【摘要】 在研究现有混凝土桥梁抗力和荷载的时变性的基础上,建立了现有桥梁的时变可靠度计算模型,并采用自适应重要抽样法计算时变可靠指标。同时,对变量进行了参数敏感性分析。研究结果对于科学、经济地制定桥梁维修计划和方案具有重要意义。更多还原

【Abstract】 The time-variant failure probability of the degraded bridge subjected to time-dependent resistance and load is investigated. A time-variant resistance model for the components of the existing concrete bridge in China is established considering reduction in area of corroding reinforcement, degradation of steel strength and concrete strength. A random load process is introduced. The adaptive importance sampling method is used to evaluate the time-dependent reliability index. Additionally, the effect of several parameters on the system failure probability is studied. The present study serves a reference to better predicting the service life of deteriorating RC bridges, and to developing optimal lifetime reliability-based maintenance strategies for bridges.更多还原