to measure vertical impedance on concrete bridge decks. Measurements of vertical impedance on slabs prepared in the laboratory, on slabs removed from decommissioned bridge decks, and on an in-service bridge deck in the field demonstrate the utility of the new apparatus. PMID:22938329

Bartholomew, Paul D; Guthrie, W Spencer; Mazzeo, Brian A

2012-08-01

28

Liu, Rees and Spitler. 1 Simulation of a Geothermal Bridge Deck Anti-icing System and Experimental Validation  

E-print Network

of salt/sand to bridge decks is less successful than application to the adjacent highway due to increased corrosion rates induced by the application of salt. The heating of bridge decks has been proposed improved road safety and increased bridge deck life. A number of heat sources have been proposed

29

Fatigue Life of Damaged Bridge Deck Panels Strengthened With Carbon Fiber Hongseob Oh, Jongsung Sim, and Christian Meyer  

E-print Network

1 Fatigue Life of Damaged Bridge Deck Panels Strengthened With Carbon Fiber Sheets Hongseob Oh was applied to test panels, which were then reinforced with carbon fiber sheets (CFS) using two different for bridge decks, based on cumulative damage theory. Keywords: bridge deck slab, carbon fiber sheets, fatigue

Meyer, Christian

30

DESIGN GUIDELINES FOR BRIDGE DECK SLABS REINFORCED by CFRP and GFRP  

E-print Network

-linear finite element analysis, this paper presents design recommendations for bridge deck slabs reinforced, Canada. #12;2 A non-linear finite element model was performed to predict the behaviour of the deck slabs Hassan 1, Amr Abdelrahman 2, Gamil Tadros 3, and Sami Rizkalla 4 Summary The use of carbon and glass

31

Data Fusion Techniques of Multiple Sensors Nondestructive Evaluation of a Concrete Bridge Deck  

E-print Network

Data Fusion Techniques of Multiple Sensors Nondestructive Evaluation of a Concrete Bridge Deck J decades, nondestructive evaluation (NDE) methods have been applied widely and significantly on concrete of reinforced steel rebars, cracks, voids, etc. Various commercial nondestructive evaluation techniques

Huston, Dryver R.

32

Crack mitigation in concrete bridge decks through experimental analysis and computer modeling  

NASA Astrophysics Data System (ADS)

Bridge deck cracking can cause deterioration of bridge decks, leading to a shorter life span and poor performance. Throughout the US, cracking has been identified as a problem, with transverse cracking along the deck at regular spacings being the most prominent type. This problem is usually caused by drying shrinkage within the concrete. The material properties, restraint, and distances without expansion joints all affect the crack pattern within the deck. This study will delve into the reasons that bridge decks crack, the strains that are associated with drying shrinkage, and possible methods for abating its effects. The research is divided into two parts, the first being laboratory experimentation, which was conducted through the use of two 7 ft. x 10 ft. experimental concrete bridge bays. Each bay was instrumented with strain and temperature gages throughout the deck and girders, which collected data for six months. The first deck was poured with a control concrete mix used currently in Illinois. The second deck was poured with a type K expansive concrete, which could battle the effects of shrinkage. For both decks, the results suggest a compressive strain throughout the rebar and along the top surface of the concrete, except for the locations where cracks are found (at these locations the strain slopes upward into tension). The strain in the type K deck, though, was notably less than that in the control deck and the onset of cracking was delayed by three weeks, giving the indication of an improvement over the current mix design. The second portion of the research was focused on using a finite element model to replicate the bridge bay and study the results. Equivalent temperature loading was used to apply the shrinkage loads recorded during the experimental portion of the research. The model was then expanded to encompass a full-scale bridge and in order to provide some insight into shrinkage strain in the real world. The end goal is to help alleviate cracking in current bridge decks, as well as create suggestions for future bridge construction.

Richardson, Douglas M.

33

Structural Performance of a Full-Depth Precast Concrete Bridge Deck System  

E-print Network

. Adequate strength and stiffness of the proposed full-depth panels deem the design safe for implementation for the Rock Creek Bridge in Fort Worth, Texas. New failure theories are derived for interior and exterior bridge deck spans as present code...

Mander, Thomas

2010-10-12

34

Double-Layer Prefabricated FRP Grids for Rapid Bridge Deck Construction: Case Study  

E-print Network

Double-Layer Prefabricated FRP Grids for Rapid Bridge Deck Construction: Case Study Lawrence C ; Bruce Nelson6 ; and Dennis McMonigal7 Abstract: This paper presents a case study of prefabricated double-layer bridges. The feasibility of modifying manufacturing techniques to create innovative double-layer, 3D

Russell, Jeffrey S.

35

12. ANNISQUAM BRIDGE, LOOKING WEST ALONG DECK, C.1885. Photocopy of ...  

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

12. ANNISQUAM BRIDGE, LOOKING WEST ALONG DECK, C.1885. Photocopy of photograph (original glass plate negative #T14 in the collection of the Annisquam Historical Society, Annisquam, Massachusetts). Photographer: Martha Harvey (1862-1949). - Annisquam Bridge, Spanning Lobster Cove between Washington & River Streets, Gloucester, Essex County, MA

36

Bridge Prioritization for Installation of Automatic Anti-icing Systems in Nebraska  

Microsoft Academic Search

During severe winter conditions bridges freeze before the surrounding roadways, often catching unsuspecting drivers off guard. Depending on weather and pavement conditions, automatic bridge deck anti-icing systems spray chemicals that prevent or minimize ice bonding to the pavement. The Nebraska Department of Roads (NDOR) is interested in installing such systems on various bridges statewide. However, the presence of 2,193 bridges

Aemal Khattak; Geza Pesti

37

Engineered Cementitious Composite May Replace Bridge Deck Joints  

E-print Network

of the same components as traditional portland cement concrete (including cement, aggregate, wa- ter and fly of using this intriguing alternative to deck joints. Research The investigation of ECC was carried out

Li, Victor C.

38

Unmanned Ground Vehicle for Autonomous Non-Destructive Testing of FRP Bridge Decks  

NASA Astrophysics Data System (ADS)

Current non-destructive techniques for defect analysis of FRP bridge decks have a narrow scope. These techniques are very good at detecting certain types of defects but are not robust enough to detect all defects by themselves. For example, infrared thermography (IRT) can detect air filled defects and Ground Penetrating Radar (GPR) is good at detecting water filled ones. These technologies can be combined to create a more robust defect detection scheme. To accomplish this, an Unmanned Ground Vehicle (UGV) has been designed that incorporates both IR and GPR analysis to create a comprehensive defect map of a bridge deck. The UGV autonomously surveys the deck surface and acquires data. The UGV has two 1.5 GHz ground coupled GPR antennas that are mounted on the front of the UGV to collect GPR data. It also incorporates an active heating source and a radiometric IR camera to capture IR images of the deck, even in less than ideal weather scenarios such as cold cloudy days. The UGV is designed so that it can collect data in an assembly line fashion. It moves in 1 foot increments. When moving, it collects GPR data from the two antennas. When it stops it heats a section of the deck. The next time it stops to heat a section, the IR camera is analyzing the preheated deck section while preparing for the next section. Because the data is being continually collected using this method, the UGV can survey the entire deck in an efficient and timely manner.

Klinkhachorn, P.; Mercer, A. Scott; Halabe, Udaya B.; GangaRao, Hota V. S.

2007-03-01

39

Long-Term Chloride Penetration Resistance of Bridge Decks Made With Silica Fume Concretes  

Microsoft Academic Search

Cores were obtained in 2001 and 2002 from four concretes from bridge decks in New York State and one in Ohio and which had been exposed to de-icing salts. The Ohio bridge was 15 years old and made with silica fume concrete (804 pcy cementitious materials with 14.3% silica fume, 0.33 w\\/cm). The New York bridges included a 6 year

R. D. Hooton; E. Bentz; Moon Township

40

Using emissivity-corrected thermal maps to locate deep structural defects in concrete bridge decks  

NASA Astrophysics Data System (ADS)

Dual-band infrared (DBIR) thermal imaging is a promising, noncontact, nondestructive evaluation tool to evaluate the amount of deteriorated concrete on asphalt-covered bridge decks. We conducted proof-of-principle demonstrations to characterize defects in concrete structures which could be detected with DBIR thermal imaging. We constructed two identical concrete slabs with synthetic delaminations, e.g., 1.8-in. thick styrofoam squares, implanted just above the 2-in. deep steel reinforcement bars. We covered one of the slabs with a 2-in. layer of asphalt. We mounted the DBIR cameras on a tower platform, to simulate the optics needed to conduct bridge-deck inspections from a moving vehicle. We detected 4-in. implants embedded in concrete and 9-in. implants embedded in asphalt-cevered concrete. The midday (above ambient) and predawn (below ambient) delamination-site temperatures correlated with the implant sizes. Using DBIR image ratios, we enhanced thermal-constrast and removed emissivity-noise, e.g., from concrete compositional variations and clutter. Using the LLNL/VIEW code, we removed the asphalt thermal-gradient mask to depict the 4-in. deep, 9- in. square, concrete implant site. We plan to image bridge deck defects from a moving vehicle for accurate estimations of the amount of deteriorated concrete impairing the deck integrity. Potential longterm benefits are affordable and reliable rehabilitation for asphalt-covered decks.

DelGrande, Nancy; Durbin, Philip F.

1995-05-01

41

Experimental Analysis of Stiffness of the Riveted Steel Railway Bridge Deck Members' Joints  

NASA Astrophysics Data System (ADS)

The paper deals with the real behaviour of the riveted steel railway bridge deck members' connections with respect to their bending stiffness. Attention is paid to the stringer-to-cross beam connection as well as the cross beam-to-main girder connection. The stiffness of the two connections is investigated on the basis of evaluation of the experimentally determined stress response of the observed structural members to the actual traffic load on an existing railway bridge.

Gocál, Jozef; Hlinka, Richard; Jošt, Jozef; Bahleda, František

2014-12-01

42

Analysis of the wind loading of a bridge deck box section using Proper Orthogonal Decomposition  

Microsoft Academic Search

Proper Orthogonal Decomposition is an effective tool for the stochastic analysis of the wind loading of structures. In this paper Covariance Proper Transformation is applied to the analysis of the wind excitation of a box bridge section. The results of wind tunnel pressure measurements on the stationary and vibrating deck sectional model are used in the analyses. An attempt is

Francesco Ricciardelli; Enrico T. de Grenet; Giovanni Solari

43

Numerical simulations and experimental measurements of steel and ice impacts on concrete for acoustic interrogation of delaminations in bridge decks  

SciTech Connect

Delaminations in bridge decks typically result from corrosion of the top mat of reinforcing steel, which leads to a localized separation of the concrete cover from the underlying concrete. Because delaminations cannot be detected using visual inspection, rapid, large-area interrogation methods are desired to characterize bridge decks without disruption to traffic, without the subjectivity inherent in existing methods, and with increased inspector safety. To this end, disposable impactors such as water droplets or ice chips can be dropped using automatic dispensers onto concrete surfaces to excite mechanical vibrations while acoustic responses can be recorded using air-coupled microphones. In this work, numerical simulations are used to characterize the flexural response of a model concrete bridge deck subject to both steel and ice impactors, and the results are compared with similar experiments performed in the laboratory on a partially delaminated concrete bridge deck slab. The simulations offer greater understanding of the kinetics of impacts and the responses of materials.

Mazzeo, Brian A.; Patil, Anjali N.; Klis, Jeffrey M. [Brigham Young University, Department of Electrical and Computer Engineering, Provo, Utah, 84602 (United States); Hurd, Randy C.; Truscott, Tadd T. [Brigham Young University, Department of Mechanical Engineering, Provo, Utah, 84602 (United States); Guthrie, W. Spencer [Brigham Young University, Department of Civil and Environmental Engineering, Provo, Utah, 84602 (United States)

2014-02-18

44

Numerical simulations and experimental measurements of steel and ice impacts on concrete for acoustic interrogation of delaminations in bridge decks  

NASA Astrophysics Data System (ADS)

Delaminations in bridge decks typically result from corrosion of the top mat of reinforcing steel, which leads to a localized separation of the concrete cover from the underlying concrete. Because delaminations cannot be detected using visual inspection, rapid, large-area interrogation methods are desired to characterize bridge decks without disruption to traffic, without the subjectivity inherent in existing methods, and with increased inspector safety. To this end, disposable impactors such as water droplets or ice chips can be dropped using automatic dispensers onto concrete surfaces to excite mechanical vibrations while acoustic responses can be recorded using air-coupled microphones. In this work, numerical simulations are used to characterize the flexural response of a model concrete bridge deck subject to both steel and ice impactors, and the results are compared with similar experiments performed in the laboratory on a partially delaminated concrete bridge deck slab. The simulations offer greater understanding of the kinetics of impacts and the responses of materials.

Mazzeo, Brian A.; Patil, Anjali N.; Klis, Jeffrey M.; Hurd, Randy C.; Truscott, Tadd T.; Guthrie, W. Spencer

2014-02-01

45

Thermal infrared inspection of FRP bridge decks for health monitoring  

Microsoft Academic Search

Even in the best of economic times, funding for infrastructure maintenance, repair and rehabilitation is never adequate. As infrastructure in the United States continues to age, the funding deficit to simply maintain the existing bridges will continue to soar. Due to the inadequacy of capital allocated for infrastructure repair and rehabilitation, new, more durable construction materials with potentially longer service

Marybeth Miceli; John C. Duke; Michael Horne

2003-01-01

46

Effective presentation of impact-echo data for bridge deck NDE  

NASA Astrophysics Data System (ADS)

Air-Coupled Impact Echo (IE) test is a non-destructive evaluation (NDE) test method, where the dynamic response of an element resulting from an impact event is measured with an air-coupled sensor. IE has been used to characterize damage in concrete bridge decks in a rapid fashion. However, the large amount of data from air-coupled IE tests from bridge decks must be manipulated and presented such that infrastructure engineers can effectively assess the condition of the structure. To address this problem, we used both impact-echo and flexural mode vibrations to characterize the area and degree of delamination damage. The practical nature of this imaging approach is demonstrated experimentally with concrete slabs containing simulated delamination damage.

Oh, T.; Popovics, J. S.

2014-02-01

47

An Automatic Impact-based Delamination Detection System for Concrete Bridge Decks  

SciTech Connect

Delamination of concrete bridge decks is a commonly observed distress in corrosive environments. In traditional acoustic inspection methods, delamination is assessed by the "hollowness" of the sound created by impacting the bridge deck with a hammer or bar or by dragging a chain where the signals are often contaminated by ambient traffic noise and the detection is highly subjective. In the proposed method, a modified version of independent component analysis (ICA) is used to filter the traffic noise. To eliminate subjectivity, Mel-frequency cepstral coefficients (MFCC) are used as features for detection and the delamination is detected by a radial basis function (RBF) neural network. Results from both experimental and field data suggest that the proposed methods id noise robust and has satisfactory performance. The methods can also detect the delamination of repair patches and concrete below the repair patches. The algorithms were incorporated into an automatic impact-bases delamination detection (AIDD) system for field application.

Zhang, Gang; Harichandran, Ronald S.; Ramuhalli, Pradeep

2012-01-02

48

Assessing effects of highway bridge deck runoff on near-by recieving waters in coastal margins using remote monitoring techniques  

E-print Network

ASSESSING EFFECTS OF HIGHWAY BRIDGE DECK RUNOFF ON NEARBY RECEIVING WATERS IN COASTAL MARGINS USING REMOTE MONITORING TECHNIQUES A Thesis by OKE NWANESHIUDU Submitted to the Office of Graduate Studies of Texas A&M University... in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 2004 Major Subject: Civil Engineering ASSESSING EFFECTS OF HIGHWAY BRIDGE DECK RUNOFF ON NEARBY RECEIVING WATERS IN COASTAL MARGINS USING REMOTE...

Nwaneshiudu, Oke

2005-02-17

49

Evaluating Axle Loads of Moving Vehicle Using Bridge Deck Plate Responses  

Microsoft Academic Search

\\u000a A new algorithm to extract influence sequence has been introduced. Using the resulting influence sequences, a way to identify\\u000a the axle loads of moving vehicles has been introduced. The approaches are based on an optimal linear filter design theory.\\u000a The algorithms make use of the strain time histories of a bridge deck plate. The performance of the algorithm has been

Byeong Hwa Kim; Min Seok Park; Heui-Gu Park; In Hwan Bae; Soo Jin Kim; Keum Soo Yeo

50

Flexural behavior of a hybrid FRP and lightweight concrete sandwich bridge deck  

Microsoft Academic Search

This paper presents a new concept for a lightweight hybrid-FRP bridge deck. The sandwich construction consists of three layers: a fiber-reinforced polymer composite (FRP) sheet with T-upstands for the tensile skin, lightweight concrete (LC) for the core and a thin layer of ultra high performance reinforced concrete (UHPFRC) as a compression skin. Mechanical tests on eight hybrid beams were performed

Thomas Keller; Erika Schaumann; Till Vallée

2007-01-01

51

Plans: Aft Gun Platform, Quarters for 16 Gunmen, Poop Deck, ...  

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

Plans: Aft Gun Platform, Quarters for 16 Gunmen, Poop Deck, Boat Deck, House Top, Bridge Deck, Upper Bridge Deck, Navigating Bridge, Forecastle Deck, Gun Platform, Upper Deck, Second Deck and Hold Plan - Mission Santa Ynez, Suisun Bay Reserve Fleet, Benicia, Solano County, CA

52

Application of Noise Cancelling and Damage Detection Algorithms in NDE of Concrete Bridge Decks Using Impact Signals  

SciTech Connect

Delamination is a commonly observed distress in concrete bridge decks. Among all the delamination detection methods, acoustic methods have the advantages of being fast and inexpensive. In traditional acoustic inspection methods, the inspector drags a chain along or hammers on the bridge deck and detects delamination from the 'hollowness' of the sounds. The signals are often contaminated by ambient traffic noise and the detection of delamination is highly subjective. This paper describes the performance of an impact-bases acoustic NDE method where the traffic noise was filtered by employing a noise cancelling algorithm and where subjectivity was eliminated by introducing feature extraction and pattern recognition algorithms. Different algorithms were compared and the best one was selected in each category. The comparison showed that the modified independent component analysis (ICA) algorithm was most effective in cancelling the traffic noise and features consisting of mel-frequency cepstral coefficients (MFCCs) had the best performance in terms of repeatability and separabillty. The condition of the bridge deck was then detected by a radial basis function (RBF) neural network. The performance of the system was evaluated using both experimental and field data. The results show that the selected algorithms increase the noise robustness of acoustic methods and perform satisfactorily if the training data is representative.

Zhang, Gang; Harichandran, Ronald S.; Ramuhalli, Pradeep

2011-09-13

53

State of the Art in the Utilization of Deck Bridges with Encased Filler-Beams in the Standard Construction Practice  

NASA Astrophysics Data System (ADS)

Deck bridges with encased filler-beams have been used in construction for a long time. Nowadays they are employed mainly in the refurbishment of railways and in road construction. Regarding the method of construction, they can be divided into monolithic/cast-in-place (constructed fully in its final location) or prefabricated/precast structures (built at another location and then transported to their final location for placement in the full structure). Both methods of construction have certain advantages and disadvantages. Decision-making and selecting a better alternative depends on the building conditions and a means of transport (whether a road or railway) running on the bridge.

Kvo?ák, Vincent; Kožlejová, Viktória; Chupayeva, Katerina

2013-06-01

54

Evaluation of undersized bioretention stormwater control measures for treatment of highway bridge deck runoff.  

PubMed

Two grassed bioretention cells were constructed in the easement of a bridge deck in Knightdale, North Carolina, USA, in October, 2009. One was intentionally undersized ('small'), while the other was full sized ('large') per current North Carolina standards. The large and small cells captured runoff from the 25- and 8-mm events, respectively. Both bioretention cells employed average fill media depths of 0.65 m and internal water storage (IWS) zones of 0.6 m. Flow-proportional, composite water quality samples were collected and analyzed for nitrogen species, phosphorus species, and TSS. During 13 months of data collection, the large cell's median effluent concentrations and loads were less than those from the small cell. The small cell's TN and TSS load reductions were 84 and 50%, respectively, of those achieved by the large cell, with both cells significantly reducing TN and TSS. TP loads were not significantly reduced by either cell, likely due to low TP concentrations in the highway runoff which may have approached irreducible levels. Outflow pollutant loads from the large and small cell were not significantly different from one another for any of the examined pollutants. The small cell's relative performance provides support for retrofitting undersized systems in urbanized areas where there is insufficient space available for conventional full-sized stormwater treatment systems. PMID:22097087

Luell, S K; Hunt, W F; Winston, R J

2011-01-01

55

Ground penetrating radar and microwave tomography 3D applications for the deck evaluation of the Musmeci bridge in Potenza, Italy  

NASA Astrophysics Data System (ADS)

An extensive experimental and numerical investigation has been carried out to assess the status of the 'Ponte sul Basento' (1967-1976), in the town of Potenza (Basilicata region, southern Italy), better known as the Musmeci bridge. Architecturally, the bridge is a considerable reinforced 20th century concrete structure that was designed and built by the Italian architect Sergio Musmeci (1926-1981). Moreover, the bridge represents an important element of the infrastructural network, linking the city centre to the Potenza-Sicignano highway, crossing the Basento river and the railway close to the main train station of the city. Recently, due to ageing and continuous and significant traffic, the bridge started to be affected by several problems such as water infiltration. Within the presented study, a widespread ground penetrating radar (GPR) survey has been designed to investigate the geometrical characteristics of the bridge deck (Gerber saddles, internal stiffening walls, pillar supports) and detect the presence of defects or damage due to water infiltration and traffic fatigue. Concerning this, a 900 MHz 3D GPR survey has been performed along a zone of one of the lanes on the road surface. Moreover, a second 1500 MHz 3D survey has been carried out at the bottom of the bridge deck in order to gain detailed information about an important structural element of the bridge, the Gerber saddle. Both results have been processed following two approaches: the first a classical time-domain processing session based on commercial software and the use of migration; the second in microwave tomography, an advanced frequency domain automatic PC-based inversion algorithm. In this paper, we present a comparative interpretation of both kinds of processed results, and provide considerations about the investigated structures.

Bavusi, Massimo; Soldovieri, Francesco; Di Napoli, Rosario; Loperte, Antonio; Di Cesare, Antonio; Carlo Ponzo, Felice; Lapenna, Vincenzo

2011-09-01

56

Examination of Single- and Multi-Channel GPR Bridge Deck Condition Assessment Methods with Comparison to Complementary NDE Results  

NASA Astrophysics Data System (ADS)

A sixteen-channel GPR system which houses both longitudinally- and transversely-polarized, 2.0 GHz antenna elements within a single housing was compared with a single-channel GPR system that was separately using both 1.5GHz and 2.6GHz antennas oriented in the transverse polarization, for the purpose of determining effectiveness of bridge deck condition assessment. The multi-channel system has obvious benefits which include closely-spaced GPR antennas (channels) that provide better lateral resolution, as well as combined data sets from co-linear antennas oriented in both the transverse and longitudinal polarizations, which has benefits for imaging within the deck's internal structure. However, the primary objective was to determine whether the multi-channel system would perform in a similar manner to proven single-channel GPR technology during an attenuation-based GPR condition assessment on an older, partially deteriorated deck in northwestern New Jersey that is annually exposed to freeze-thaw conditions as well as de-icing salts. These assessments were made by focusing on identifying the strongest reflections from the upper mat of transversely-oriented rebars within the deck and comparing reflection strength, or conversely, attenuation of the GPR signal, from each of the 'picked' GPR rebar responses. Coordinates for each of the GPR picks, along with amplitude or attenuation measurements, were gridded and contour-plotted for the purpose of identifying areas identified as either relatively deteriorated or sound. Initially, results were compared for data with no applied correction that takes into account GPR signal attenuation with increasing depth within the concrete deck. Final GPR maps were produced incorporating a depth-correction technique similar to what is described by Barnes, et. al., Romero, et. al, and Gucunski, et. al., a process which has been clearly demonstrated to better correlate GPR results with not only ground truth (cores, sounding) but also with other NDE technologies. Not only did all the single- and multi-channel system comparisons generate nearly identical deterioration maps when GPR results were compared and examined, but mapped results obtained from other NDE methods on the same deck were used to identify zones where corrosive environment (electrical resistivity - ER) elastic modulus (ultrasonic surface wave - USW), and identified delaminations (impact-echo - IE) had commonality with the GPR results. A summary of the equipment used, as well as general data collection and analysis procedures is provided for the GPR condition assessments. Brief descriptions of background and references to how the complementary NDT technologies are deployed, and how data are interpreted, are also discussed. Comparative maps for all technologies are used for illustrative purposes.

Romero, Francisco A.; Manacorda, Guido; Simi, Alessandro; Gucunski, Nenad; Parvardeh, Hooman

2013-04-01

57

History-Dependent Bridge Deck Maintenance and Replacement Optimization with Markov Decision Processes  

Microsoft Academic Search

Bridge maintenance and replacement optimization methods use deterioration models to predict the future condition of bridge components. The purpose of this paper is to develop a framework for bridge maintenance optimization using a deterioration model that takes into account aspects of the history of the bridge condition and maintenance, while allowing the use of efficient optimization techniques. Markovian models are

Charles-Antoine Robelin; Samer M. Madanat

2007-01-01

58

Bridge deck surface temperature monitoring by infrared thermography and inner structure identification using PPT and PCT analysis methods  

NASA Astrophysics Data System (ADS)

One of the objectives of ISTIMES project was to evaluate the potentialities offered by the integration of different electromagnetic techniques able to perform non-invasive diagnostics for surveillance and monitoring of transport infrastructures. Among the EM methods investigated, we focused our research and development efforts on uncooled infrared camera techniques due to their promising potential level of dissemination linked to their relative low cost on the market. On the other hand, works were also carried out to identify well adapted implementation protocols and key limits of Pulse Phase Thermography (PPT) and Principal Component Thermography (PCT) processing methods to analyse thermal image sequence and retrieve information about the inner structure. So the first part of this research works addresses infrared thermography measurement when it is used in quantitative mode (not in laboratory conditions) and not in qualitative mode (vision applied to survey). In such context, it requires to process in real time thermal radiative corrections on raw data acquired to take into account influences of natural environment evolution with time, thanks to additional measurements. But, camera sensor has to be enough smart to apply in real time calibration law and radiometric corrections in a varying atmosphere. So, a complete measurement system was studied and developed [1] with low cost infrared cameras available on the market. In the system developed, infrared camera is coupled with other sensors to feed simplified radiative models running, in real time, on GPU available on small PC. The whole measurement system was implemented on the "Musmeci" bridge located in Potenza (Italy). No traffic interruption was required during the mounting of our measurement system. The infrared camera was fixed on top of a mast at 6 m elevation from the surface of the bridge deck. A small weather station was added on the same mast at 1 m under the camera. A GPS antenna was also fixed at the basis of the mast and at a same elevation than the bridge deck surface. This trial took place during 4 days, but our system was leaved in stand alone acquisition mode only during 3 days. Thanks to the software developed and the small computer hardware used, thermal image were acquired at a frame rate of 0.1 Hz by averaging 50 thermal images leaving the original camera frame rate fixed at 5 Hz. Each hour, a thermal image sequence was stored on the internal hard drive and data were also retrieved, on demand, by using a wireless connection and a tablet PC. In the second part of this work, thermal image sequences analysis was carried out. Two analysis approaches were studied: one based on the use of the Fast Fourier Transform [2] and the second one based on the Principal Component Analysis [3-4]. Results obtained show that the inner structure of the deck was identified though thermal images were affected by the fact that the bridge was open to traffic during the whole experiments duration. ACKNOWLEDGEMENT - The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement n° 225663. References [1] Dumoulin J. and Averty R., « Development of an infrared system coupled with a weather station for real time atmospheric corrections using GPU computing: Application to bridge monitoring", QIRT 2012, Naples, Italy, June 2012. [2] Cooley J.W., Tukey J.W., "An algorithm for the machine calculation of complex Fourier series", Mathematics of Computation, vol. 19, n° 90, 1965, p. 297-301. [3] Rajic N., "Principal component thermography for flaw contrast enhancement and flaw depth characterization in composite structures", Composite Structures, vol 58, pp 521-528, 2002. [4] Marinetti S., Grinzato E., Bison P. G., Bozzi E., Chimenti M., Pieri G. and Salvetti O. "Statistical analysis of IR thermographic sequences by PCA," Infrared Physics & Technology vol 46 pp 85-91, 2004.

Dumoulin, Jean

2013-04-01

59

Design and Construction of a Bridge Deck using Mild and Post-Tensioned FRP Bars  

Microsoft Academic Search

Synopsis: Synopsis: Synopsis: Synopsis: Synopsis: The type of structure selected for this research project is a four-span continuous concrete slab having GFRP bars for top and bottom mats and CFRP reinforcement for internal post-tensioning. The bridge is located in Rolla, Missouri (Southview Drive on Carter Creek). One lane of the bridge was already built using a conventional four-cell steel reinforced

R. Fico; N. Galati; A. Prota; A. Nanni

60

Stopper-Bearing System – A Solution to Displacement Control of Bridge Decks  

E-print Network

of the SBS is obtained from ABAQUS and used to define the SBS within reinforced concrete analytical bridge models developed in SAP2000, which are subjected to the 1999 Chi- Chi, Taiwan earthquake ground motion (1.01g - E-W component and 0.43g - N-S component...

Tsai, Yi-Te

2010-10-12

61

Smart Control of a Geothermally Heated Bridge Deck Stephen C. Jenks (o) 580-767-4374  

E-print Network

Beak International Incorporated (f) 905-794-2338 14 Abacus Road KPandit@beak.com Brampton, Ontario, L6T National Weather Service (NWS) forecasts to prevent bridge icing without the use of salt or other chemical appears on approaching sections of road), represents a major transportation safety issue. A common

62

Determining bridge deck deterioration through the use of three-dimensional photogrammetry  

NASA Astrophysics Data System (ADS)

The bridge inspection industry has yet to utilize a rapidly growing technology that shows promise to help improve the inspection process. This thesis investigates the abilities that 3D photogrammetry is capable of providing to the bridge inspector for a number of deterioration mechanisms. The technology can provide information about the surface condition of some bridge components, primarily focusing on the surface defects of a concrete bridge which include cracking, spalling and scaling. Testing was completed using a Canon EOS 7D camera which then processed photos using AgiSoft PhotoScan to align the photos and develop models. Further processing of the models was done using ArcMap in the ArcGIS 10 program to view the digital elevation models of the concrete surface. Several experiments were completed to determine the ability of the technique for the detection of the different defects. The cracks that were able to be resolved in this study were a 1/8 inch crack at a distance of two feet above the surface. 3D photogrammetry was able to be detect a depression of 1 inch wide with 3/16 inch depth which would be sufficient to measure any scaling or spalling that would be required be the inspector. The percentage scaled or spalled was also able to be calculated from the digital elevation models in ArcMap. Different camera factors including the distance from the defects, number of photos and angle, were also investigated to see how each factor affected the capabilities. 3D photogrammetry showed great promise in the detection of scaling or spalling of the concrete bridge surface.

Evans, Darrin C.

63

7. DETAIL OF DECK TRUSS SPANNING CANAL. THIS DECK TRUSS ...  

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

7. DETAIL OF DECK TRUSS SPANNING CANAL. THIS DECK TRUSS WA ALSO ERECTED IN 1893 AS PART OF AN EXTENSIVE RECONSTRUCTION OF THE BRIDGE. LOOKING NORTHEAST FROM SOUTH SIDE OF CANAL. - Illinois Central Railroad, Illinois River Bridge, Spanning Illinois River, La Salle, La Salle County, IL

64

HERMES: a high-speed radar imaging system for inspection of bridge decks  

SciTech Connect

Corrosion of rebar in concrete bridges causes subsurface cracks and is a major cause of structural degradation that necessitates repair or replacement. Early detection of corrosion effects can limit the location and extent of necessary repairs, while providing long-term information about the infrastructure status. Most current detection methods, however, are destructive of the road surface and require closing or restricting traffic while the tests are performed. A ground-penetrating radar imaging system has been designed and developed that will perform the nondestructive evaluation of road-bed cracking at traffic speeds; i.e., without the need to restrict traffic flow. The first-generation system (called the HERMES bridge inspector), consists of an offset-linear array of 64 impulse radar transceivers and associated electronics housed in a trailer. Computers in the trailer and in the towing vehicle control the data acquisition, processing, and display. Cross-road resolution is three centimeters at up to 30 cm in depth, while down-road resolution depends on speed; 3 cm below 20 mph up to 8 cm at 50 mph. A two-meter- wide path is inspected on each pass over the roadway. This paper, describes the design of this system, shows preliminary results, and lays out its deployment schedule.

