摘要
为了研究异型钢管混凝土(CFST)拱桥在地震作用下的易损性,以一座城市异型钢管混凝土拱桥为研究对象,通过MIDAS/Civil软件建立全桥非线性有限元模型并进行增量动力分析(IDA).分别以桥墩和拱肋曲率延性比、支座位移延性比为损伤指标,建立了主要构件地震易损性曲线.并基于一阶、二阶界限估计法得到了全桥系统的地震易损性曲线.结果表明:在横向地震作用下,该异型钢管混凝土拱桥整体抗震性能较好,支座和桥墩较拱肋在地震作用下更易出现损伤,为该桥的易损构件;该桥拱肋在地震作用下表现出良好的强健性,最易损伤区域位于坦拱拱脚,应加强其构造处理.
In order to study the vulnerability of irregular concrete-filled steel tubular(CFST)arch bridge under earthquake,a city irregular CFST arch bridge is taken as the research object.The nonlinear finite element model of the whole bridge is established by MIDAS/Civil software and the incremental dynamic analysis(IDA)is carried out.The seismic vulnerability curves of the main components are established by taking the ductility ratio of pier and arch rib,the displacement ratio of bearing seat as damage index.Based on the first-order and second-order boundary estimation,the seismic vulnerability curves of the bridge system are obtained.The results show that the irregular CFST arch bridge has a good seismic performance as a whole under the action of cross bridge earthquake,the bearings and piers are more vulnerable to be damaged than the arch rib under transverse seismic action,which is the vulnerable component of the bridge.The arch rib of the bridge shows good robustness under the earthquake,and the most vulnerable area is located at the foot of the flat arch,so its structural treatment should be strengthened.
作者
王力
虞庐松
刘世忠
李子奇
刘朋
WANG Li;YU Lu-song;LIU Shi-zhong;LI Zi-qi;LIU Peng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Road&Bridgeand Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;Xuzhou Design Institute of China Railway Shanghai Design Group Co.,Ltd.,Xuzhou 221000,Jiangsu,China)
出处
《兰州交通大学学报》
CAS
2020年第5期13-19,共7页
Journal of Lanzhou Jiaotong University
基金
长江学者和创新团队发展计划滚动支持(IRT15R29)。
关键词
地震易损性
界限估计法
异型钢管混凝土拱桥
增量动力分析
seismic vulnerability
boundary estimation method
irregular CFST arch bridge
incremental dynamic analysis
