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原文传递 Low Vertical Clearance Truss Bridges: Risk Assessment and Retrofit Mitigation Study

题名：	Low Vertical Clearance Truss Bridges: Risk Assessment and Retrofit Mitigation Study
作者：	Swett, G. D.; Bedi, G.
关键词：	Vehicle over height impact##Risk assessment##Truss bridges##Steel trusses##Vertical clearance##Portals##Sways##Retrofit designs##Mitigation Study##Washington State Department of Transportation (WSDOT)##Skagit River Bridge##
摘要：	The Washington State Department of Transportation (WSDOT) has over 60 steel truss bridges in its inventory with vertical clearances less than the minimum 16’-6” required for new bridges. This study evaluates the risks of oversized vehicle impacts to existing truss bridges with low vertical clearances. The Skagit River Bridge SR5/712 was hit by an oversized load on May 23rd, 2013 resulting in a catastrophic collapse. At the time of the collapse, the Skagit River Bridge had less than the minimum vertical clearance. WSDOT undertook this study to evaluate the risks of a similar occurrence happening and to evaluate potential mitigation schemes. Scoping level construction estimates for each scheme were then developed for all structures with substandard vertical clearance. All bridges were prioritized based on risk using a range of evaluation criteria. The goal and eventual purpose of the study is to be used as an asset management tool for programming future retrofit projects and for procuring the necessary funding.
总页数：	160
报告类型：	科技报告