Azevedo, S.G.

1996-10-26

65

Reflected Deck Plan and Deck Plan from Pre2004 Fire and ...  

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

Reflected Deck Plan and Deck Plan from Pre-2004 Fire and Existing Condition, 2009 - Boston & Maine Railroad, Berlin Branch Bridge #148.81, Formerly spanning Moose Brook at former Boston & Maine Railroad, Gorham, Coos County, NH

66

SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH ...  

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

SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN vSHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN SHARP OBLIQUE PERSPECTIVE OF DECK AND APPROACH SPANS ALONG WITH PRINCIPLE CANTILEVER SPAN - Snake River Bridge at Lyons' Ferry, State Route 261 spanning Snake River, Starbuck, Columbia County, WA

67

11. Standing on westerly fender at edge of bridge looking ...  

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

11. Standing on westerly fender at edge of bridge looking easterly, showing horizontal beams for deck and cross beams (reflection of steel grating on deck). Also shows bridge guardrail. - Colusa Bridge, Spanning Sacramento River, Colusa, Colusa County, CA

68

Bridges  

MedlinePLUS

... is made to replace one or more missing teeth. Bridges can be supported in any of three ways: ... The dentist may also make impressions of the teeth. The bridge is placed at later visits. On average, bridges ...

69

Permeable Pavement  

NSDL National Science Digital Library

Students investigate how different riparian ground covers, such as grass or pavement, affect river flooding. They learn about permeable and impermeable materials through the measurement how much water is absorbed by several different household materials in a model river. Students use what they learn to make recommendations for engineers developing permeable pavement. Also, they consider several different limitations for design in the context of a small community.

Integrated Teaching And Learning Program

70

Bridges  

NSDL National Science Digital Library

Bridges come in a wide variety of sizes, shapes, and lengths and are found all over the world. It is important that bridges are strong so they are safe to cross. Design and build a your own model bridge. Test your bridge for strength using a force sensor that measures how hard you pull on your bridge. By observing a graph of the force, determine the amount of force needed to make your bridge collapse.

2012-07-19

71

LRRB Pavement Management Systems Pavement Management Systems  

E-print Network

LRRB Pavement Management Systems Pavement Management Systems Presented by: Michael Marti SRF for implementing and monitoring research results (RIC) #12;LRRB Pavement Management Systems LRRB Structure LRRB and counties in implementing Pavement Management and/or using better §Project produced several deliverables

Minnesota, University of

72

Deck addition at Palmer <  

NSF Publications Database

... the following information related to the placement of a new deck at the BioLab Building at Palmer ... be moved since they would interfere with placement of the deck. No antarctic wildlife use the ...

73

Bridges  

NSDL National Science Digital Library

Bridges have been drawing plenty of attention lately, with numerous construction projects around the world and the controversy over the deteriorating bridge infrastructure in the US. They have been an essential part of transportation for hundreds of years, and it is the job of civil engineers to design the safest, most durable bridges possible.Bridge Basics (1) has a large list of different types of bridges with brief explanations. This is a good place for beginners to learn about various bridge designs and parts. The Web site of a nationwide engineering design contest (2) offers free West Point Bridge Designer software. This educational tool allows the user to create a custom virtual bridge model. Although this year's contest is over, another one is planned for next year. Rice University is the home of the Bridges Project (3), a comprehensive database of "all 74 1,000 ft. span bridges in the United States." For each of these, a short description and construction history are given, and some include photos and other interesting facts. The Gibraltar Bridge, a proposed nine mile bridge that connects Europe and Africa, was recently featured on the Discovery Channel's Engineering the Impossible (4). This Web site discusses its specifications, as well as the many challenges that must be overcome for it to be a reality. The Innovative Bridge Research and Construction Program (5) investigates new technologies that can be used in the "repair, rehabilitation, replacement and new construction of bridges" in the US. This is particularly important now, since a large portion of the countries bridges are badly in need of maintenance. A more specific area of research being conducted to protect bridge infrastructure involves the corrosion of steel reinforcements in concrete bridges (6). The material on this site provides an in-depth report on the findings of the Turner-Fairbank Highway Research Center. Technical reports and papers are published in the bimonthly Journal of Bridge Engineering (7). It covers almost any topic related to bridges, and is offered free online by the American Society of Civil Engineers. Fun activities for grade school students are given on this page (8). Separated into three levels of difficulty, the projects give students freedom to learn about and design any kind of bridge structure that interests them. A list of materials and criteria are given, but there are few explicit instructions, allowing for maximum creativity.

Leske, Cavin.

74

6. DETAIL OF STEEL GUARDRAIL, CONCRETE CURB AND DECK EXPANSION ...  

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

6. DETAIL OF STEEL GUARDRAIL, CONCRETE CURB AND DECK EXPANSION JOINT, WITH DRY BED OF RIO PUERCO IN BACKGROUND. VIEW TO EAST. - Rio Puerco Bridge, Mainline Road, spanning Rio Puerco, Holbrook, Navajo County, AZ

75

4. VIEW FROM EAST ABUTMENT SHOWING BASCULE LEAFS AND DECK ...  

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

4. VIEW FROM EAST ABUTMENT SHOWING BASCULE LEAFS AND DECK SUBSTRUCTURE. - Chicago River Bascule Bridge, Monroe Street, Spanning South Branch of Chicago River at Monroe Street, Chicago, Cook County, IL

76

4. LOOKING SOUTHWEST AT LATTICED GUARDRAIL, DIAGONALS, ASPHALT DECK AND ...  

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

4. LOOKING SOUTHWEST AT LATTICED GUARDRAIL, DIAGONALS, ASPHALT DECK AND LACED ANGLES ON VERTICALS - Wayne County Bridge No. 122, Spanning West Fork Whitewater River at Main Street, Milton, Wayne County, IN

77

10. Detail of deck underside, from the Minnesota bank, looking ...  

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

10. Detail of deck underside, from the Minnesota bank, looking northwest - Enloe Bridge No. 90021, Spanning Red River of North between Minnesota & North Dakota on County State Aid Highway 28, Wolverton, Wilkin County, MN

78

Bridges  

NSDL National Science Digital Library

Through a five-lesson series that includes numerous hands-on activities, students are introduced to the importance and pervasiveness of bridges for connecting people to resources, places and other people, with references to many historical and current-day examples. In learning about bridge typesâarch, beam, truss and suspensionâstudents explore the effect of tensile and compressive forces. Students investigate the calculations that go into designing bridges; they learn about loads and cross-sectional areas by designing and testing the strength of model piers. Geology and soils are explored as they discover the importance of foundations, bearing pressure and settlement considerations in the creation of dependable bridges and structures. Students learn about brittle and ductile material properties. Students also learn about the many cost factors that comprise the economic considerations of bridge building. Bridges are unique challenges that take advantage of the creative nature of engineering.

Integrated Teaching And Learning Program

79

21. View of Clark Fork Vehicle Bridge facing west. Looking ...  

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

21. View of Clark Fork Vehicle Bridge facing west. Looking at bridge deck, guard rail, juncture of two bridge spans. - Clark Fork Vehicle Bridge, Spanning Clark Fork River, serves Highway 200, Clark Fork, Bonner County, ID

80

CONCRETE PAVEMENT Reference Manual  

E-print Network

CONCRETE PAVEMENT Reference Manual Prepared for Federal Highway Administration Office of Pavement by National Concrete Pavement Technology Center at Iowa State University 2711 South Loop Drive, Suite 4700 No. 3. Recipient's Catalog No. 4. Title and Subtitle 5. Report Date February 2008 Concrete Pavement

81

VIEW OF BRIDGE, LOOKING SOUTHWEST, WITH SOUTHERN PACIFIC RAILROAD BRIDGE ...  

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

VIEW OF BRIDGE, LOOKING SOUTHWEST, WITH SOUTHERN PACIFIC RAILROAD BRIDGE IN BACKGROUND. THE PAVEMENT OF THE NORTH APPROACH IS SEEN BURIED ON THE RIGHT. ROADWAY (CENTER) CROSSES THE USUALLY DRY CHANNEL OF THE SALT RIVER. A BALUSTRADE OF THE MILL AVENUE BRIDGE IS SEEN AT THE LOWER LEFT CORNER - Ash Avenue Bridge, Spanning Salt River at Foot of Ash Avenue, Tempe, Maricopa County, AZ

82

SOURCE: UNIVERSITY OF CALIFORNIA PAVEMENT RESEARCH CENTER PAVEMENT TECHNOLOGY UPDATE  

E-print Network

SOURCE: UNIVERSITY OF CALIFORNIA PAVEMENT RESEARCH CENTER PAVEMENT TECHNOLOGY UPDATE at the California Department of Transportation. Content is provided by the University of California Pavement Research Center. The University of California Pavement Research Center Using innovative research and sound

California at Berkeley, University of

83

11. Short subways led to the lower deck of the ...  

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

11. Short subways led to the lower deck of the Detroit-Superior Bridge. Street cars entered the subways through open wells located in the center of the roadways. This undated photograph shows the Superior Avenue entrance. The view is looking west. Photograph courtesy Office of the Cuyahoga County Engineer in Cleveland, Ohio. - Detroit Superior High Level Bridge, Cleveland, Cuyahoga County, OH

84

Control of Vibrations due to Moving Loads on Suspension Bridges  

Microsoft Academic Search

The flexibility and low damping of the long span suspended cab les in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck

M. Zribi; N. B. Almutairi; M. Abdel-Rohman

2006-01-01

85

Modeling and characterization of fiber-reinforced plastic honeycomb sandwich panels for highway bridge applications  

Microsoft Academic Search

Fiber-reinforced plastic (FRP) composite decks have been increasingly used in highway bridge applications, both in new construction and rehabilitation and replacement of existing bridge decks. Recent applications have demonstrated that FRP honeycomb panels can be effectively and economically used for highway bridge deck systems. This paper is concerned with design modeling and experimental characterization of a FRP honeycomb panel with

Julio F Davalos; Pizhong Qiao; X Frank Xu; Justin Robinson; Karl E Barth

2001-01-01

86

Future Flight Decks  

NASA Technical Reports Server (NTRS)

The evolution of commercial transport flight deck configurations over the past 20-30 years and expected future developments are described. Key factors in the aviation environment are identified that the authors expect will significantly affect flight deck designers. One of these is the requirement for commercial aviation accident rate reduction, which is probably required if global commercial aviation is to grow as projected. Other factors include the growing incrementalism in flight deck implementation, definition of future airspace operations, and expectations of a future pilot corps that will have grown up with computers. Future flight deck developments are extrapolated from observable factors in the aviation environment, recent research results in the area of pilot-centered flight deck systems, and by considering expected advances in technology that are being driven by other than aviation requirements. The authors hypothesize that revolutionary flight deck configuration changes will be possible with development of human-centered flight deck design methodologies that take full advantage of commercial and/or entertainment-driven technologies.

Arbuckle, P. Douglas; Abbott, Kathy H.; Abbott, Terence S.; Schutte, Paul C.

1998-01-01

87

STONE PAVEMENTS IN DESERTS  

Microsoft Academic Search

Stone pavements are armored surfaces comprising intricate mosaics of coarse particles, usually only one or two stones thick, set on or in fine material. They occur widely in many unvegetated areas, and preeminently in hot deserts. Pavement studies in several deserts, and especially in Chile and California, suggest that: 1) deflation may be a relatively unimportant process of pavement formation;

RONALD U. COOKE

1970-01-01

88

Fatigue performance of welded aluminum deck structures  

SciTech Connect

Aluminum alloys are used increasingly in load carrying structures where low weight and low maintenance costs are at a premium. Helicopter decks, structures for living quarters and personnel transfer bridges between platforms are examples of offshore applications. While these structures are not usually subjected to high fatigue loads, the increasing use of aluminum in high speed ships, and more recently in highway bridge structures, makes the question of fatigue performance more important. In this paper the fatigue properties of small scale weldments in an AA6005 alloy are compared with the results of fatigue tests on full scale sections of welded extrusions in the same material, which were used in an aluminum bridge deck structure. The fatigue performance is also compared with the fatigue clauses in the new British design code BS8118 for aluminium structures and the proposed Eurocode 9. The prospects of using a new joining technique, friction stir welding (FSW), in the production of large scale panels for deck and ship hull structures is discussed. The FSW process is described briefly, and some fatigue test data are presented.

Haagensen, P.J.; Ranes, M.; Kluken, A.O.; Kvale, I.

1996-12-01

89

Reconstruction of a pavement geothermal deicing system  

SciTech Connect

In 1948, US 97 in Klamath Falls, Oregon was routed over Esplanade Street to Main Street and through the downtown area. In order to widen the bridge across the US Bureau of Reclamation A Canal and to have the road cross under the Southern Pacific Railroad main north-south line, a new bridge and roadway were constructed at the beginning of this urban route. Because the approach and stop where this roadway intersected Alameda Ave (now Hwy 50 -- Eastside Bypass) caused problems with traffic getting traction in the winter on an adverse 8% grade, a geothermal experiment in pavement de-icing was incorporated into the project. A grid system within the pavement was connected to a nearby geothermal well using a downhole heat exchanger (DHE). The 419-foot well provided heat to a 50-50 ethylene glycol-water solution that ran through the grid system at about 50 gpm. This energy could provide a relatively snow free pavement at an outside temperature of {minus}10 F and snowfall up to 3 inches per hour, at a heat requirement of 41 Btu/hr/ft{sup 2}. Over time, the well temperature dropped from 143 to 98 F at the surface. The bridge and surface pavement, geothermal well, and associated equipment were modified. This paper describes the modifications.

Lund, J.W. [Geo-Heat Center, Klamath Falls, OR (United States)

1999-03-01

90

4/28/2010 1Porous Pavements Porous Pavements  

E-print Network

4/28/2010 1Porous Pavements Porous Pavements for Stormwater Restoration in Urban Environments Cliff Aichinger Ramsey-Washington Metro Watershed District #12;4/28/2010 2Porous Pavements Porous Pavements Why am new volume reduction rules. Porous pavement is one of a relative few BMPs that address stormwater

Minnesota, University of

91

12th Annual Minnesota Pavement  

E-print Network

12th Annual Minnesota Pavement Conference: Session Summaries Conference Sponsors: Minnesota Research Alliance (TERRA) Pavement Research Institute (PRI) Hosted by: Center for Transportation Studies provides information to practitioners and others in pavement design, construction, and maintenance

Minnesota, University of

92

Adaptive prediction of pavement performance  

E-print Network

. This adjustment is considered for each category of pavement distress separately. The computer program has been tested using field data from Long Term Pavement Performance Project (LTPP) and TxDOT Pavement Management Information System (PMIS) data collected...

Zulyaminayn, Mohammed

2012-06-07

93

Maintaining Minnesota's Unique Bridge Inventory  

E-print Network

Brinckerhoff Minneapolis, Minnesota Blatnik and Bong Bridges Wire Rope Replacement: #12;Blatnik and Bong Bridges Wire Rope Replacement · Configuration and existing condition of the deck suspender system;Blatnik and Bong Bridges Wire Rope Replacement · In 2007, a fracture critical inspection of the Blatnik

Minnesota, University of

94

INNOVATIVE DESIGN AND TESTING OF A SEISMIC RETROFITTED STEEL DECK TRUSS  

E-print Network

INNOVATIVE DESIGN AND TESTING OF A SEISMIC RETROFITTED STEEL DECK TRUSS BRIDGE Dr. Majid Sarraf, P at Imbsen and Associates Inc. in Sacramento, CA. He is a lead project engineer, seismic analyst and retrofit of building and bridge structures, seismic evaluation and retrofit of bridges and behavior of steel

Bruneau, Michel

95

4. View in foreground of the deck of the Viaduct. ...  

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

4. View in foreground of the deck of the Viaduct. The ornamental wrought iron railing, sandstone sidewalks, and cobblestone roadway are visible. The bridge accommodated two streetcar lines flanked by two lanes of vehicular traffic. In the background is the Detroit- Superior High Level Bridge, which replaced the viaduct. View is looking Southwest. - Superior Avenue Viaduct, Cleveland East & West side, Cuyahoga Valley Vicinity, Cleveland, Cuyahoga County, OH

96

22. View is from the deck, looking down to the ...  

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

22. View is from the deck, looking down to the junction of the last pony truss and the first through truss. This shows how the respective end posts are embedded into the concrete pier extension. There are only two of these, located on each end of pier #6. - Weidemeyer Bridge, Spanning Thomes Creek at Rawson Road, Corning, Tehama County, CA

97

5. DECK FROM SOUTH, ON EAST SIDEWALK. LOOKING NORTH. ...  

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

5. DECK FROM SOUTH, ON EAST SIDEWALK. LOOKING NORTH. - Route 31 Bridge, New Jersey Route 31, crossing disused main line of Central Railroad of New Jersey (C.R.R.N.J.) (New Jersey Transit's Raritan Valley Line), Hampton, Hunterdon County, NJ

98

6. DECK OF SIDEWALK AND GUARD RAILS. LOOKING NORTH. ...  

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

6. DECK OF SIDEWALK AND GUARD RAILS. LOOKING NORTH. - Route 31 Bridge, New Jersey Route 31, crossing disused main line of Central Railroad of New Jersey (C.R.R.N.J.) (New Jersey Transit's Raritan Valley Line), Hampton, Hunterdon County, NJ

99

Millimeter-wave nondestructive evaluation of pavement conditions  

NASA Astrophysics Data System (ADS)

The United States is suffering from an aging civil infrastructure crisis. Key to recovery are rapid inspection technologies like that being investigated by the VOTERS project (Versatile Onboard Traffic Embedded Roaming Sensors), which aims to outfit ordinary road vehicles with compact low-cost hardware that enables them to rapidly assess and report the condition of roadways and bridge decks free of driver interaction. A key piece of hardware, and the focus of this paper, is a 24 GHz millimeter-wave radar system that measures the reflectivity of pavement surfaces. To account for the variability of real-world driving, such as changes in height, angle, speed, and temperature, a sensor fusion approach is used that corrects MWR measurements based on data from four additional sensors. The corrected MWR measurements are expected to be useful for various characterization applications, including: material type; deterioration such as cracks and potholes; and surface coverage conditions such as dry, wet, oil, water, and ice. Success at each of these applications is an important step towards achieving the VOTERS objective, however, this paper focuses on surface coverage, as whatever covers the driving surface will be most apparent to the MWR sensor and if not accounted for could significantly limit the accuracy of other applications. Contributions of the paper include findings from static lab tests, which validate the approach and show the effects of height and angle. Further contributions come from lab and in-field dynamic tests, which show the effects of speed and demonstrate that the MWR approach is accurate under city driving conditions.

Vines-Cavanau, David; Busuioc, Dan; Birken, Ralf; Wang, Ming

2012-04-01

100

Pavement Thickness Design Parameter  

E-print Network

consuming · Several methods available, but design information generally the same · Terminology: #12;Pavement Thickness Design · Good design uses these parameters: ­ Soil characteristics (subgrade) ­ Soil compaction Distribution ­ HMA ­ PCC #12;Pavement Thickness Design · Soil Resilient Modulus MR ­ Property of the soil

101

Asphalt in Pavement Maintenance.  

ERIC Educational Resources Information Center

Maintenance methods that can be used equally well in all regions of the country have been developed for the use of asphalt in pavement maintenance. Specific information covering methods, equipment and terminology that applies to the use of asphalt in the maintenance of all types of pavement structures, including shoulders, is provided. In many…

Asphalt Inst., College Park, MD.

102

Pavement management practices. Final report  

SciTech Connect

This synthesis will be of interest to pavement designers, maintenance engineers, and others responsible for the management of highway pavements. Information is presented on pavement management systems - the established, documented procedures used to treat all activities involved in providing and sustaining pavements in an acceptable condition. As highway agencies focus more attention on maintenance and rehabilitation of highway networks, the use of some form of a pavement management system becomes increasingly important. This report of the Transportation Research Board describes the features, applicability, and used of a pavement management system and recommends five general steps for implementing a new pavement management system or improving an existing system.

Peterson, D.E.

1987-11-01

103

Loose Canons on Deck  

E-print Network

Posted originally on the Archive of Our Own at http://archiveofourown.org/works/592681. Rating: General Audiences Archive Warning: No Archive Warnings Apply Category: Gen Fandom: Mina de Malfois Character: Mina de Malfois - Character, Josh Amos... Additional Tags: Fandom Stats: Published: 2012-12-14 Words: 4215 Loose Canons on Deck by Kadorienne Summary Josh has been flooding fandom with old paper 'zine fics, and Mina is suspected of pseuicide. Notes Thank you to Grey Bard, invaluable humor consultant...

2012-12-24

104

24. Detail view north under bridge showing arched bascule girder, ...  

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

24. Detail view north under bridge showing arched bascule girder, deck girders and cross beams, and bracing of east bascule leaf. - Yellow Mill Bridge, Spanning Yellow Mill Channel at Stratford Avenue, Bridgeport, Fairfield County, CT

105

22. View of Clark Fork Vehicle Bridge facing downwest side. ...  

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

22. View of Clark Fork Vehicle Bridge facing down-west side. Looking at road deck and vertical laced channel. - Clark Fork Vehicle Bridge, Spanning Clark Fork River, serves Highway 200, Clark Fork, Bonner County, ID

106

10. HISTORIC PHOTOGRAPH, DETAIL OF BRIDGE UNDER CONSTRUCTION, SUPPORT FOR ...  

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

10. HISTORIC PHOTOGRAPH, DETAIL OF BRIDGE UNDER CONSTRUCTION, SUPPORT FOR ROAD DECK AND BRACING BEING PLACED, CA. 1935. COLLECTION CONNECTICUT DEPARTMENT OF TRANSPORTATION. - Merritt Parkway, Saugatuck River Bridge, Spanning Saugatuck River, Westport, Fairfield County, CT

107

9. CLOSEUP VIEW OF PORTION OF SEGMENTED CURB ON BRIDGE ...  

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

9. CLOSE-UP VIEW OF PORTION OF SEGMENTED CURB ON BRIDGE DECK, LOOKING SOUTH - Escalante River Bridge, Spanning Escalante River at State Route 12, 9.5 miles East of Escalante, Escalante, Garfield County, UT

108

6. DETAIL VIEW OF SINGLE PANEL POINTS TAKEN FROM BRIDGE ...  

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

6. DETAIL VIEW OF SINGLE PANEL POINTS TAKEN FROM BRIDGE DECK, SHOWING CONNECTION BETWEEN VERTICAL AND UPPER CHORD MEMBER. - White Bowstring Arch Truss Bridge, Spanning Yellow Creek at Cemetery Drive (Riverside Drive), Poland, Mahoning County, OH

109

Permeable Pavements, Green Roofs, and Cisterns  

E-print Network

Permeable Pavements, Green Roofs, and Cisterns Stormwater Treatment Practices for Low site planning and engineer- pavements, green roofs, and cisterns, are ing to reduce or prevent cooperating. #12;Permeable Pavements What are they? Permeable pavements provide alternatives to standard

Hunt, William F.

110

PAVEMENT TECHNOLOGY UPDATE This Technology Transfer Program  

E-print Network

PAVEMENT TECHNOLOGY UPDATE This Technology Transfer Program publication is funded by the Division by the University of California Pavement Research Center. The University of California Pavement Research Center Using innovative research and sound engineering principles to improve pavement structures, materials

California at Berkeley, University of

111

Pavement conference..............2 Eno award ...............................3  

E-print Network

· Pavement conference..............2 · Eno award ...............................3 · ITSO conference work with intelligent pavement, which elimi- nates the need for external sensors by enabling the pavement itself to detect vehicles. Yu cre- ates the pavement by incorporating carbon nanotubes

Minnesota, University of

112

Pervious Pavement System Evaluation  

EPA Science Inventory

Porous pavement is a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete pavers as a popular implementation. The pavers themselves are impermeable, but the spaces between the pavers are backfilled with washed, grade...

113

10. DECK VIEW FORWARD FROM MAIN DECK TO FORECASTLE. NOTE ...  

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

10. DECK VIEW FORWARD FROM MAIN DECK TO FORECASTLE. NOTE PIPE FITTING FOR OIL PUMPING SYSTEM (DISCHARGE). THE HATCH OPENINGS TO RIGHT ARE ABOVE THE SHIP'S BOILER ROOM. - Ship "Falls of Clyde", Hawaii Maritime Center,Pier 7, Honolulu, Honolulu County, HI

114

15. Fifth Melan Bridge on tour route, Union Avenue near ...  

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

15. Fifth Melan Bridge on tour route, Union Avenue near Park Boundary, deck view to the north. (bridge has now been replaced with box culvert.) - Vicksburg National Military Park Roads & Bridges, Melan Arch Bridges, Spanning various tributaries at Confederate Avenue, Vicksburg, Warren County, MS

115

13. Looking north, from the southern approach to the bridge. ...  

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

13. Looking north, from the southern approach to the bridge. The bridge deck, which is concrete with several patch coats of asphalt (now chiefly gravel and some turf), demonstrates a sharp gradient from the abutment to the bridge center line. - Vigo County Bridge No. 139, Spanning Sugar Creek at Seventy-fourth Place, Terre Haute, Vigo County, IN

116

Demonstration of dual-band infrared thermal imaging at Grass Valley Creek bridges  

SciTech Connect

We demonstrated dual-band infrared (DBIR) thermal imaging at the Grass Valley Creek Bridges near Redding CA. DBIR thermal imaging is an enabling technology for rapid, reliable, bridge deck inspections while minimizing lane closures. bridge-deck inspections were conducted from a mobile DBIR bridge inspection laboratory during November 2-3, 1995. We drove this self-contained unit at limited highway speeds over 0.4 lane miles of bridge deck. Using two thermal IR bands, we distinguished delaminations from clutter. Clutter, or unwanted thermal detail, occurs from foreign materials or uneven shade on the bridge deck surface. By mapping the DBIR spectral- response differences at 3-5 {mu}m and 8-12 {mu}m, we removed foreign material clutter. By mapping the deck diurnal thermal inertia variations, we removed clutter from uneven shade. Thermal inertia is a bulk deck property, the square root of thermal conductivity x density x heat capacity. Delaminated decks have below-average thermal inertias, or above-average day-night temperature excursions. Compared to normal decks areas, delaminated deck areas were typically 2 or 3 {degrees}C warmer at noon, and 0.5{degrees}C cooler at night. The mobile DBIR bridge inspection laboratory is currently undergoing extensive testing to examine bridges by the Federal Highway Administration.

Del Grande, N. K.; Durbin, P.F.; Logan, C.M.; Perkins, D.E.; Schich, P.C.

1996-11-01

117

Nondestructive evaluation inspection of the Arlington Memorial Bridge using a robotic assisted bridge inspection tool (RABIT)  

NASA Astrophysics Data System (ADS)

The information presented in this report provides a detailed assessment of the condition of the Arlington Memorial Bridge (AMB) deck. The field-data collection was obtained by both the RABIT™ Bridge Inspection Tool and a number of semi-automated non-destructive evaluation (NDE) tools. The deployment of the semi-automated NDE tools was performed to inspect the AMB deck condition and also to validate data obtained by the RABIT™ Bridge Inspection Tool. Data mining and analysis were accomplished through enhanced data interpretation and visualization capabilities using advanced data integration, fusion, and 2D rendering. One of the major challenges that the research team had to overcome in assessing the condition of the AMB deck was the presence of an asphalt overlay on the entire bridge deck.

Gucunski, Nenad; Boone, Shane D.; Zobel, Rob; Ghasemi, Hamid; Parvardeh, Hooman; Kee, Seong-Hoon

2014-04-01

118

POROUS PAVEMENT: RESEARCH; DEVELOPMENT; AND DEMONSTRATION  

EPA Science Inventory

This paper discusses the U.S. Environmental Protection Agency's porous pavement research program along with the economics, advantages, potential applications, and status and future research needs of porous pavements. Porous pavements are an available stormwater management techniq...

119

Binzhou Perpetual Pavement Test Road  

Microsoft Academic Search

Expressway construction has been carried out on a large-scale in China. Vigorous economical development has caused rapid growth in traffic volume and truck axle loads creating a severe challenge for the pavement structure design. Therefore, the high-performance and low- maintenance cost of a long-life perpetual pavement structure is gaining attention. This paper discusses the first perpetual asphalt pavement test road

Yongshun Yang; Jincheng Wei; Wang Lin; David Timm; Gerald Huber

2009-01-01

120

CRACKSCOPEAUTOMATIC PAVEMENT CRACKING INSPECTION SYSTEM  

E-print Network

0-5708-P4 CRACKSCOPEAUTOMATIC PAVEMENT CRACKING INSPECTION SYSTEM Authors: Bugao Xu, Ph.D. and P/O) ................................................................................................... 11 3.1.3 Crack

Texas at Austin, University of

121

46 CFR 116.425 - Deck coverings.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Deck coverings. 116.425 Section 116.425 Shipping COAST GUARD, DEPARTMENT OF HOMELAND... CONSTRUCTION AND ARRANGEMENT Fire Protection § 116.425 Deck coverings. (a) Except as...

2010-10-01

122

Active aerodynamic stabilisation of long suspension bridges  

Microsoft Academic Search

The paper describes the addition of actively controlled aerodynamic appendages (flaps) attached along the length of the bridge deck to dampen wind-induced oscillations in long suspension bridges. A novel approach using control systems methods for the analysis of dynamic stability is presented. In order to make use of control analysis and design techniques, a linear model of the structural and

Henrik Ditlev Nissen; Paul Haase Sørensen; Ole Jannerup

2004-01-01

123

International Symposium on Pavement LCA (Pavement LCA 2014) TRB Co-Sponsored  

E-print Network

International Symposium on Pavement LCA (Pavement LCA 2014) TRB Co-Sponsored (Sustainable Pavements AFD00(1)) FHWA Co-Sponsored (Sustainable Pavement Task Group) Location: UC Davis Campus Conference Assessment (LCA) for pavements. The workshop will be coordinated with activities of the FWHA Sustainable

California at Davis, University of

124

Green Water on Ship Decks Marilena Greco  

E-print Network

Seakeeping Solver Shallow-water approximation #12;2D Water-on-DECK Experiments #12;Water-on-Deck Scenarios-NS results #12;PDB Water-on-Deck: Initial stages Full scale versus model scale: cavity shape From numerics Hammer-Fist events Plunging-Wave events Marintek (2000) White-Water events #12;3D Model Tests With Fixed

Nørvåg, Kjetil

125

Shakedown Analysis of Road Pavements  

Microsoft Academic Search

Shakedown behaviour of road pavements was investigated in laboratory controlled conditions using the Sydney University Pavement Testing Facility. Wheel loads lower than the shakedown load generated low permanent deformations for a larger number of load cycles in comparison with high permanent deformations for a lower number of load cycles for wheel loads higher than the shakedown load. Computer software was

P. S. Ravindra

126

A three dimensional approach for tracking cracks in bridges using GPR  

NASA Astrophysics Data System (ADS)

Corrosion associated with reinforcing bars is the most significant contributor to bridge deficiencies. The corrosion is usually caused by moisture and chloride ion exposure. The reinforcing bars are attacked by corrosion and yield expansive corrosion products. These oxidation products occupy a larger volume than the original intact steel and internal expansive stresses lead to cracking and debonding. There are some conventional inspection methods for the detection of the reinforcing bar's corrosion but they can be invasive and destructive, often laborious, and lane closure is required and it is difficult or unreliable for any quantification of corrosion. For these reasons, bridge engineers always prefer more to use the ground penetrating radar (GPR) technique. In this work a novel numerical approach for three dimensional tracking and mapping of cracks in the bridge is proposed. The work starts from some interesting results based on the use of the 3D imaging technique in order to improve the potentiality of the GPR to detect voids, cracks or buried objects. The numerical approach has been tested on data acquired on a bridge by using a pulse GPR system specifically designed for bridge deck and pavement inspection. The equipment integrates two arrays of Ultra Wide Band ground coupled antennas, having a main working frequency of 2 GHz. The two arrays are using antennas arranged with a different polarization. The cracks, associated often to moisture increase and higher values of the dielectric constant, produce a not negligible increase of the signal amplitude. Following this, the algorithm, organized in preprocessing, processing and postprocessing stages, analyzes the signal by comparing the value of the amplitude all over the domain of the radar scan.

