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。
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.
出处
《工程力学》
EI
CSCD
北大核心
2005年第4期90-95,共6页
Engineering Mechanics
基金
国家自然科学基金项目(50478032)
交通部重点科技项目(95-06-02-12)
关键词
桥梁工程
现有混凝土桥梁
抗力
荷载
时变可靠度
自适应重要抽样法
bridge engineering
existing concrete bridge
resistance
load
time-dependent reliability
adaptive importance sampling method
