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Development Of Guardrail To Bridge Rail Transition
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Book Synopsis Development of Guardrail to Bridge Rail Transition by : Roger P. Bligh
Download or read book Development of Guardrail to Bridge Rail Transition written by Roger P. Bligh and published by . This book was released on 1988 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Development of a MASH TL-2 Guardrail-to-bridge Rail Transition Compatible with 31-inch Guardrail by : Roger P. Bligh
Download or read book Development of a MASH TL-2 Guardrail-to-bridge Rail Transition Compatible with 31-inch Guardrail written by Roger P. Bligh and published by . This book was released on 2011 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of an Approach Guardrail Transition Attached to a Thrie Beam and Channel Bridge Railing by :
Download or read book Development of an Approach Guardrail Transition Attached to a Thrie Beam and Channel Bridge Railing written by and published by . This book was released on 2000 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guardrail-bridge Rail Transition Designs by :
Download or read book Guardrail-bridge Rail Transition Designs written by and published by . This book was released on 1988 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a MASH TL-3 Approach Guardrail Transition to a MASH TL-4 Steel Bridge Rail by : Jennifer D. Rasmussen
Download or read book Development of a MASH TL-3 Approach Guardrail Transition to a MASH TL-4 Steel Bridge Rail written by Jennifer D. Rasmussen and published by . This book was released on 2020 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Development of the GC-8000 Bridge Railing and Transition by : Rebecca A. Hitz
Download or read book Development of the GC-8000 Bridge Railing and Transition written by Rebecca A. Hitz and published by . This book was released on 2006 with total page 0 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 Upgrading Transitions from Approach Guardrails to Bridge Rails by :
Download or read book Upgrading Transitions from Approach Guardrails to Bridge Rails written by and published by . This book was released on 1988 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over one-half of 350 bridge-related fatal accidents in 1975 involved a collision with the end of a bridge rail. in some of these cases there was no approach guardrail. in other cases, the transition between the guardrail and the bridge rail deflected too much and allowed the vehicle to strike the bridge end. until recently, only a few crash tests had been conducted on guardrail to bridge rail transitions. a series of transition designs have been developed and tested that are significantly safer than many of the current standards. these improved designs are now being installed and should be in widespread use in the next few years. this paper presents detailed drawings of several designs, and briefly discusses the construction and maintenance considerations.
Book Synopsis MASH TL-3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge Or Culvert Structure by : William F. Williams (Transportation engineer)
Download or read book MASH TL-3 Evaluation of Guardrail to Rigid Barrier Transition Attached to Bridge Or Culvert Structure written by William F. Williams (Transportation engineer) and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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 Guardrail-bridge Rail Transition Designs by : Maurice E. Bronstad
Download or read book Guardrail-bridge Rail Transition Designs written by Maurice E. Bronstad and published by . This book was released on 1986 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This project was concerned with the transition designs used between W-beam and thrie guardrail, and rigid bridge rail parapets or wingwalls. State designs submitted to the Federal Highway Administration (FHWA) were rated and designs selected for crash test evaluation. New designs were also formulated and subjected to crash test evaluation. Most of the crash tests were conducted with 4500-lb (2000-kg) cars at 60 mph (95 km/hr) and a 25-degree angle. Design drawings are presented along with recommendations for use of these transition designs. Guidelines for transition features are given and design procedures for independent end blocks are given. This volume, which is third in a series, contains appendix C, Ratings of State Transition Designs, and appendix D, Barrier VII Plots for Selected Transitions."--Technical report documentation p.
Book Synopsis Guardrail-bridge Rail Transition Design by : Maurice E. Bronstad
Download or read book Guardrail-bridge Rail Transition Design written by Maurice E. Bronstad and published by . This book was released on 1988 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guardrail-bridge Rail Transition Designs by :
Download or read book Guardrail-bridge Rail Transition Designs written by and published by . This book was released on 1988 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two Approach Guardrail Transitions for Concrete Safety Shape Barriers by :
Download or read book Two Approach Guardrail Transitions for Concrete Safety Shape Barriers written by and published by . This book was released on 1998 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two approach guardrail transitions for use with concrete safety shape barriers were developed and crash tested. For this study, the transition systems were attached to the New Jersey safety shape concrete barrier; however, it is believed that these transition systems could be easily adapted to the F-shape barrier with no need for further crash testing. Both transition designs were constructed with two nested thrie beam rails measuring 2.66-mm thick. The first transition design was supported by nine W150x13.5 steel posts measuring, 1,981-mm long, while the second transition design was supported by nine 152-mm x 203-mm wood posts measuring 2,134-mm long. For both systems, post spacings consisted on one at 292 mm, five at 476 mm, and three at 952 mm. A triangular-shape concrete curb was constructed below the thrie beam rail on each approach guardrail transition system. The two transition systems successfully met the Test Level 3 requirements specified in NCHRP Report 350, "Recommended Procedures for the Safety Performance Evaluation of Highway Features."
Book Synopsis Guardrail-bridge Rail Transition Designs by : Maurice E. Bronstad
Download or read book Guardrail-bridge Rail Transition Designs written by Maurice E. Bronstad and published by . This book was released on 1986 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This project was concerned with the transition designs used between W-beam and thrie guardrail, and rigid bridge rail parapets or wingwalls. State designs submitted to the Federal Highway Administration (FHWA) were rated and designs selected for crash test evaluation. New designs were also formulated and subjected to crash test evaluation. Most of the crash tests were conducted with 4500-lb (2000-kg) cars at 60 mph (95 km/hr) and a 25-degree angle. Design drawings are presented along with recommendations for use of these transition designs. Guidelines for transition features are given and design procedures for independent end blocks are given. This volume, which is the second in a series, contains appendix B, Full-Scale Crash Test Reports."--Technical report documentation p.
Book Synopsis Development of a Low-cost, Energy-absorbing Bridge Rail by : Jeffrey C. Thiele
Download or read book Development of a Low-cost, Energy-absorbing Bridge Rail written by Jeffrey C. Thiele and published by . This book was released on 2010 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a MASH TL-3 Transition Between Guardrail and Portable Concrete Barriers by : David A. Gutierrez
Download or read book Development of a MASH TL-3 Transition Between Guardrail and Portable Concrete Barriers written by David A. Gutierrez and published by . This book was released on 2014 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
