Mash Tl 4 Evauation Of The Txdot Type C2p Bridge Rail
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Mash Tl 4 Evauation Of The Txdot Type C2p Bridge Rail
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Author : William F. Williams (Transportation engineer)
language : en
Publisher:
Release Date : 2017
Mash Tl 4 Evauation Of The Txdot Type C2p Bridge Rail written by William F. Williams (Transportation engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Bridge railings categories.
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.
Mash Tl 3 Testing And Evaluation Of The Txdot T131rc Bridge Rail Transition
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Author : William F. Williams
language : en
Publisher:
Release Date : 2013
Mash Tl 3 Testing And Evaluation Of The Txdot T131rc Bridge Rail Transition written by William F. Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Bridge railings categories.
Mash Tl 4 Evaluation Of 2019 Mash 2 Tube Bridge Rail
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Author : William F. Williams (Transportation engineer)
language : en
Publisher:
Release Date : 2019
Mash Tl 4 Evaluation Of 2019 Mash 2 Tube Bridge Rail written by William F. Williams (Transportation engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Bridge railings categories.
The purpose of the tests reported herein was to assess the performance of a new, taller Alaska Multi-State 2-Tube Bridge Rail (re-designated as 2019 MASH 2-Tube Bridge Rail) according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials (AASHTO), Manual for Assessing Safety Hardware (MASH), Second Edition 2016. The crash tests performed were in accordance with MASH Test Level 4 (TL-4), which involves three tests on the 2019 MASH 2-Tube Bridge Rail. This report provides details of the 2019 MASH 2-Tube Bridge Rail, detailed documentation of the crash tests and results, and an assessment of the performance of the 2019 MASH 2-Tube Bridge Rail for MASH TL-4 evaluation criteria.
Tl 4 Crash Testing Of The F411 Bridge Rail
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Author : Dean C. Alberson
language : en
Publisher:
Release Date : 2004
Tl 4 Crash Testing Of The F411 Bridge Rail written by Dean C. Alberson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Bridge railings categories.
Texas Department of Transportation (TXDOT) and Florida Department of Transportation (FDOT) frequently receive requests to provide aesthetically pleasing traffic rails for use on select bridges and roadways. TxDOT, in response to providing context sensitive design alternatives, initiated a project to develop additional aesthetically pleasing rail alternatives. Under a previous TxDOT project, the F411 bridge rail was constructed and crash tested to Test Level 3 (TL-3). The TL-3 test is a 4405-lb (2000 kg) pickup impacting the railing at 25 degrees and 62.2 mi/h (100 krn/h). 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. The TxDOT F411 bridge rail contained and redirected the vehicle, which remained upright during and after the collision period. The bridge rail met the required specifications for NCHRP Report 350 test 3-11. The objective of this research is the full-scale crash test and evaluation of the F411 to Test Level 4 (TL-4). The most direct approach for accomplishing the objectives of this task is to perform a full-scale TL-4 crash test of this railing design. The TL-4 vehicle is a single-unit box-van truck impacting the railing at 15 degrees and 49.7 mi/h (80 krn/h). While containment is required, overturning of the vehicle 90 degrees is an acceptable test outcome. The TxDOT F411 bridge rail performed acceptably for NCHRP Report 350 test 4-12. Based on the performance of the F411 bridge rail in the full-scale crash test to TL-4 test conditions, the F411 may be used where containment of 18,000 lb single-unit trucks is desired.
Mash Tl 3 Testing And Evaluation Of A Steel Bridge Rail With Pickets
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Author : William F. Williams
language : en
Publisher:
Release Date : 2012
Mash Tl 3 Testing And Evaluation Of A Steel Bridge Rail With Pickets written by William F. Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Bridge railings categories.
Mash Tl 3 Evaluation Of 2019 Mash 2 Tube Bridge Rail Thrie Beam Transition
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Author : William F. Williams (Transportation engineer)
language : en
Publisher:
Release Date : 2020
Mash Tl 3 Evaluation Of 2019 Mash 2 Tube Bridge Rail Thrie Beam Transition written by William F. Williams (Transportation engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Bridge railings categories.
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.
