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原文传递 Evaluation of Gusset Plate Safety in Steel Truss Bridges.

题名：	Evaluation of Gusset Plate Safety in Steel Truss Bridges.
关键词：	evaluation；bridge；late；trus；plat；stee；safety；literature；application；yield
摘要：	Failure of the I-35 truss bridge in Minneapolis has been attributed to failure of a gusset plate, necessitating evaluation of gusset plate safety on bridges across the county. FHWA Publication IF-09-014 provides state DOTs with important guidance for gusset plate evaluation but the methods are unnecessarily complex, requiring the use of point-in-time demands which are cumbersome to calculate, and do not investigate the likelihood of plate yielding under service loads, which may compromise plate safety. With support from WSDOT and FHWA, the PIs are developing a simpler and consistent evaluation method using finite element analyses (FEAs). The resulting Triage Evaluation Procedure (TEP) improves the speed, consistency and safety of gusset plate evaluation by predicting the onset gusset plate yielding, which permits evaluation of the likelihood of inelastic response under service conditions using envelope loads, thereby decreasing computation time while maintaining an appropriate level of conservatism. The TEP will save time and money relative to the FHWA method, while predicting safety. This proposal addresses research needed to evaluate gussets identified as potentially unsafe by the TEP, the likelihood of rivet yielding or failure, and the impact of corrosion. First, a practical, but more refined evaluation procedure (REP) will be furthered to evaluate gusset plates that fail the TEP in lieu of impractical detailed finite element modeling. The REP will be grounded in mechanics and verified by comparison with detailed FEA results for many gusset plate configurations. Second, the strength of older rivets will be investigated by reviewing experimental results from the literature; the rivet strengths specified in the FHWA Guide are conservative, which may result in unnecessary and costly rivet replacement. Third, the correct application of TEP and REP to corroded gusset plates, a common problem with national impact, will be investigated.
报告类型：	科技报告