Development Of A Mash Tl 2 Guardrail To Bridge Rail Transition Compatible With 31 Inch Guardrail
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Development Of A Mash Tl 2 Guardrail To Bridge Rail Transition Compatible With 31 Inch Guardrail
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Author : Roger P. Bligh
language : en
Publisher:
Release Date : 2011
Development Of A Mash Tl 2 Guardrail To Bridge Rail Transition Compatible With 31 Inch Guardrail 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 Roads categories.
Development Of A Mash Tl 3 Approach Guardrail Transition To A Mash Tl 4 Steel Bridge Rail
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Author : Jennifer D. Rasmussen
language : en
Publisher:
Release Date : 2020
Development Of A Mash Tl 3 Approach Guardrail Transition To A Mash Tl 4 Steel Bridge Rail written by Jennifer D. Rasmussen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Bridges categories.
A Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) approach guardrail transition (AGT) was designed to connect the Midwest Guardrail System (MGS) to a MASH TL-4 steel-post, steel-tube, bridge rail, Type IL-OH. Two connection concepts were evaluated using the LS-DYNA finite element analysis computer software. The second concept was selected for further evaluation with full-scale crash testing, which included a previously-developed, thrie-beam, approach guardrail transition, modified HSS8x6x1/4 transition tube rails that aligned with the lower and middle bridge rail tubes, and new connection hardware designed to prevent vehicle snag during reverse-direction impacts. The critical impact points were selected using LS-DYNA for MASH test designation nos. 3-20 and 3-21 in the impact direction from the thrie-beam to the bridge rail. MASH test designation nos. 3-20 and 3-21 in the impact direction from the bridge rail to the thrie-beam AGT were determined to be non-critical. In test no. STBRT-1, the 2,404-lb small car impacted the AGT at a speed of 64.6 mph, an angle of 25.2 degrees, and at a location 21.3 in. upstream from post no. 19, thus resulting in an impact severity of 60.9 kip-ft. The small car was contained and redirected and resulted in a successful test according to MASH test designation no. 3-20 safety performance criteria. In test no. STBRT-2, the 5,007-lb quad cab pickup truck impacted the AGT at a speed of 62.7 mph, an angle of 24.9 degrees, and at a location 15.9 in. upstream from post no. 19, thus resulting in an impact severity of 116 kip-ft. The pickup truck was contained and redirected and resulted in a successful test according to MASH test designation no. 3-21 safety performance criteria.
Mash Tl 3 Evaluation Of Guardrail To Rigid Barrier Transition Attached To Bridge Or Culvert Structure
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Author : William F. Williams (Transportation engineer)
language : en
Publisher:
Release Date : 2020
Mash Tl 3 Evaluation Of Guardrail To Rigid Barrier Transition Attached To Bridge Or Culvert Structure 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 Automobiles categories.
Texas Transportation Institute (TTI) researchers performed an extensive literature review of bridge railing transitions crash tested to Manual for Assessing Safety Hardware (MASH) TL-3, and incorporated the information obtained from this review into the design and details for the new transition testing developed for this project. TTI researchers developed concepts for the new transition anchored to a concrete wing wall. TTI researchers developed a full-scale, three-dimensional finite element model of the guardrail transition. The modeling effort included developing and validating a subcomponent level model of the post installed on concrete. Upon completion of the simulations, TTI researchers processed the results and assessed the likelihood of the transition system passing the required MASH crash tests. TTI researchers noted the design deficiencies and recommended design modifications to the system to mitigate those deficiencies. TTI researchers developed full-scale test installation drawings of the design after the finite element model simulations were completed and all the results were reviewed with favorable results. After approval of the test installation drawings by Texas Department of Transportation (TxDOT), construction of a full-scale test installation for crash testing commenced, and crash tests were performed on the full-scale test installation. The Guardrail to Rigid Barrier Transition Attached to Bridge or Culvert Structure, used on the upstream and downstream ends, performed acceptably for MASH TL-3 transitions.
Development Of A Mash Tl 3 Transition Between Guardrail And Portable Concrete Barriers
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Author : David A. Gutierrez
language : en
Publisher:
Release Date : 2014
Development Of A Mash Tl 3 Transition Between Guardrail And Portable Concrete Barriers written by David A. Gutierrez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Road work zones categories.
Often, road construction causes the need to create a work zone. In these scenarios, portable concrete barriers (PCBs) are typically installed to shield workers and equipment from errant vehicles as well as prevent motorists from striking other roadside hazards. For an existing W-beam guardrail system installed adjacent to the roadway and near the work zone, guardrail sections are removed in order to place the portable concrete barrier system. The focus of this research study was to develop a proper stiffness transition between W-beam guardrail and portable concrete barrier systems. This research effort was accomplished through development and refinement of design concepts using computer simulation with LS-DYNA. Several design concepts were simulated, and design metrics were used to evaluate and refine each concept. These concepts were then analyzed and ranked based on feasibility, likelihood of success, and ease of installation. The rankings were presented to the Technical Advisory Committee (TAC) for selection of a preferred design alternative. Next, a Critical Impact Point (CIP) study was conducted, while additional analyses were performed to determine the critical attachment location and a reduced installation length for the portable concrete barriers. Finally, an additional simulation effort was conducted in order to evaluate the safety performance of the transition system under reverse-direction impact scenarios as well as to select the CIP. Recommendations were also provided for conducting a Phase II study and evaluating the nested Midwest Guardrail System (MGS) configuration using three Test Level 3 (TL-3) full-scale crash tests according to the criteria provided in the Manual for Assessing Safety Hardware, as published by the American Association of Safety Highway and Transportation Officials (AASHTO).