Benedetto, Andrea

2013-10-01

127

Summary of Concrete Overlays Existing concrete pavement  

E-print Network

Summary of Concrete Overlays Existing concrete pavement with surface distresses Prepared surface Monolithic pavement with new concrete surface Existing asphalt pavement with surface distresses Milled pavement with asphalt surface distresses Milled and cleaned surface New 2­5 in. (5.1­12.7 cm) bonded

128

Recommended Practice for Accepting New Concrete Pavement  

E-print Network

Recommended Practice for Accepting New Concrete Pavement Surfaces for Tire/Pavement Noise Designation: CPSCP PP 1-11 (rev 3/1/2011) National Concrete Pavement Technology Center 2711 South Loop Drive, Suite 4700 Ames, IA 50010 #12;PP 1-1 CPSCP Recommended Practice for Accepting New Concrete Pavement

129

Life Cycle Assessment of Reclaimed Asphalt Pavement  

E-print Network

Life Cycle Assessment of Reclaimed Asphalt Pavement to Improve Asphalt Pavement Sustainability By-melt old binder on the RAP #12;Life Cycle Assessment (LCA) · #12;Asphalt Pavement Life Cycle Road-filled after use #12;Asphalt Pavement Life Cycle Road Construction Aggregates Additives Bitumen Down- Cycled

Minnesota, University of

130

UNIDENTIFIED CATENARY SUSPENSION BRIDGE WITH TRUSSED OBELISK TOWERS ON STONE ...  

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

UNIDENTIFIED CATENARY SUSPENSION BRIDGE WITH TRUSSED OBELISK TOWERS ON STONE PIERS, SHOWING HOWE PIPE TRUSS RAILING AND TRUSSED DECK BEAMS TYPICAL TO BRIDGES BUILT BY FLINN-MOYER COMPANY. 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

131

23. General views of Moody Bridge, in descending order: 1) ...  

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

23. General views of Moody Bridge, in descending order: 1) the northern approach with a partial 'barrel shot', 2) partial view of southern approach detailing bridge decking, railing and portal bracing, and 3) an elevation view to the northeast showing timber piers and abutment of southern approach. - Moody Bridge, Spanning South Fork Eel River, Garberville, Humboldt County, CA

132

UNIDENTIFIED CATENARY SUSPENSION BRIDGE ON RIVETED METAL PIERS, SHOWING HOWE ...  

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

UNIDENTIFIED CATENARY SUSPENSION BRIDGE ON RIVETED METAL PIERS, SHOWING HOWE PIPE TRUSS RAILING AND TRUSSED DECK BEAMS TYPICAL TO BRIDGES BUILT BY FLINN-MOYER COMPANY. TRIPODAL PIPE TOWERS RESEMBLE CLEAR FORK OF THE BRAZOS SUSPENSION BRIDGE?S TOWERS PRIOR TO ENCASEMENT IN CONCRETE. NOTE COLLAPSED TRUSS IN RIVER. ELEVATION VIEW. - Clear Fork of Brazos River Suspension Bridge, Spanning Clear Fork of Brazos River at County Route 179, Albany, Shackelford County, TX

133

DESIGN OF CONCRETE DECK SLABS Sami Rizkalla 1 and Tarek Hassan 2  

E-print Network

-linear finite element analysis, this paper presents design recommendations for bridge deck slabs reinforced, while a hybrid GFRPlsteel reinforcement was used for the second model. A non-linear finite element model (ISIS Canada), University ofManitoba, Winnipeg, Manitoba, Canada, R3T 5V6 The use of carbon and glass

134

Pavement recycling. Executive summary and report  

SciTech Connect

The Federal Highway Administration (FHWA) initiated Demonstration Project 39 (DP 39) Recycling Asphalt Pavements in June 1976. The project showed that asphalt pavement recycling was a technically viable rehabitation technique, and it was estimated that the use of reclaimed asphalt pavement (RAP) would amount to approximately 15 percent of the total hot-mix asphalt (HMA) production by the mid-1980s. It was expected that most of the asphalt pavement removed would be reused in new pavement construction or overlays.

NONE

1995-10-01

135

Automated pavement crack detection  

E-print Network

of the number and orientation of the edges detected in the windows yields a classification of the crack type. The extent of the cracking is calculated by the total number of cracks found in the pavement section. To my parents. ACKNOWLEDGMENTS I wish... and Unimodal III IMAGE ANALYSIS . . A. Projection Histogram B. Error Analysis on Window Size and Shape Factor 1. Shape Factor 2. Window Size C. Classification Rule 1. Two-Direction Algorithm 2. Four-Direction Algorithm 3. Eight-Direction Algorithm . D...

Rao, Ashok Madhava

2012-06-07

136

Field performance of geosynthetic reinforced pavements over expansive clay subgrades  

E-print Network

Field performance of geosynthetic reinforced pavements over expansive clay subgrades Zornberg, J, The University of Texas, Austin, USA 78712 Keywords: reinforced pavements; expansive soils; geogrids; geotextiles cracks on the pavement structures. Traditionally the problems related to flexible pavements over

Zornberg, Jorge G.

137

PRECONSTRUCTION INVESTIGATION FOR THE REHABILITATION OF A BRIDGE USING INTERNAL FRP TECHNOLOGIES  

Microsoft Academic Search

This paper reports a research project which evaluates the use of Glass Fiber Reinforced Polymer (GFRP) and Carbon FRP (CFRP) materials for bridge construction. The bridge selected for this project is a four-span continuous concrete slab having GFRP bars for top and bottom mats and CFRP reinforcement for internal post-tensioning of the bridge deck. This bridge is located in Rolla,

N. Galati; G. Boschetto; A. Rizzo; A. Nanni; R. Parretti

138

Pervious Pavement System Evaluation- Abstract  

EPA Science Inventory

Porous pavement is a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete pavers as a popular implementation. The pavers themselves are impermeable, but the spaces between the pavers are backfilled with washed, gra...

139

46 CFR 69.109 - Under-deck tonnage.  

Code of Federal Regulations, 2013 CFR

... (1) If the tonnage deck runs in a continuous line from stem to stern, the line of the tonnage deck is the longitudinal line...deck. (2) If the tonnage deck runs at different levels from stem to stern, the line of the tonnage deck is the...

2013-10-01

140

46 CFR 69.109 - Under-deck tonnage.  

Code of Federal Regulations, 2011 CFR

... (1) If the tonnage deck runs in a continuous line from stem to stern, the line of the tonnage deck is the longitudinal line...deck. (2) If the tonnage deck runs at different levels from stem to stern, the line of the tonnage deck is the...

2011-10-01

141

46 CFR 69.109 - Under-deck tonnage.  

Code of Federal Regulations, 2012 CFR

... (1) If the tonnage deck runs in a continuous line from stem to stern, the line of the tonnage deck is the longitudinal line...deck. (2) If the tonnage deck runs at different levels from stem to stern, the line of the tonnage deck is the...

2012-10-01

142

PORTLAND CEMENT CONCRETE PAVEMENT FOR FLEXIBLE OVER RIGID COMPOSITE PAVEMENTS (Tollway)  

E-print Network

PORTLAND CEMENT CONCRETE PAVEMENT FOR FLEXIBLE OVER RIGID COMPOSITE PAVEMENTS (Tollway) Effective portland cement concrete for special applications to composite pavements as shown and described. Developing concrete mix design(s) that meets the performance requirements for the intended pavement; 4

143

Improving a pavement-watering method on the basis1 of pavement surface temperature measurements2  

E-print Network

Improving a pavement-watering method on the basis1 of pavement surface temperature measurements2.hendel@paris.fr)8 Abstract: Pavement-watering has been studied since the 1990's and is currently considered a9 water resource availability problems require that water consumption be optimized. Although11 pavement

Paris-Sud XI, Université de

144

46 CFR 11.403 - Structure of deck officer endorsements.  

Code of Federal Regulations, 2010 CFR

... false Structure of deck officer endorsements. 11.403 Section 11.403 Shipping...AND SEAMEN REQUIREMENTS FOR OFFICER ENDORSEMENTS Professional Requirements for Deck...11.403 Structure of deck officer endorsements. The following diagram...

2010-10-01

145

UNIDENTIFIED CATENARY SUSPENSION BRIDGE WITH TRIPLE PIPE TOWERS, SHOWING HOWE ...  

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

UNIDENTIFIED CATENARY SUSPENSION BRIDGE WITH TRIPLE PIPE TOWERS, SHOWING HOWE PIPE TRUSS RAILING AND TRUSSED DECK BEAMS TYPICAL TO BRIDGES BUILT BY FLINN-MOYER COMPANY. NOTE THAT TOWER PIPES LIE IN ONE PLANE, UNLIKE TRIPODAL ARRANGEMENT AT CLEAR FORK OF THE BRAZOS SUSPENSION BRIDGE. ELEVATION VIEW. - Clear Fork of Brazos River Suspension Bridge, Spanning Clear Fork of Brazos River at County Route 179, Albany, Shackelford County, TX

146

12. DETAIL VIEW OF BRIDGE, SHOWING SPRING LINE OF SPANS ...  

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

12. DETAIL VIEW OF BRIDGE, SHOWING SPRING LINE OF SPANS FROM CROWN OF MID-CHANNEL PIER, PAIRED COLUMNS SUPPORTING DECK, ARCHED WINDOW RAILING, LOOKING WEST-NORTHWEST FROM EUREKA SOUTHERN RAILROAD BRIDGE. CABLES VISIBLE IN BACKGROUND ARE EARTHQUAKE RESTRAINERS RETROFITTED TO 1952 HIGHWAY BRIDGE, WHICH FUNCTIONED AS DESIGNED IN APRIL 1992 TEMBLOR - Van Duzen River Bridge, Spanning Van Duzen River at CA State Highway 101, Alton, Humboldt County, CA

147

Pervious Pavement System Evaluation-Poster  

EPA Science Inventory

Pervious pavement is a low impact development stormwater control. The Environmental Protection Agency's Urban Watershed Management Branch is evaluating interlocking concrete pavingstone pervious pavement systems. The pavingstones themselves are impermeable, but the spaces between...

148

Making "Magic" Sidewalks of Pervious Pavement  

NSDL National Science Digital Library

Students use everyday building materials—sand, pea gravel, cement and water—to create and test pervious pavement. They learn what materials make up a traditional, impervious concrete mix and how pervious pavement mixes differ. Groups are challenged to create their own pervious pavement mixes, experimenting with material ratios to evaluate how infiltration rates change with different mix combinations.

Water Awareness Research and Education (WARE) Research Experience for Teachers (RET),

149

Sustainable Concrete Pavements: A Manual of Practice  

E-print Network

#12;#12;#12;Sustainable Concrete Pavements: A Manual of Practice January 2012 TECHNICAL EDITORS Dr. Peter Taylor, Associate Director National Concrete Pavement Technology Center, Iowa State and Sustainability Group, Applied Pavement Technology) CO-AUTHORS Dr. Tom Van Dam, Principal Engineer, CTLGroup

150

Pavement thickness evaluation using ground penetrating radar  

Microsoft Academic Search

Accurate knowledge of pavement thickness is important information to have both at a network and project level. This information aids in pavement management and design. Much of the time this information is missing, out of date, or unknown for highway sections. Current technologies for determining pavement thickness are core drilling, falling weight deflectometer (FWD), and ground penetrating radar (GPR). Core

Dwayne Arthur Harris

2006-01-01

151

UNIDENTIFIED CATENARY SUSPENSION BRIDGE, SHOWING COMPLETED SINGLE PIPE TOWERS, WOODEN ...  

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

UNIDENTIFIED CATENARY SUSPENSION BRIDGE, SHOWING COMPLETED SINGLE PIPE TOWERS, WOODEN DECK LAID OVER LONGITUDINAL CABLES, AND WIRES READY FOR CABLE SPINNING. NOTE WORKER IN LEFT FOREGROUND STANDING IN ANCHORAGE PIT. BARREL VIEW. - Clear Fork of Brazos River Suspension Bridge, Spanning Clear Fork of Brazos River at County Route 179, Albany, Shackelford County, TX

152

CLEAR FORK OF THE BRAZOS SUSPENSION BRIDGE, CIRCA 1896, SHOWING ...  

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

CLEAR FORK OF THE BRAZOS SUSPENSION BRIDGE, CIRCA 1896, SHOWING INCLINED STAY CABLES EXTENDING FROM TOP OF TOWER TO DECK. 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

153

SIMULATION OF BUFFETING RESPONSE HISTORY FOR LONG SPAN BRIDGES  

Microsoft Academic Search

Based on conventional buffeting theories, a methodology to simulate buffeting response histories for long bridges is presented in the study. On the basis of specific spectra, buffeting loads are simulated as spatially multi-correlated random processes. Self-excited loads are expressed in terms of convolution integrals between bridge deck motion and impulse response functions, in which unknown parameters are identified from wind

Chunhua Liu; Haifan Xiang

154

15. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, ...  

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

15. 'Concrete Bridge Over Salt River, Port Kenyon, Humboldt County, California, A.J. Logan, County Surveyor, H.J. Brunnier, Consulting Engineer, March 7, 1919,' showing general plan, plan of top chord, elevation of main girder, transverse section, plan section at deck level. - Salt River Bridge, Spanning Salt River at Dillon Road, Ferndale, Humboldt County, CA

155

30. VIEW OF BRIDGE, LOOKING NORTH TOWARD THE WALKWAY EAST ...  

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

30. VIEW OF BRIDGE, LOOKING NORTH TOWARD THE WALKWAY EAST ABUTMENT. THE HORIZONTAL CABLES RUN FROM THE ABUTMENT TO THE QUARTER POINT OF THE WALKWAY DECK. February 1987 - Verde River Sheep Bridge, Spanning Verde River (Tonto National Forest), Cave Creek, Maricopa County, AZ

156

Development of Pavement Temperature Contours for India  

NASA Astrophysics Data System (ADS)

The stress-strain response of the bituminous pavements is highly sensitive to temperature. To systematically analyze the pavement performance, it is necessary that one understands the variation of pavement temperature spatially and temporally during the life time of a pavement. In this investigation, historic air temperature data for 37 locations across India was collected. Using this database, pavement temperature data was predicted by an appropriate air temperature-pavement temperature model. High and low temperature pavement temperature contours were generated for the first time for India. It was seen that the locations spanning from Srinagar to Madhya Pradesh and Rajasthan to Orissa were extremely critical. The minimum temperature in these locations was 10 C and the maximum temperature was around 68 C. Clearly such information is necessary when making choice of binder grade and bituminous layer thickness.

Nivitha, M. R.; Krishnan, J. M.

2014-06-01

157

Guide Specification for Highway Construction Texturing Concrete Pavement for  

E-print Network

Guide Specification for Highway Construction Texturing Concrete Pavement for Reduced Tire/Pavement Noise using Diamond Grinding Designation: CPSCP GS 1-11 (rev 3/1/2011) National Concrete Pavement for Highway Construction Texturing Concrete Pavement for Reduced Tire/Pavement Noise using Diamond Grinding

158

BEHAVIOUR OF CONCRETE BRIDGE DECK MODEL REINFORCED BY CARBON FRP  

E-print Network

. Serviceability of the slab. strain distribution and performance of optical fibre sensors attached to CFRP different boundary conditions. Optical fibre sensors were used to monitor the strain of the CFRP reinforcement in conjunction with conventional electrical strain gauges. Analj1ical model was carried out using

159

Artificial intelligence applied to bridge deck radar interpretation  

Microsoft Academic Search

The use of ground probing radar for the nondestructive evaluation of structures has been in use for more than a decade. Through the examination of the subsurface reflection waveforms, determinations may be made regarding the profile geometry as well as detecting the presence of structural faults undetectable from surface inspections. Although automated systems have been previously created, the arduous task

Darel Edward Mesher

1992-01-01

160

46 CFR 69.111 - Between-deck tonnage.  

Code of Federal Regulations, 2011 CFR

...If the uppermost complete deck runs in a continuous line from stem to stern, the line of the uppermost complete deck is the longitudinal...If the uppermost complete deck runs at different levels from stem to stern, the line of the uppermost complete deck is...

2011-10-01

161

46 CFR 69.111 - Between-deck tonnage.  

Code of Federal Regulations, 2010 CFR

...If the uppermost complete deck runs in a continuous line from stem to stern, the line of the uppermost complete deck is the longitudinal...If the uppermost complete deck runs at different levels from stem to stern, the line of the uppermost complete deck is...

2010-10-01

162

46 CFR 69.111 - Between-deck tonnage.  

Code of Federal Regulations, 2013 CFR

...If the uppermost complete deck runs in a continuous line from stem to stern, the line of the uppermost complete deck is the longitudinal...If the uppermost complete deck runs at different levels from stem to stern, the line of the uppermost complete deck is...

2013-10-01

163

Two-decked nature of the Ouachita Mountains, Arkansas  

Microsoft Academic Search

The Ouachita Mountains of Arkansas and Oklahoma are made up of two structural decks. The lower deck of tight to isoclinal folds in pre-Middle Mississippian strata records multiple folding and low-grade metamorphism. The upper deck of open folds in Carboniferous rocks shows no evidence of the multiple folding and metamorphism. Dips of fold limbs in the lower deck are typically

Abdolali Babaei; George W. Viele

1992-01-01

164

INTRODUCTION Pavement preservation is an approach in enhancing pavement performance using a set of practices that extends the life  

E-print Network

INTRODUCTION Pavement preservation is an approach in enhancing pavement performance using a set of practices that extends the life of the pavement and improves safety and ride quality. According to theWorld Bank's Pavement Deterioration Model, the cost of returning a pavement to good condition after

Stephens, Jacqueline

165

Pavement Smoothness for Illinois DOT -Doug Dirks 1. Briefly summarize your current pavement smoothness requirements. See below.  

E-print Network

Pavement Smoothness for Illinois DOT - Doug Dirks 1. Briefly summarize your current pavement? N/A Illinois has both standard specifications and a special provision for pavement smoothness-Depth HMA pavements, and PCC Pavements are all included in this special provision. http

166

Numerical Studies on the Seismic Retrofit of Bridges Using Shape Memory Alloys  

NASA Astrophysics Data System (ADS)

Recent earthquakes have highlighted the seismic vulnerability of bridges due to excessive movements at the joints (in simply supported deck bridges) or concentration of seismic forces in a few piers (in multi-span continuous deck bridges). Steel-based seismic restrainers and viscous shock transmitters are used to limit the joint openings in simply supported deck bridges or to redistribute the seismic force among all piers in continuous deck bridges, respectively. Currently used devices, however, have some limitations such as large dimensions, no energy dissipation, possible large residual displacements, bad control of the force transmitted to the substructure (steel restrainers), large dimensions, difficulty of installation in existing structures, need of maintenance, and sensitivity to the earthquake characteristics (viscous shock transmitters). Shape memory alloys (SMAs) with superelastic behavior show the potential to overcome the limitations involved in the current technologies. In this article, a multi-performance seismic device based on superelastic SMA wires is proposed for the seismic retrofit of multi-span simply supported and continuous deck bridges. The effectiveness of the SMA devices is assessed through a number of nonlinear time-history analyses on two bridge structures representative of existing Italian highway bridges. Results are compared to the seismic response of the bridges in the as-built configuration.

Cardone, Donatello; Perrone, Giuseppe; Sofia, Salvatore

2011-07-01

167

Pavement Design TTP Orientation Seminar  

E-print Network

­Maintenance ­Rehabilitation ­Reconstruction (Abandonment? Reuse?) · Goal at all stages is greater efficiency, Traffic Considerations, ReDesign 2010-2050 Sustainability Materials ReUse, Vehicle/Pavement Interaction;Traffic Variables Highways - it's the trucks · Loads · Tire pressures · Speeds · Dynamics (interaction

Handy, Susan L.

168

Pavement Design TTP Orientation Seminar  

E-print Network

? Reuse?) · Goal at all stages is greater efficiency ­how is efficiency defined? #12;Where Are We Now Materials ReUse, Vehicle/Pavement Interaction, New Materials, Information Technology Integration #12;Is Variables Highways - it's the trucks · Loads · Tire pressures · Speeds · Dynamics (interaction

Handy, Susan L.

169

Pavement Design TTP Orientation Seminar  

E-print Network

(Abandonment? Reuse?) · Goal at all stages is greater efficiency ­ how is efficiency defined? #12;Where Are We-2050 Sustainability Materials ReUse, Vehicle/Pavement Interaction, New Materials, Information Technology Integration the "good old" days? #12;Traffic Variables Highways - it's the trucks · Loads · Tire pressures · Speeds

Handy, Susan L.

170

Review of permeable pavement systems  

Microsoft Academic Search

The purpose of this review paper is to summarise the wide-range but diffuse literature on predominantly permeable pavement systems (PPS), highlight current trends in research and industry, and to recommend future areas of research and development. The development of PPS as an integral part of sustainable drainage systems is reviewed in the context of traditional and modern urban drainage. Particular

Miklas Scholz; Piotr Grabowiecki

2007-01-01

171

Global warming potential of pavements  

Microsoft Academic Search

Pavements comprise an essential and vast infrastructure system supporting our transportation network, yet their impact on the environment is largely unquantified. Previous life-cycle assessments have only included a limited number of the applicable life-cycle components in their analysis. This research expands the current view to include eight different components: materials extraction and production, transportation, onsite equipment, traffic delay, carbonation, lighting,

Nicholas J. Santero; Arpad Horvath

2009-01-01

172

Smart Suspension Systems for Bridge-Friendly Vehicles Yonghong Chena1  

E-print Network

, the use of tuned mass damper [3] and magneto-rheological fluid damper [4, 5] has been examined as means, Deck irregularities, Magnetorheological (MR) damper 1. INTRODUCTION Highway bridges have suffered

Tsao, Tsu-Chin

173

Application of the Grillage Methodology to Determine Load Distribution Factors for Spread Slab Beam Bridges  

E-print Network

Transverse load distribution behavior amongst bridge girders is influenced by many parameters including girder material properties, spacing, skew, deck design, and stiffening element interactions. In order to simply and conservatively approximate...

Petersen-Gauthier, Joel

2013-08-09

174

Outdoor Math 2000: Pricing a Deck  

NSDL National Science Digital Library

In this activity, students Read a diagram and determine the minimum cost of each of the three deck designs, using prices and information about lumber from a chart. Then they apply the Pythagoreum theorum to calculate nonstandard shapes.

2010-01-01

175

Definition of the 2005 flight deck environment  

NASA Technical Reports Server (NTRS)

A detailed description of the functional requirements necessary to complete any normal commercial flight or to handle any plausible abnormal situation is provided. This analysis is enhanced with an examination of possible future developments and constraints in the areas of air traffic organization and flight deck technologies (including new devices and procedures) which may influence the design of 2005 flight decks. This study includes a discussion on the importance of a systematic approach to identifying and solving flight deck information management issues, and a description of how the present work can be utilized as part of this approach. While the intent of this study was to investigate issues surrounding information management in 2005-era supersonic commercial transports, this document may be applicable to any research endeavor related to future flight deck system design in either supersonic or subsonic airplane development.

Alter, K. W.; Regal, D. M.

1992-01-01

176

The Collapse of the I-35W Bridge in Minneapolis  

NASA Astrophysics Data System (ADS)

On Wednesday, Aug. 1, 2007, at 6:05 p.m. (during evening rush hour), the I-35W bridge across the Mississippi River in Minneapolis collapsed, killing 13 people and injuring 145. At the time of the collapse, repair work was in progress on the deck of the bridge, resulting in an additional 287 tons of construction material and equipment being on the bridge deck. This paper will present an analysis of a simple but similar bridge structure, using only Newton's second law. This analysis can give some insights into the cause of the collapse. This paper is the third of a series on bridge collapses, the first two being on the Tacoma Narrows Bridge and the Nimitz Freeway.2

Feldman, Bernard J.

2010-11-01

177

Bituminous pavement recycling Aravind K. and Animesh Das  

E-print Network

Bituminous pavement recycling Aravind K. and Animesh Das Department of Civil Engineering IIT Kanpur Introduction The bituminous pavement rehabilitation alternatives are mainly overlaying, recycling and reconstruction. In the recycling process the material from deteriorated pavement, known as reclaimed asphalt

Das, Animesh

178

Pervious Pavement A Strategic Plan For NYC DOT  

E-print Network

Pervious Pavement A Strategic Plan For NYC DOT Presented By: Rene Brana Spring 2012 Capstone: Pervious Pavement - A Strategic Plan for NYC DOT 2 Capstone: Pervious Pavement - A Strategic Plan for NYC DOT 3 Image courtesy of

Qian, Ning

179

The Collapse of the I-35W Bridge in Minneapolis  

Microsoft Academic Search

On Wednesday, Aug. 1, 2007, at 6:05 p.m. (during evening rush hour), the I-35W bridge across the Mississippi River in Minneapolis collapsed, killing 13 people and injuring 145. At the time of the collapse, repair work was in progress on the deck of the bridge, resulting in an additional 287 tons of construction material and equipment being on the bridge

Bernard J. Feldman

2010-01-01

180

Removable Urban Pavements: An innovative, sustainable technology Journal: International Journal of Pavement Engineering  

E-print Network

1 Removable Urban Pavements: An innovative, sustainable technology Journal: International Journal of Pavement Engineering URL: http://mc.manuscriptcentral.com/gpav E-mail: IJPE.editor@citg.tudelft.nl, alqadi@uiuc.edu Removable Urban Pavements: An innovative, sustainable technology François de Larrard1, Thierry Sedran2, Jean

Paris-Sud XI, Université de

181

Compaction of asphalt pavement. Final report  

SciTech Connect

This synthesis will be of interest to construction and materials engineers, paving contractors, equipment manufacturers, and others who are involved in assessing the performance of asphalt pavements. Information is presented on various issues related to compaction of asphalt pavements. Compaction is one of the most important factors affecting the performance of asphalt pavements. The report of the Transportation Research Board describes the theory, methods, equipment, and specifications related to the compaction of asphalt pavements. A brief history of, the importance of, and factors affecting compaction are also discussed. Construction influences, density measurements, and trends are also considered.

Hughes, C.S.

1989-10-01

182

Calculations in bridge aeroelasticity via CFD  

SciTech Connect

The central focus of the present study is the numerical calculation of flutter derivatives. These aeroelastic coefficients play an important role in determining the stability or instability of long, flexible structures under ambient wind loading. A class of Civil Engineering structures most susceptible to such an instability are long-span bridges of the cable-stayed or suspended-span variety. The disastrous collapse of the Tacoma Narrows suspension bridge in the recent past, due to a flutter instability, has been a big impetus in motivating studies in flutter of bridge decks.

Brar, P.S.; Raul, R.; Scanlan, R.H. [Johns Hopkins Univ., Baltimore, MD (United States)

1996-12-31

183

Two-decked nature of the Ouachita Mountains, Arkansas  

NASA Astrophysics Data System (ADS)

The Ouachita Mountains of Arkansas and Oklahoma are made up of two structural decks. The lower deck of tight to isoclinal folds in pre-Middle Mississippian strata records multiple folding and low-grade metamorphism. The upper deck of open folds in Carboniferous rocks shows no evidence of the multiple folding and metamorphism. Dips of fold limbs in the lower deck are typically more than 60°; dips of fold limbs in the upper deck are generally less than 45°; fold wavelengths in the lower deck are in the range of 0.5 to 3.5 km; fold wavelengths in the upper deck are generally in the range of 12 to 15 km. Estimates of shortening of the folds in the lower deck are five times greater than those of shortening of the upper deck. The change from tight folding to broad folding takes place in the middle part of the Mississippian Stanley Group. The difference in fold style has been attributed to disharmonic folding of a stiff upper deck and a ductile lower deck. However, the boundary between harmonic and disharmonic folds shows no apparent relation to the fold wavelength or the stratigraphic spacing of stiff beds. We hypothesize that the difference in structural style reflects the unconformable deposition of younger folded and faulted foreland-basin strata (the upper deck) over the older lower deck strata, which were stacked in an accretionary wedge.

Babaei, Abdolali; Viele, George W.

1992-11-01

184

Example of application of response history analysis for seismically isolated curved bridges on drilled shaft with springs representing soil  

Microsoft Academic Search

The main objective of this study is to perform a parametrical study associated with the effects of the earthquake ground motions on the seismic response of isolated curved bridges including soil–structure interaction.For the isolated bridge system, double concave friction pendulum bearings are placed between the deck and the piers, the abutments as isolation devices. A curved bridge is selected to

Sevket Ates; Michael C. Constantinou

2011-01-01

185

Highway pavement distress evaluation: Modeling measurement error  

Microsoft Academic Search

There has been a proliferation of inspection technologies to quantify distresses on highway pavement systems. These technologies employ varying measurement principles and are subject to measurement errors. Estimates of measurement errors are therefore required in order to select among these techniques, and to get accurate assessments of pavement condition. There is abundant literature concerning techniques available for the numerical study

Frannie Humplick

1992-01-01

186

Fractionation of heavy metals in pavement runoff  

Microsoft Academic Search

Abstract The transport of anthropogenic constituents by runoff from urban roadways can adversely impact the quality of adjacent receiving waters and soils. Metal elements are the most,persistent constituents found in pavement,runoff. A section of urban highway pavement in Cincinnati, Ohio, USA with an average daily traffic count of 150 000 vehicles was instrumented to sample lateral sheet flow from the

John J. Sansalone; Steven G. Buchberger; Souhail R. Al-abed

1996-01-01

187

Analysis and design optimization of flexible pavement  

SciTech Connect

A project-level optimization approach was developed to minimize total pavement cost within an analysis period. Using this approach, the designer is able to select the optimum initial pavement thickness, overlay thickness, and overlay timing. The model in this approach is capable of predicting both pavement performance and condition in terms of roughness, fatigue cracking, and rutting. The developed model combines the American Association of State Highway and Transportation Officials (AASHTO) design procedure and the mechanistic multilayer elastic solution. The Optimization for Pavement Analysis (OPA) computer program was developed using the prescribed approach. The OPA program incorporates the AASHTO equations, the multilayer elastic system ELSYM5 model, and the nonlinear dynamic programming optimization technique. The program is PC-based and can run in either a Windows 3.1 or a Windows 95 environment. Using the OPA program, a typical pavement section was analyzed under different traffic volumes and material properties. The optimum design strategy that produces the minimum total pavement cost in each case was determined. The initial construction cost, overlay cost, highway user cost, and total pavement cost were also calculated. The methodology developed during this research should lead to more cost-effective pavements for agencies adopting the recommended analysis methods.

Mamlouk, M.S.; Zaniewski, J.P.; He, W.

2000-04-01

188

Pervious Pavement System Evaluation-Paper  

EPA Science Inventory

The use of a pervious pavement can be effective as a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete paver systems as a type of porous pavement. Although the pavers are impermeable, the spaces between the pave...

