考虑超载影响的基于裂缝宽度服役桥梁正常使用极限状态可靠度分析

In this paper, an appropriate coefficient is gained based on simulated multiple overloading experiment. This coefficient can be used to evaluate the influence of overload on the crack width of bridge member. Taking maximum crack width of structural member as the analysis object of normal limited state, the calculation of existing reinforced concrete bridge reliability based on fuzzy random method is illustrated herein. The effect of improvement of live load and difference of fuzzy failure bounds on reliability is considered. The failure probability influenced by overload is compared with that unconsidered the effect of overloading. This investigation indicates that the failure probability influenced by overload is larger than that unconsidered the effect of overload by 17%~23%. The result is helpful for the evaluation of bridges in use exactly.