Development of the Midwest Guardrail System (MGS) W-beam to Thrie Beam Transition Element PDF Download
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 378
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Author: David A. Gutierrez
Publisher:
ISBN:
Category : Road work zones
Languages : en
Pages : 232
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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).
Author: Jennifer D. Rasmussen
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 321
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Book Description
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.
Author: Kevin D. Schrum
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 236
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The roadway width required to install a guardrail system with a 12-in. (305-mm) blockout is not always available. In response, proprietary non-blocked W-beam guardrail systems were developed and successfully crash tested. However, the use of proprietary systems requires the State Deparments of Transportation to maintain inventory of specialized components. Therefore, a mon-proprietary, non-blocked W-beam guardrail system was developed.
Author: Jeffrey C. Thiele
Publisher:
ISBN:
Category : Bridge railings
Languages : en
Pages : 450
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Author: Mitch J. Wiebelhaus
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 174
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Author:
Publisher:
ISBN:
Category : Bridge railings
Languages : en
Pages : 168
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Author: American Association of State Highway and Transportation Officials
Publisher: AASHTO
ISBN: 1560514167
Category : Social Science
Languages : en
Pages : 275
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 314
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