189

SORPTIVITY-BASED SERVICE LIFE PREDICTIONS FOR CONCRETE PAVEMENTS  

E-print Network

SORPTIVITY-BASED SERVICE LIFE PREDICTIONS FOR CONCRETE PAVEMENTS by Dale P. Bentz, Mark A. Ehlen Pavements. Proceedings, Volume 1. International Society for Concrete Pavements. September 9-13, 2001 Pavements ­ Orlando, Florida, USA ­ September 9-13, 2001. 181 SORPTIVITY-BASED SERVICE LIFE PREDICTIONS

Bentz, Dale P.

190

RESEARCH Open Access Pavement crack characteristic detection based  

E-print Network

RESEARCH Open Access Pavement crack characteristic detection based on sparse representation Xiaoming Sun1 , Jianping Huang1 , Wanyu Liu1* and Mantao Xu2 Abstract Pavement crack detection plays an important role in pavement maintaining and management. The three- dimensional (3D) pavement crack detection

Joensuu, University of

191

CHECKLIST FOR INSPECTION OF POROUS PAVEMENTS Location: Inspector  

E-print Network

CHECKLIST FOR INSPECTION OF POROUS PAVEMENTS Location: Inspector: Date: Time: Site Conditions: Date minimum, Spring & Fall) Clean porous pavement to remove sediment and organic debris on the pavement surface via vacuum street sweeper. S U Adjacent non porous pavement vacuumed S U Clean catch basins (if

192

New Developments in the Debate on Pavement-Vehicle  

E-print Network

New Developments in the Debate on Pavement-Vehicle Interaction: The Impact of Pavement Design aerodynamics Improve energy efficiency Reduce rolling resistance, including pavement-vehicle interaction #12 standards for big trucks" February 18, 2014 What about fuel efficiency standards for pavements? #12;Slide 5

de Weck, Olivier L.

193

TEXAS PAVEMENT PRESERVATION CENTER FOUR-YEAR SUMMARY REPORT  

E-print Network

TEXAS PAVEMENT PRESERVATION CENTER FOUR-YEAR SUMMARY REPORT Dr. Yetkin Yildirim, P.E., TPPC Director E-mail: yetkin@mail.utexas.edu Mailing address: Texas Pavement Preservation Center Center................................................................................................ 100 #12;#12;TEXAS PAVEMENT PRESERVATION CENTER (TPPC) About the Center The Texas Pavement Preservation

Texas at Austin, University of

194

Pavement performance modelling with an auto-regression approach  

Microsoft Academic Search

In this paper, an auto-regression method is applied to pavement performance modelling to improve the predictive accuracy of predictions when there are only limited or incomplete data available. Using age and past measured conditions as independent variables, the average trend within a pavement group is captured by a ‘global’ function shared by all pavements, while any pavement-specific effects are reflected

Z. Luo

2011-01-01

195

2. ROSS POWERHOUSE: TRANSFORMER DECK, TAILRACE, AND BOATHOUSE AS SEEN ...  

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

2. ROSS POWERHOUSE: TRANSFORMER DECK, TAILRACE, AND BOATHOUSE AS SEEN FROM EAST END OF TRANSFORMER DECK, 1989. - Skagit Power Development, Ross Powerhouse, On Skagit River, 10.7 miles upstream from Newhalem, Newhalem, Whatcom County, WA

196

Improving Rutting Resistance of Pavement Structures Using Geosynthetics: An Overview  

PubMed Central

A pavement structure consists of several layers for the primary purpose of transmitting and distributing traffic loads to the subgrade. Rutting is one form of pavement distresses that may influence the performance of road pavements. Geosynthetics is one type of synthetic materials utilized for improving the performance of pavements against rutting. Various studies have been conducted on using different geosynthetic materials in pavement structures by different researchers. One of the practices is a reinforcing material in asphalt pavements. This paper intends to present and discuss the discoveries from some of the studies on utilizing geosynthetics in flexible pavements as reinforcement against permanent deformation (rutting). PMID:24526919

Karim, Mohamed Rehan; Khodaii, Ali; Almasi, Mohammad Hadi

2014-01-01

197

Improving rutting resistance of pavement structures using geosynthetics: an overview.  

PubMed

A pavement structure consists of several layers for the primary purpose of transmitting and distributing traffic loads to the subgrade. Rutting is one form of pavement distresses that may influence the performance of road pavements. Geosynthetics is one type of synthetic materials utilized for improving the performance of pavements against rutting. Various studies have been conducted on using different geosynthetic materials in pavement structures by different researchers. One of the practices is a reinforcing material in asphalt pavements. This paper intends to present and discuss the discoveries from some of the studies on utilizing geosynthetics in flexible pavements as reinforcement against permanent deformation (rutting). PMID:24526919

Mirzapour Mounes, Sina; Karim, Mohamed Rehan; Khodaii, Ali; Almasi, Mohammad Hadi

2014-01-01

198

Effects of temperature and water on pavement performance  

SciTech Connect

The 12 papers in the report deal with the following areas: procedures for estimation of asphalt-concrete pavement moduli at in-situ temperatures; stress caused by temperature gradient in portland-cement concrete pavements; characterizing temperature effects for pavement analysis and design; temperature response of concrete pavements; an examination of environmental versus load effects on pavements; moisture in portland-cement concrete; effect of rainfall on the performance of continuously reinforced concrete pavements in Texas; effect of moisture on the structural performance of a crushed-limestone road base; water-induced distress in flexible pavement in a wet tropical climate; an evaluation of design high-water clearances for pavements; economic impact of pavement subsurface drainage; use of open-graded, free-draining layers in pavement systems; a national synthesis report.

Badu-Tweneboah, K.; Tia, M.; Ruth, B.E.; Richardson, J.M.; Armaghani, J.M.

1987-01-01

199

Rapid-to-deploy wireless monitoring systems for static and dynamic load testing of bridges: validation on the Grove Street Bridge  

NASA Astrophysics Data System (ADS)

Bridge management officials have expressed a keen interest in the use of low-cost and easy-to-install wireless sensors to record bridge responses during short-term load testing. To illustrate the suitability of wireless sensors for short-term monitoring of highway bridges, a wireless monitoring system is installed upon the Grove Street Bridge to monitor structural responses during static and dynamic load testing. Specifically, load testing of the Grove Street Bridge is conducted after its construction to validate the behavior of a novel jointless bridge deck constructed from a high-performance fiber reinforced cementitious composite (HPFRCC) material. A heterogeneous array of sensing transducers are installed in the bridge including metal foil strain gages, accelerometers and linear variable differential transducers (LVDTs). First, the acceleration response of the bridge is monitored by the wireless system during routine traffic loading. Modal parameters (modal frequencies and mode shapes) are calculated by the wireless sensors so that an analytical model of the bridge constructed in a standard commercial finite element package can be updated off-line. Next, the bridge is closed to traffic and trucks of known weight are parked on the bridge to induce static deformations. The installation strategy of the wireless monitoring system during static load testing is optimized to monitor the strain and rotation response of the HPFRCC deck. The measured static response of the deck is compared to that predicted by the updated analytical model.

Hou, Tsung-Chin; Lynch, Jerome P.

2006-03-01

200

Road Materials and Pavements Design. Volume X No X/2009, pages 1 to 16 Pavement Design for Curved Road Sections  

E-print Network

Road Materials and Pavements Design. Volume X ­ No X/2009, pages 1 to 16 Pavement Design for Curved pavements Christophe Petit* -- Malick Diakhaté* -- Anne Millien* -- Annabelle Phelipot-Mardelé* -- Bertrand@eurovia.com ABSTRACT. This paper focuses on damage processes other than the main one observed and studied in pavement

Paris-Sud XI, Université de

201

An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2  

E-print Network

An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2.hendel@paris.fr)8 9 Preprint version. Uploaded on May 12th , 2014.10 Abstract: Pavement-watering as a technique rarely been conducted. We propose an15 analysis of pavement heat flux at a depth of 5 cm and solar

Paris-Sud XI, Université de

202

29 CFR 1918.36 - Weather deck rails.  

...2014-07-01 2014-07-01 false Weather deck rails. 1918.36 Section 1918.36 Labor Regulations... Working Surfaces § 1918.36 Weather deck rails. Removable weather deck rails shall be kept in place except when cargo...

2014-07-01

203

46 CFR 108.487 - Helicopter deck fueling operations.  

...operations. (a) Each helicopter landing deck on which fueling...rotor area of the largest helicopter for which the deck is designed...locations, be protected from icing and freezing, and be capable...to cover any point on the helicopter deck. Each hose that...

2014-10-01

204

A Comparative Study of Numerical Methods for Fluid-Structure Interaction Analysis in Long-Span Bridge Design  

Microsoft Academic Search

Both a Finite Volume and a Discrete Vortex technique to solve the unsteady Navier-Stokes equations have been employed to study the air flow around long-span bridge decks. The implementation and calibration of both methods is described alongside a quasi-3D extension added to the DVM solver. Applications to the wind engineering of bridge decks include flow simulations at different angles of

G. Morgenthal; F. A. McRobie

205

Bridge permeameter  

DOEpatents

A system for single-phase, steady-state permeability measurements of porous rock utilizes a fluid bridge arrangement analogous to a Wheatstone bridge. The arms of the bridge contain the sample and calibrated flow resistors.

Graf, Darin C. (Edgewood, NM); Warpinski, Norman R. (Albuquerque, NM)

1996-01-01

206

Deck Tennis, Physical Education: 5551.28.  

ERIC Educational Resources Information Center

This course outline is a guide for teaching the principles and skills of deck tennis in grades 7-12. The course format includes discussions, practice of fundamental skills, participation in game situations and class tournaments, and subjective and objective evaluations. Course content includes the following: (a) history, (b) description of game,…

King, Katheryn

207

Aviation Safety Program Integrated Intelligent Flight Deck  

E-print Network

increasing concern is how to maintain, or improve, safety as aircraft and aircraft systems become undeniably in many instances. In other words, an aircraft and/or system design that optimizes safetyAviation Safety Program Integrated Intelligent Flight Deck Technical Plan Summary Principal

208

On Deck with the Scarlett Isabella  

USGS Multimedia Gallery

A view from the deck of the Scarlett Isabella.  The USGS returned from a seafloor data mapping mission offshore of the Delmarva Peninsula (Ocean City, MD) on July 25th, 2014. The data collected is foundational to our continued understanding of coastal change, vulnerabilities, and making our co...

209

Human factors issues of flight deck automation  

Microsoft Academic Search

It is widely acknowledged that commercial transport aircraft automation has improved the economy of airliners, and that accident rates for advanced technology commercial aircraft are lower than those of comparable conventional technology aircraft. Nevertheless, criticism of the human factors of modern flight deck automation is common among pilots and other aviation professionals (e.g., Billings, 1997). Until recently, though, there was

Ken Funk; Beth Lyall

1998-01-01

210

33 CFR 155.790 - Deck lighting.  

Code of Federal Regulations, 2011 CFR

...plane 3 feet above the deck the illumination must measure at least: (1) 5.0 foot candles at transfer connection points; and (2) 1.0 foot candle in transfer operations work areas. (c) Lighting must be located or shielded so...

2011-07-01

211

33 CFR 155.790 - Deck lighting.  

Code of Federal Regulations, 2012 CFR

...plane 3 feet above the deck the illumination must measure at least: (1) 5.0 foot candles at transfer connection points; and (2) 1.0 foot candle in transfer operations work areas. (c) Lighting must be located or shielded so...

2012-07-01

212

33 CFR 155.790 - Deck lighting.  

Code of Federal Regulations, 2010 CFR

...plane 3 feet above the deck the illumination must measure at least: (1) 5.0 foot candles at transfer connection points; and (2) 1.0 foot candle in transfer operations work areas. (c) Lighting must be located or shielded so...

2010-07-01

213

33 CFR 155.790 - Deck lighting.  

...plane 3 feet above the deck the illumination must measure at least: (1) 5.0 foot candles at transfer connection points; and (2) 1.0 foot candle in transfer operations work areas. (c) Lighting must be located or shielded so...

2014-07-01

214

33 CFR 155.790 - Deck lighting.  

Code of Federal Regulations, 2013 CFR

...plane 3 feet above the deck the illumination must measure at least: (1) 5.0 foot candles at transfer connection points; and (2) 1.0 foot candle in transfer operations work areas. (c) Lighting must be located or shielded so...

2013-07-01

215

Pilot Fullerton sleeps on aft flight deck  

NASA Technical Reports Server (NTRS)

Pilot Fullerton, wearing communication kit assembly (assy) mini headset (HDST), sleeps on aft flight deck resting his back against the floor and his feet against Commanders ejection seat (S1) seat back. Onorbit Station control panel A8 and Payload Station panel L15 appear above Fullerton. Special clips for holding notebooks open and beverage containers are velcroed on various panels.

1982-01-01

216

I-5/Gilman advanced technology bridge project  

NASA Astrophysics Data System (ADS)

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

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

2000-04-01

217

Pavement crack detection based on texture feature  

NASA Astrophysics Data System (ADS)

A novel automatic pavement crack detection approach based on texture feature is proposed. The bidirectional multi-level median filter is applied in pretreatment process to eliminate noise while maintain the details of crack edge. Improved center-symmetric local binary pattern (ICS-LBP) texture feature, local correlation texture feature and relative standard deviation texture feature are combined to detect the pavement cracks. Trained-decision strategy is applied to allocate each weight of features and texture features are extracted to train the weights. Experimental results show that the proposed algorithm provides better detection result in comparison with various crack extraction algorithms, and can detect the pavement crack quickly and effectively.

Zhang, Xiuhua; Chen, Yanjun; Hong, Hanyu

2011-11-01

218

Noise from Aft Deck Exhaust Nozzles Differences in Experimental Embodiments  

NASA Technical Reports Server (NTRS)

Two embodiments of a rectangular nozzle on an aft deck are compared. In one embodiment the lower lip of the nozzle was extended with the sidewalls becoming triangles. In a second embodiment a rectangular nozzle was fitted with a surface that fit flush to the lower lip and extended outward from the sides of the nozzle, approximating a semi-infinite plane. For the purpose of scale-model testing, making the aft deck an integral part of the nozzle is possible for relatively short deck lengths, but a separate plate model is more flexible, accounts for the expanse of deck to the sides of the nozzle, and allows the nozzle to stand off from the deck. Both embodiments were tested and acoustic far-field results were compared. In both embodiments the extended deck introduces a new noise source, but the amplitude of the new source was dependent upon the span (cross-stream dimension) of the aft deck. The noise increased with deck length (streamwise dimension), and in the case of the beveled nozzle it increased with increasing aspect ratio. In previous studies of slot jets in wings it was noted that the increased noise from the extended aft deck appears as a dipole at the aft deck trailing edge, an acoustic source type with different dependence on velocity than jet mixing noise. The extraneous noise produced by the aft deck in the present studies also shows this behavior both in directivity and in velocity scaling.

Bridges, James E.

2014-01-01

219

PROGRESSIVE COLLAPSE OF STEEL TRUSS BRIDGES, THE CASE OF I-35W COLLAPSE  

Microsoft Academic Search

Steel deck truss bridges, being determinate systems and not having redundancy, can progressively collapse over the entire span, if a single primary member or gusset plate connection of the main trusses fails. One of the recent tragic examples of such progressive collapse of the entire bridge due to loss of a single gusset plate is the case of I-35W steel

Abolhassan Astaneh-Asla

220

SOIL\\/STRUCTURE INTERACTION OF INTEGRAL BRIDGE WITH FULL HEIGHT ABUTMENTS  

Microsoft Academic Search

The behaviour of integral bridges with full height abutments is dominated by the cyclical ( daily and seasonal) temperature changes in the bridge deck and the resulting imposition of cyclical horizontal displacements to the backfill soil of the abutments. It is known that the lateral earth pressures over the back of the abutments escalate to valu es considerably in excess

Neil C. M. Tsang; George L. England; Treve Dunstan

221

Advances in Modeling of Aerodynamic Forces on Bridge Xinzhong Chen1  

E-print Network

Advances in Modeling of Aerodynamic Forces on Bridge Decks Xinzhong Chen1 and Ahsan Kareem2 Abstract: Aerodynamic forces on bridges are commonly separated into static, self-excited, and buffeting in modeling aerodynamic forces. Formulations for airfoil sections and those based on quasi- steady theory

Chen, Xinzhong

222

CFRP strengthening of a railway concrete trough bridge – a case study  

Microsoft Academic Search

This paper presents an upgrading and monitoring of a Swedish concrete railway bridge. The methods used for the upgrading as well as for the monitoring are innovative and new. Carbon fibre tubes are inserted in holes in the bridge deck, drilled in the transverse direction of the slab at a location ca. 40 mm from the top. Carbon fibre NSMR bars

Anders Bennitz; Björn Täljsten; Georg Danielsson

2010-01-01

223

ACOUSTIC EMISSION HEALTH MONITORING OF STEEL BRIDGES Pooria L. Pahlavan1  

E-print Network

;initiation and growth of fatigue cracks at the root of the welded connections at the intersections in the field of Acoustic Emission (AE) for monitoring fatigue cracks in steel structures, the implementation bridges, fatigue cracks. INTRODUCTION In steel bridges, growth of fatigue cracks in the deck plate

Boyer, Edmond

224

Improvements to a Transport Model of Asphalt Binder Oxidation in Pavements: Pavement Temperature Modeling, Oxygen Diffusivity in Asphalt Binders and Mastics, and Pavement Air Void Characterization  

E-print Network

Although evidence is mounting that asphalt binder oxidizes in pavements, and that oxidation and subsequent hardening of asphalt binder has a profound effect on pavement durability, important implementation issues remain to be better understood...

Han, Rongbin

2012-07-16

225

Straw Bridges  

NSDL National Science Digital Library

Learners design, build and test a model bridge out of straws. The bridge must span 25 cm across a gap between two tables or two chairs. To measure the load, the bridge must securely hold a small cup. Learners test the load by placing as many pennies in the cup as possible and counting how many the bridge can hold.

Museum of Science and Industry, Chicago

2012-01-01

226

PCC Pavement Sustainability in New York Economy, Environment, and Society: 2 Out of 3 is Easy  

E-print Network

PCC Pavement Sustainability in New York Economy, Environment, and Society: 2 Out of 3 is Easy Bill PCC pavement sustainability strategy. NYSDOT recognizes that PCC pavements have "sustainable efforts, begging the question, "Is any pavement truly "sustainable?"" 1. PCC pavements, and pavement

227

The Collapse of the I-35W Bridge in Minneapolis  

ERIC Educational Resources Information Center

On Wednesday, Aug. 1, 2007, at 6:05 p.m. (during evening rush hour), the I-35W bridge across the Mississippi River in Minneapolis collapsed, killing 13 people and injuring 145. At the time of the collapse, repair work was in progress on the deck of the bridge, resulting in an additional 287 tons of construction material and equipment being on the…

Feldman, Bernard J.

2010-01-01

228

Permeable Pavement Research - Edison, New Jersey  

EPA Science Inventory

This presentation provides the background and summary of results collected at the permeable pavement parking lot monitored at the EPA facility in Edison, NJ. This parking lot is surfaced with permeable interlocking concrete pavers (PICP), pervious concrete, and porous asphalt. ...

229

Pervious Pavement System Evaluation- Abstract 1  

EPA Science Inventory

Porous pavement is a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete pavers as a popular implementation. The pavers themselves are impermeable, but the spaces between the pavers are backfilled with washed, gra...

230

Incorporating inspection decisions in pavement management  

Microsoft Academic Search

Pavement management systems need to address not only maintenance and rehabilitation (M&R) decisions, but also facility inspection decisions. The state of the art in pavement management is lacking of any consistent methodology for making such decisions on a cost-effectiveness basis. Such a methodology must recognize the presence of interactions between M&R and inspection decisions. These interactions argue for a joint

Samer Madanat

1993-01-01

231

Automatic inspection of pavement cracking distress  

Microsoft Academic Search

We present an image processing algorithm customized for high-speed, real-time inspection of pavement cracking. In the algorithm, a pavement image is divided into grid cells of 8×8 pixels, and each cell is classified as a noncrack or crack cell using the grayscale information of the border pixels. Whether a crack cell can be regarded as a basic element (or seed)

Yaxiong Huang; Bugao Xu

2006-01-01

232

Fusing complementary images for pavement cracking measurements  

NASA Astrophysics Data System (ADS)

Cracking is a major pavement distress that jeopardizes road serviceability and traffic safety. Automated pavement distress survey (APDS) systems have been developed using digital imaging technology to replace human surveys for more timely and accurate inspections. Most APDS systems require special lighting devices to illuminate pavements and prevent shadows of roadside objects that distort cracks in the image. Most artificial lighting devices are laser based, and are either hazardous to unprotected people or require dedicated power supplies on the vehicle. This study was aimed to develop a new imaging system that can scan pavement surface at highway speed and determine the level of severity of pavement cracking without using any artificial lighting. The new system consists of dual line-scan cameras that are installed side by side to scan the same pavement area as the vehicle moves. Cameras are controlled with different exposure settings so that both sunlit and shadowed areas can be visible in two separate images. The paired images contain complementary details useful for reconstructing an image in which the shadows are eliminated. This paper intends to present (1) the design of the dual line-scan camera system, (2) a new calibration method for line-scan cameras to rectify and register paired images, (3) a customized image-fusion algorithm that merges the multi-exposure images into one shadow-free image for crack detection, and (4) the results of the field tests on a selected road over a long period.

Yao, Ming; Zhao, Zuyun; Yao, Xun; Xu, Bugao

2015-02-01

233

Thermal stability analysis under embankment with asphalt pavement and cement pavement in permafrost regions.  

PubMed

The permafrost degradation is the fundamental cause generating embankment diseases and pavement diseases in permafrost region while the permafrost degradation is related with temperature. Based on the field monitoring results of ground temperature along G214 Highway in high temperature permafrost regions, both the ground temperatures in superficial layer and the annual average temperatures under the embankment were discussed, respectively, for concrete pavements and asphalt pavements. The maximum depth of temperature field under the embankment for concrete pavements and asphalt pavements was also studied by using the finite element method. The results of numerical analysis indicate that there were remarkable seasonal differences of the ground temperatures in superficial layer between asphalt pavement and concrete pavement. The maximum influencing depth of temperature field under the permafrost embankment for every pavement was under the depth of 8?m. The thawed cores under both embankments have close relation with the maximum thawed depth, the embankment height, and the service time. The effective measurements will be proposed to keep the thermal stabilities of highway embankment by the results. PMID:24027444

Junwei, Zhang; Jinping, Li; Xiaojuan, Quan

2013-01-01

234

Thermal Stability Analysis under Embankment with Asphalt Pavement and Cement Pavement in Permafrost Regions  

PubMed Central

The permafrost degradation is the fundamental cause generating embankment diseases and pavement diseases in permafrost region while the permafrost degradation is related with temperature. Based on the field monitoring results of ground temperature along G214 Highway in high temperature permafrost regions, both the ground temperatures in superficial layer and the annual average temperatures under the embankment were discussed, respectively, for concrete pavements and asphalt pavements. The maximum depth of temperature field under the embankment for concrete pavements and asphalt pavements was also studied by using the finite element method. The results of numerical analysis indicate that there were remarkable seasonal differences of the ground temperatures in superficial layer between asphalt pavement and concrete pavement. The maximum influencing depth of temperature field under the permafrost embankment for every pavement was under the depth of 8?m. The thawed cores under both embankments have close relation with the maximum thawed depth, the embankment height, and the service time. The effective measurements will be proposed to keep the thermal stabilities of highway embankment by the results. PMID:24027444

Jinping, Li; Xiaojuan, Quan

2013-01-01

235

POROUS PAVEMENT. PHASE I. DESIGN AND OPERATIONAL CRITERIA  

EPA Science Inventory

Design and operational criteria, utilization concepts, benefits and disadvantages, as well as other characteristics of porous pavements are presented in this report. Particular emphasis is placed on porous asphalt pavements, but the criteria and design approach are applicable to ...

236

Molecular mechanisms controlling pavement cell shape in Arabidopsis leaves  

Microsoft Academic Search

Pavement cells have an interlocking jigsaw puzzle-shaped leaf surface pattern. Twenty-three genes involved in the pavement\\u000a cell morphogenesis were discovered until now. The mutations of these genes through various means lead to pavement cell shape\\u000a defects, such as loss or lack of interdigitation, the reduction of lobing, gaps between lobe and neck regions in pavement\\u000a cells, and distorted trichomes. These

Pingping Qian; Suiwen Hou; Guangqin Guo

2009-01-01

237

Using the Multi-Depth Deflectometer to study pavement response  

E-print Network

the structural condition of existing pavements. In this study, the Multi-Depth Deflectometer (MDD) is used to measure the pavement response to dynamic loads. The NDD is installed inside a pavement to measure deflections of selected points in pavement layers... deflections. Thus, two procedures were available to backcalculate layer moduli from deflection data. The first was from surface deflections and the second was from depth deflections. A third procedure developed for backcalculation of layer moduli using...

Yazdani, Jamshed Iqbal

1989-01-01

238

Surface Distresses Detection of Pavement Based on Digital Image Processing  

Microsoft Academic Search

\\u000a Pavement crack is the main form of early diseases of pavement. The use of digital photography to record pavement images and\\u000a subsequent crack detection and classification has undergone continuous improvements over the past decade. Digital image processing\\u000a has been applied to detect the pavement crack for its advantages of large amount of information and automatic detection. The\\u000a applications of digital

Aiguo Ouyang; Chagen Luo; Chao Zhou

2010-01-01

239

Development on preventive maintenance management system for expressway asphalt pavements  

Microsoft Academic Search

In view of the status that there was no expressway pavement preventive maintenance management system at home and abroad at present, based on the technology theory obtained by the author and the demands and process of expressway asphalt pavement preventive maintenance management, preventive maintenance management system for expressway asphalt pavement (EPMMS (V1.0)) was developed. The work or functions of expressway

Hu Guoxiang; Li Jie

2010-01-01

240

PARTIAL-DEPTH REPAIR OF CONCRETE PAVEMENTSCONCRETE PAVEMENTS  

E-print Network

April 2012 PARTIAL-DEPTH REPAIR OF CONCRETE PAVEMENTSCONCRETE PAVEMENTS GUIDE FOR #12;#12;Guide for Partial-Depth Repair of Concrete Pavements i Technical Report Documentation Page 1. Report No. 2 Depth Repair of Concrete Pavements April 2012 6. Performing Organization Code 7. Author(s) 8. Performing

241

COMPOSITE PORTLAND CEMENT CONCRETE PAVEMENTS (Tollway) Effective: January 30, 2012  

E-print Network

COMPOSITE PORTLAND CEMENT CONCRETE PAVEMENTS (Tollway) Effective: January 30, 2012 Revised: May 8 for special applications to composite pavements as shown and described on the Drawings and in this Special(s) that meets the performance requirements for the intended pavement; 4. Constructing a trial section

242

Roads to Development: Experimental Evidence from Urban Road Pavement  

E-print Network

Roads to Development: Experimental Evidence from Urban Road Pavement Marco Gonzalez-Navarro UC peripheries in many developing country cities lack basic local public goods like pavement, water, sewerage pavement provision in Mexico. Our findings show that homes in streets that were paved increased their value

Silver, Whendee

243

Regular Inspection and Maintenance Guidance for Porous Pavements  

E-print Network

Regular Inspection and Maintenance Guidance for Porous Pavements Regular inspection and maintenance is critical to the effective operation of porous pavement. It is the responsibility of the owner to maintain the pavement in accordance with the minimum design standards. This page provides guidance on maintenance

244

PAVEMENT OVERLAY THICKNESS EVALUATION USING GROUND PENTRATING RADAR (GPR)  

E-print Network

PAVEMENT OVERLAY THICKNESS EVALUATION USING GROUND PENTRATING RADAR (GPR) Dwayne Harris, M.Sc., PG University, West Lafayette, IN 47907 jshan@ecn.purdue.edu ABSTRACT Accurate knowledge of pavement thickness is important information to have both at a network and project level. This information aids in pavement

Shan, Jie

245

Impact of Curing Methods on Curling of Concrete Pavements  

E-print Network

Impact of Curing Methods on Curling of Concrete Pavements Amir Hajibabaee Travis Ebisch Tyler Ley is Curling? Curling is when the edges of a concrete pavement (or slab) deflect up compared to the middle. Warping is the same thing only the edges deflect downward. curling warping #12;Why do pavements curl

246

MANUAL FOR WEB-BASED TXDOT RIGID PAVEMENT Sureel Saraf  

E-print Network

0-5445-P2 MANUAL FOR WEB-BASED TXDOT RIGID PAVEMENT DATABASE Authors: Sureel Saraf Moon Won TxDOT Project 0-5445: Project Level Performance Database for Rigid Pavements in Texas SEPTEMBER 2007, REV. JULY-Based Information System for Rigid Pavements User's Manual Texas Department of Transportation July 9, 2009 #12

Texas at Austin, University of

247

Cosmogenic 3 He surface-exposure dating of stone pavements  

E-print Network

Cosmogenic 3 He surface-exposure dating of stone pavements: Implications for landscape evolution Mexico 87545 Chad T. Olinger ABSTRACT The formation of stone pavements, a ubiquitous gravel armor at the land surface in a time-transgressive manner. A newly proposed model for pavement evolution differs from

Ahmad, Sajjad

248

Integrated Materials and Construction Practices (IMCP) for Concrete Pavement  

E-print Network

Integrated Materials and Construction Practices (IMCP) for Concrete Pavement Workshop Participant Handbook Prepared for Prepared by Federal Highway Administration National Concrete Pavement Technology Center Office of Pavement Technology at Iowa State University 400 7th Street AW 2711 South Loop Drive

249

Porous Pavement in Cold Climates Part: Performance and Cost  

E-print Network

Porous Pavement in Cold Climates Part: Performance and Cost Onondaga Environmental Institute 17 #12;Overview 1. Hydrology of Permeable Pavements 2. Water Quality Performance 3. Hydraulic Performance However, a large number of installations STILL continue to be sub-standard 4 #12;Porous Pavement Design

250

Fast Error Estimates For Indirect Measurements: Applications To Pavement Engineering  

E-print Network

Fast Error Estimates For Indirect Measurements: Applications To Pavement Engineering Carlos that is difficult to measure directly (e.g., lifetime of a pavement, efficiency of an engine, etc). To estimate y computation time. As an example of this methodology, we give pavement lifetime estimates. This work

Kreinovich, Vladik

251

Structural design of pavements with stabilized layers Animesh Das  

E-print Network

Structural design of pavements with stabilized layers Animesh Das Associate Professor, Department@iitk.ac.in The talk will primarily be divided in three parts, namely analysis of pavement structure, empirical design and composite pavements will be mentioned. The governing equations and the boundary conditions will be discussed

Das, Animesh

252

OVERLAYSSustainable Solutions for Resurfacing and Rehabilitating Existing Pavements THIRD EDITION  

E-print Network

Pavements May 2014 THIRD EDITION ACPA publicationTB021.03P #12;On the Cover source:Todd Hanson, Iowa DOT and Rehabilitating Existing Pavements (3rd edition) May 2014 6. Performing Organization Code 7. Author(s) 8 10. Work Unit No. (TRAIS) National Concrete Pavement Technology Center Institute for Transportation

253

Graded Viscoelastic Approach for Modeling Asphalt Concrete Pavements  

E-print Network

Graded Viscoelastic Approach for Modeling Asphalt Concrete Pavements Eshan V. Dave'', William G of Illinois at Urb ana-Champaign Abstract. Asphalt concrete pavements exhibit severely graded properties viscoelastic model has been implemented within a numerical framework for the simulation of asphalt pavement

Paulino, Glaucio H.

254

Asphalt Pavement Aging and Temperature Dependent Properties through a Functionally  

E-print Network

Asphalt Pavement Aging and Temperature Dependent Properties through a Functionally Graded ­ II ­ Asphalt Pavements ­ Effect of Aging ­ Simulations ­ Concluding Remarks #12;3 Objectives Develop) Correspondence Principle based formulation Application: Asphalt concrete pavements (Part II) #12;4 Asphalt

Paulino, Glaucio H.

