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• W2249206434 abstract "A fundamental task of bridge management is to optimize fund allocations for the reconstruction, maintenance, repair and inspection of a bridge network under existing constraints. The first step in this process is to assume that all existing bridges are beneficial to the community of users. Thus a bridge is rebuilt, repaired or maintained according to its condition. Since all bridge management decisions are optimized under certain constraints, a bridge management system (BMS) provides a method for prioritizing work on structures according to selected criteria. A simple approach would involve addressing the bridges in the worst condition first. An improved system evaluates bridges according to the cost of the work needed. Intervention in the bridge deterioration process at an earlier stage is cost effective by comparison to allowing the bridge to depreciate and then replacing it. A further refinement considers the importance of the bridge to the users. Several factors can be used to reflect this consideration, such as average daily traffic, peak daily traffic, alternate routes, traffic accident count, and level of serviceability. Some of these factors can be treated as deterministic variables, while others are of a random nature. A detailed evaluation would assign certain value to the time lost by the users due to partial or full bridge closure. The study of bridge deck repair strategies by Llanos and Yanev (Proceedings of the Civil Engineering Automation Conference, November 1991) for instance assumed that bridges rated below three provide 75% and bridges rated below two provide 50% of the full bridge service. An accurate evaluation of this assumption would be of considerable benefit. An estimate of the effect of bridge conditions on traffic accidents and their respective cost would have to be made as well. Considering the above factors as variables allows one to observe their influence on bridge management strategies. Thus, it becomes possible to demonstrate critical levels of service that determine the optimal strategy for a bridge, e.g., to rebuild under partial or full closure, to demolish without replacement, or to rehabilitate. In the current practice such decisions are based on experience and engineering judgement. It would be helpful to compare these decisions with a model addressing an entire network, consisting of bridges of different size, importance, and level of deterioration, such as the ones in New York City or even individual cases such as the East River crossings." @default.
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• W2249206434 date "1994-04-01" @default.
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• W2249206434 title "USER COSTS IN A BRIDGE MANAGEMENT SYSTEM" @default.
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