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原文传递 Development of a Guide for Prioritization of Railway Bridges for Repair and Replacement.

题名：	Development of a Guide for Prioritization of Railway Bridges for Repair and Replacement.
作者：	Nowak, A. S.; Rakoczy, A. M.
关键词：	Bolted Connections; Bridge Maintenance; Damage Assessment; Einite Element Method(fem); Fatigue Problems; Freight Trains; Performance Evaluation; Prioritization; Railway Bridges; Rehabilitation; Repair
摘要：	The objective of this study was to develop evaluation bases for the repair, rehabilitation, and replacement of existing railway bridges. Considering the importance of bridges to the railway network, the research involved the review and analysis of major factors that influence structural performance, e.g., degree of corrosion, loss of material (section loss, holes), fatigue problems, and loose connections. In particular, the research focused on connections, and their importance relative to the evaluation of bridge performance. The relationship between various conditions and the ability to perform the required function (i.e., carry a freight train) was established in the form of maximum capacity. Sensitivity analysis was performed to establish the relationship between load and resistance factors. Results were presented in the form of graphs and tables. The outcomes of this study served as a basis for the development of a decision-making spread sheet. This report provides research documentation and offers a tool for bridge owners for the prioritization of structures for repair/rehabilitation or replacement. The study involved the nonlinear finite element method (FEM) analysis of stringer-tofloorbeam connections, the development of the resistance capacity of typical bridge connections, and the calculation of reduced capacity based on deterioration and other conditions. The findings and final conclusions of this research could serve as a basis for the development of more accurate provisions for the evaluation of railway bridges.
报告类型：	科技报告