255

Asphalt Pavement Aging and Temperature Dependent Properties through a Functionally  

E-print Network

Asphalt Pavement Aging and Temperature Dependent Properties through a Functionally Graded ­ Verification ­ Concluding Remarks Part ­ II (Companion presentation) ­ Asphalt Pavements ­ Effect of Aging: Asphalt concrete pavements (Part II) E1 E2 E3 Eh 1 2 3 h #12;Graded Finite Elements Graded Elements

Paulino, Glaucio H.

256

RESEARCH REPORT 1250-1 EFFECT OF RECLAIMED ASPHALT PAVEMENT  

E-print Network

RESEARCH REPORT 1250-1 EFFECT OF RECLAIMED ASPHALT PAVEMENT ON BINDER PROPERTIES USING. Report Date September 1998 4. Title and Subtitle EFFECT OF RECLAIMED ASPHALT PAVEMENT ON BINDER with the Federal Highway Administration. 16. Abstract While the use of reclaimed asphalt pavement (RAP) in asphalt

Texas at Austin, University of

257

Application of Graded Finite Elements for Asphalt Pavements  

E-print Network

Application of Graded Finite Elements for Asphalt Pavements William G. Buttlar1 ; Glaucio H. Paulino2 ; and Seong Hyeok Song3 Abstract: Asphalt paving layers, particularly the surface course, exhibit: Fractures; Asphalt pavements; Finite element method; Material properties. Introduction Modern pavement

Paulino, Glaucio H.

258

Popsicle Bridge  

NSDL National Science Digital Library

In this activity, learners explore how engineering has impacted the development of bridges over time, including innovative designs and the challenge of creating bridges that become landmarks for a city. Learners work in teams of "engineers" to design and build their own bridge out of glue and popsicle sticks. Learners test their bridges using weights, evaluate their results, and present their findings to the group.

Ieee

2013-08-30

259

Pavement Sealcoat, PAHs, and the Environment  

NASA Astrophysics Data System (ADS)

Recent research by the USGS has identified coal-tar-based pavement sealants as a major source of polycyclic aromatic hydrocarbons (PAHs) to the environment. Coal-tar-based sealcoat is commonly used to coat parking lots and driveways and is typically is 20-35 percent coal tar pitch, a known human carcinogen. Several PAHs are suspected mutagens, carcinogens, and (or) teratogens. In the central and eastern U.S. where the coal-tar-based sealants dominate use, sum-PAH concentration in dust particles from sealcoated pavement is about 1,000 times higher than in the western U.S. where the asphalt-based formulation is prevalent. Source apportionment modeling indicates that particles from sealcoated pavement are contributing the majority of the PAHs to recent lake sediment in 35 U.S. urban lakes and are the primary cause of upward trends in PAHs in many of these lakes. Mobile particles from parking lots with coal-tar-based sealcoat are tracked indoors, resulting in elevated PAH concentrations in house dust. In a recently completed study, volatilization fluxes of PAHs from sealcoated pavement were estimated to be about 60 times fluxes from unsealed pavement. Using a wide variety of methods, the author and colleagues have shown that coal-tar-based sealcoat is a major source of PAHs to the urban environment and might pose risks to aquatic life and human health.

Van Metre, P. C.; Mahler, B. J.

2011-12-01

260

Spaghetti Bridge  

NSDL National Science Digital Library

Civil engineers design structures such as buildings, dams, highways and bridges. Student teams explore the field of engineering by making bridges using spaghetti as their primary building material. Then they test their bridges to see how much weight they can carry before breaking.

K-12 Outreach Office,

261

Bridge permeameter  

DOEpatents

A system is described for single-phase, steady-state permeability measurements of porous rock which utilizes a fluid bridge arrangement analogous to a Wheatstone bridge. The arms of the bridge contain the sample and calibrated flow resistors. 8 figs.

Graf, D.C.; Warpinski, N.R.

1996-08-13

262

Spaghetti Bridge  

NSDL National Science Digital Library

In this engineering activity, learners investigate the differences between the strength of bridges made from flat and round building materials. They construct simple bridges out of linguine, which has a rectangular shape, and spaghetti, which has a circular shape. They then test and compare the weight capacity of the bridges.

Cosi

2009-01-01

263

Designing Bridges  

NSDL National Science Digital Library

Students learn about the types of possible loads, how to calculate ultimate load combinations, and investigate the different sizes for the beams (girders) and columns (piers) of simple bridge design. Students learn the steps that engineers use to design bridges: understanding the problem, determining the potential bridge loads, calculating the highest possible load, and calculating the amount of material needed to resist the loads.

Integrated Teaching And Learning Program And Laboratory

264

46 CFR 28.410 - Deck rails, lifelines, storm rails, and hand grabs.  

...Deck rails, lifelines, storm rails, and hand grabs. 28.410 Section 28.410...Deck rails, lifelines, storm rails, and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2014-10-01

265

46 CFR 28.410 - Deck rails, lifelines, storm rails, and hand grabs.  

Code of Federal Regulations, 2013 CFR

...Deck rails, lifelines, storm rails, and hand grabs. 28.410 Section 28.410...Deck rails, lifelines, storm rails, and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2013-10-01

266

46 CFR 28.410 - Deck rails, lifelines, storm rails, and hand grabs.  

Code of Federal Regulations, 2012 CFR

...Deck rails, lifelines, storm rails, and hand grabs. 28.410 Section 28.410...Deck rails, lifelines, storm rails, and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2012-10-01

267

46 CFR 28.410 - Deck rails, lifelines, storm rails, and hand grabs.  

Code of Federal Regulations, 2010 CFR

...Deck rails, lifelines, storm rails, and hand grabs. 28.410 Section 28.410...Deck rails, lifelines, storm rails, and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2010-10-01

268

46 CFR 28.810 - Deck rails, lifelines, storm rails and hand grabs.  

...Deck rails, lifelines, storm rails and hand grabs. 28.810 Section 28.810...Deck rails, lifelines, storm rails and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2014-10-01

269

46 CFR 28.810 - Deck rails, lifelines, storm rails and hand grabs.  

Code of Federal Regulations, 2011 CFR

...Deck rails, lifelines, storm rails and hand grabs. 28.810 Section 28.810...Deck rails, lifelines, storm rails and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2011-10-01

270

46 CFR 28.410 - Deck rails, lifelines, storm rails, and hand grabs.  

Code of Federal Regulations, 2011 CFR

...Deck rails, lifelines, storm rails, and hand grabs. 28.410 Section 28.410...Deck rails, lifelines, storm rails, and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2011-10-01

271

46 CFR 28.810 - Deck rails, lifelines, storm rails and hand grabs.  

Code of Federal Regulations, 2013 CFR

...Deck rails, lifelines, storm rails and hand grabs. 28.810 Section 28.810...Deck rails, lifelines, storm rails and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2013-10-01

272

46 CFR 28.810 - Deck rails, lifelines, storm rails and hand grabs.  

Code of Federal Regulations, 2010 CFR

...Deck rails, lifelines, storm rails and hand grabs. 28.810 Section 28.810...Deck rails, lifelines, storm rails and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2010-10-01

273

46 CFR 28.810 - Deck rails, lifelines, storm rails and hand grabs.  

Code of Federal Regulations, 2012 CFR

...Deck rails, lifelines, storm rails and hand grabs. 28.810 Section 28.810...Deck rails, lifelines, storm rails and hand grabs. (a) Except as otherwise...limitations make deck rails impractical, hand grabs may be substituted. (b)...

2012-10-01

274

Performance of continuously reinforced concrete pavements: Volume 6 -- CRC pavement design, construction, and performance. Final report, August 1990--December 1994  

SciTech Connect

This report is one of a series of reports prepared as part of a recent study sponsored by the Federal Highway Administration (FHWA) aimed at updating the state-of-the-art of the design, construction, maintenance, and rehabilitation of continuous reinforced concrete (CRC) pavements. The scope of work of the FHWA study included the following: (1) Conduct of a literature review and preparation of an annotated bibliography on CRC pavements and CRC overlays. (2) Conduct of a field investigation and laboratory testing related to 23 existing in-service pavement sections. This was done to evaluate the effect of various design features on CRC pavement performance, to identify any design or construction related problems, and to recommend procedures to improve CRC pavement technology. (3) Evaluation of the effectiveness of various maintenance and rehabilitation strategies for CRC pavements. (4) Preparation of a Summary Report on the current state of the practice for CRC pavements. Each of the above four items is addressed in a separate report. The following reports have been prepared under this study: Performance of CRC Pavements. Volume 1: Summary of Practice and Annotated Bibliography. Volume 2: Field Investigation of CRC Pavements. Volume 3: Analysis and Evaluation of Field Test Data. Volume 4: Resurfacing for CRC Pavements. Volume 5: Maintenance and Repair of CRC Pavements. Volume 6: CRC Pavement Design, Construction, and Performance. Volume 7: Summary. This report is Volume 6 in the series.

Zollinger, D.G.; Buch, N.; Xin, D.; Soares, J.

1999-02-01

275

Spills on Flat Inclined Pavements  

SciTech Connect

This report describes the general spill phenomenology for liquid spills occurring on relatively impermeable surfaces such as concrete or asphalt pavement and the development and application of a model to describe the time evolution of such spills. The discussion assumes evaporation and degradation are negligible and a homogeneous surface. In such an instance, the inherent interfacial properties determine the spatial extent of liquid spreading with the initial flow being controlled by the release rate of the spill and by the liquids resistance to flow as characterized by its viscosity. A variety of spill scenarios were simulated and successful implementation of the model was achieved. A linear relationship between spill area and spill volume was confirmed. The simulations showed spill rate had little effect on the final spill area. Slope had an insignificant effect on the final spill area, but did modify spill shape considerably. However, a fluid sink on the edge of the simulation domain, representing a storm drain, resulted in a substantial decrease in spill area. A bona fide effort to determine the accuracy of the model and its calculations remain, but comparison against observations from a simple experiment showed the model to correctly determine the spill area and general shape under the conditions considered. Further model verification in the form of comparison against small scale spill experiments are needed to confirm the models validity.

Simmons, Carver S.; Keller, Jason M.; Hylden, Jeff L.

2004-03-01

276

Breaking/cracking and seating concrete pavements. Final report  

SciTech Connect

This synthesis will be of interest to pavement designers, maintenance engineers, and others interested in reducing reflection cracking of asphalt overlays on portland cement concrete (PCC) pavement. Information is presented on the technique of breaking or cracking of the concrete pavement into small segments before overlaying with asphalt concrete. Asphalt concrete overlays on existing PCC pavements are subject to reflection cracking induced by thermal movements of PCC pavement. The report of the Transportation Research Board discusses the technique of breaking/cracking and seating of the existing PCC before an overlay as a means to reduce or eliminate reflection cracking.

Thompson, M.R.

1989-03-01

277

30. View of main deck at bow (looking aft from ...  

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

30. View of main deck at bow (looking aft from samson post, upper deck removed), showing anchor windlass (left foreground), head (right foregound), and forward deckhouse; weather canopy overhead not an original or permanent feature - Schooner WAWONA, 1018 Valley Street, Seattle, King County, WA

278

27. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK ...  

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

27. VIEW LOOKING AFT ON STARBOARD SIDE OF MAIN DECK WITH TENDER ANNIE RUTH ALONGSIDE. COVER OF FORWARD COMPANIONWAY HAS BEEN PLACED ON MAIN DECK; SUN AWNING A TYPICAL FEATURE IN TROPICAL CLIMATES. CREW MEMBERS UNKNOWN Original 4-3/4'x6-3/4' photograph taken c. 1930? - Pilot Schooner "Alabama", Moored in harbor at Vineyard Haven, Vineyard Haven, Dukes County, MA

279

46 CFR 28.565 - Water on deck.  

Code of Federal Regulations, 2011 CFR

(b) Except for a vessel that operates on protected waters, the residual righting energy, “b” in Figure 28.565, must not be less than the water on deck heeling energy, “a” in Figure 28.565. (c) The water on deck heeling energy must be determined assuming the...

2011-10-01

280

Calvert Cliffs RELAP5/MOD3/SCDAP plant deck  

SciTech Connect

This report documents the development of a RELAP5/MOD3/SCDAP input deck for the Calvert Cliffs nuclear power plant. Through the addition of SCDAP inputs, NPA interactive capabilities, and significant nodalization enhancements the range of applicability; of this input deck has been greatly increased.

Hendrix, C.E.; Determan, J.C.

1992-12-01

281

46 CFR 28.565 - Water on deck.  

Code of Federal Regulations, 2010 CFR

...FOR COMMERCIAL FISHING INDUSTRY VESSELS Stability § 28.565 Water on deck. ...trim and displacement are constant and equal to the values of the vessel without the...energy from the value where the righting arm equals the water on deck heeling arm up to...

2010-10-01

282

Elevator Group Supervisory Control of Double-Deck and  

E-print Network

1 Elevator Group Supervisory Control of Double-Deck and Multi-Car Elevator Systems using Genetic Control Systems EGSCS 1970 Artificial Intelligence AI) Double-Deck Elevator Systems DDES Multi Network Programming YU, Lu 7 #12;2 Genetic Algorithm GA Genetic Programming GP Elevator Group Supervisory

Fernandez, Thomas

283

Ph.D. Final Defense: NONLINEAR WAVE LOADS ON DECKS  

E-print Network

Ph.D. Final Defense: NONLINEAR WAVE LOADS ON DECKS OF COASTAL STRUCTURES Masoud Hayatdavoodi-dimensional nonlinear wave loads on a horizontal deck of a coastal structure located in water of finite depth. Two of the nonlinear loads to the environmental and design conditions will be discussed. POST 723 Thursday, November 21

Frandsen, Jannette B.

284

Crewmember working on the mid deck Zeolite Crystal Growth experiment.  

NASA Technical Reports Server (NTRS)

View showing Payload Specialist Bonnie Dunbar, in the mid deck, conducting the Zeolite Crystal Growth (ZCG) Experiment in the mid deck stowage locker work area. View shows assembly of zeolite sample in the metal autoclave cylinders prior to insertion into the furnace.

1992-01-01

285

Astronaut Ellen Ochoa at RMS controls on aft flight deck  

NASA Technical Reports Server (NTRS)

Astronaut Ellen Ochoa, payload commander, on the Space Shuttle Atlantis' aft flight deck, has just completed an operations at the controls for the Remote Manipulator System (RMS) arm while working in chorus with astronaut Donald R. McMonagle. McMonagle, mission commander, is seen here at his station on the forward flight deck. An RMS operations checklist floats in front of Ochoa.

1994-01-01

286

Chip Seals for Asphalt Concrete Pavements: A Proposed Emulsion Residue Specification and Existing Pavement Texture Evaluation  

E-print Network

seal emulsion must be applied. In this project, existing pavement macrotextures were measured at three chip seal projects immediately before construction using both the sand patch test and the circular track meter, CT Meter. The CT Meter was found...

Hoyt, Denise

2012-07-16

287

DETERIORATION FORECASTING IN FLEXIBLE PAVEMENTS DUE TO FLOODS AND SNOW STORMS  

E-print Network

DETERIORATION FORECASTING IN FLEXIBLE PAVEMENTS DUE TO FLOODS AND SNOW STORMS Salar Shahini.birken@neu.edu, 4 mi.wang@neu.edu ABSTRACT Roadway agencies and state DOTs utilize Pavement Management Systems (PMS process of pavements is an integral part of any Pavement Management System. As pavement condition grows

Boyer, Edmond

288

[ ]April 2013 Thickness is currently a pay item for portland cement concrete (PCC) pavements  

E-print Network

) pavements and a quality control item for both PCC and hot mix asphalt (HMA) pavements. A change in pavement are performed by destructively coring the finished pavement and measuring the thickness of the core are collected for each lot. Today, multiple non- destructive pavement evaluation tools are available

Harms, Kyle E.

289

6. DETAIL VIEW AT ROAD LEVEL, SHOWING STEELDECK GRATING AND ...  

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

6. DETAIL VIEW AT ROAD LEVEL, SHOWING STEEL-DECK GRATING AND JUNCTURE OF ARCH AND PAVEMENT - Benson Street Concrete Bowstring Bridge, Spanning Mill Creek at Benson Street, Lockland, Hamilton County, OH

290

Spaghetti Bridge  

NSDL National Science Digital Library

Learners explore the field of civil engineering by making a bridge using spaghetti as their primary building material. Then they test their bridges to see how much weight they can carry before breaking. This activity allows learners to engage in the entire engineering process as they design, build, test, then discuss their bridges. Resource includes investigating questions to extend learning. Time estimated for activity can be split across multiple meetings.

Institute, Worcester P.

2013-01-01

291

Experimental pavement using household waste slag  

SciTech Connect

Municipal wastes used to be simply landfilled, but because of increasing difficulty in finding disposal sites, it became common practice to incinerate wastes and landfill the ash. In view of rapidly dwindling landfill sites, the author thought that the landfill site problem might be solved by finding a way to utilize slag made from incinerator ash. In this paper, a method for utilizing water-granulated slag as an asphalt pavement material is discussed. On the basis of laboratory test results, trial paving using base course materials consisting of crushed stone and 25 or 50% slag was carried out, paying attention primarily to bearing capacity. Marshall tests and fatigue resistance tests were conducted to determine the optimum content of water-granulated slag, and it was concluded that quality comparable to that of conventional asphalt concrete was attained at the slag content of 25% or less and that no problem would arise if the slag content was kept at 60% or less of the fine aggregate content. The mix proportions thus determined were also tested through experimental paving. A follow-up study to evaluate the durability of the experimental pavements confirmed that the experimental pavements were comparable in performance with conventional asphalt concrete pavements. This paper also reports on some problems encountered that need to be solved before utilizing water-granulated slag.

Kouda, Masahiro [Nippon Hodo Co., Ltd., Kasugai, Aichi (Japan). Nagoya Research Inst.] [Nippon Hodo Co., Ltd., Kasugai, Aichi (Japan). Nagoya Research Inst.

1996-12-31

292

Desert pavement study at Amboy, California  

NASA Technical Reports Server (NTRS)

Desert pavement is a general term describing a surface that typically consists of a thin layer of cm-sized rock fragments set on top of a layer of finer material in which no fragments are found. An understanding of desert pavement is important to planetary geology because they may play a major role in the formation and visibility of various aeolian features such as wind streaks, which are important on Mars and may be important on Venus. A field study was conducted in Amboy, California to determine the formation mechanism of desert pavements. The probable sequence of events for the formation and evolution of a typical desert pavement surface, based on this experiment and the work of others, is as follows. Starting with a layer of surface material consisting of both fine particles and rock fragments, aeolian deflation will rapidly erode the surface until an armored lag is developed, after which aeolian processes become less important. The concentration of fragments then slowly increases as new fragments are brought to the surface from the subsurface and as fragments move downslope by sheet wash. Sheet wash would be responsible for removing very fine particles from the surface and for moving the fragments relative to one another, forming interlocks.

Williams, S.; Greeley, R.

1984-01-01

293

Asphalt Oxidation Kinetics and Pavement Oxidation Modeling  

E-print Network

not considered in the model such as the effect of small aggregate particles on oxygen diffusion. Carbonyl area and viscosity of binders recovered from field cores of three pavements in Texas were measured and were used for model calibration and validation...

Jin, Xin

2012-07-16

294

A Prototype Roof Deck Designed to Self-Regulate Deck Temperature and Reduce Heat Transfer  

SciTech Connect

A prototype roof and attic assembly exploits the use of radiation, convection and insulation controls to reduce the heat transfer penetrating its roof deck by almost 85% of the heat transfer crossing a conventional roof and attic assembly. The assembly exhibited attic air temperatures that did not exceed the peak day outdoor ambient temperature. The design includes a passive ventilation scheme that pulls air from the soffit and attic into an inclined air space above the deck. The design complies with fire protection codes because the air intake is internal and closed to the elements. Field data were benchmarked against an attic computer tool and simulations made for new and retrofit home constructions in hot, moderate and cold climates to access economics for the assembly.

Miller, William A [ORNL] [ORNL

2011-01-01

295

Orbiter Flight Deck Redesign (A Physical Layout for a Futuristic Flight Deck)  

NASA Technical Reports Server (NTRS)

The purpose of this summer project was to develop a set of schematic drawings for redesign of the Space Shuttle flight deck from which three dimensional computer drawings can be built and viewed in a virtual environment. In order to achieve this goal, first recommendations for overall redesign of Space Shuttle previously made by experts in the field were reviewed and relevant information was extracted and delineated. Original drawings of the Space Shuttle made by Rockwell were obtained and carefully examined. In order to implement and assess any modifications in terms of space saving parameters, it was determined that the drawings alone could not achieve this objective. As a complement, physical measurements of the mockup of Space Shuttle flight deck were made and the information was categorized and properly labeled on the original drawings. Then, spacesaving redesign ideas, as motivated by expert recommendations on such things as information display panel upgrade by technologically advanced flat display units, were implemented. Next, the redesign ideas were executed on the Forward flight deck, Overhead Console, Right and Left Console, and Center Console. A new 3-D computer drawing of this was developed by modifying the existing drawing on the in-house developed software (PLAID). Finally, the drawing was transported to a Virtual Environment and observed.

Khorsandi, Mehrzad

1996-01-01

296

Simplified Solution for Periodic Thermal Discontinuities in Asphalt Overlays Bonded to Rigid Pavements  

E-print Network

Simplified Solution for Periodic Thermal Discontinuities in Asphalt Overlays Bonded to Rigid discontinuities distributed in a hot mix asphalt overlay bonded to a rigid pavement, where the length Database subject headings: Thermal stresses; Fracture mechanics; Asphalt pavements; Rigid pavements

Paulino, Glaucio H.

297

Level II scour analysis for Bridge 28 (BRNATH00660028) on Town Highway 66, crossing Locust Creek, Barnard, Vermont  

USGS Publications Warehouse

The Town Highway 66 crossing of the Locust Creek is a 41-ft-long, one-lane bridge consisting of a 39 ft steel stringer type bridge with a concrete deck (Vermont Agency of Transportation, written communication, August 24, 1994). The clear span is 36.8 ft. The bridge is supported by vertical, concrete abutments with wingwalls. The upstream right wingwall is protected by stone fill. The channel is skewed approximately 10 degrees to the opening while the open

Severence, Timothy

1997-01-01

298

Interior view of the Flight Deck looking forward, the Commander's ...  

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

Interior view of the Flight Deck looking forward, the Commander's seat and controls are on the left and the pilot's seat and controls are on the right of the view. Note that the flight deck windows have protective covers over them in this view. This images can be digitally stitched with image HAER No. TX-116-A-20 to expand the view to include the overhead control panels of the flight deck. This view was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

299

Straw Bridges  

NSDL National Science Digital Library

Working as engineering teams, students design and create model beam bridges using plastic drinking straws and tape as their construction materials. Their goal is to build the strongest bridge with a truss pattern of their own design, while meeting the design criteria and constraints. They experiment with different geometric shapes and determine how shapes affect the strength of materials. Let the competition begin!

Integrated Teaching And Learning Program

300

Permeable pavement is a system that allows rainwater and runoff to move through the pavement's porous surface to a storage layer below.  

E-print Network

Permeable pavement is a system that allows rainwater and runoff to move through the pavement. It has been shown by decades of scientific research that permeable pavements reduce runoff volumes. Research has also shown that the stormwater that flows through the layers of a permeable pavement system

Goodman, Robert M.

301

Thermal cracking of rubber modified pavements, May 1995. Final report  

SciTech Connect

In accordance with the original ISTEA mandate (1991) to use crumb tire rubber in pavements, Alaska would be required to use about 250 tons of used tire rubber starting in 1994 and increasing to about 1,000 tons of rubber in 1997 and each year thereafter. A number of pavements using crumb rubber modifiers have been built in the state and have been in service for periods of 8 to 15 years. Knowledge of the behavior of these rubber-modified pavements under extreme climate conditions, particularly in relation to their low temperature cracking resistance, is necessary for future design and construction of rubberized pavements in Alaska. This report presents results of a study to determine the low temperature cracking resistance of rubber modified pavements in Alaska in comparison with conventional asphalt concrete pavements.

Raad, L.; Yuan, X.; Saboundjian, S.

1995-05-01

302

MODELING PAVEMENT DETERIORATION PROCESSES BY POISSON HIDDEN MARKOV MODELS  

NASA Astrophysics Data System (ADS)

In pavement management, it is important to estimate lifecycle cost, which is composed of the expenses for repairing local damages, including potholes, and repairing and rehabilitating the surface and base layers of pavements, including overlays. In this study, a model is produced under the assumption that the deterioration process of pavement is a complex one that includes local damages, which occur frequently, and the deterioration of the surface and base layers of pavement, which progresses slowly. The variation in pavement soundness is expressed by the Markov deterioration model and the Poisson hidden Markov deterioration model, in which the frequency of local damage depends on the distribution of pavement soundness, is formulated. In addition, the authors suggest a model estimation method using the Markov Chain Monte Carlo (MCMC) method, and attempt to demonstrate the applicability of the proposed Poisson hidden Markov deterioration model by studying concrete application cases.

Nam, Le Thanh; Kaito, Kiyoyuki; Kobayashi, Kiyoshi; Okizuka, Ryosuke

303

The impact of material characteristics on tire pavement interaction noise for flexible pavements  

NASA Astrophysics Data System (ADS)

Noise pollution has recently been one of the growing problems all over the world. While there are many sources of the noise, traffic noise is the main contributor to the total environmental noise. Although there are different sources for traffic noise, the tire pavement interaction noise is the most dominant component within most city and highway limits. One of the ways to reduce the tire pavement noise is to improve the material characteristics of the pavements such that they produce less noise. In this study, the relationship between basic material characteristics (e.g., Hot Mix Asphalt (HMA) volumetrics) and sound generation and absorption characteristics of flexible pavements was investigated. In addition, the effect of linear visco-elastic properties (e.g., dynamic modulus (|E*|) and phase angle (delta)) on sound absorption was studied. In order to focus only on impact of material characteristics and overshadow the effect of surface texture, a novel laboratory tire pavement noise measurement simulator (TIPANOS) was developed. The statistical analysis results showed that although the individual material characteristics do not have appreciable influence on sound absorption, there is a significant correlation between sound pressure levels (SPL) and combination of several material and linear visco-elastic parameters.

Kocak, Salih

304

45. Starboard elevation under way. Note large turtle deck and ...  

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

45. Starboard elevation under way. Note large turtle deck and crane configuration. - U.S. Coast Guard Cutter WHITE SUMAC, U.S. Coast Guard 8th District Base, 4640 Urquhart Street, New Orleans, Orleans Parish, LA

305

46 CFR 108.167 - Weather deck ladders.  

Code of Federal Regulations, 2011 CFR

...108.167 Section 108.167 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) A-MOBILE OFFSHORE DRILLING UNITS DESIGN AND EQUIPMENT Construction and Arrangement Means of Escape § 108.167 Weather deck...

2011-10-01

306

51. Port elevation, in port. Note reduced turtle deck due ...  

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

51. Port elevation, in port. Note reduced turtle deck due to quarters expansion. - U.S. Coast Guard Cutter WHITE SUMAC, U.S. Coast Guard 8th District Base, 4640 Urquhart Street, New Orleans, Orleans Parish, LA

307

42. View from forward end of poop deck, port side, ...  

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

42. View from forward end of poop deck, port side, looking aft toward poop capstan, booby hatch, and mizzenmast. Photograph by Russell Booth, June 1989. - Ship BALCLUTHA, 2905 Hyde Street Pier, San Francisco, San Francisco County, CA

308

6. DECK #4 TOPSIDE FROM NORTHEAST CORNER END PIECE FOR ...  

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

6. DECK #4 TOPSIDE FROM NORTHEAST CORNER END PIECE FOR ROBOTIC ARM FOR ANCHORING ASTRONAUT FOR MECHANICAL WORK. - Marshall Space Flight Center, Neutral Buoyancy Simulator Facility, Rideout Road, Huntsville, Madison County, AL

309

46 CFR 11.910 - Subjects for deck officer endorsements.  

Code of Federal Regulations, 2010 CFR

...MARINE OFFICERS AND SEAMEN REQUIREMENTS FOR OFFICER ENDORSEMENTSSubjects of Examinations and Practical Demonstrations of Competence § 11.910Subjects for deck officer endorsements. Table 11.910-1 gives the codes used in table...

2010-10-01

310

Turntable control cab. Note metal pointer on wood decking opposite ...  

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

Turntable control cab. Note metal pointer on wood decking opposite end of rail, used by operator to align table with tracks. - Bessemer and Lake Erie Railroad, Greenville Shops, 86 Ohl Street, Greenville, Mercer County, PA

311

69. VIEW OF DECK AND PILINGS FROM LIFEGUARD TOWER AT ...  

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

69. VIEW OF DECK AND PILINGS FROM LIFEGUARD TOWER AT 2ND TEE, LOOKING NORTH, SHOWING NEPTUNE'S LOCKER AND CAPTAIN'S GALLEY IN BACKGROUND AT RIGHT - Huntington Beach Municipal Pier, Pacific Coast Highway at Main Street, Huntington Beach, Orange County, CA

312

48. VIEW OF PIER DECK, TAKEN FROM HALFWAY BETWEEN APPPROACH ...  

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

48. VIEW OF PIER DECK, TAKEN FROM HALFWAY BETWEEN APPPROACH AND 1ST TEE, LOOKING SOUTHWEST, SHOWING CAPTAIN'S GALLEY (LEFT) AND NEPTUNE'S LOCKER (RIGHT) - Huntington Beach Municipal Pier, Pacific Coast Highway at Main Street, Huntington Beach, Orange County, CA

313

47. VIEW OF PIER DECK, LOOKING SOUTHWEST FROM GATE, SHOWING ...  

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

47. VIEW OF PIER DECK, LOOKING SOUTHWEST FROM GATE, SHOWING CAPTAIN'S GALLEY (LEFT) AND NEPTUNE'S LOCKER (RIGHT) IN CENTER - Huntington Beach Municipal Pier, Pacific Coast Highway at Main Street, Huntington Beach, Orange County, CA

314

Structural loading of cross deck connections for trimaran vessels  

E-print Network

This work investigates the fundamental relationships of wave loading on cross deck structures for trimaran vessels. In contrast with a monohull ship, trimaran vessels experience several possible structural loading cases ...

Rhoads, Jason L

2004-01-01

315

Facility S 372, replacement dolphins and ramp from upper deck ...  

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

Facility S 372, replacement dolphins and ramp from upper deck of ferry boat (YFB 87). - U.S. Naval Base, Pearl Harbor, Ferry Landing Type, Halawa Landing on Ford Island, Pearl City, Honolulu County, HI

316

12. VIEW NORTH, ACROSS DECK CENTER AREA SHOWING ASPHALT AND ...  

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

12. VIEW NORTH, ACROSS DECK CENTER AREA SHOWING ASPHALT AND NORTH SIDE GUARD WALL - Route 1 Extension, South Street Viaduct, Spanning Conrail & Wheeler Point Road at South Street, Newark, Essex County, NJ

317

19. Main deck just forward of fish batch, portion of ...  

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

19. Main deck just forward of fish batch, portion of fish hatch cover has been opened to show the ventilation grate below. - Schooner "Lettie G. Howard", South Street Seaport Museum, New York, New York County, NY

318

Upper storied from west roof deck with curving railing in ...  

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

Upper storied from west roof deck with curving railing in foreground - Fitzsimons General Hospital, Main Hospital Building, Charlie Kelly Boulevard, North side, at intersection of Sharon A. Lane Drive, Aurora, Adams County, CO

319

1. Viaduct deck, Omaha livestock market offices to left. ...  

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

1. Viaduct deck, Omaha livestock market offices to left. - South Omaha Union Stock Yards, "O" Street Viaduct, "O" Street Spanning Hog Pens; South Omaha Terminal Railway Company Tracks & Union Pacific Railroad Tracks, Omaha, Douglas County, NE

320

87. AFT CREWS' MESS DECK STARBOARD LOOKING TO PORT ...  

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

87. AFT CREWS' MESS DECK - STARBOARD LOOKING TO PORT SHOWING COFFEE MAKER, ICE CREAM FREEZER, TABLES AND SCUTTLEBUTTS. - U.S.S. HORNET, Puget Sound Naval Shipyard, Sinclair Inlet, Bremerton, Kitsap County, WA

321

11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF ...  

