不同支承条件下双塔不对称斜拉桥地震易损性分析  

Seismic Vulnerability Analysis of Two-tower Asymmetrical Cable-stayed Bridges UnderDifferent Supporting Conditions

作　　者：许恒 董军[1] Xu Heng;Dong Jun(Bejing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044

出　　处：《市政技术》2025年第2期26-34,共9页Journal of Municipal Technology

基　　金：北京市自然科学基金项目(8202012);河南省交通运输厅科技计划项目(201602)。

摘　　要：以某双塔四跨不对称斜拉桥为研究对象,通过改变其桥墩与主梁连接方式,研究不同支承条件下桥梁不同构件的损伤变化情况。采用OpenSees建立非线性有限元动力分析模型,采用增量动力分析法(IDA)得到桥墩和支座的地震响应;根据选取的墩底曲率、支座相对位移作为损伤指标,建立顺桥向地震易损性曲线。分析结果表明:支座和墩梁固结墩在地震作用下发生损伤的概率更高;纵桥向地震作用下墩梁固结桥墩相较于其他桥墩更易发生损伤;改变支承形式为固结的桥墩发生各类损伤的概率会显著增大,但同时其他构件发生各类损伤的概率会有不同程度的减小。相关结论可为类似不对称斜拉桥地震易损性分析提供参考。A four-span asymmetrical cable-stayed bridge with two towers was taken as the research object.The damage changes of different bridge components under different support conditions were studied by changing the connection modes between the piers and the beams.The nonlinear finite element dynamic analysis model was established by OpenSees.The seismic response of pier and support was obtained by the incremental dynamic analysis(IDA)method;The seismic vulnerability curves along the bridge was established according to damage indexes of the se-lected pier bottom curvature and the relative displacement of support.The analysis results show that the damage probability of the consolidated pier is higher under seismic action;Pier-beam consolidated piers are more suscepti-ble to damage than other piers under longitudinal seismic action;The probability of damage increase significantly when the support form is changed to consolidation,but the probability of other components decrease to different de-grees.The relevant conclusions can provide a reference for seismic vulnerability analysis of similar asymmetrical ca-ble-stayed bridges.

关 键 词：双塔不对称斜拉桥 地震易损性 IDA方法 有限元法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]