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原文传递 Resiliency of Bridges on the BOSFOLK Corridor.

题名：	Resiliency of Bridges on the BOSFOLK Corridor.
作者：	Seymour, P.; Shenton, H. W.
关键词：	Bridges; Corridor Inventory; Corridors; Future Growth Insight; Historic Information; Macroview Approach; Northeast Corridor; Physcial Conditions; Resiliency; Safety Assessment; Transportation Systems
摘要：	Built with a design life of 50-years, many of the bridges on the Boston to Norfolk (BOSFOLK) corridor are nearing the end of their design life. Neglect, poor maintenance, and insufficient funding have left many of them in very bad condition. As the bridges on the BOSFOLK corridor near the end of their design life, one might ask, how resilient were the bridges on the corridor. How did the bridges on I-95 perform compared to those not on the corridor. And what can be learned from the BOSFOLK corridor about the durability and long-term performance of bridges. The objective of the research presented was to investigate, assess, and document the historic resiliency of bridges on the BOSFOLK corridor through a systematic investigation of historic data from the National Bridge Inventory (NBI) database from the period 1992 through 2009. Two different perspectives were considered in this study the macroview perspective and the microview perspective. The macroview approach used a very broad definition of the corridor that included more than 78,000 bridges. The microview approach used a much more narrowly defined view that included just under 38,000 bridges. In each case a database was created that included bridges on the corridor and bridges off the corridor. Descriptive and performance parameters were selected from the NBI and used to create databases that covered the period 1992 through 2009. Results were analyzed and presented in the form of timeline and column plots that show how the overall performance of the different inventories performed over the 18 year period. The macroview analysis revealed that the on-corridor inventory of bridges, while only slightly fewer in number and older than the off-corridor inventory, accounted for more bridge roadway area and was exposed to higher traffic volumes than the off-corridor inventory. However, by most of the tangible performance measures, which includes sufficiency rating, postings, and condition ratings, the on-corridor invento
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