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中文摘要：
将桥梁视为由各主要构件组成的一个体系，考虑一般大气环境下劣化混凝土桥梁抗力退化性及其荷载的时变性，采用自适应重要抽样法计算劣化桥梁的体系时变失效概率．同时，对变量进行了参数敏感性分析．研究结果对科学、经济地制定桥梁维修计划和方案具有重要意义．
英文摘要：
A bridge can be treated as a system consisted of several main components. In this paper, the time-variant failure probability of the degraded bridge subjected to time-dependent resistance and load is investigated. The adaptive important sampling method is used to evaluate the system time-variant failure probability. Additionally, the effect of several parameters on the system failure probability is studied.
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