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原文传递 Dynamic Evaluation of MGS Stiffness Transition With Curb

题名：	Dynamic Evaluation of MGS Stiffness Transition With Curb
作者：	Winkelbauer, B. J.; Putjenter, J. G.; Rosenbaugh, S. K.; Lechtenberg, K. A.; Bielenberg, R. W.; Faller, R. K.; Reid, J. D.
关键词：	Guardrails##Highway safety##Curbs##Performance evaluation##Compliance##Crash tests##Longitudinal barriers##Research project##Roadside appurtenances##Safety standards##Steels##Stiffness##Testing##Thrie beams##Transitions##Midwest Guardrail System(MGS)##Manual for Assessing Safety Hardware(MASH)##
摘要：	In 2010, Midwest Roadside Safety Facility (MwRSF) researchers successfully developed and crash tested a simplified, upstream stiffness transition for connecting 31-in. (787-mm) tall Midwest Guardrail System (MGS) to existing, thrie beam approach guardrail transition systems. The approach guardrail transition consisted of standard 12-gauge (2.66-mm thick) W-beam guardrail, an asymmetrical 10-gauge (3.42-mm thick) W-beam to thrie beam transition element, standard 12-gauge (2.66-mm thick) thrie beam guardrail, and nested 12-gauge (2.66 mm thick) thrie beam guardrail. The approach guardrail transition was supported by two post types - W6x8.5 (W152x12.6) steel sections and W6x15 (W152x22.3) steel sections - using various spacing. Crash testing was successfully performed in accordance with the Test Level 3 (TL-3) impact safety standards published in the American Association and State Highway Officials (AASHTOs) Manual for Assessing Safety Hardware (MASH). However, this barrier system was not evaluated with a lower concrete curb. The addition of a curb may negatively affect the performance of the system in a number of ways. For example, a curb may cause vehicle instabilities and/or rollovers during redirections in this stiffness-sensitive region. Additionally, small car front ends may become wedged between the curb and the bottom of the W-to-thrie transition segment which can lead to excessive snagging. Therefore, the performance of the MGS stiffness transition installed with curb needed to be evaluated through full-scale testing. The objective of the research project was to evaluate the safety performance of the MGS stiffness transition to thrie beam approach transitions configured with a lower concrete curb.
总页数：	294
报告类型：	科技报告