基于Monte-Carlo法的异形双层连续梁桥地震易损性分析  

Seismic vulnerability analysis of special-shaped double-layer continuous beam bridge based on Monte-Carlo method

作　　者：周叶飞 王文炜 吕鑫颖 程毅 Zhou Ye-fei;Wang Wen-wei;Lv Xin-ying;Cheng Yi(The Fourth Engineering Co.Ltd.of China Railway 15th Bureau Group,Xinzheng 450050,China;Department of Bridge Engineering,School of Transportation,Southeast University,Nanjing 211189,China;Chengxian College,Southeast University,Nanjing 210088,China)

机构地区：[1]中铁十五局集团第四工程有限公司,河南新郑450050 [2]东南大学交通学院桥梁工程系,江苏南京211189 [3]东南大学成贤学院,江苏南京210088

出　　处：《工程抗震与加固改造》2023年第4期100-107,117,共9页Earthquake Resistant Engineering and Retrofitting

摘　　要：地震灾害对桥梁安全具有严重影响,复杂桥梁结构的地震易损性研究尤为重要。本文基于OpenSees有限元软件,建立了双层异形连续梁桥的有限元模型,应用Monte-Carlo方法进行了桥梁系统易损性分析,选取支座、桥墩和圆支架作为结构易损性构件。根据所选的地震动强度参数以及各易损性构件的损伤指标进行了非线性时程分析,获得的易损性曲线介于一阶界限法串联系统的上下界之间,验证了Monte-Carlo法的有效性。与Monte-Carlo法双层桥梁系统易损性曲线进行了对比,发现上层桥梁系统易损性曲线与双层桥梁系统易损性曲线在各个损伤状态下相差很小。对于双层桥梁系统易损性的分析,可简化为上层桥梁系统易损性分析。Earthquake disaster has a serious impact on bridge safety,and the research on seismic vulnerability of complex bridge structures is particularly important.In this paper,the finite element model of double-layer special-shaped continuous beam bridge is established based on OPENSEES finite element software,the vulnerability analysis of the bridge system is carried out by using Monte-Carlo method,and the bearings,piers and circular supports are selected as the structural vulnerable components.The nonlinear time history analysis is carried out according to the selected seismic strength parameters and the damage indexes of each vulnerable component,The vulnerability curve obtained is between the upper and lower bounds of the first-order boundary method series system,which verifies the effectiveness of Monte-Carlo method.Compared with the vulnerability curve of double deck bridge system by Monte-Carlo method,it is found that the vulnerability curve of upper deck bridge system is almost consistent with that of double deck bridge system under each damage state.The vulnerability analysis of double deck bridge system can be simplified to the vulnerability analysis of upper deck bridge system.

关 键 词：地震易损性 MONTE-CARLO法 OPENSEES 异形双层桥梁 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]