Seismic fragility analysis of three-tower cable-stayed bridges with different connection configurations  

作　　者：Chen Chen Liu Jinlong Lin Junqi Li Suchao 

机构地区：[1]Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China [2]Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China [3]Key Laboratory of Structural Dynamic Behavior and Control,Ministry of Education,Harbin Institute of Technology,Harbin 150090,China

出　　处：《Earthquake Engineering and Engineering Vibration》2024年第4期1009-1027,共19页地震工程与工程振动（英文刊）

基　　金：National Key R&D Program of China under Grant No.2022YFC3003603。

摘　　要：Seismic fragility analysis of three-tower cable-stayed bridges with three different structural systems,including rigid system(RS),floating system(FS),and passive energy dissipation system(PEDS),is conducted to study the effects of connection configurations on seismic responses and fragilities.Finite element models of bridges are established using OpenSees.A new ground motion screening method based on the statistical characteristic of the predominant period is proposed to avoid irregular behavior in the selection process of ground motions,and incremental dynamic analysis(IDA)is performed to develop components and systems fragility curves.The effects of damper failure on calculated results for PEDS are examined in terms of seismic response and fragility analysis.The results show that the bridge tower is the most affected component by different structural systems.For RS,the fragility of the middle tower is significantly higher than other components,and the bridge failure starts from the middle tower,exhibiting a characteristic of local failure.For FS and PEDS,the fragility of the edge tower is higher than the middle tower.The system fragility of RS is higher than FS and PEDS.Taking the failure of dampers into account is necessary to obtain reliable seismic capacity of cable-stayed bridges.

关 键 词：seismic fragility cable-stayed bridge connection configuration viscous damper comparison analysis 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]