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An optimal maintenance program is the key to making appropriate decisions to minimize cost and maintain an appropriate level of safety. In this paper, the strategy on repairing and strengthening of existing bridges based on time-dependent reliability was analyzed with the maximum expected benefit as the objective function. Risk ranking and lifecycle cost analysis were considered in the reliability-based bridge assessment. A practical application of risk-ranking decision was illustrated herein based on updated inspection information with the bridge at survival age 35. The effects of improvement of live load and difference of repair methods on time-dependent reliability of existing bridges were studied. The decision method can be used in real projects, with the cost of failure consequence and the risk of failure considered.
An optimal maintenance program is the key to making Appropriate decisions to minimize cost and maintain an appropriate level of safety. In this paper, the strategy on repairing and strengthening of existing bridges based on time-dependent reliability was analyzed with the maximum expected benefit as the objective function. Risk ranking and lifecycle cost analysis were considered in the reliability-based bridge assessment. A practical application of risk-ranking decision was illustrated based on updated inspection information with the bridge at survival age 35. The effects of improvement of live load and difference of repair methods on time-dependent reliability of existing bridges were studied. The decision method can be used in real projects, with the cost of failure consequence and the risk of failure considered.