基于IDA的自锚式悬索桥地震易损性分析  

Seismic Fragility Analysis of Self-anchored Suspension Bridge Based on Incremental Dynamic Analysis

作　　者：闫磊[1] 曹磊 杨恺 YAN Lei;CAO Lei;YANG Kai(School of Highway,Chang an University,Xi'an 710064,Shaanxi,P.R.China)

机构地区：[1]长安大学公路学院

出　　处：《重庆交通大学学报（自然科学版）》2019年第11期41-45,共5页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：自锚式悬索桥作为一种高次超静定的柔性结构体系,现行规范仅给出抗展设计原则且相关易损性研究较少。以三塔自锚式悬索桥为研究对象,建立结构有限元动力模型,基于PEER强震数据库选取了10条地震动记录,采用增呈动力分析(IDA)方法建立了桥墩、支座、桥塔及吊索构件的顺桥向地震易损性曲线,运用一阶可靠度理论建立桥梁系统的易损性曲线。研究结果表明:顺桥向地震波作用下桥墩、支座发生损伤的概率较高,构件损伤概率从易到难依次为支座、P1、P5桥墩、吊索、边塔、中塔;在不同损伤指标下结构整体损伤概率明显高于构件损伤概率。Self anchored suspension bridge is a kind of flexible structure system with high order statically indeterminate structure.Current codes only give seismic design principles,and there are few related vulnerability studies.Taking the three tower self anchored suspension bridge as the research object,the finite element dynamic model of the structure was established.Based on PEER strong earthquake database,10 ground motion records were selected.Incremental dynamic analysis(IDA)method was used to establish the seismic vulnerability curves of piers,supports,pylons and suspension members along the bridge.The vulnerability curves of bridge system were established by first order reliability theory.The results show that the damage probability of piers and supports is higher under the action of seismic wave along the bridge.From easy to difficult,the damage probabilities of components are bearings.P1,P5 piers,hangers,side towers,and middle towers.The overall damage probability of the structure is obviously higher than that of the components under different damage indices.

关 键 词：桥梁工程 地震易损性 增量动力法 自锚式悬索桥 易损性曲线 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]