Development Of Guardrail To Bridge Rail Transition
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Author : Roger P. Bligh
language : en
Publisher:
Release Date : 1988
Development Of Guardrail To Bridge Rail Transition 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 1988 with Bridge railings categories.
This report describes the development and testing of a guardfence-to-rigid bridge rail transition. The transition consists of a tubular W-beam supported on 7 inch diameter round wood posts. It is designed to transition to a vertical wall or to the concrete safety shaped barrier. It can be used on new construction or as a retrofit for existing installations. Based on a full-scale vehicular crash test program, the design was judged to be in compliance with recommended impact performance criteria as presented in NCHRP Report 230. Also described is a tentative design for approach guardfence at bridge ends near an abutting roadway. The design consists of short radius, curved guardrail supported on weakened round wood posts.
Steel Railing Type Il Oh
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Author : Scott K. Rosenbaugh
language : en
Publisher:
Release Date : 2021
Steel Railing Type Il Oh written by Scott K. Rosenbaugh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Bridges categories.
Over the past few years, the Midwest Roadside Safety Facility worked with the Illinois and Ohio Departments of Transportation to develop a new side-mounted, steel tube bridge rail to satisfy the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware, Second Edition (MASH) Test Level 4 (TL-4) safety performance criteria. The new bridge rail was designed to be adaptable to multiple bridge deck configurations, including cast-in-place concrete slabs and prestressed box-beam decks. The system was designed to remain crashworthy after the placement of a future roadway overlay up to 3 in. thick. The final design incorporated three HSS tube rails supported by W6x15 posts spaced at 8 ft on-center. Additionally, a transition from the Midwest Guardrail System (MGS) to the new side-mounted, steel tube bridge rail was developed to satisfy MASH TL-3 criteria. The approach guardrail transition (AGT) incorporated the MGS upstream stiffness transition and 34-in. tall nested thrie-beam to account for future overlays. A distance of 9 ft was established between the last AGT post and the first bridge rail post in order to span over any structures that may prohibit post installation (abutments, wing walls and/or drainage features) Specialized HSS end rails were developed to extend between the adjacent bridge and AGT posts and provide the strength required to redirect errant vehicles. The development and full-scale testing of both the bridge rail and the transition were documented in previous reports. This report, the fourth in the series, summarizes the development and evaluation of the systems, contains CAD details and component variation descriptions, and provides implementation guidance for the Steel Railing Type IL-OH and its associated transition.
Mash Tl 3 Transition Between Median Guardrail And Median Concrete Barrier
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Author : Akram Y. Abu-Odeh
language : en
Publisher:
Release Date : 2021
Mash Tl 3 Transition Between Median Guardrail And Median Concrete Barrier written by Akram Y. Abu-Odeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Automobiles categories.
The purpose of this research was to develop a Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) compliant transition between a median guardrail and median concrete barrier, and then test the design according to MASH TL-3 crash testing guidelines. The design was developed using finite element computer simulations. This report provides details on the computer simulations, the Texas Department of Transportation (TxDOT) median transition system, the crash tests and results, and the performance assessment of the median transition for MASH TL-3 transition evaluation criteria. The TxDOT median transition met the performance criteria for MASH TL-3 transitions.
Mash Tl 3 Deflection Reduction For 31 Inch Guardrail
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Author : James C. Kovar
language : en
Publisher:
Release Date : 2023
Mash Tl 3 Deflection Reduction For 31 Inch Guardrail written by James C. Kovar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with Roads categories.
"Roadside obstacles are often too close to the roadway to permit the installation of common guardrail designs. Guardrail systems are often modified with a combination of tighter post spacing, nesting of rails, and other guardrail stiffening mechanisms to reduce deflections. NCHRP Research Report 1100: MASH TL-3 Deflection Reduction for 31-Inch Guardrail: A Guide, from TRB's National Cooperative Highway Research Program, presents a guide on the use of stiffening mechanisms to reduce the deflection for 31-inch guardrail installations while maintaining system integrity and safety performance. Supplemental to the report are two presentations summarizing the project, one including videos of crash testing and another without the crash-testing videos."--publisher's website
Development Of Installation Guidelines For Midwest Guardrail System In Combination With Roadside Curbs For Mash Tl 3 Applications
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Author : Scott K. Rosenbaugh
language : en
Publisher:
Release Date : 2024
Development Of Installation Guidelines For Midwest Guardrail System In Combination With Roadside Curbs For Mash Tl 3 Applications written by Scott K. Rosenbaugh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024 with Automobiles categories.
"While curbs are useful for many functions, highway design policies typically discourage the use of 6-inch- to 8-inch-tall curbs on high-speed roadways due to their potential to cause drivers to lose control in a crash. [This report] develops guidelines for the use and placement of 31-inch-tall Midwest Guardrail System adjacent to curbs under Manual for Assessing Safety Hardware (MASH) Test Level 3 impact conditions." -- publisher's website.
Guardrail Bridge Rail Transition Designs
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Author :
language : en
Publisher:
Release Date : 1988
Guardrail Bridge Rail Transition Designs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Bridge railings categories.