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

11. DETAIL SHOWING ROLLING ENGINE DECK AND NORTHEAST TRUSS OF SUPERSTRUCTURE. Looking northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

322

8. SOUTH REAR, SUPERSTRUCTURE. Looking north from deck. Edwards ...  

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

8. SOUTH REAR, SUPERSTRUCTURE. Looking north from deck. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

323

15. Detail, view northeast across second floor deck. Scale visible ...  

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

15. Detail, view northeast across second floor deck. Scale visible at right of door opening into 'Fireplace' room. 'Van Gogh' room at left. - Deetjen's Big Sur Inn, Hayloft Building, East Side of State Highway 1, Big Sur, Monterey County, CA

324

8. Working decks for buoy maintenance. White Sage on left, ...  

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

8. Working decks for buoy maintenance. White Sage on left, White Holly on right. - U.S. Coast Guard Cutter WHITE HOLLY, U.S. Coast Guard 8th District Base, 4640 Urquhart Street, New Orleans, Orleans Parish, LA

325

Astronaut Claude Nicollier at RMS controls on aft flight deck  

NASA Technical Reports Server (NTRS)

Swiss Astronaut Claude Nicollier is pictured at the aft flight deck station he occupies. Among Nicollier 's responsibilities were the control of the Remote Manipulator System (RMS) during operations with the Hubble Space Telesocpe (HST).

1993-01-01

326

14. Car deck, looking forward, 1915 Mack Truck on left ...  

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

14. Car deck, looking forward, 1915 Mack Truck on left with 1926 Dodge behind, 1937 Diamond Pickup Truck on right with 1931 Ford Model A Mail Truck behind. - Ferry EUREKA, Hyde Street Pier, San Francisco, San Francisco County, CA

327

5. TOPSIDE VIEW FROM UPPER DECK LOOKING DOWN INTO TANK ...  

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

5. TOPSIDE VIEW FROM UPPER DECK LOOKING DOWN INTO TANK WITH SHUTTLE CARGO BAY MOCK-UP AT BOTTOM OF 40 FOOT TANK. - Marshall Space Flight Center, Neutral Buoyancy Simulator Facility, Rideout Road, Huntsville, Madison County, AL

328

4. TOPSIDE VIEW FROM UPPER DECK LOOKING DOWN INTO TANK ...  

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

4. TOPSIDE VIEW FROM UPPER DECK LOOKING DOWN INTO TANK WITH SHUTTLE CARGO BAY MOCK-UP AT BOTTOM OF 40 FOOT TANK. - Marshall Space Flight Center, Neutral Buoyancy Simulator Facility, Rideout Road, Huntsville, Madison County, AL

329

General view of he forward wall of the mid deck ...  

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

General view of he forward wall of the mid deck of the Orbiter Discovery. In this view a majority of wall panels have been removed to reveal the avionics bays in the interstitial space between the mid deck forward wall and the forward bulkhead of the pressurized crew compartment. This photograph was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

330

Smart Road Pavement Research HomePage  

NSDL National Science Digital Library

Dubbed "the Smart Road" by Virginia's Department of Transportation, this full-scale facility for pavement research and evaluation of high-tech transportation systems uses computers, electronics, and satellites to create a realistic environment for collecting traffic and environmental data under controlled conditions, "and should advance the general understanding of the engineering behavior of pavement systems." This site, from the Virginia Tech Civil Engineering Materials Program, provides information from the researchers who have designed the Smart Road. The page contains a description of the project's current status, an explanation of objectives, construction photos, a detailed description of the instrumentation used, and data. Note, the research plan and testing links are still under construction. This site introduces an interesting project for highway and transportation engineers.

331

Bridging Anticoagulation  

MedlinePLUS

... practical approach . Blood . 2011 ; 117 : 5044 – 5049 . FREE Full Text Spyropoulos AC . Bridging therapy and oral anticoagulation: current ... doi: 10.1161/CIRCULATIONAHA.111.084517 Extract Free » Full Text Free PDF Free Classifications Cardiology Patient Page Services ...

332

Small-scale accelerated pavement testing  

SciTech Connect

This paper presents the results of a study conducted to explore the use of small-scale models of accelerated pavement testing (APT) devices to evaluate the performance of pavements in conjunction with full-scale tests. The motivation for the study was the availability of a model mobile load simulator (MMLS), which had been built originally to illustrate the operation of the full-scale mobile load simulator (MLS) under design at the time. The scaling requirements will be different depending on whether dynamic (inertia), viscous, or gravity effects are important. One must thus decide which one of these effects controls the behavior to try to reproduce it exactly. In the preliminary tests conducted with the MMLS, emphasis had been placed in reproducing accurately the viscoelastic behavior of the asphalt layer. The possibility of obtaining valid results, even if similitude is not maintained in relation to inertia forces, is explored in this paper. The effects of load frequency or velocity and the effects of layer thicknesses are studied. The total thickness of the model pavement, which must be finite, and its effects on displacements and strains are also considered. It is concluded that even when full similitude is not satisfied it is possible to obtain valid results that can be extrapolated to predict prototype performance if one were interested primarily in the behavior of the asphalt layer. Preliminary analyses should be conducted, however, to guide on the selection of the model dimensions.

Kim, S.M. [Korea Highway Corp., Kyunggi (Korea, Republic of). Highway Research Inst.; Hugo, F. [Univ. of Stellenbosch (South Africa). Inst. for Transport Technology; Roesset, J.M. [Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering

1998-03-01

333

Spaghetti Bridge  

NSDL National Science Digital Library

Play with your food while learning about engineering! Build a spaghetti bridge, then test its strength by piling on the marshmallows, raw spaghetti, raw linguine and coins. Investigate the difference between the strength of bridges made from flat and round building materials (spaghetti is round, while linguine is flat). Learn by doing that circles are among the strongest shapes in nature, and that external and internal stress distributes itself evenly throughout a round structure.

Sciencenter

1999-01-01

334

Embedded chloride detectors for roadways and bridges  

NASA Astrophysics Data System (ADS)

The problems associated with the application of chloride-based deicing agents to roadways and specifically bridges include chemical pollution and accelerated corrosion of strength members (especially rebar) within the structure. In many instances, local ordinances are attempting to force state agencies to reduce, if not eliminate, the use of these chlorides (typically at the cost of increased driving hazards). With respect to the corrosion aspects of chloride application, cracks that occur in the roadway/bridge pavement allow water to seep into the pavement carrying the chloride to the rebar with the resultant increase in corrosion. In response to this problem, particularly in high roadsalt usage areas, a chloride/water impermeable membrane is placed above the rebar matrix so if/when roadway cracking occurs, the roadsalts won't be able to damage the rebar. Such a membrane is costly -- and the question of its in-service performance is questionable. In a joint effort between the University of Vermont and the Vermont Agency of Transportation, we are developing fiber optic chloride detectors which are capable of being embedded into the rebar-concrete roadway under this membrane. The sensing mechanism relies on spectroscopic analysis of a chemical reaction of chloride and reagents (which have been coated onto the ends of fibers). Laboratory results of these detectors and a usable system configuration are presented.

Fuhr, Peter L.; Huston, Dryver R.; McPadden, Adam P.; Cauley, Robert F.

1996-04-01

335

Permeable Pavement Demonstration at the Edison Environmental Center (Hartford)  

EPA Science Inventory

In general, there is a lack of full-scale, outdoor, real-world porous pavement studies with system replicates. More studies of porous pavement operating in its intended use (parking lot, roadway, etc.) with climatic events, regular use, and maintenance effects, are necessary. The...

336

Permeable pavement demonstration at the Edison Environmental Center (Hartford, CT)  

EPA Science Inventory

In general, there is a lack of full-scale, outdoor, real-world porous pavement studies with system replicates. More studies of porous pavement operating in its intended use (parking lot, roadway, etc.) with climatic events, regular use, and maintenance effects, are necessary. The...

337

Permeable Pavement Monitoring at the Edison Environmental Center Demonstration Site  

EPA Science Inventory

There are few detailed studies of full-scale, replicated, actively-used pervious pavement systems. Practitioners need additional studies of pervious pavement systems in its intended application (parking lot, roadway, etc.) during a range of climatic events, daily usage conditions...

338

Permeable pavement monitoring at the Edison Environmental Center demonstration site  

EPA Science Inventory

There are few detailed studies of full-scale, replicated, actively-used pervious pavement systems. Practitioners need additional studies of pervious pavement systems in its intended application (parking lot, roadway, etc.) during a range of climatic events, daily usage conditions...

339

Portland Cement Concrete Pavement Shannon Golden, Alabama DOT  

E-print Network

Portland Cement Concrete Pavement Shannon Golden, Alabama DOT PORTLAND CEMENT CONCRETE PAVEMENT may be substituted for part of the required Portland cement. Substitution of mineral admixtures shall Cement shall not exceed the percentages shown in the following table: MAXIMUM ALLOWABLE SUBSTITUTION

340

Guide to Cement-Based Integrated Pavement Solutions  

E-print Network

Guide to Cement-Based Integrated Pavement Solutions August 2011 #12;Cement-Based Integrated Commercial Residential Recreation LAND USE CEMENT-BASED INTEGRATED PAVEMENT SOLUTIONS 1 2 3 4 5 6 7 8 Conventional Overlays CRCP VIBRATORY COMPACTION Pervious Concrete Full-Depth Reclamation Cement- Treat- ed Base

341

Fuzzy optimization BP neural network model for pavement performance assessment  

Microsoft Academic Search

This paper discussed the use of fuzzy optimization BP neural network as a management tool for the maintenance of expressway pavement. The algorithm was applied to model pavement performance evaluation, successful in accurately and quickly capturing the high nonlinear characteristics between objective practical data and subjective synthetic evaluations, avoided the neural network activation function's defects of unclear physical meanings. A

Yan Liu; Min Sun

2007-01-01

342

Energy equivalents for selected pavement materials: Their production and placement  

NASA Astrophysics Data System (ADS)

Energy requirements for selected pavement surfaces are discussed. Energy requirements for hot-mixed bituminous recycling and portland cement concrete recycling projects are presented along with conventional pavement methods. Energy requirements for conventional thin surface treatments are also discussed. Environmental analyses involving both air and noise quality measurement are included for various recycling and conventional paving options.

Lane, K. R.

1981-03-01

343

Experimental study on properties of pervious concrete pavement materials  

Microsoft Academic Search

In this paper, a pervious concrete pavement material used for roadway is introduced. Using the common material and method, the strength of the pervious concrete is low. Using smaller sized aggregate, silica fume (SF), and superplasticizer (SP) in the pervious concrete can enhance the strength of pervious concrete greatly. The pervious pavement materials that composed of a surface layer and

Jing Yang; Guoliang Jiang

2003-01-01

344

211. EQUIPMENT LAYING FIRST LANE OF CONCRETE PAVEMENT NEAR THE ...  

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

211. EQUIPMENT LAYING FIRST LANE OF CONCRETE PAVEMENT NEAR THE CAPITAL OVERLOOK, 1931. NOTE THE BEGINNING OF BITUMINOUS TYPE OF TEMPORARY PAVEMENT TO ALLOW FOR SETTLEMENT IN HYDRAULIC FILL AREAS. - George Washington Memorial Parkway, Along Potomac River from McLean to Mount Vernon, VA, Mount Vernon, Fairfax County, VA

345

Airport pavement management systems: an appraisal of existing methodologies  

Microsoft Academic Search

Airport pavement management systems (APMS) are computer-based decision support systems that can be used by the agencies running airports to determine cost-effective maintenance and rehabilitation strategies to preserve the various pavement structures (runways, taxiways, etc.) which are a critical component of these facilities. In this paper, we describe the main elements of APMS and review existing systems.

Michel Gendreau; Patrick Soriano

1998-01-01

346

Fracture resistance characterization of chemically modified crumb rubber asphalt pavement  

Microsoft Academic Search

The fracture resistance of chemically modified crumb rubber asphalt (CMCRA) pavement was evaluated based on the J-integral concept. The chemical modification process used was developed by the Federal Highway Administration and patented in 1998. The results were compared to that of crumb rubber asphalt (CRA) and control asphalt pavement. Four semi-circular core specimens (76 mm radius and 57 mm thickness)

M. A. Mull; K. Stuart; A. Yehia

2002-01-01

347

Permeable pavement demonstration site at Edison Environmental Center (Presentation)  

EPA Science Inventory

There are few studies of full-scale, outdoor, replicated, working pervious pavement systems. More studies of pervious pavement operating in its intended use (parking lot, roadway, etc.) during a range of climatic events, daily usage conditions, and maintenance regimes are necessa...

348

Permeable pavement demonstration at the Edison Environmental Center  

EPA Science Inventory

There are few studies of full-scale, outdoor, replicated, functioning pervious pavement systems. More studies of pervious pavement operating in its intended use (parking lot, roadway, etc.) during a range of climatic events, daily usage conditions, and maintenance regimes are nec...

349

Permeable Pavement Research at the Edison Environmental Center  

EPA Science Inventory

There are few detailed studies of full-scale, replicated, actively-used permeable pavement systems. Practitioners need additional studies of permeable pavement systems in its intended application (parking lot, roadway, etc.) across a range of climatic events, daily usage conditio...

350

Full-Depth Asphalt Pavements for Parking Lots and Driveways.  

ERIC Educational Resources Information Center

The latest information for designing full-depth asphalt pavements for parking lots and driveways is covered in relationship to the continued increase in vehicle registration. It is based on The Asphalt Institute's Thickness Design Manual, Series No. 1 (MS-1), Seventh Edition, which covers all aspects of asphalt pavement thickness design in detail,…

Asphalt Inst., College Park, MD.

351

Geosynthetics in pavements: North American contributions Zornberg, J.G. & Gupta, R.  

E-print Network

Geosynthetics in pavements: North American contributions Zornberg, J.G. & Gupta, R. The University, pavement, design ABSTRACT: Geosynthetics have been used to reinforce the base layer of flexible pavement reinforcements can im- prove pavement performance, the specific conditions or mechanisms that enable and govern

Zornberg, Jorge G.

352

Project Information Form Project Title White Paper on The application of permeable pavement with emphasis  

E-print Network

Project Information Form Project Title White Paper on The application of permeable pavement Project Depending on the type of surface pavement, permeable pavement can be termed as porous asphalt and improve water quality as well as urban heat island, the application of permeable pavement in urban areas

California at Davis, University of

353

Full scale tests on grid reinforced flexible pavements on the French fatigue carrousel  

E-print Network

Full scale tests on grid reinforced flexible pavements on the French fatigue carrousel Pierre the long term life of grid reinforced pavements. This paper describes a full scale experiment carried out on the large pavement fatigue carrousel of IFSTTAR, to test simultaneously 3 pavement sections with different

Boyer, Edmond

354

Lower bound shakedown analysis of layered pavements using discontinuous stress fields  

Microsoft Academic Search

Pavements and railways are subjected to repeated wheel loads of different magnitudes. Both load magnitudes and number of repetitions of load need to be considered in order to avoid significant damages to a pavement. A conventional finite element technique is convenient for calculating static pavement responses, but the prediction of pavement performance under repeated loading is much more difficult as

H. S. Yu; M. Z. Hossain

1998-01-01

355

New structural systems for zero-maintenance pavements. Volume 3: Anchored pavement system designed for Edens Expressway  

Microsoft Academic Search

The response of the Edens Expressway subjected to mechanical and environmental loads using the anchored pavement concept is discussed. The mechanical and thermal properties of materials that could be encountered in future reconstruction of Edens Expressway are presented in a consistent form for computer programming. These properties are viewed as typical design values during investigation of pavement response. The behavior

S. K. Saxena; S. G. Militsopoulos

1980-01-01

356

Linking Bridges  

NSDL National Science Digital Library

This blog post presents three puzzles which provide an opportunity for learners to use the strategy of trial and error and logical reasoning. The challenge is to connect all of the islands with bridges so that the number on the island corresponds to the number of bridges going to it or from it. This activity also provides the opportunity for students to be puzzle designers by including a blank grid page on which students can design their own versions of the puzzle to share with classmates.

Young, David

2014-01-28

357

Geotextiles, one among the different geosynthetic products, can be used for a number of functions or applications in pavement design. Specifically, woven or nonwoven geotextiles have been used in pavements to fulfill the  

E-print Network

or applications in pavement design. Specifically, woven or nonwoven geotextiles have been used in pavements of geotextile and its location within the pavement system. The benefits of using geotextiles in pavements for more cost-effective pavements are probably being missed by not using (or by incorrectly using

Zornberg, Jorge G.

358

The new Mechanistic-Empirical Pavement Design Guide (MEPDG) developed under the National Cooperative Highway Research Program (NCHRP) Project 1-37A represents a major change as compared to the 1993 AASHTO Pavement  

E-print Network

The new Mechanistic-Empirical Pavement Design Guide (MEPDG) developed under the National AASHTO Pavement Design Guide. MEPDG provides a rational pavement design framework based on the pavement performance. Before replacing the 1993 Pavement Design Guide (and its accompanying DARWin 3

Harms, Kyle E.

359

Tire Footprint Affects Hydroplaning On Wet Pavement  

NASA Technical Reports Server (NTRS)

Recent investigations of tire hydroplaning at highway speeds reveal, in addition to inflation pressure, tire-footprint aspect ratio (FAR), defined as width divided by length of tire surface in contact with pavement, significantly influences speed at which dynamic hydroplaning begins. Tire speeds and forces developed during tests of up to 65 mi/h (105 km/h) were monitored on flooded test surface to identify development of hydroplaning. Study focused on automotive tires because FAR's of automotive tires vary more than those of aircraft tires.

Yager, Thomas J.

1989-01-01

360

A Prototype Roof Deck Designed to Self-Regulate Deck Temperature and Reduce Heat Transfer  

SciTech Connect

A prototype roof and attic assembly exploits the use of radiation, convection and insulation controls to reduce its peak day heat transfer by almost 85 percent of the heat transfer crossing a conventional roof and attic assembly. The assembly exhibits attic air temperatures that do not exceed the maximum daily outdoor ambient temperature. The design includes a passive ventilation scheme that pulls air from the soffit and attic into an inclined air space above the roof deck. The design complies with fire protection codes because the air intake is internal and closed to the elements. Field data were benchmarked against an attic computer tool and simulations made for new and retrofit constructions in hot, moderate and cold climates to gauge the cost of energy savings and potential payback.

Miller, William A [ORNL] [ORNL

2011-01-01

361

Bridges, 1999.  

ERIC Educational Resources Information Center

This volume contains articles about writing, best practice, portfolio assessment, and technology, as well as original poetry and book reviews. Articles in the volume are: "Teaching Writing: Making Connections" (Eric Schott); "Empowering Teachers: A Success Story" (Sandra L. Krivak); "Bridging the Gap between the Classroom and Employment" (Linda C.…

Wilcox, Bonita; Manear, John; Slifkin, Josh M.

362

Performance-Based Concrete Pavement Mix Design System Performance-Based Design Guide for New and Rehabilitated  

E-print Network

Strategic Research Plan #12;· Performance-Based Concrete Pavement Mix Design System · Performance-Based Design Guide for New and Rehabilitated Concrete Pavements · High-Speed Nondestructive Testing Pavements · High-Speed Concrete Pavement Rehabilitation and Construction · Concrete Pavement Business

363

46 CFR 11.504 - Application of deck service for limited engineer endorsements.  

Code of Federal Regulations, 2010 CFR

...of deck service for limited engineer endorsements. 11.504 Section 11.504 Shipping...AND SEAMEN REQUIREMENTS FOR OFFICER ENDORSEMENTS Professional Requirements for Engineer...of deck service for limited engineer endorsements. Service gained in the...

2010-10-01

364

76 FR 62603 - Special Conditions: The Boeing Company, Model 747-8; Upper Deck Occupancy  

Federal Register 2010, 2011, 2012, 2013

...deck emergency lighting system power supplies. (b) The upper deck emergency...event of the loss of the main power supply. (2) They must be capable of...Transport Airplane Directorate, Aircraft Certification Service. [FR...

2011-10-11

365

46 CFR 72.05-10 - Type, location, and construction of fire control bulkheads and decks.  

...side of the bulkhead or above and below the deck. (1...more than 325 °F. above the original temperature, within the time listed below: Class A-60 60...to the structural decks above and below so as to...

2014-10-01

366

46 CFR 72.05-10 - Type, location, and construction of fire control bulkheads and decks.  

Code of Federal Regulations, 2012 CFR

...side of the bulkhead or above and below the deck. (1...more than 325 °F. above the original temperature, within the time listed below: Class A-60 60...to the structural decks above and below so as to...

2012-10-01

367

46 CFR 72.05-10 - Type, location, and construction of fire control bulkheads and decks.  

Code of Federal Regulations, 2011 CFR

...side of the bulkhead or above and below the deck. (1...more than 325 °F. above the original temperature, within the time listed below: Class A-60 60...to the structural decks above and below so as to...

2011-10-01

368

46 CFR 72.05-10 - Type, location, and construction of fire control bulkheads and decks.  

Code of Federal Regulations, 2010 CFR

...side of the bulkhead or above and below the deck. (1...more than 325 °F. above the original temperature, within the time listed below: Class A-60 60...to the structural decks above and below so as to...

2010-10-01

369

46 CFR 72.05-10 - Type, location, and construction of fire control bulkheads and decks.  

Code of Federal Regulations, 2013 CFR

...side of the bulkhead or above and below the deck. (1...more than 325 °F. above the original temperature, within the time listed below: Class A-60 60...to the structural decks above and below so as to...

2013-10-01

370

Assessment on transient sound radiation of a vibrating steel bridge due to traffic loading  

NASA Astrophysics Data System (ADS)

Structure-borne noise induced by vehicle-bridge coupling vibration is harmful to human health and living environment. Investigating the sound pressure level and the radiation mechanism of structure-borne noise is of great significance for the assessment of environmental noise pollution and noise control. In this paper, the transient noise induced by vehicle-bridge coupling vibration is investigated by employing the hybrid finite element method (FEM) and boundary element method (BEM). The effect of local vibration of the bridge deck is taken into account and the sound responses of the structure-borne noise in time domain is obtained. The precision of the proposed method is validated by comparing numerical results to the on-site measurements of a steel girder-plate bridge in service. It implies that the sound pressure level and its distribution in both time and frequency domains may be predicted by the hybrid approach of FEM-BEM with satisfactory accuracy. Numerical results indicate that the vibrating steel bridge radiates high-level noise because of its extreme flexibility and large surface area for sound radiation. The impact effects of the vehicle on the sound pressure when leaving the bridge are observed. The shape of the contour lines in the area around the bridge deck could be explained by the mode shapes of the bridge. The moving speed of the vehicle only affects the sound pressure components with frequencies lower than 10 Hz.

Zhang, He; Xie, Xu; Jiang, Jiqing; Yamashita, Mikio

2015-02-01

371

Detail view of the interior of the flight deck looking ...  

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

Detail view of the interior of the flight deck looking forward showing the overhead control panels. Note that the flight deck windows have protective covers over them in this view. This images can be digitally stitched with image HAER No. TX-116-A-19 to expand the view to include the Commander and Pilot positions during ascent and reentry and landing. This view was taken in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

372

Cognitive representations of flight-deck information attributes  

NASA Technical Reports Server (NTRS)

The experiment described in this paper had two ojectives. The first objective was to empirically identify how pilots organize flight-deck information attributes. Such an organization should provide a useful nomenclature for classifying Information Management (IM) issues and problems. The second objective of this study was to empirically assess pilots' estimate of the relative importance of each attribute on managing information. Results from addressing this latter objective were intended to suggest areas on which flight-deck researchers and designers will want to focus their attention.

Ricks, Wendell R.; Jonsson, Jon E.; Rogers, William H.

1993-01-01

373

Legislative seminars ..............2 Pavement conference..............2  

E-print Network

how people use the transportation system and how transportation and land use interact. (For more about the Minnesota Department of Transportation (Mn/DOT) to evaluate data from instrumentation on the new I-35W Faculty Scholars. The new bridge was instrumented with "smart bridge technology" to monitor

Minnesota, University of

374

Asphalt Pavement Aging and TemperatureAsphalt Pavement Aging and Temperature Dependent Properties using a FunctionallyDependent Properties using a Functionally  

E-print Network

Asphalt Pavement Aging and TemperatureAsphalt Pavement Aging and Temperature Dependent Properties(132) 3 #12;Functionally Graded Viscoelastic AsphaltFunctionally Graded Viscoelastic Asphalt Concrete ModelConcrete Model Motivation and Introduction Viscoelastic Characterization of Asphalt Concrete

Paulino, Glaucio H.

375

Digital Bridges: Bridges of the Nineteenth Century  

NSDL National Science Digital Library

The collection consists of thirty representative 19th-century American bridge engineering monographs, manuals, and documents from the Lehigh University Libraries' Special Collections. The source documents have been scanned, converted to text, and partially corrected to make all significant terms and personal and proper names retrievable through the site's search engine. Topics include specific bridges (the Brooklyn Bridge, the East River Bridge), bridge types (suspension bridges, wrought iron bridges), bridge components (cabling, foundations), bridge design, bridge disasters, and others. The collection is browseable by title and searchable by keyword. Printable versions of the documents are also available. A glossary is also provided with definitions of terms, short biographies of authors, and descriptions of some of the bridges

2002-01-01

376

Encryption with a Deck of Cards This is a team assignment.  

E-print Network

Encryption with a Deck of Cards Overview: This is a team assignment. For this assignment, we are going to encrypt a string of text using a deck of cards. This technique is considerably harder to break strightforward. We'll be assuming that we have just two suits (say, hearts and spades) from a deck of cards, plus

Musicant, Dave

377

A Human-Interactive Course of Action Planner for Aircraft Carrier Deck Operations  

E-print Network

would generate a schedule of coordinated deck operations for all active aircraft (taxi, refuel, take offA Human-Interactive Course of Action Planner for Aircraft Carrier Deck Operations Bernard Michini USA Aircraft carrier deck operations present a complex and uncertain environment in which time

How, Jonathan P.

378

Effects of pavement surface characteristics and textures on skid resistance  

E-print Network

to the pavement suriace between parallel lines of nmsking tape and then worked into the surface voids with an aluminum squeeoee faced neith a rubber pad having a hardness approxi- mately equivalent to that of a tire tread rubber. An average tex- ture depth... particles m?ch like a tire tread element. Hater is poured into the cylinder, and the time required for a known volume of water to es- cape through any pores in the pavement and between the rubber ring and the pavement surface is measured. The water...

Tomita, Hisao

1970-01-01

379

An advanced algorithm for highway pavement fissure detection  

NASA Astrophysics Data System (ADS)

This paper presents image detection method of pavement crack based on fractal dimension feature and designs self-adapting algorithm of fractal dimension interval of pavement region. Through image pretreatment, calculation of fractal dimension, self-adapting calculation of dimension interval, we obtain the location image of damage pavement. The experimental results of transverse crack, longitudinal crack, net-shaped crack, pit slot are contrast with that of Sobel operator. The results show that they have the similar capability on the representation of crack, but the proposed method is more flexible on the aspect of representation of crack size and calculation of damage ratio.

Chen, Bei; Cao, Wenlun; He, Yuyao

2012-04-01

380

Special Fluid Viscous Dampers For The Messina Strait Bridge  

NASA Astrophysics Data System (ADS)

The Messina Strait Bridge would be the world's longest suspension bridge, with a design earthquake characterised by a PGA value of 0.58 g and a distance between the ipocenter and the bridge of 15 km. Said critical structure of course would need a suitable restraint system for traffic braking loads, wind and seismic actions. Each type of load requires a specific behaviour of the restraint system, making its design a big challenge. The restraint system comprises special types of fluid viscous dampers, installed both in longitudinal and transverse direction, both at the towers and at the anchorages. In seismic conditions they behave as viscous dampers, to reduce the forces on the structural elements and the movements of the bridge deck. But in service dynamic conditions, e.g. under traffic or wind load, the devices shall behave like shock transmission units, thus preventing the longitudinal and transverse movements of the deck. FIP Industriale cooperated with the selected General Contractor, a consortium lead by Impregilo, in the design of said viscous dampers. This paper describes the main features of said devices.

Colato, Gian Paolo; Infanti, Samuele; Castellano, Maria Gabriella

2008-07-01

381

Road Materials and Pavements Design. Volume X No X/2013, pages 1 to n Review of glass fiber grid use for pavement  

E-print Network

Road Materials and Pavements Design. Volume X No X/2013, pages 1 to n Review of glass fiber grid use for pavement reinforcement and APT experiments at IFSTTAR Mai Lan Nguyen* Juliette Blanc* Jean performance, to extend service life and thus to reduce maintenance costs of road pavements. Among a large

Paris-Sud XI, Université de

382

Bridge Building  

NSDL National Science Digital Library

This is a quick activity (on page 2 of the PDF) about how the arrangement of carbon atoms determines carbon's different properties. Learners will build bridges with Post-It notes that model two types of carbon molecules, graphite and carbon nanotubes, and test which structure of the same material can bear the weight of the most pennies. Also relates to linked video, DragonflyTV Nano: Hockey Sticks.

Twin Cities Public Television, Inc.

2008-01-01

383

Building Bridges  

NSDL National Science Digital Library

In this lesson, students build bridges from arithmetical to algebraic thinking by exploring problems that are not limited to single-solution responses. Values organized into tables and graphs are used to move toward symbolic representations. Problem situations at the middle school level involve linear, quadratic, and exponential models. The site is valuable not only for its problems for students but also for the teaching strategy illustrated here.

Roger Day

2000-01-01

384

46 CFR 12.15-13 - Deck engine mechanic.  

Code of Federal Regulations, 2012 CFR

...rating of junior engineer on steam vessels of 4,000 horsepower...indoctrination and training in the engine department of an automated steam vessel of 4,000 horsepower...a course of training for deck engine mechanic acceptable to...

2012-10-01

385

46 CFR 12.15-13 - Deck engine mechanic.  

Code of Federal Regulations, 2011 CFR

...rating of junior engineer on steam vessels of 4,000 horsepower...indoctrination and training in the engine department of an automated steam vessel of 4,000 horsepower...a course of training for deck engine mechanic acceptable to...

2011-10-01

386

46 CFR 12.15-13 - Deck engine mechanic.  

Code of Federal Regulations, 2013 CFR

...rating of junior engineer on steam vessels of 4,000 horsepower...indoctrination and training in the engine department of an automated steam vessel of 4,000 horsepower...a course of training for deck engine mechanic acceptable to...

2013-10-01

387

View of the yacht club facing east. The new deck ...  

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

View of the yacht club facing east. The new deck and the avila pier are on the right and the harbor storage and restrooms are on the left. - San Luis Yacht Club, Avila Pier, South of Front Street, Avila Beach, San Luis Obispo County, CA

388

STS-30 Commander Walker on forward flight deck  

NASA Technical Reports Server (NTRS)

On Atlantis', Orbiter Vehicle (OV) 104's, forward flight deck between commanders and pilots seats, STS-30 Commander David M. Walker smiles while having his picture taken. Walker, wearing a mission polo shirt and light blue flight coverall pants, holds onto the commanders seat back. Forward flight control panels are visible above Walker's head and behind him.

1989-01-01

389

17. VIEW OF WORKING DECK AND BOOM AS VESSEL APPROACHES ...  

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

17. VIEW OF WORKING DECK AND BOOM AS VESSEL APPROACHES MOBILE BAY LIGHTHOUSE IN ORDER TO PERFORM MAINTENANCE. - U.S. Coast Guard Cutter WHITE PINE, U.S. Coast Guard 8th District Base, South Broad Street, Mobile, Mobile County, AL

390

19. On salon deck level, view looking forward at tops ...  

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

19. On salon deck level, view looking forward at tops of steam chimneys (rising from boilers) showing safety valves, safety valve vent pipe, and smoke bonnet underneath smokestack. Steam chimneys are integral parts of the boilers and in effect are smokestacks surrounded by a pressurized steam space continuous with the boiler steam spaces. - Ferry TICONDEROGA, Route 7, Shelburne, Chittenden County, VT

391

General view of the flight deck of the orbiter Discovery ...  

