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Evaluation Of Bridge Approach Rails
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Book Synopsis Evaluation of Bridge Approach Rails by : Roger P. Bligh
Download or read book Evaluation of Bridge Approach Rails written by Roger P. Bligh and published by . This book was released on 1992 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recent study on the performance of guardrail-to-bridge rail transitions revealed that many widely used designs do not meet current safety standards. As a result, the Federal Highway Administration (FHWA) requested that the Arizona Department of Transportation verify the safety performance of its standard transition designs. Three transition designs currently being used by ADOT were evaluated through a combined program of computer simulation and full-scale crash testing. The standard ADOT wood post transition, incorporating a channel rubrail and two different sizes of timber posts at a reduced post spacing near the bridge rail end, was found to be in compliance with National Cooperative Highway Research Program (NCHRP) Report 230 performance criteria. The standard ADOT steel post transition with channel rubrail was also found to be in compliance with NCHRP Report 230 requirements when impacted near the end of the bridge rail. However, the upstream end of the steel post transition required modification to eliminate deficiencies identified during testing. The modified design, which terminated the channel rubrail behind a W6x9 guardrail post, was successfully crash tested. A recent study on the performance of guardrail-to-bridge rail transitions revealed that many widely used designs do not meet current safety standards. As a result, the Federal Highway Administration (FHWA) requested that the Arizona Department of Transportation verify the safety performance of its standard transition designs. Three transition designs currently being used by ADOT were evaluated through a combined program of computer simulation and full-scale crash testing. The standard ADOT wood post transition, incorporating a channel rubrail and two different sizes of timber posts at a reduced post spacing near the bridge rail end, was found to be in compliance with National Cooperative Highway Research Program (NCHRP) Report 230 performance criteria. The standard ADOT steel post transition with channel rubrail was also found to be in compliance with NCHRP Report 230 requirements when impacted near the end of the bridge rail. However, the upstream end of the steel post transition required modification to eliminate deficiencies identified during testing. The modified design, which terminated the channel rubrail behind a W6x9 guardrail post, was successfully crash tested.
Book Synopsis Evaluation of Bridge Approach Settlement Mitigation Methods by : Sam Helwany
Download or read book Evaluation of Bridge Approach Settlement Mitigation Methods written by Sam Helwany and published by . This book was released on 2007 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Bridge Approaches by :
Download or read book Performance Evaluation of Bridge Approaches written by and published by . This book was released on 1983 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Evaluation of Texas Bridge Rails to Contain Buses and Trucks by : Teddy James Hirsch
Download or read book Analytical Evaluation of Texas Bridge Rails to Contain Buses and Trucks written by Teddy James Hirsch and published by . This book was released on 1978 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Guardrail to Concrete Bridge Rail Transitions by : Roger P. Bligh
Download or read book Evaluation of Guardrail to Concrete Bridge Rail Transitions written by Roger P. Bligh and published by . This book was released on 2003 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 2001, the Design Division and Bridge Division of Texas Department of Transportation released a new standard for an approach guardfence to concrete bridge rail transition that complies with the testing requirements of National Cooperative Highway Research Program (NCHRP) Report 350 for use on high-speed roadways. The purpose of this research was to develop a transition that is suitable for use on lower speed roadways and that is less expensive and complex than the current high-speed design. A low-cost transition was successfully evaluated at 45 mph impact speeds under NCHRP Report 350 Test Level 2 conditions. A second objective of the project was to evaluate the need for the curb detail that is one of the design elements of the newly adopted thrie beam transition design. Elimination of the curb would greatly enhance installation flexibility and reduce installation cost. The assessment of the curb was accomplished through full-scale crash testing.
Book Synopsis A Method of Field Evaluation of Narrow Bridges for Priority Indexing by : Thomas M. Newton
Download or read book A Method of Field Evaluation of Narrow Bridges for Priority Indexing written by Thomas M. Newton and published by . This book was released on 1979 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Testing and Evaluation of Bridge Rail Concept by : Teddy James Hirsch
Download or read book Testing and Evaluation of Bridge Rail Concept written by Teddy James Hirsch and published by . This book was released on 1975 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Structural Performance of Bridge Approach Slabs by : Stanley Y. T. Chen
Download or read book Evaluation of Structural Performance of Bridge Approach Slabs written by Stanley Y. T. Chen and published by . This book was released on 2010 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Low-profile Bridge Rail for Test Level 2 Applications by :
Download or read book Development of a Low-profile Bridge Rail for Test Level 2 Applications written by and published by . This book was released on 2002 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A low-profile bridge rail was developed for installations where pedestrians and/or site restrictions prevent the use of conventional bridge rails with transitions. The bridge rail design was constructed using a 22.86-m long reinforced concrete parapet.
