基于性能的高速铁路钢管混凝土拱桥地震经济风险分析  

Performance-based seismic financial risk assessment of a CFST arch bridge over high-speed railway

作　　者：冯莉[1] 樊燕燕[1] 王力[1] 李子奇[1,2] FENG Li;FAN Yanyan;WANG Li;LI Ziqi(School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control,Lanzhou Jiaotong University, Lanzhou 730070, China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学道桥灾害防治技术国家地方联合实验室,甘肃兰州730070

出　　处：《铁道科学与工程学报》2019年第3期573-580,共8页Journal of Railway Science and Engineering

基　　金：长江学者和创新团队发展计划滚动支持资助项目(IRT15R29)

摘　　要：在基于性能的地震风险评价理论基础上,以一座高速铁路钢管混凝土系杆拱桥为例,采用有限元分析软件建立全桥模型,运用增量动力分析(IDA)方法对该桥拱肋进行地震易损性分析,建立关键截面的易损性曲线,结合地震危险性和损失比,选取年预期损失作为地震经济风险指标,定量分析该桥的地震经济风险。研究结果表明:IDA方法用于钢管混凝土拱桥的地震经济风险分析是可行的,该桥主要经济风险来源于超越概率较高的中小级别地震,占桥梁整体经济风险损失的77.3%,通过对易损区域的局部加固设计,在提高桥梁鲁棒性的同时可减小结构的地震经济风险。Based on the performance-based earthquake engineering assessment theory,a typical CFST tied arch bridge was taken as an example,finite element software was used to build the bridge model,and the seismic vulnerability of the arch rib was analyzed by the incremental dynamic analysis(IDA)method,then the vulnerability curve of the key section was established.The seismic financial risk can be quantitatively expressed in term of expected annual loss(EAL)by integrating seismic hazard and loss ratio.The results show that the IDA method can be used to assess the overall financial risk exposure to earthquake hazard for a CFST tied arch bridge.The expected annual loss(EAL)expression of seismic economic risk shows that the bridge main financial risk from moderate and small earthquakes,accounting for 77.3%of the total.The designer can improve the structure robustness and reduce seismic financial risk of the bridge through the local reinforcement design of vulnerable area.

关 键 词：高速铁路 系杆拱桥 增量动力分析 易损性曲线 地震经济风险 

分 类 号：U24[交通运输工程—道路与铁道工程] TU398.9[建筑科学—结构工程]