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

General view of the flight deck of the orbiter Discovery looking forward and overhead at the overhead instrumentation and control panels. This view was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

392

Closeup view of the aft flight deck of the Orbiter ...  

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

Close-up view of the aft flight deck of the Orbiter Discovery looking at the aft center control panels A6, A7, A8, A12, A13, A14, A16 and A17. This View was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

393

4. A member of a buoy tender's deck force prepares ...  

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

4. A member of a buoy tender's deck force prepares to trip the chain stopper. This will release the buoy's anchor for the plunge to the sea-floor. - U.S. Coast Guard Buoy Tenders, 180' Class, U.S. Coast Guard Headquarters, 2100 Second Street Southwest, Washington, District of Columbia, DC

394

11. MAIN DECK, VIEW FORWARD FROM MIDSHIP, LOOKING AT MIDSHIP ...  

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

11. MAIN DECK, VIEW FORWARD FROM MIDSHIP, LOOKING AT MIDSHIP CABINS, GALLEY AND STEAM-POWERED WINCH EQUIPMENT. TWO PORT OIL TANK HATCHES CAN BE SEEN AT LEFT AND ONE STARBOARD OIL TANK AT RIGHT - Ship "Falls of Clyde", Hawaii Maritime Center,Pier 7, Honolulu, Honolulu County, HI

395

85. VIEW FROM SOUTHWEST OF FUEL PIPELINE TO LAUNCH DECK. ...  

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

85. VIEW FROM SOUTHWEST OF FUEL PIPELINE TO LAUNCH DECK. SOUTHEAST CORNER OF SKID 2 VISIBLE ON LEFT. DOORS OF ROOMS ON SOUTHWEST SIDE OF LSB (BLDG. 770) VISIBLE IN CENTER OF PHOTO. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

396

14. OBLIQUE VIEW OF UPPER ORE BIN AND LOADING DECK, ...  

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

14. OBLIQUE VIEW OF UPPER ORE BIN AND LOADING DECK, LOOKING WEST. DETAIL OF SUPPORTING TIMBERS. THE LOCATION OF THIS ORE BIN IN RELATION TO THE MILL CAN BE SEEN IN MANY OF THE MILL OVERVIEWS. (CA-290-4 THROUGH CA-290-8). - Skidoo Mine, Park Route 38 (Skidoo Road), Death Valley Junction, Inyo County, CA

397

5. View to east of west elevation. Second story deck ...  

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

5. View to east of west elevation. Second story deck at right opens off 'Fireside' guest room; Helmuth Deetjen hand-carved the balusters. Scale just visible against first story wall at lower right. - Deetjen's Big Sur Inn, Hayloft Building, East Side of State Highway 1, Big Sur, Monterey County, CA

398

2. Viaduct deck, Omaha livestock market offices to left, hog ...  

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

2. Viaduct deck, Omaha livestock market offices to left, hog sheds to right. View to east. - South Omaha Union Stock Yards, "O" Street Viaduct, "O" Street Spanning Hog Pens; South Omaha Terminal Railway Company Tracks & Union Pacific Railroad Tracks, Omaha, Douglas County, NE

399

Multichannel Seismic Streamer Repair on the Helo Deck  

USGS Multimedia Gallery

The streamer is flaked out on the deck with a make shift workbench for tools.  The technical staff (Geological Survey of Canada) are sharing a lighter moment during trouble shooting and repair aboard CCGS Louis S. St-Laurent. Adequate space for repair of the 100-m long system is not available i...

400

17. VIEW OF INTERIOR, EAST SIDE, DECK LEVEL OF MST. ...  

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

17. VIEW OF INTERIOR, EAST SIDE, DECK LEVEL OF MST. NOTE CANVAS CURTAIN (RIGHT) USED TO COVER SOUTH SIDE OF MST BELOW LOWEST ENVIRONMENTAL DOORS. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

401

Electromagnetic environment characterization of below-deck spaces in ships  

Microsoft Academic Search

With wireless systems currently being introduced into confined, reflective spaces that were not originally intended for radio frequency emissions, it becomes necessary to assess the resultant electromagnetic environment of these spaces, especially where potential hazards may exist. In this work, we present experimental data to demonstrate that the below-deck compartments aboard Navy ships can be characterized as complex reverberant cavities.

Gregory B. Tait; Michael B. Slocum

2008-01-01

402

30. VIEW LOOKING FORWARD ON STARBOARD SIDE OF MAIN DECK ...  

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

30. VIEW LOOKING FORWARD ON STARBOARD SIDE OF MAIN DECK FROM ALONGSIDE ENGINE CONTROL PANEL. CONFIGURATION OF SKYLIGHTS AND COMPANIONWAY DIFFERENT FROM WHAT WAS FOUND BY HAER IN 1986. Original 4-3/4'x6-3/4' photograph taken c. 1930? - Pilot Schooner "Alabama", Moored in harbor at Vineyard Haven, Vineyard Haven, Dukes County, MA

403

19. TRAVELING CRANE ATOP SUPERSTRUCTURE, FROM RUN LINE DECK. Looking ...  

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

19. TRAVELING CRANE ATOP SUPERSTRUCTURE, FROM RUN LINE DECK. Looking up to north northeast. - Edwards Air Force Base, Air Force Rocket Propulsion Laboratory, Test Stand 1-A, Test Area 1-120, north end of Jupiter Boulevard, Boron, Kern County, CA

404

13. Oblique view northeast of west elevation, again showing deck ...  

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

13. Oblique view northeast of west elevation, again showing deck opening off 'Fireplace' room. Shed-roofed 'Van Gogh' room at left, second story. Scale placed at center, below balustrade. - Deetjen's Big Sur Inn, Hayloft Building, East Side of State Highway 1, Big Sur, Monterey County, CA

405

Meeting Mathematics Standards with a Deck of Playing Cards  

ERIC Educational Resources Information Center

The activities contained in this document have been presented at several conference sessions. Participants engaged in hands-on activities for Grades 3 through 8 that utilized a deck of playing cards to meet mathematics content and process standards. Activities included variations of card games, but with a mathematical twist, and other card-based…

McAllister, Deborah A.; McDonald, Shirley A.; Bothman, Susan M.

2010-01-01

406

Elevator Group Supervisory Control of Double-Deck and  

E-print Network

Elevator Group Supervisory Control of Double-Deck and Multi-Car Elevator Systems using and real world problems. GNP was firstly applied to Elevator Group Supervisory Control Syste m (EGSCS such as tile-worlds models. EGSCS is the system, where the elevator group supervisory controller controls

Fernandez, Thomas

407

22. STEAM PLANT TURBINE DECK FROM SOUTH END OF BUILDING, ...  

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

22. STEAM PLANT TURBINE DECK FROM SOUTH END OF BUILDING, SHOWING TOPS OF DIESEL ENGINES AT FAR NORTH END, PRIOR TO INSTALLATION OF STEAM UNIT NO. 4. Ca. 1948 - Crosscut Steam Plant, North side Salt River near Mill Avenue & Washington Street, Tempe, Maricopa County, AZ

408

New structural systems for zero-maintenance pavements. Volume 3: Anchored pavement system designed for Edens Expressway  

NASA Astrophysics Data System (ADS)

The response of the Edens Expressway subjected to mechanical and environmental loads using the anchored pavement concept is discussed. The mechanical and thermal properties of materials that could be encountered in future reconstruction of Edens Expressway are presented in a consistent form for computer programming. These properties are viewed as typical design values during investigation of pavement response. The behavior of the anchored pavement under induced temperature loads and weakening of subgrade (by thawing action) is clearly demonstrated. The example problem provides the input parameters of materials and loads for the analysis, the generation of finite element mesh, and the results of the analysis.

Saxena, S. K.; Militsopoulos, S. G.

1980-08-01

409

Evaluation of a new construction pavement section using the mechanistic-empirical pavement design guide  

NASA Astrophysics Data System (ADS)

The AASHTO Mechanistic-Empirical Design Guide (MEPDG) is one of several "next generation" pavement design approaches intended to address limitations of older empirical methods. This research investigated the capabilities and performance of the MEPDG through analyses of an empirically-designed section of NH Route 16, which the New Hampshire Department of Transportation (NHDOT) indicated may be under-designed. MEPDG distress predictions indicate that the pavement section should achieve a service life of at least 10 years. This was supported by the fatigue analysis of the base course, which also indicated that the pavement may have been damaged by traffic loads prior to the completion of the surface course. During this research, a number of limitations and model behaviors of the MEPDG were observed, some with significant importance to this analysis and to future projects within New Hampshire. Because implementation and full realization of the MEPDG requires significant investment, the results of this research should be considered before undertaking steps towards adoption of the software.

Lowe, Justin

410

Roswell International Air Center Airport (ROW) Pavement Condition and Analysis  

E-print Network

Roswell International Air Center Airport (ROW) Pavement Condition and Analysis Submitted to: Jane M ................................................1. Conditions at Roswell International Air Center (ROW) 4 .................................Figure 1. Geographic Location of Roswell International Air Center (ROW) 4 ..............................Table 1

Cal, Mark P.

411

Raton Municipal Airport (RTN) Pavement Condition and Analysis  

E-print Network

Raton Municipal Airport (RTN) Pavement Condition and Analysis Submitted to: Jane M. Lucero, AICP ...............................................................1. Conditions at Raton Municipal Airport (RTN) 4 ................................................Figure 1. Geographic Location of Raton Municipal Airport (RTN) 4

Cal, Mark P.

412

Incorporating uncertainty in the Life Cycle Cost Analysis of pavements  

E-print Network

Life Cycle Cost Analysis (LCCA) is an important tool to evaluate the economic performance of alternative investments for a given project. It considers the total cost to construct, maintain, and operate a pavement over its ...

Swei, Omar Abdullah

2012-01-01

413

Exploration of Pavement Oxidation Model Applications and Field Validation  

E-print Network

Asphalt paved road is one of the building blocks of the modem world. Flexibility is one of its major advantages; however, this flexibility suffers from asphalt oxidation since the first day of pavement service life. Several elements of binder...

Cui, Yuanchen

2014-08-11

414

Life cycle assessment of concrete pavements : impacts and opportunities  

E-print Network

The concrete pavement network in the United States plays a crucial role in the economy by enabling the transport of people and goods, but it also leads to resource consumption and environmental impacts. This thesis is ...

Loijos, Alex (Alexander Nikos)

2011-01-01

415

Asphalt pavement surfaces and asphalt mixtures. Transportation research record  

SciTech Connect

The papers in this volume, which deal with asphalt pavement surfaces and asphalt mixtures, should be of interest to state and local construction, design, materials, and research engineers as well as contractors and material producers. The papers in Part 1 include discussions of pavement smoothness specifications and skidding characteristics. The first four papers in Part 2 were submitted in response to a call for papers for a session at the 75th Annual Meeting of the Transportation Research Board on low-temperature properties of hot-mix asphalt. The next eight are on the influence of volumetric and strength properties on the performance of hot-mix asphalt. In the following three papers, the topics covered are the complex modulus of asphalt concrete, cold in-place asphalt recycling, and polymer modification of asphalt pavements in Ontario. The last two papers were presented in a session on relationship of materials characterization to accelerated pavement performance testing.

NONE

1996-12-31

416

Nondestructive evaluation of load transfer at rigid airport pavement joints  

NASA Astrophysics Data System (ADS)

Current design criteria for rigid pavements for commercial and military airfields assume that 25% of the load applied to an edge of a slab is transferred through the joint to an adjacent unloaded slab. A nondestructive testing technique using a falling weight deflectometer (FWD) was used to conduct field testing at a number of sites. A transfer function, developed from an analytical study, was used to estimate load transfer from the measured joint efficiency as a function of the loaded area and the radius of relative stiffness of the pavement. This procedure, although analytically sound, lacks actual field verification at an instrumented pavement site. This procedure was used to estimate load transfer at a number of commercial and military airfields for a variety of joint types, climate conditions, and pavement structures. The results of these tests indicate that the assumption of load transfer as a constant value of 25% appears to be unconservative, especially during the winter months.

Hammons, Michael I.

1995-07-01

417

Complex Modulus Prediction of Asphalt Concrete Pavement Cores  

E-print Network

. For field cores complex modulus measuring methods, except some expensive pavement field testers, empirical and semiempirical models are widely used, but an accurate mechanical test method is more desired. In this research, Arizona, Yellowstone National Park...

Ling, Meng

2013-12-02

418

Automated crack control analysis for concrete pavement construction  

E-print Network

probabilistic approach to determine the optimum time and depth of sawcutting for newly constructed portland cement concrete pavements. Variability in climate conditions and material characteristics during the hardening process affects the potential of cracking...

Jang, Se Hoon

2005-11-01

419

Recycled materials in asphalt pavements. (Latest citations from the NTIS bibliographic database). Published Search  

SciTech Connect

The bibliography contains citations concerning the recycling of asphalt pavement materials, and the use of other recycled materials to manufacture asphalt pavement. Articles discuss methods used for recycling bituminous pavement including hot-mix and cold-mix. Materials used to improve recycled pavement, and recycled materials used in asphalt pavement include latexes, rubber scrap such as tires, glass shards, concretes, dusts, waste oils, roofing wastes, sulfur, and metal refining sludges. Testing and evaluation of recycled pavements both in laboratories and in test cases are considered. (Contains a minimum of 160 citations and includes a subject term index and title list.)

Not Available

1994-05-01

420

Gantry robot with extended workspace for pavement sign painting operations  

Microsoft Academic Search

The current method for pavement sign marking operations is labor-intensive and very dangerous due to the exposure of workers\\u000a to passing traffic. It also requires blocking traffic for a long period of time resulting serious traffic jam. This paper\\u000a deals with the development of a robotic system for automating the pavement sign painting operations. The robotic system consists\\u000a of gantry

Daehie Hong; Woo-Chang Lee; Baeksuk Chu; Tae-Hyung Kim; Woo Chun Choi

2005-01-01

421

Preventive Maintenance Condition Standards of Expressway Asphalt Pavement  

Microsoft Academic Search

There isn't a unified pavement preventive maintenance road condition standard both at home and abroad till now, in view of that, macro and micro road condition standard for expressway asphalt pavement preventive maintenance is established, among which macro standard is under the promise of PSSIges83, and is under the control standard of 82lesPCI<88, 88lesRQI<93, 85lesSRI<90. Its determinative process, the usage

Hu Guoxiang; Li Jie

2009-01-01

422

Tolerable Strains for HMA Overlays over Concrete Pavements  

E-print Network

Tolerable Strains for HMA Overlays over Concrete Pavements By Ashwani Gautam Submitted to the graduate degree program in Civil Engineering and the Graduate Faculty of the University of Kansas School of Engineering in partial fulfillment.../23/09 ii The Thesis Committee for Ashwani Gautam certifies That this is the approved version of the following thesis: Tolerable Strains for HMA Overlays over Concrete Pavements Committee: _______________________ Dr. Jie Han, Chairperson...

Gautam, Ashwani

2009-06-10

423

Rehabilitation of continuously reinforced concrete pavements using overlays  

E-print Network

REHABILITATION OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS USING OVERLAYS A Thesis by SOUMYA SRIRAMAN Submitted to the Graduate College of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... August 1993 Major Subject: Civil Engineering REHABILITATION OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS USING OVERLAYS A Thesis by SOUMYA SRIRAMAN Submitted to Texas A&M University in partial fulfillment of the requirements for the degree...

Sriraman, Soumya

1993-01-01

424

Minimizing Distress on Flexible Pavements Using Variable Tire Pressure  

Microsoft Academic Search

The potential of variable tire pressure technology to minimize distress on flexible pavements with thin asphalt surfacing layers and peat soil subgrade was evaluated using in-situ stress-strain data. Pavement interfacial strains and corresponding subgrade stresses imposed by a three-axle truck were measured and used to estimate the fatigue life of the surfacing layer. Three levels of truck wheel loads in

Philip M. O. Owende; Anton M. Hartman; Shane M. Ward; Michael D. Gilchrist; Michael J. O'Mahony

2001-01-01

425

Pavement rehabilitation and funds allocation for a transportation network  

E-print Network

Function of Current Serviceability Index. . . . . . . . . . . 47 16 Gain in PES Components for the Various Maintenance Strategies. . . . . . . . . . 17 Minimum Acceptable PES (PSM). 18 Recommended Minimum Allowable Time (TMINI ) Until Next Application... Mix Pavement, Normal Traffic Load. 92 17 Rehabilitation Cycle for Hot Mix Pavement, Double Traffic Load 93 18 Rehabilitation Cycle for Overlays, Half Traffic Load 94 19 Rehabilitation Cycle for Overlays, Normal Traffic Load 95 LIST OF FIGURES...

Stein, Alvaro

2012-06-07

426

Cloud Impacts on Pavement Temperature in Energy Balance Models  

NASA Astrophysics Data System (ADS)

Forecast systems provide decision support for end-users ranging from the solar energy industry to municipalities concerned with road safety. Pavement temperature is an important variable when considering vehicle response to various weather conditions. A complex, yet direct relationship exists between tire and pavement temperatures. Literature has shown that as tire temperature increases, friction decreases which affects vehicle performance. Many forecast systems suffer from inaccurate radiation forecasts resulting in part from the inability to model different types of clouds and their influence on radiation. This research focused on forecast improvement by determining how cloud type impacts the amount of shortwave radiation reaching the surface and subsequent pavement temperatures. The study region was the Great Plains where surface solar radiation data were obtained from the High Plains Regional Climate Center's Automated Weather Data Network stations. Road pavement temperature data were obtained from the Meteorological Assimilation Data Ingest System. Cloud properties and radiative transfer quantities were obtained from the Clouds and Earth's Radiant Energy System mission via Aqua and Terra Moderate Resolution Imaging Spectroradiometer satellite products. An additional cloud data set was incorporated from the Naval Research Laboratory Cloud Classification algorithm. Statistical analyses using a modified nearest neighbor approach were first performed relating shortwave radiation variability with road pavement temperature fluctuations. Then statistical associations were determined between the shortwave radiation and cloud property data sets. Preliminary results suggest that substantial pavement forecasting improvement is possible with the inclusion of cloud-specific information. Future model sensitivity testing seeks to quantify the magnitude of forecast improvement.

Walker, C. L.

2013-12-01

427

Recycling of water-susceptible pavements  

NASA Astrophysics Data System (ADS)

Several bituminous concrete interstate pavements that experienced failures suspected to have been caused by stripping were investigated. On two projects, the degree of deterioration, potential serviceability, and possible remedial measures were studied. Cores were taken to determine the degreee of stripping and tensile strength, and dynaflect tests were performed. An emulsion mix design was developed for stripped bituminous concrete removed from another project with the expectation that it could be used as a surface mix on a highway with a low traffic volume. While this expectation was not realized, it was concluded that the material is suitable for use in a base mix. A maintenance resurfacing on a fourth project that experienced stripping failure is being monitored and the performance is being evaluated.

Maupin, G. W.

1980-05-01

428

Experimental Study on Geocell-Reinforced Flexible Pavements with Recycled Asphalt Pavement (RAP) Bases under Cyclic Loading  

E-print Network

, it is estimated that U. S. production of asphalt pavement materials is around 500 million tons per years, including about 60 million tons of RAP - which transportation agencies reuse or recycle directly into pavements. In addition, agencies reuse or recycle... efforts to recover and reuse old asphalt paving materials in road construction were made in Nevada and Texas in 1974. RAP has been mostly used in hot or cold mix asphalt with virgin asphalt binder and aggregate. In addition, RAP has been used...

Acharya, Bhagaban

2011-12-31

429

Performance of Multiple Corrosion Protection Systems for Reinforced Concrete Bridge Decks  

E-print Network

between concrete cover, bar diameter, and area of bar corroding, and the corrosion loss required to crack concrete. An analysis of pore solutions expressed from cement pastes containing corrosion inhibitors is performed, with pH and selected ion...

O'Reilly, Matt

2011-01-18

430

Bridge Deck Evaluation with Ground Penetrating Radar Dryver Huston, Jing Hu, Noel Pelczarski, and Brian Esser  

E-print Network

electromagnetic (EM) waves to identify underlying features in solid structures. The typical technique uses Health Monitoring Stanford University September 1999 ABSTRACT Ground Penetrating Radar (GPR) uses-frequency (0.5 to 6.0 GHz) antenna is used as the source and receiver. A network analyzer powers the antenna

Huston, Dryver R.

431

Evaluation of Multiple Corrrosion Protection Systems and Corrosion Inhibitors for Reinforced Concrete Bridge Decks  

E-print Network

....................................................................43 CHAPTER 2 – EXPERIMENTAL WORK .........................................................45 2.1 CORROSION PROTECTION SYSTEMS ............................................45 2.2 RAPID MACROCELL TEST... xiv L IST OF FIGURES Figure 1.1 – Mechanism of interaction between carbonation and chloride penetration ................................................................................................................. 9 F i g ure 2...

Xing, Lihua

2010-05-10

432

Charleson et al. BEllAVIOUR OF A MODEL CONCRETE BRIDGE DECK  

E-print Network

. Optical fibre sensors as well as conventional electric resistance strain gauges were used to monitor conducted at the University ofManitoba. The strain distribution in the CFRP reinforcement was monitored using optical fibre sensors as well as electrical strain gauges attached to the surface

433

78 FR 26847 - Including Specific Pavement Types in Federal-aid Highway Traffic Noise Analyses  

Federal Register 2010, 2011, 2012, 2013

...three pavement types: dense-graded asphaltic concrete (DGAC), open-graded asphaltic concrete (OGAC), and Portland cement concrete (PCC). Prediction of future noise levels is based on the ``average'' pavement type, calculated as the...

2013-05-08

434

POROUS PAVEMENT PHASE I DESIGN AND OPERATIONAL CRITERIA (EPA/600/2-80/135)  

EPA Science Inventory

Design and operational criteria, utilization concepts, benefits and disadvantages, as well as other characteristics of porous pavements are presented in this report. Particular emphasis is placed on porous asphalt pavements, but the criteria and design approach are applicable to ...

435

Determination of the Presence Conditions of Pavement Markings using Image Processing  

E-print Network

Pavement markings, as a form of traffic control devices, play a crucial role in safely guiding drivers. Restriping pavement markings is an important task in the maintenance of traffic control devices. Every year state agencies spend a lot of money...

Ge, Hancheng

2012-10-19

436

Robotics and Automation for Flight Deck Aircraft Servicing  

SciTech Connect

One of the missions of the Future Aircraft Carriers Program is to investigate methods that would improve aircraft turnaround servicing activities on carrier decks. The major objectives and criteria for evaluating alternative aircraft servicing methods are to reduce workload requirements, turnaround times (TAT), and life-cycle costs (LCC). Technologies in the field of Robotics and Automation (R and A) have the potential to significantly contribute to these objectives. The objective of this study was to investigate aircraft servicing functions on carrier decks which would offer the potentially most significant payoff if improved by various R and A technologies. Improvement in this case means reducing workload, time and LCC. This objective was accomplished using a ''bottom-up'' formalized approach as described in the following.

Chesser, J.B.; Draper, J.V.; Pin, F.G.

1999-03-01

437

Analysis of aggregate imaging system (AIMS) measurements and their relationship to asphalt pavement skid resistance  

E-print Network

) ........................................................9 2.3 Schematic of Hysteresis and Adhesive Forces Acting on Tire-Pavement Interface (Bazlamit and Reza 2005)..............................................................10 2.4 Aggregate Methods for Providing Pavement Texture (Dahir 1979... forces combine to give a pavement its skid resistance, hysteresis and adhesion. These forces are the result of interaction between the different texture scales on the pavement surface and the tire. Figure 2.3, from Bazlamit and Reza (2005), shows...

Luce, Anthony David

2009-05-15

438

PBF Cooling Tower. Hot deck of Cooling Tower with fan ...  

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

PBF Cooling Tower. Hot deck of Cooling Tower with fan motors in place. Fan's propeller blades (not in view) rotate within lower portion of vents. Inlet pipe is a left of view. Contractor's construction buildings in view to right. Photographer: Larry Page. Date: June 30, 1969. INEEL negative no. 69-3781 - Idaho National Engineering Laboratory, SPERT-I & Power Burst Facility Area, Scoville, Butte County, ID

439

General view of the flight deck of the Orbiter Discovery ...  

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

General view of the flight deck of the Orbiter Discovery looking from a low angle up and aft from approximately behind the commander's station. In the view you can see the overhead aft observation windows, the payload operations work area and in this view the payload bay observation windows have protective covers on them. This view was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

440

General view of the flight deck of the Orbiter Discovery ...  

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

General view of the flight deck of the Orbiter Discovery looking forward from behind the commander's seat looking towards the pilot's station. Note the numerous Velcro pads located throughout the crew compartment, used to secure frequently used items when in zero gravity. This image was taken at Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

441

Looking east along the operating deck above the intake toward ...  

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

Looking east along the operating deck above the intake toward the Main Control Room. An evaporative-cooling system is to the left of the Control Room, and a motor-operated, geared trolly hoist and rake for removing debris from the trash rack is in the foreground - Wellton-Mohawk Irrigation System, Pumping Plant No. 1, Bounded by Gila River & Union Pacific Railroad, Wellton, Yuma County, AZ

442

Astronaut Susan Helms on aft flight deck with RMS controls  

NASA Technical Reports Server (NTRS)

On the Space Shuttle Discovery's aft flight deck, astronaut Susan J. Helms handles controls for the Remote Manipulator System (RMS). The robot arm operated by Helms, who remained inside the cabin, was used to support task such as the release and retrieval of the free-flying Shuttle Pointed Autonomous Research Tool for Astronomy (SPARTAN) - 201, a six-hour space walk and the Shuttle Plume Impingement Flight Experiment (SPIFEX).

1994-01-01

443

Astronauts Hoffman and Musgrave pose in aft flight deck  

NASA Technical Reports Server (NTRS)

Two of Endeavour's busy team of astronauts share a rare moment of leisure in the aft flight deck captured by an Electronic Still Camera (ESC). Astronauts Jeffrey A. Hoffman, left, and F. Story Musgrave also are sharing three of the mission's five planned sessions of extravehicular activity (EVA). Electronic still photography is a technology which provides the means for a handheld camera to electronically capture and digitize an image with resolution approaching film quality.

1993-01-01

444

Relating tensile, bending, and shear test data of asphalt binders to pavement performance  

Microsoft Academic Search

Eight different asphalt binders representing a wide range of applications for pavement construction were tested in uniaxial tension, bending, and shear stresses. Theoretical analyses were performed in this study to convert the data from the three engineering tests to stiffness moduli for predicting pavement performance. At low temperatures, high asphalt stiffness may induce pavement thermal cracking; thus, the allowable maximum

J.-S. Chen; C.-J. Tsai

1998-01-01

445

FIELD AND COMPUTER SIMULATION EXPERIMENTS ON THE FORMATION OF DESERT PAVEMENT  

E-print Network

FIELD AND COMPUTER SIMULATION EXPERIMENTS ON THE FORMATION OF DESERT PAVEMENT JOHN WAINWRIGHT1), to observe the speed at which desert pavement surfaces could be re-established following disturbance erosion processes. Copyright # 1999 John Wiley & Sons, Ltd. KEY WORDS: raindrop erosion; desert pavement

Ahmad, Sajjad

446

Evaluation of infiltration in layered pavements using surface GPR reflection techniques  

E-print Network

Evaluation of infiltration in layered pavements using surface GPR reflection techniques K. Grotea The bearing capacity of sub-asphalt soils, which is a critical parameter for assessing pavement conditions and guiding pavement maintenance, is greatly influenced by soil water content. In this study, ground

Hubbard, Susan

447

ROUGH THIN PAVEMENT THICKNESS ESTIMATION BY GPR N. Pinel, L. Liu, C. Bourlier, Y. Wang  

E-print Network

ROUGH THIN PAVEMENT THICKNESS ESTIMATION BY GPR N. Pinel, L. Liu, C. Bourlier, Y. Wang IREENA pavements consider flat interfaces for simpli- fication. In this paper, the roughness of the surfaces is taken into account. First, the amplitudes of the first two echoes from the rough thin pavement

Paris-Sud XI, Université de

448

PAVEMENT PREDICTION PERFORMANCE MODELS AND RELATION WITH TRAFFIC FATALITIES AND INJURIES  

E-print Network

PAVEMENT PREDICTION PERFORMANCE MODELS AND RELATION WITH TRAFFIC FATALITIES AND INJURIES V. CEREZO.gothie@developpement-durable.gouv.fr ABSTRACT This paper presents some results of a study, which aimed at modelling pavement evolution, pavement characteristics and age. In a second part, non-linear regressions were used in view of obtaining

Boyer, Edmond

449

EVALUATION OF THE PAVEMENT STRUCTURAL CONDITION AT NETWORK LEVEL USING FALLING WEIGHT  

E-print Network

EVALUATION OF THE PAVEMENT STRUCTURAL CONDITION AT NETWORK LEVEL USING FALLING WEIGHT DEFLECTOMETER agencies to improve the surface condition of pavements, but these measures have not successfully prevented the problem from reoccurring. As a result, the overall pavement condition keeps deteriorating because

Manuel, Lance

450

FRP Dowels for Concrete Pavements Darren Eddie, Junior Structural Engineer, Reid Crowther & Partners;  

E-print Network

= L FRP Dowels for Concrete Pavements By Darren Eddie, Junior Structural Engineer, Reid Crowther - Introduction Joints are used in concrete pavements in order to control cracking due to thermal pavements due to the expansion of steel during the corrosion process. This expansion can create large

451

of Transportation Rigid Pavement Design and Analysis Web-Based Training Site  

E-print Network

Texas Department of Transportation Rigid Pavement Design and Analysis Web-Based Training Site Highway Administration Texas Department of Transportation, 2004 Rigid Pavement Design and Analysis Web for six computer programs pertaining mainly to the design and analysis of rigid pavements. The programs

Texas at Austin, University of

452

A four-point bending test for the bonding evaluation of composite pavement  

E-print Network

A four-point bending test for the bonding evaluation of composite pavement M. Hun1 , A. Chabot1 , F investigate the crack initiation and propagation at the interface between layers of composite pavements affects the durability of composite pavements made with asphalt and cement materials. Two main problems

Paris-Sud XI, Université de

453

FREE-FORM ANISOTROPY: A NEW METHOD FOR CRACK DETECTION ON PAVEMENT SURFACE IMAGES  

E-print Network

FREE-FORM ANISOTROPY: A NEW METHOD FOR CRACK DETECTION ON PAVEMENT SURFACE IMAGES Tien Sy NGUYEN(1, in the segmentation step, for crack detection on road pavement images. Features which are calculated along every free on some samples of different kinds of pavements. Results of the method are also given on other kinds

Paris-Sud XI, Université de

454

Viscoelastic functionally graded finite element method with recursive time integration and applications to flexible pavements  

E-print Network

and applications to flexible pavements Eshan V. Dave1,,,, Glaucio H. Paulino2,§ and William G. Buttlar2,¶, 1 for modeling geotechnical and pavement structures exhibiting significant non-homogeneity. Property gradients pavements. Investigation of time-dependent behavior combined with functionally graded property gradation can

Paulino, Glaucio H.