Book Synopsis Evaluation of Bridge Approach Roughness by : B. F. Neal
Download or read book Evaluation of Bridge Approach Roughness written by B. F. Neal and published by . This book was released on 1973 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Bridge Approach Slab Effectiveness by : Peter Sajer
Download or read book Evaluation of Bridge Approach Slab Effectiveness written by Peter Sajer and published by . This book was released on 1990 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :California. Division of Highways. Materials and Research Department Publisher : ISBN 13 : Total Pages :102 pages Book Rating :4.:/5 (1 download)
Book Synopsis Full Scale Tests of Concrete Bridge Rails Subjected to Automobile Impacts by : California. Division of Highways. Materials and Research Department
Download or read book Full Scale Tests of Concrete Bridge Rails Subjected to Automobile Impacts written by California. Division of Highways. Materials and Research Department and published by . This book was released on 1956 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Testing and Evaluation of the Florida Jersey Safety Shaped Bridge Rail by :
Download or read book Testing and Evaluation of the Florida Jersey Safety Shaped Bridge Rail written by and published by . This book was released on 2004 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this portion of the project were to: 1) determine if any or all of the three subject variants of the 32-inch (813 mm) Jersey safety shaped bridge railing comply with the requirements of the AASHTO LRFD Bridge Design Specifications and National Cooperative Highway Research Program (NCHRP) Report 350 Test Level 4 (TL4), and 2) provide recommended retrofit schemes, if deemed technically and economically feasible, to bring into compliance the railings that do not comply. Full or partial replacement schemes may also be recommended as appropriate. The most direct approach for accomplishing the objectives of this task was to perform a full-scale crash test of the most critical design. If that railing performed satisfactorily, the railing would be acceptable by AASHTO LRFD Specifications. The strength test was selected, NCHRP Report 350 test 4-12, a single-unit van-type truck weighing 17,6211b (8000 kg). The TL-4 vehicle is a single-unit box-van truck impacting the railing at 15 degrees and 49.7 mi/h (80 kmIh). While containment is required, overturning of the vehicle is an acceptable test outcome. However, Test Level 3 (TL-3) is a 4405-lb (2000 kg) pickup impacting the railing at 25 degrees and 62.2 mi/h (l00 kmIh). This test requires both containment and stability, and non-overturning. Since some breakage of the parapet is possible, potential for vehicle snagging is likely. Vehicle snagging can contribute to vehicle instabilities in the redirection sequence and potential rollover. Therefore, researchers chose both TL-4 and TL-3 tests. According to the results of this project, no field retrofits or replacements of the Florida Jersey safety shaped bridge rails, depicted in the Florida DOT Index 799, are warranted since the most critical 32-inch (813 mm) Jersey safety shaped bridge railing complied with the requirements of the AASHTO LRFD Bridge Design Specifications and NCHRP Report 350 Test Levels 3 and 4.
Book Synopsis Evaluation of Bridge Rail Systems to Confirm AASHTO MASH Compliance by : William F. Williams (Transportation engineer)
Download or read book Evaluation of Bridge Rail Systems to Confirm AASHTO MASH Compliance written by William F. Williams (Transportation engineer) and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Rail Designs and Performance Standards: Research report by :
Download or read book Bridge Rail Designs and Performance Standards: Research report written by and published by . This book was released on 1987 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This project evaluated bridge railings. State bridge rail designs submitted to the Federal Highway Administration (FHWA) were rated and the best of each type were selected for crash test evaluation. When necessary, the designs were improved and retested. Most of the crash tests were conducted with 4500-lb (2025-kg) cars at 60 mph (95 km/h) and a 25-degree angle and 1800-lb (800-kg) cars at 60 mph (95 km/h) and a 20-degree angle. Performance standards are proposed in 1986 are presented, along with bridge railing geometric design considerations to minimize vehicle snagging. Design drawings of the successfully tested bridge rails are included"--Technical report documentation page
Book Synopsis Test Level 4 Evaluation of the Minnesota Combination Bridge Rail by :
Download or read book Test Level 4 Evaluation of the Minnesota Combination Bridge Rail written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A safety performance evaluation of the Minnesota concrete parapet with brush curb and metal rail (Minnesota Combination Bridge Rail) was conducted for the Minnesota Department of Transportation (Mn/DOT) as part of Year 4 of the Midwest States Regional Pooled Fund Program. The safety performance evaluation of this bridge rail system was conducted and reported according to the criteria specified in Test Level 4 of the National Cooperative Highway Research Program (NCHRP) Report No. 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features". This testing involved impacts with an 8000-kg single-unit truck, a 2000-kg pickup truck, and an 820-kg small car. The bridge rail design was modified following the 2000-kg pickup truck test in order to reduce the potential for snagging. After this modification was made, and the system was retested, the safety performance of this system was found to be acceptable and meets the safety standards set forth in Test Level 4 of NCHRP 350
Book Synopsis Performance Evaluation of the Modified T77 Bridge Rail by : Delbert Lance Bullard
Download or read book Performance Evaluation of the Modified T77 Bridge Rail written by Delbert Lance Bullard and published by . This book was released on 2004 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