Development Of A Mash Tl 4 Steel Side Mounted Beam And Post Bridge Rail
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Author : Oscar Pena
language : en
Publisher:
Release Date : 2019
Development Of A Mash Tl 4 Steel Side Mounted Beam And Post Bridge Rail written by Oscar Pena and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
A new steel, side-mounted, beam-and-post, bridge rail was designed, crash-tested, and evaluated according to safety performance guidelines included in the American Association of State Highway and Transportation Officials Manual for Assessing Safety Hardware (MASH) for Test Level 4 (TL-4). The new bridge rail system was designed to be compatible to multiple concrete bridge decks utilized by the States of Illinois and Ohio. Bridge rail configurations were designed and optimized based on weight per foot, constructability, and safety. Post-to-rail and rail-to-rail connections were designed for the new bridge rail. Several concepts for these connections were configured, and after discussion with representatives from the Illinois and Ohio DOTs, a preferred concept was selected for full-scale crash testing with a single-unit truck, a pickup truck, and a small car. The new bridge rail consisted of three tubular steel rail elements supported by W6x15 (W150x22.5) steel posts mounted to the exterior, vertical edge of the concrete deck and spaced on 8 ft (2.4 m) on centers. The top rail element was an HSS 12-in. x 4-in. x 1⁄4-in. (HSS 304.8-mm x 101.6-mm x 6.4-mm) and the lower two rail elements were HSS 8-in. x 6-in. x 1⁄4-in. (HSS 203.2-mm x 152.4-mm x 6.4-mm). The centerline heights of the rail elements were 37 in. (940 mm), 28 in. (711 mm), and 16 in. (406 mm) above the surface of the deck for the top, middle, and bottom rails, respectively. Three MASH TL-4 crash tests were performed on the new bridge rail, which successfully contained and redirected the MASH TL-4 vehicles. All occupant risk measures and evaluation criteria were within MASH limits. For MASH test designation no. 4-12 with the single-unit truck, the impact severity did not meet the minimum limit of 142.0 kip-ft (180.6 kJ). Thus, test designation no. 4-12 is recommended to be re-run. However, a maximum roll angle of 36 degrees and a dynamic deflection of 4.3 in. (109.2 mm) represent a positive indication that a subsequent test with a single-unit truck would likely meet MASH TL-4 impact safety criteria.
Dynamic Testing Of The T223 Bridge Rail
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Author : William F. Williams
language : en
Publisher:
Release Date : 2009
Dynamic Testing Of The T223 Bridge Rail written by William F. Williams and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Bridge railings categories.
The TxDOT T203 bridge rail is often used on bridges where asphalt overlays reduce the effective height of the bridge rail. This reduction in height due to asphalt paving overlay is undesirable. For this project, several geometric features were changed to improve the strength and crash performance of the T203 rail. These features include increasing the rail height to 32 inches, increasing the size and strength of the rail, and increasing the thickness of the post. In addition, the width of the post was reduced to 4 ft and the openings between the posts were increased to 6 ft. Orientation, placement, and frequency of reinforcing steel in the rail, post, and deck were also evaluated to determine if impact damage to the deck can be reduced. These proposed changes to the T203 rail led to the development of the TxDOT Type T223 bridge rail design, which is reported herein. The objective of this project was to evaluate the strength of the new TxDOT Type T223 Bridge Rail design with respect to different reinforcing steel details in the deck, rail, and posts. The strength of the new TxDOT Type T223 bridge rail was evaluated using dynamic bogie testing. These tests were performed at the ends/joint (two tests) and at mid-span locations (two tests). Reinforcing steel details varied at each test location to determine the preferred placement and orientation of reinforcing steel for the TxDOT Type T223 bridge rail and supporting deck to minimize deck damage during a design impact event.
Mash Test 4 12 Of Shallow Anchorage Single Slope Traffic Rail Sstr
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Author : Sana M. Moran
language : en
Publisher:
Release Date : 2020
Mash Test 4 12 Of Shallow Anchorage Single Slope Traffic Rail Sstr written by Sana M. Moran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Automobiles categories.
The purpose of the tests reported herein was to assess the performance of the Texas Department of Transportation's (TxDOT's) shallow anchorage single slope traffic rail (SSTR) according to the safety performance evaluation guidelines included in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH). MASH Test 4-12 was performed on the TxDOT shallow anchorage SSTR to determine the structural adequacy of the anchorage. Two different barrier configurations were evaluated: with and without dowel bars between barrier segments across expansion joints. This report provides details of the TxDOT shallow anchorage SSTR, the crash tests and results, and the performance assessment of the TxDOT shallow anchorage SSTR as a MASH Test Level 4 (TL-4) longitudinal barrier. Both variations of the TxDOT shallow anchorage SSTR (with and without dowel bars between barrier segments across expansion joints) were determined to be MASH TL-4 compliant. No delamination or damage to the deck was observed in the test installation after impact
Mash Test 3 11 On The Texas T101 Bridge Rail
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Author : Roger P. Bligh
language : en
Publisher:
Release Date : 2011
Mash Test 3 11 On The Texas T101 Bridge Rail written by Roger P. Bligh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Bridge railings categories.