455

Concrete Pavement I-285 under 5th runway at Hartsfield Jackson  

E-print Network

Concrete Pavement Sweet as a James Page I-285 under 5th runway at Hartsfield Jackson International Concrete Paving project I-285 East Perimeter Fiscal 2012 GDOT placed 205,704 square yards of RCC Pavement Portland Cement Concrete Pavement State Route 96 Crawford / Peach Counties I-75 Tift County CRC Lane

456

Influences of eolian and pedogenic processes on the origin and evolution of desert pavements  

E-print Network

Influences of eolian and pedogenic processes on the origin and evolution of desert pavements Leslie in the evolution of these pavements. Eolian dust (I) I=leroles mechanical mogmentatloa oIliow rock, providing the source materiaJ for pavements., and (2) accumulates slowly below basaIdc colluvium in Row depressions

Ahmad, Sajjad

457

Evolution of desert pavements and the vesicular layer in soils of the Transantarctic Mountains  

E-print Network

Evolution of desert pavements and the vesicular layer in soils of the Transantarctic Mountains: Desert soils Soil chronosequences Pavement development index Ventifaction Desert varnish Compared to mid-latitude deserts, the properties, formation and evolution of desert pavements and the underlying vesicular layer

Ahmad, Sajjad

458

Advanced Characterisation of Pavement and Soil Engineering Materials Loizos, Scarpas & Al-Qadi (eds)  

E-print Network

1241 Advanced Characterisation of Pavement and Soil Engineering Materials ­ Loizos, Scarpas & Al and economical alternative for the repair of deteriorated pavements, reflective cracking continues to be major approaches have not provided a direct means for the study of crack initiation and propagation in pavements

Paulino, Glaucio H.

459

DETERMINATION OF ENERGY RELEASE RATE FOR A MIXED-MODE DEBONDING TEST FOR "COMPOSITE" PAVEMENTS  

E-print Network

DETERMINATION OF ENERGY RELEASE RATE FOR A MIXED-MODE DEBONDING TEST FOR "COMPOSITE" PAVEMENTS in "composite" pavement consisting of superimposed layers of processed materials (cement concrete and bituminous, mixed-mode test, multiparticle modelling, Dunder, pavement Due to the structural heterogeneity

Boyer, Edmond

460

FILTERING OF ARTIFACTS AND PAVEMENT SEGMENTATION FROM MOBILE Jorge Hernandez and Beatriz Marcotegui  

E-print Network

FILTERING OF ARTIFACTS AND PAVEMENT SEGMENTATION FROM MOBILE LIDAR DATA Jorge Hern the contour between pavements and roads. The method uses a quasi-flat zone algorithm and a region adjacency boundary. Finally, edges with a value compatible with the pavement/road difference (about 14[cm

Cord, Aurélien

461

TRANSPORTATION RESEARCH RECORD 1574 Paper No. 971071 89 Performance of Rigid Pavements  

E-print Network

TRANSPORTATION RESEARCH RECORD 1574 Paper No. 971071 89 Performance of Rigid Pavements Containing designed and constructed rigid pavements containing recycled concrete aggregate (RCA). Success has been project did exhibit significantly more slab cracking in the recycled pavement than in the corresponding

Vandenbossche, Julie M.

462

Pavement Boundary Detection Via Circular Shape Models Bing Ma \\Lambda Sridhar Lakshmanan Alfred O. Hero  

E-print Network

Pavement Boundary Detection Via Circular Shape Models Bing Ma \\Lambda Sridhar Lakshmanan Alfred O bingm@umich.edu lakshman@umich.edu hero@eecs.umich.edu Abstract Automated detection of pavement of art systems for detecting and tracking pavement boundaries use a priori shape models to describe

Hero, Alfred O.

463

EVALUATION OF THE INFLUENCE OF TACK COAT CONSTRUCTION FACTORS ON THE BOND STRENGTH BETWEEN PAVEMENT LAYERS  

E-print Network

EVALUATION OF THE INFLUENCE OF TACK COAT CONSTRUCTION FACTORS ON THE BOND STRENGTH BETWEEN PAVEMENT Evaluation of the Influence of Tack Coat Construction Factors on the Bond Strength between Pavement Layers 7 provided by the tack coat at the interface between pavement layers. These factors included the surface

464

Dynamical Processes on Desert Pavements and the Healing of Surficial Disturbances  

E-print Network

Dynamical Processes on Desert Pavements and the Healing of Surficial Disturbances PETER K. HAFF, California, 92093-0225 Received June 16, 1994 Mature desert pavements are traditionally regarded as hall period on small cleared patches, or plats, on pavement sur- faces in Panamint Valley, California

Ahmad, Sajjad

465

QUANTIFYING THE BENEFITS FOR USING GEOSYNTHETICS IN UNBOUND BASE COURSE OF PAVEMENTS IN HIGH PI CLAYS  

E-print Network

QUANTIFYING THE BENEFITS FOR USING GEOSYNTHETICS IN UNBOUND BASE COURSE OF PAVEMENTS IN HIGH PI CLAYS By: Ranjiv Gupta1 and J. G. Zornberg, Advisor2 ABSTRACT Flexible pavements over high plasticity methodology to do the same. The present study aims at constructing field test sections on actual pavements

Zornberg, Jorge G.

466

Evaluation of the Structure-induced Rolling Resistance (SRR) for pavements including  

E-print Network

Evaluation of the Structure-induced Rolling Resistance (SRR) for pavements including viscoelastic.chupin@ifsttar.fr Abstract: This article addresses the question of whether the viscoelastic behavior of asphalt pavements consumption of road traffic, as compared to non-dissipative pavements. In the context of sustainable

Paris-Sud XI, Université de

467

5-9035-01-P4 4-YEAR PAVEMENT MANAGEMENT PLAN (WITH  

E-print Network

5-9035-01-P4 4-YEAR PAVEMENT MANAGEMENT PLAN (WITH PROPOSITION 12 PROJECTS): ANALYSIS REPORT Implementation of a Web-based GIS System to Provide Information for Pavement Maintenance Decision-Making DECEMBER Table of Contents Section 1. Pavement Management Plan Executive Summary

Texas at Austin, University of

468

Although most Minnesota airports do not have much concrete pavement, the con-  

E-print Network

Although most Minnesota airports do not have much concrete pavement, the con- crete they do have are generally constructed out of concrete that is much thicker. Maintaining any section of pavement, regardless of its size, is important for pre- serving its condition and optimizing pave- ment life. Pavement

Minnesota, University of

469

Use of Falling Weight Deflectometer Data to Quantify the Relative Performance of Reinforced Pavement Sections  

E-print Network

Pavement Sections Joshi, R.V.1 , S.M. ASCE and Zornberg J.G.2 , PhD., P.E, A.M. ASCE 1 Research Assistant in Grimes County, Texas. The pavement involves eight different experimental cross sections including control the flexible pavement to environmental loading. The objective of this paper is to characterize the possible

Zornberg, Jorge G.

470

Do et al. 1 Full Scale Tests for the Assessment of Wear of Pavement Surfaces  

E-print Network

Do et al. 1 Full Scale Tests for the Assessment of Wear of Pavement Surfaces Minh-Tan Do subjected to heavy traffic. Reports can be found in (1)(2). Evolution of pavements during its whole service shown in the figure 2. By this way, during tests on one track, pavement construction can be carried out

Boyer, Edmond

471

Response of desert pavement to seismic shaking, Hector Mine earthquake, California, 1999  

E-print Network

Response of desert pavement to seismic shaking, Hector Mine earthquake, California, 1999 P. K. Haff characteristic surface disturbances on nearby desert pavements. These disturbances included (1) zones of wholesale gravel displacement interspersed with zones of intact pavement, (2) displaced and rotated cobbles

Ahmad, Sajjad

472

Contact based analysis of asphalt pavement with the effect of aggregate angularity  

Microsoft Academic Search

Relating the performance behavior of asphalt pavement with its design parameters may provide the insight information of how to control and improve the quality of asphalt pavement. The relation must be developed in a functional form so the effect of design parameters on the overall stress–strain response of asphalt pavement then can be quantified based on a single-variable perturbation. This

Han Zhu; Julie E. Nodes

2000-01-01

473

Nondestructive pavement evaluation technique using falling weight deflectometer  

SciTech Connect

An analytical method to predict the mechanical properties of a multi-layer pavement structure is presented. The development of the model is based on a modified back calculation model, using a finite circular plate resting on an elastic layered system. The deflection of the pavement under the dynamic action of the falling weight deflectometer (FWD) is taken as a function of the load action and the characteristic strength of the layers comprising the system including the friction between the individual layers. The responses of the pavement during the impact loading of the falling weight are measured and analyzed to predict the stress, strain and coefficient of friction between the layers making the system. The results revealed that the model which incorporates the interface of friction coefficient in the back-analysis technique allows for a more accurate calculation of the mechanical properties of the pavements and thus can be used as a quality control to assess the state of adhesion between the pavement layer system.

Al-Nageim, H.; Al-Hakim, B.; Lesley, L. [John Moores Univ., Liverpool (United Kingdom). School of the Built Environment

1996-11-01

474

Urban evaporation rates for water-permeable pavements.  

PubMed

In urban areas the natural water balance is disturbed. Infiltration and evaporation are reduced, resulting in a high surface runoff and a typical city climate, which can lead to floods and damages. Water-permeable pavements have a high infiltration rate that reduces surface runoff by increasing the groundwater recharge. The high water retention capacity of the street body of up to 51 l/m(2) and its connection via pores to the surface lead to higher evaporation rates than impermeable surfaces. A comparison of these two kinds of pavements shows a 16% increase in evaporation levels of water-permeable pavements. Furthermore, the evaporation from impermeable pavements is linked directly to rain events due to fast-drying surfaces. Water-permeable pavements show a more evenly distributed evaporation after a rain event. Cooling effects by evaporative heat loss can improve the city climate even several days after rain events. On a large scale use, uncomfortable weather like sultriness or dry heat can be prevented and the urban water balance can be attenuated towards the natural. PMID:20818060

Starke, P; Göbel, P; Coldewey, W G

2010-01-01

475

Investigation of factors affecting asphalt pavement recycling and asphalt compatibility  

SciTech Connect

Both economic and environmental factors dictate that asphalt pavement be recycled. Many recycling projects have been completed using a variety of recycling additives, but little work has been done on the physiochemical aspects of pavement recycling. The present exploratory study was undertaken to better define the physiochemical variables of recycling. Objectives of the present study include: (1) to determine if molecular structuring in the asphalt binder could be observed in oxidized (air-aged) asphalt-aggregate briquets, and if so, how was structuring affected during briquits, and if so, how was structuring affected during briquet recycling and (2) to determine if recycling agents penetrate the strongly adsorbed asphalt layer on the aggregate surface. Differences were seen in asphalt component compatibility as judged by the state of peptization parameters. In extreme cases the values of the parameters correlated with properties of asphalts of known compatibility; however, a relationship between the parameters determined on a series of asphalts in pavements was not established. The parameters might be useful in evaluating additives for pavement recycling; however, more systems need to be studied to fully assess their potential usefulness. Finally, the parameters need to be correlated with performance-related measurements such as asphalt rheological and mix properties. Examination of the parameters and their changes on asphalt oxidative aging may also be informative with regard to asphalt durability inasmuch as oxidation-induced changes are a major cause of asphalt pavement failure.

Venable, R.L.; Petersen, J.C.; Robertson, R.E.; Plancher, H.

1983-03-01

476

Astronaut Robert F. Overmyer behind the pilot's seat on the flight deck  

NASA Technical Reports Server (NTRS)

Astronaut Robert F. Overmyer, pilot for STS-5, behind the pilot's seat on the flight deck of the earth-orbiting Shuttle Columbia. His present position is used by crew members for observing and photographing the Earth through the ceiling windows above Overmyer's head. Behind his head is the aft flight deck window for viewing the cargo bay. Overmyer is framed by two of the three seats on the flight deck area.

1993-01-01

477

The Deck effect in piN to pipipiN  

SciTech Connect

Recent high-statistics analyses of the reaction $\\pi p \\to \\pi \\pi \\pi p$ have motivated a reconsideration of the Deck effect which was widely applied to such data in the 1960's and 70's. The Deck effect is essentially kinematic in origin yet considerable subtleties can arise when one attempts to model its contribution to the data. We will discuss previous Deck studies and propose how it may be constrained further than was possible before using the data now available.

Jozef Dudek; Adam Szczepaniak

2005-08-21

478

Hot in-place recycling of asphalt pavements. Master's thesis  

SciTech Connect

The purpose of this report is to identify factors to consider in selecting a hot in-place recycling project for asphalt pavements. This report discusses the different types of recycling processes and several selected hot in-place recycling processes that are becoming so popular today. The types of asphalt pavement distress and their causes are discussed to provide a working knowledge of possible applications for this process. Discussions on project selection, design, and construction considerations will also provide an awareness of considerations relative to this type of asphalt-pavement rehabilitation. An understanding of these topics will be helpful when selecting hot in-place recycling. The information that this report is based upon was obtained from various sources. A literature search included technical reports, periodicals, and advertisements. Personal contact was made in the form of interviews with a number of representatives in the industry and on site inspection of Cutler Repaving, Inc. and Remixer Contracting Co., Inc. operations.

Dowdy, M.L.

1987-08-04

479

International Conference on Advanced Composite Materials in Bridges and Structures Confrence Internationale sur les matriaux composites d'avant-garde pour ponts et charpentes  

E-print Network

the shear loads. The faces are adhesively bonded to the core to create a load transfer mechanism between.1 Background The demand for the development of more efficient and durable bridge and parking decks as well. These conventional structures have been used very widely for #12;2 structural components. However, the durability

480

An algorithm for pavement crack detection based on multiscale space  

NASA Astrophysics Data System (ADS)

Conventional human-visual and manual field pavement crack detection method and approaches are very costly, time-consuming, dangerous, labor-intensive and subjective. They possess various drawbacks such as having a high degree of variability of the measure results, being unable to provide meaningful quantitative information and almost always leading to inconsistencies in crack details over space and across evaluation, and with long-periodic measurement. With the development of the public transportation and the growth of the Material Flow System, the conventional method can far from meet the demands of it, thereby, the automatic pavement state data gathering and data analyzing system come to the focus of the vocation's attention, and developments in computer technology, digital image acquisition, image processing and multi-sensors technology made the system possible, but the complexity of the image processing always made the data processing and data analyzing come to the bottle-neck of the whole system. According to the above description, a robust and high-efficient parallel pavement crack detection algorithm based on Multi-Scale Space is proposed in this paper. The proposed method is based on the facts that: (1) the crack pixels in pavement images are darker than their surroundings and continuous; (2) the threshold values of gray-level pavement images are strongly related with the mean value and standard deviation of the pixel-grey intensities. The Multi-Scale Space method is used to improve the data processing speed and minimize the effectiveness caused by image noise. Experiment results demonstrate that the advantages are remarkable: (1) it can correctly discover tiny cracks, even from very noise pavement image; (2) the efficiency and accuracy of the proposed algorithm are superior; (3) its application-dependent nature can simplify the design of the entire system.

Liu, Xiang-long; Li, Qing-quan

2006-10-01

481

Bridging the Gaps  

NSDL National Science Digital Library

Students are presented with a brief history of bridges as they learn about the three main bridge types: beam, arch and suspension. They are introduced to two natural forces — tension and compression — common to all bridges and structures. Throughout history, and today, bridges are important for connecting people to resources, places and other people. Students become more aware of the variety and value of bridges around us in our everyday lives.

2014-09-18

482

Evaluation of multilayered pavement structures from measurements of surface waves  

USGS Publications Warehouse

A method is presented for evaluating the thickness and stiffness of multilayered pavement structures from guided waves measured at the surface. Data is collected with a light hammer as the source and an accelerometer as receiver, generating a synthetic receiver array. The top layer properties are evaluated with a Lamb wave analysis. Multiple layers are evaluated by matching a theoretical phase velocity spectrum to the measured spectrum. So far the method has been applied to the testing of pavements, but it may also be applicable in other fields such as ultrasonic testing of coated materials. ?? 2006 American Institute of Physics.

Ryden, N.; Lowe, M.J.S.; Cawley, P.; Park, C.B.

2006-01-01

483

Impact of compressed natural gas fueled buses on street pavements  

SciTech Connect

Capital Metro, the Ausin, Texas transit authority, is currently evaluating a number of CNG fueled buses. As part of the U.S. DOT Region Six University Transportation Centers Program (UTCP), a study was instigated into the scale of incremental pavement consumption associated with the operation of these buses. The study suggests that replacing current vehicles with CNG powered models utilizing aluminum storage tanks would raise average network equivalent single rehabilitation costs across the network of over four percent. Finally, it recommends that full cost study be undertaken with evaluation of the adoption of alternative bus fuels - which includes pavement and environmental impacts.

Yang, D.; Harrison, R.

1995-07-01

484

Fatigue properties of rubber modified pavements. Final report  

SciTech Connect

This report presents results of a study to determine the fatigue behavior of rubber modified pavements in Alaska in comparison with conventional asphalt concrete pavements. Laboratory studies were conducted on field specimens using the flexural fatigue test in the controlled-displacement mode. Tests were performed at 72 deg F and 40 deg F. Tested materials include (1) conventional HMA with AC 2.5 and AC 5; (2) PlusRide RUMAC with AC 5; (3) asphalt-rubber concrete with AC 2.5 (wet Process); and (4) rubberized asphalt-rubber concrete with AC 2.5 (wet/dry process).

Raad, L.; Saboundjian, S.; Yuan, X.

1995-05-01

485

Thin, applied surfacing for improving skid resistance of concrete pavements  

NASA Astrophysics Data System (ADS)

The use of select aggregate in a thin wearing surface of portland cement mortar to prolone or restore a concrete pavement's ability to develop high friction was accomplished. Two fine aggregates, blast furnace slag and lightweight expanded shale were found to exhibit skid resistance greater than the other aggregates evaluated. The British polishing wheel was used in the laboratory evaluation of aggregate to simulate wear. The need for a method of restoring friction to a worn, but otherwise sound concrete pavement led to a field evaluation of several different techniques for placing a very thin overlay. The successful method was a broomed, very thin layer of mortar, 3 mm thick.

Scholer, C. F.

1980-12-01

486

Desert pavements and associated rock varnish in the Mojave Desert: How old can they be?  

NASA Astrophysics Data System (ADS)

Desert pavements are common features of arid landscapes and have been widely used as a relative age indicator of the geomorphic surfaces upon which they are developed. In this study I examined the patterns of pavement development as a function of elevation in the Mojave Desert as well as the causes for the gradual disappearance of pavement at high elevations. Pavement density, as measured by percentage of pebble coverage, decreases systematically with elevation gain by ˜3% per 100 m, from 95% coverage below 500 m to less than 60% at 1700 m. Plants appear to be the main agent of pavement disruption; plant density decreases as pavement density increases. Burrowing by rodents and crusting by cryptobiota also disrupt pavement development at higher elevation. During the last glacial maximum, plant communities were displaced 1000 1400 m downward in the Mojave Desert. Pavements today generally do not survive above the blackbush (Coleogyne ramossisma)-sagebrush (Artemisia tridentata) zone. Evidence from packrat middens shows that these and other plants typical of high elevations today grew as low as 300 400 m during the last glacial maximum. I suggest that during the last glacial maximum, desert pavements were confined to the lowest alluvial fans of Death Valley and adjoining low valleys. No alluvial desert pavements above ˜400 m in the region are older than the latest Pleistocene. By the same reasoning, desert varnish on desert pavements above 400 m may all be Holocene in age, except where developed on stable boulders.

Quade, Jay

2001-09-01

487

Functionality enhancement of industrialized optical fiber sensors and system developed for full-scale pavement monitoring.  

PubMed

Pavements always play a predominant role in transportation. Health monitoring of pavements is becoming more and more significant, as frequently suffering from cracks, rutting, and slippage renders them prematurely out of service. Effective and reliable sensing elements are thus in high demand to make prognosis on the mechanical properties and occurrence of damage to pavements. Therefore, in this paper, various types of functionality enhancement of industrialized optical fiber sensors for pavement monitoring are developed, with the corresponding operational principles clarified in theory and the performance double checked by basic experiments. Furthermore, a self-healing optical fiber sensing network system is adopted to accomplish full-scale monitoring of pavements. The application of optical fiber sensors assembly and self-healing network system in pavement has been carried out to validate the feasibility. It has been proved that the research in this article provides a valuable method and meaningful guidance for the integrity monitoring of civil structures, especially pavements. PMID:24854060

Wang, Huaping; Liu, Wanqiu; He, Jianping; Xing, Xiaoying; Cao, Dandan; Gao, Xipeng; Hao, Xiaowei; Cheng, Hongwei; Zhou, Zhi

2014-01-01

488

Flight Deck Weather Avoidance Decision Support: Implementation and Evaluation  

NASA Technical Reports Server (NTRS)

Weather related disruptions account for seventy percent of the delays in the National Airspace System (NAS). A key component in the weather plan of the Next Generation of Air Transportation System (NextGen) is to assimilate observed weather information and probabilistic forecasts into the decision process of flight crews and air traffic controllers. In this research we explore supporting flight crew weather decision making through the development of a flight deck predicted weather display system that utilizes weather predictions generated by ground-based radar. This system integrates and presents this weather information, together with in-flight trajectory modification tools, within a cockpit display of traffic information (CDTI) prototype. that the CDTI features 2D and perspective 3D visualization models of weather. The weather forecast products that we implemented were the Corridor Integrated Weather System (CIWS) and the Convective Weather Avoidance Model (CWAM), both developed by MIT Lincoln Lab. We evaluated the use of CIWS and CWAM for flight deck weather avoidance in two part-task experiments. Experiment 1 compared pilots' en route weather avoidance performance in four weather information conditions that differed in the type and amount of predicted forecast (CIWS current weather only, CIWS current and historical weather, CIWS current and forecast weather, CIWS current and forecast weather and CWAM predictions). Experiment 2 compared the use of perspective 3D and 21/2D presentations of weather for flight deck weather avoidance. Results showed that pilots could take advantage of longer range predicted weather forecasts in performing en route weather avoidance but more research will be needed to determine what combinations of information are optimal and how best to present them.

Wu, Shu-Chieh; Luna, Rocio; Johnson, Walter W.

2013-01-01

489

Enhanced/Synthetic Vision Systems for Advanced Flight Decks  

NASA Technical Reports Server (NTRS)

One of the most challenging arenas for enhanced and synthetic vision systems is the flight deck. Here, pilots must perform active and supervisory control behaviors based on imagery generated in real time or transduced from imaging sensors. Although enhanced and synthetic vision technologies have been used in military vehicles for more than two decades, they have only recently been considered for civilian transport aircraft. In this paper we discuss the human performance issues still to be resolved for these systems, and consider the special constraints that must be considered for their use in the transport domain.

Kaiser, Mary K.; Jenkins, James; Statler, Irving C. (Technical Monitor)

1994-01-01

490

Voice measures of workload in the advanced flight deck  

NASA Technical Reports Server (NTRS)

Voice samples were obtained from 14 male subjects under high and low workload conditions. Acoustical analysis of the voice suggested that high workload conditions can be revealed by their effects on the voice over time. Aircrews in the advanced flight deck will be voicing short, imperative sentences repeatedly. A drop in the energy of the voice, as reflected by reductions in amplitude and frequency over time, and the failure to achieve old amplitude and frequency levels after rest periods, can signal that the workload demands of the situation are straining the speaker. This kind of measurement would be relatively unaffected by individual differences in acoustical measures.

Schneider, Sid J.; Alpert, Murray; Odonnell, Richard

1989-01-01

491

Advanced flight deck/crew station simulator functional requirements  

NASA Technical Reports Server (NTRS)

This report documents a study of flight deck/crew system research facility requirements for investigating issues involved with developing systems, and procedures for interfacing transport aircraft with air traffic control systems planned for 1985 to 2000. Crew system needs of NASA, the U.S. Air Force, and industry were investigated and reported. A matrix of these is included, as are recommended functional requirements and design criteria for simulation facilities in which to conduct this research. Methods of exploiting the commonality and similarity in facilities are identified, and plans for exploiting this in order to reduce implementation costs and allow efficient transfer of experiments from one facility to another are presented.

Wall, R. L.; Tate, J. L.; Moss, M. J.

1980-01-01

492

55. Photocopy of Fcsle & Upper Deck, Booklet of General ...  

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

55. Photocopy of Fcsle & Upper Deck, Booklet of General Plans, U.S.C.G.C. White Heath, WLM-545. U.S. Coast Guard Naval Engineering Department, U.S.C.G. Headquarters, Washington, D.C. Coast Guard Headquarters Drawing No. 540-WAGL-0103-019 C. sheet 5 of 7, dated May 1967; revised June 1971, December 1976, and April 1989. Original drawing property of the U.S. Coast Guard. - U.S. Coast Guard Cutter WHITE HEATH, USGS Integrated Support Command Boston, 427 Commercial Street, Boston, Suffolk County, MA

493

Fatigue evaluation for Tsing Ma Bridge using structural health monitoring data  

NASA Astrophysics Data System (ADS)

Fatigue assessment for the Tsing Ma Bridge (TMB) are presented based on the British standard BS5400 and the real-time structural health monitoring data under railway loading. TMB, as an essential portion of transport network for the Hong Kong airport, is the longest suspension bridge in the world carrying both highway and railway traffic. The bridge design has been mainly based on BS5400. A structural health monitoring system - Wind and Structural Health Monitoring System (WASHMS) for TMB has been operated since the bridge commissioning in May 1997. In order to assess the fatigue behavior of TMB under railway loading, strain gauges were installed on the bridge deck to measure the strain-time histories as soon as the bridge is loaded by a standard railway loading due to the service of an actual train. The strain-time history data at the critical members are then used to determine the stress spectrum, of which the rainflow method recommended for railway bridges by BS5400 is applied to count cycles of stress range. Miner's law is employed to evaluate fatigue damage and remaining service life of the bridge. The evaluated results of fatigue damage and remaining service life would help us to well understand about the fatigue design of the bridge and status in fatigue accumulation.

Chan, Hung-tin Tommy; Ko, Jan Ming; Li, Zhao-Xia

2001-08-01

494

Construction engineering of steel tub-girder bridge systems for skew effects  

NASA Astrophysics Data System (ADS)

Closed structural sections, such as those having circular, rectangular or trapezoidal shape, possess high rotational rigidity when compared to open sections such as I-girders. The high torsional rigidity of closed sections makes them ideal for use in highly curved bridges. In this case, the geometry of the bridge results in large torsional forces. Because of structural efficiency and economy reasons, most of these closed-section bridges consist of a trapezoidal cross-section, with a top concrete slab and bottom and side steel plates. The slab is cast after the steel is erected and thus a system of internal diaphragms and braces is necessary to stabilize the system during erection. During the steel erection and the early stages of the concrete deck placement, the section can be considered as quasi-closed as the top concrete flange has not been cast or is not yet effective. During steel erection, undetermined and/or large torsional forces and/or displacements may result in fit-up problems requiring large stresses to overcome. During concrete deck placement, the undetermined displacements can affect the control of the deck thickness and the final deck geometry, such as the alignment of deck joints and the matching of stages in phased constructions projects. Due to the interactions between their various components, the behavior of curved and skewed tub-girder bridges is significantly more complex than that of straight bridges. When skewed supports are used in tub-girders, the interaction of the girder bending rotations and the displacement constraints induced by the skewed support diaphragms causes twisting of the girders at the supports. These twist rotations introduce additional torques into the system. Both curvature and skew can cause design and construction difficulties, especially at the supports, where the corresponding steel dead load deflections and the large torsional stiffness of the girders may lead to large fit-up forces. Currently, the general understanding of the level of sophistication of analysis models required to properly predict forces and deformations of curved and/or skewed bridges during construction is limited. The development of guidelines regarding the sufficiency of simplified methods of structural analysis is the overall motivation and objective of this dissertation. This research addresses the construction load effects due to skew and due to combined skew and curvature and develops design recommendations and analytical tools for the construction engineering of tub-girder bridges. The effects of skew and curvature are studied by examining the results for different levels of analysis for 18 representative bridges. These bridges reflect the range of bridge curvature and skew used in current practice. By comparing the output from simplified analysis methods to validated refined 3D FEA solutions, general conclusions are developed as to when the simplified methods provide sufficient results. An important original contribution of this research is that the data generated constitutes the first systematic study on a large set of curved and skewed tub-girder bridges using consistent refined 3D FEA models to model construction forces and deformations. As such, the results of this research can serve as a benchmark for current and future improvements in methods of analysis and design for the construction engineering of curved and skewed tub-girder bridges. In the current research, this data has been used in both straight and curved tub-girder bridges to: • Develop a simplified 1D analysis method to account for the effect of skew on girder twist rotations and internal torques, • Evaluate the effect of skew on component forces, and propose improved simplified procedures to capture these effects, • Identify interactions between components and develop improved simplified analysis methods to account for these effects, • Establish limits for when the improved 1D and 2D simplified methods of analysis are sufficient for construction engineering analysis, and • Identify sources of steel erection fit-up proble

Jimenez Chong, Juan Manuel

495

Dynamic monitoring of structural health in cable-supported bridges  

NASA Astrophysics Data System (ADS)

A sophisticated instrumentation system, called Wind and Structural Health Monitoring System (WASHMS), is devised by the Hong Kong Highways Department to monitor the structural health and performance of three long-span cable-supported bridges in Hong Kong. This system consists of about 900 sensors including accelerometers. Strain gauges, displacement transducers, level sensing stations, anemometers, temperature sensors and wight-in-motion sensors. The Hong Kong Polytechnic University is commissioned to investigate the feasibility of using measured dynamic characteristics for structural damage detection in these bridges. Explored in this paper are some key issues related to developing a viable vibration-based damage assessment strategy for these bridges: (a) Evaluation of possible damage likely to occur in the three bridges - the detectibility of damage to structural components by using global or local dynamic characteristics is discussed; (b) Concept and rules of damage detection oriented modeling for large-scale structures - a super-element formulation for complicated two-tier bridge deck is developed within this framework; (c) System identification methodology for heavily redundant structures - a neural network based hierarchical identification strategy is pose for successively detecting the occurrence, type, location and extent of the damage.

Ko, Jan Ming; Ni, Yi-Qing; Chan, Hung-tin Tommy

1999-05-01

496

Impacts of Optimized Cold & Hot Deck Reset Schedules on Dual Duct VAV Systems - Theory and Model Simulation  

E-print Network

Optimal hot and cold deck reset schedules can decrease simultaneous heating and cooling in VAV AHUs comparing with constant cold deck temperature operation. In this paper, optimization models are developed. The energy impacts are simulated for a...

Liu, M.; Claridge, D. E.

1998-01-01

497

STS-30 MS Lee, wearing sunglasses, uses 70mm camera on aft flight deck  

NASA Technical Reports Server (NTRS)

STS-30 Atlantis, Orbiter Vehicle (OV) 104, Mission Specialist (MS) Mark C. Lee, wearing sunglasses and light blue flight coveralls, holds a 70mm camera on aft flight deck. Lee prepares to take pictures of the Earth surface outside overhead window W8. Aft flight deck viewing window W10 and onorbit station control panels appear behind him.

1989-01-01

498

STS-56 Commander Cameron with camera stowage bag on OV-103's flight deck  

NASA Technical Reports Server (NTRS)

STS-56 Commander Kenneth Cameron, with a penlight flashlight velcroed to his headband, prepares to open a camera stowage bag on the forward flight deck of Discovery, Orbiter Vehicle (OV) 103. Behind him are the forward flight deck windows, forward control panels, and the commanders and pilots seatbacks.

1993-01-01

499

STS-32 Commander Brandenstein displays birthday card on OV-102's flight deck  

NASA Technical Reports Server (NTRS)

STS-32 Commander Daniel C. Brandenstein, sitting at the commanders station, displays his birthday card on Columbia's, Orbiter Vehicle (OV) 102's, flight deck. Appearing around Brandenstein are the forward flight deck control panels, forward windows, commanders seatback, and a 'GO NAVY' decal attached to panel O1.

1990-01-01

500

STS-37 Commander Nagel in commanders seat on OV-104's flight deck  

NASA Technical Reports Server (NTRS)

STS-37 Commander Steven R. Nagel, wearing launch and entry suit (LES), sits at commanders station on the forward flight deck of Atlantis, Orbiter Vehicle (OV) 104. Surrounding Nagel are the seat headrest, control panels, checklists, forward flight deck windows, and three drinking water containers with straws attached to forward panel F2.

1991-01-01