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Evaluation Of Bridge Rail Systems To Confirm Aashto Mash Compliance
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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 Evaluation of Four Bridge Rail Systems for Compliance with the 2016 Edition of Manual for Assessing Safety Hardware (MASH) by : Hongbing Fang
Download or read book Evaluation of Four Bridge Rail Systems for Compliance with the 2016 Edition of Manual for Assessing Safety Hardware (MASH) written by Hongbing Fang and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crash Test and Evaluation of the TxDOT T224 Bridge Rail by :
Download or read book Crash Test and Evaluation of the TxDOT T224 Bridge Rail written by and published by . This book was released on 2018 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of thei research was to evaluate the impact performance of the TxDOT T224 Bridge Rail according to the safety performance evaluation guidelines included in AASHTO MASH for test level five (TL 5). This report describes the TxDOT T224 Bridge Rail, documents the impact performance of the rail system according to MASH TL-5 evaluation criteria, and presents recommendations regarding implementation.
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 Development of a MASH Test Level 4 Open Concrete Bridge Rail by : Jacob DeLone
Download or read book Development of a MASH Test Level 4 Open Concrete Bridge Rail written by Jacob DeLone and published by . This book was released on 2020 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: An open concrete bridge rail was designed and developed according to safety performance guidelines in the American Association of State Highway Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH) for Test Level 4 (TL-4). Systems designed and developed under previous guidance were studied, and their geometric information and full-scale crash testing performance was studied to establish the geometry of the new bridge rail. Yield-Line Theory and the AASHTO Post and Beam design methods were studied, and a modified version of the AASHTO Post and Beam method was utilized to determine the capacity of the new open concrete bridge rail. Both 36 and 39-in. (914 and 991-mm) tall variants of the new open concrete bridge rail were configured. Both variants incorporated a 27-in. (686-mm) tall by 14-in. (356-mm) wide rail, supported by 36-in. (914-mm) long x 10 in. (254-mm) wide posts in the interior region, and 72-in. (1,829-mm) long posts in the end region. Posts in both regions were separated by a 72-in. (1,829-mm) long gap. Posts in the 36 in. (914 mm) tall variant were 9 in. (229 mm) tall, and posts in the 39-in. (991-mm) tall variant were 12 in. (305 mm) tall. Three bridge deck reinforcement configurations were developed to provide different options of reinforcement patterns that were compatible with the new bridge rail. Three concrete end buttress configurations, each with three different approach guardrail transition (AGT) options, were proposed to provide examples of how to properly transition from guardrails installed off the bridge to the open concrete bridge rail. Three full-scale crash tests were recommended to be conducted under MASH test designation nos. 4-10 through 4-12, with 2,425 lb (1,100 kg), 5,000 lb (2,270 kg), and 22,000 lb (10,000 kg) vehicles to evaluate the safety performance of the open concrete bridge rail.
Book Synopsis MASH TL-3 Evaluation of 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition by : William F. Williams (Transportation engineer)
Download or read book MASH TL-3 Evaluation of 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition written by William F. Williams (Transportation engineer) and published by . This book was released on 2020 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the tests reported herein was to assess the performance of the 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition according to the safety-performance evaluation guidelines included in AASHTO MASH. The crash tests were performed in accordance with MASH TL-3, which involves two full-scale crash tests (MASH Tests 3-20 and 3-21). However, MASH states that when there are transitions between two barrier types with different stiffness, one from a more flexible barrier and the other to a more rigid barrier, a full-scale crash test is recommended for both types. Therefore, MASH Test 3-21 was performed at the transition from the thrie beam rail to bridge rail, and at the transition from the W-beam rail to thrie beam rail. This report provides details of the 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition, detailed documentation of the crash tests and results, and an assessment of the performance of the 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition for MASH TL-3 transition evaluation criteria. The 2019 MASH 2-Tube Bridge Rail Thrie Beam Transition performed acceptably for MASH TL-3 transitions.
Book Synopsis MASH TL-4 Evauation of the TxDOT Type C2P Bridge Rail by : William F. Williams (Transportation engineer)
Download or read book MASH TL-4 Evauation of the TxDOT Type C2P Bridge Rail 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: The objective of this research was to evaluate the impact performance of the Texas Department of Transportation (TxDOT) Type C2P Bridge Rail according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH) for Test Level Four (TL-4). This report describes the TxDOT Type C2P Bridge Rail, documents the impact performance of the bridge rail system according to MASH TL-4 evaluation criteria for longitudinal barriers, and presents recommendations regarding implementation. MASH Tests 4-10 and 4-11 evaluate a barrier's ability to successfully contain and redirect passenger vehicles and evaluate occupant risk. MASH Test 4-12 evaluates the structural adequacy of the bridge rail. All three tests were performed on the TxDOT Type C2P Bridge Rail. For Test 4-12, the post welds were not properly fabricated according to the project design drawings. As a result, some post welds in the immediate impact area did rupture from the MASH Test 4-12 truck impact. These ruptured post welds did aggravate the stability of the single unit truck during the test. For subsequent tests, the posts were welded correctly as per the project drawings. The bridge rail posts, with the correct post welds, should only improve the performance of the single unit truck. The TxDOT Type C2P Bridge Rail performed acceptably for MASH TL-4.
