锈蚀-疲劳作用下的砼梁桥失效概率分析  

Failure probability analysis of reinforced concrete bridges under coupled corrosion fatigue effects

作　　者：周海俊[1] 米红雨[1] 谭也平[1] 

机构地区：[1]深圳大学土木工程学院,深圳518060

出　　处：《深圳大学学报（理工版）》2010年第1期109-113,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：广东高校自然科学育苗工程资助项目(LYM08089);深圳市公共科技计划基金资助项目(SY200806270071A)

摘　　要：研究氯离子侵蚀、混凝土开裂和车辆荷载反复作用对钢筋混凝土梁桥结构抗力退化的影响,建立了砼梁桥在锈蚀疲劳作用下的结构抗力退化模型,采用蒙特卡洛法编写了相应的时变失效概率计算程序.以广东省某沿海砼简支梁桥为例,计算其时变失效概率,并预测其使用寿命.分析结果表明,在车流密集锈蚀-疲劳作用下,砼梁桥的时变失效概率远大于仅考虑锈蚀影响的时变失效概率,指出在分析砼梁桥可靠度时,应考虑车辆荷载反复作用对结构抗力退化的影响.A probabilistic model is proposed to assess the resistance of reinforced concrete （RC） structures located in chloride-contaminated environment with the effects of cyclic traffic loads. Monte Carlo method was applied to find the ultimate limit state failure probability. The structural reliability of an existing simply supported bridge in Guangdong Province was evaluated with different load conditions. The results show that the expected service lifetime of RC bridges is greatly reduced due to the coupled corrosion fatigue effects.

关 键 词：结构工程 钢筋混凝土 砼梁桥 锈蚀疲劳 时变失效概率 蒙特卡洛法 

分 类 号：U448.217[建筑科学—桥梁与隧道工程] TU311.2[交通运输工程—道路与铁道工程]