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原文传递 Development of User Cost Data for Florida's Bridge Management System

题名：	Development of User Cost Data for Florida's Bridge Management System
作者：	Paul D. Thompson, Dr. F. T. Najafi, Roberto Soares, & Hong Jae Choung
关键词：	AASHTOWare Pontis Bridge Management System (BMS) Pontis user cost model Model of Accident Risk
摘要：	FDOT is implementing the AASHTOWare Pontis Bridge Management System (BMS) as a decision support tool for planning and programming bridge maintenance, repairs, rehabilitation, improvements, and replacement for more than 6,000 bridges on the state highway network. A BMS stores inventory and inspection data in a database, and uses engineering and economic models to predict the possible outcomes of policy and program decisions. User cost models are used in Pontis to quantify, in economic terms, the potential safety and mobility benefits of functional improvements to bridges. The Pontis user cost model estimates the user benefits of three types of functional improvements: • Bridge widening, which primarily affects accident risk on the roadway carried by the bridge. The addition of new lanes to increase capacity is not addressed in this model since it is closely tied to the widening of the approach road, which is beyond the scope of the BMS. • Bridge raising, which affects the ability for tall trucks to pass under the bridge. The user cost model predicts the potential savings in truck detour costs. • Bridge strengthening, which affects the ability for heavy trucks to pass over the bridge. Here, also, the user cost model predicts the potential savings in truck detour costs. Almost 15 % of the bridges on Florida’s state highway system have functional needs according to Pontis default level-ofservice standards. The FDOT selected the University of Florida, with subcontract support from Paul D. Thompson, to analyze the applicability of the Pontis model to Florida and to customize it as needed so it will woric effectively in support of FDOT decision-making. The two-year project included a detailed analysis of the Pontis model, an extensive review of the literature on bridge safety and related topics, a search for Florida-specific data to quantify the model, and development of a new model of accident risk. An analysis of the Pontis user cost model found that it was overly sensitive to extremes of roadway width, yielding unrealistically high benefit estimates. A new model was developed using Florida data on bridge characteristics and traffic accidents. The new model has superior behavior and statistical characteristics on a full inventory of state highway bridges. The result is the first new model of bridge-related accident risk developed anywhere in the United States in more than 15 years, reflecting the substantial improvements in roadway and vehicle safety that have occurred in that time. Since it relies solely on National
报告类型：	科技报告