Book Synopsis MASH TL-3 Crash Testing and Evaluation of the T631 Bridge Rail by : William F. Williams (Transportation engineer)
Download or read book MASH TL-3 Crash Testing and Evaluation of the T631 Bridge Rail written by William F. Williams (Transportation engineer) and published by . This book was released on 2016 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Texas Type T631 bridge rail was developed as a low-cost, flexible bridge rail system for TL-2 applications. Many of the features used for the system tested at MxRSF for TL-3 were incorporated into the design developed for this project for MASH TL-2 application. The TxDOT Type T631 bridge rail was designed, developed, and evaluated under MASH TL-2. The objective of this research was to evaluate the impact performance of the new TxDOT Type T631 bridge rail to MASH TL-3. The TxDOT Type T631 bridge rail was intended to serve as a low-cost replacement for the TxDOT Type T6 bridge rail for MASH TL-2 applications. The crash testing was performed in accordance with the requirements of MASH TL-3. The TxDOT T631 Bridge Rail performed acceptably for MASH TL-3.
Book Synopsis Guide for the Planning, Design, and Operation of Pedestrian Facilities by :
Download or read book Guide for the Planning, Design, and Operation of Pedestrian Facilities written by and published by AASHTO. This book was released on 2004 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Association of State Highway and Transportation Officials. Task Force for Roadside Safety Publisher : ISBN 13 : Total Pages :560 pages Book Rating :4.0/5 ( download)
Book Synopsis Roadside Design Guide by : American Association of State Highway and Transportation Officials. Task Force for Roadside Safety
Download or read book Roadside Design Guide written by American Association of State Highway and Transportation Officials. Task Force for Roadside Safety and published by . This book was released on 1989 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of the FDOT Variant of the Modified Kansas Corral Bridge Railing by : Dean C. Alberson
Download or read book Evaluation of the FDOT Variant of the Modified Kansas Corral Bridge Railing written by Dean C. Alberson and published by . This book was released on 2004 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MASH Test 3-11 of the TxDOT Single Slope Bridge Rail (type SSTR) on Pan-formed Bridge Deck by : William F. Williams
Download or read book MASH Test 3-11 of the TxDOT Single Slope Bridge Rail (type SSTR) on Pan-formed Bridge Deck written by William F. Williams and published by . This book was released on 2011 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Testing of State Roadside Safety Systems by : King K. Mak
Download or read book Testing of State Roadside Safety Systems written by King K. Mak and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NCHRP Report 350 Compliance Test 5-12 of the 1.07-m Vertical Wall Bridge Railing by : Dean C. Alberson
Download or read book NCHRP Report 350 Compliance Test 5-12 of the 1.07-m Vertical Wall Bridge Railing written by Dean C. Alberson and published by . This book was released on 1997 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal Highway Administration (FHWA) recently adopted new performance evaluation guidelines for roadside safety features set forth in NCHRP Report 350. This report contains the results of a crash test performed on the 1.07-m vertical wall bridge railing with a 36000V test vehicle under NCHRP Report 350 test level 5 conditions, i.e., impacting the length of need at a nominal speed and angle of 80 km/h and 15 degrees. The purpose of the test was to determine if the bridge railing would perform satisfactorily in containing and redirecting the heavy vehicle without rolling the vehicle.
Book Synopsis Crash Testing and Evaluation of the HDOT 42-in. Tall, Aesthetic Concrete Bridge Rail by : Robert W. Bielenberg
Download or read book Crash Testing and Evaluation of the HDOT 42-in. Tall, Aesthetic Concrete Bridge Rail written by Robert W. Bielenberg and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crash Testing and Evaluation of Attenuating Bridge Railing System by : Teddy James Hirsch
Download or read book Crash Testing and Evaluation of Attenuating Bridge Railing System written by Teddy James Hirsch and published by . This book was released on 1976 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MASH Railing Load Requirements for Bridge Deck Overhang by : Joshua S. Steelman
Download or read book MASH Railing Load Requirements for Bridge Deck Overhang written by Joshua S. Steelman and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "State highway agencies across the country are upgrading standards, policies, and processes to satisfy the 2016 AASHTO/FHWA Joint Implementation Agreement for MASH. Existing vehicle collision loads used for reviewing bridge deck overhangs are specified in Section 13 of the AASHTO LRFD [Load and Resistance Factor Design] Bridge Design Specifications, 9th edition (LRFD BDS), and are based on crash testing criteria according to the Contractor's final report for NCHRP Project 20-07(395), NCHRP Report 350. To meet the MASH implementation agreement, the loading requirements and analysis method for the bridge deck overhang should be investigated and the AASHTO LRFD BDS modified accordingly. Research was urgently needed to ensure public safety, satisfy the AASHTO MASH and LRFD bridge design requirements, and facilitate optimal use of agency funds. Under NCHRP Project 12-119, "MASH Railing Load Requirements for Bridge Deck Overhang;" the University of Nebraska-Lincoln was asked to (1) propose modifications to the AASHTO LRFD BDS related to loading requirements consistent with the AASHTO MASH impact conditions for bridge deck overhangs and (2) develop examples to demonstrate the application of the proposed modifications. The research included a literature review and analysis and design of bridge deck overhang for concrete barriers, open concrete railings, steel posts-on-decks, and steel posts-on-curbs subjected to a range of MASH Test Levels. The research team recommended important draft language for consideration by AASHTO in the next update of the LRFD BDS. In addition to this final report, Appendices B through E, containing four design examples, are available on the National Academies Press website (nap.nationalacademies.org) by searching for NCHRP Research Report 1078." -- publisher's website
