Selection and Parameter Optimization of Constraint Systems for Girder-End Longitudinal Displacement Control inThree-Tower Suspension Bridges  

作　　者：Zihang Wang Ying Peng Xiong Lan Xiaoyu Bai Chao Deng Yuan Ren 

机构地区：[1]School of Transportation,Southeast University,Nanjing,210096,China [2]Guangxi Rongwu Expressway Co.,Ltd.,Nanning,530000,China [3]CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing,100120,China

出　　处：《Structural Durability & Health Monitoring》2025年第3期643-664,共22页结构耐久性与健康监测(英文)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3706704);the Academician Special Science Research Project of CCCC(No.YSZX-03-2022-01-B).

摘　　要：To investigate the influence of different longitudinal constraint systems on the longitudinal displacement at the girder ends of a three-tower suspension bridge,this study takes the Cangrong Xunjiang Bridge as an engineering case for finite element analysis.This bridge employs an unprecedented tower-girder constraintmethod,with all vertical supports placed at the transition piers at both ends.This paper aims to study the characteristics of longitudinal displacement control at the girder ends under this novel structure,relying on finite element(FE)analysis.Initially,based on the Weigh In Motion(WIM)data,a random vehicle load model is generated and applied to the finite elementmodel.Several longitudinal constraint systems are proposed,and their effects on the structural response of the bridge are compared.The most reasonable system,balancing girder-end displacement and transitional pier stress,is selected.Subsequently,the study examines the impact of different viscous damper parameters on key structural response indicators,including cumulative longitudinal displacement at the girder ends,maximum longitudinal displacement at the girder ends,cumulative longitudinal displacement at the pier tops,maximum longitudinal displacement at the pier tops,longitudinal acceleration at the pier tops,and maximum bending moment at the pier bottoms.Finally,the coefficient of variation(CV)-TOPSIS method is used to optimize the viscous damper parameters for multiple objectives.The results show that adding viscous dampers at the side towers,in addition to the existing longitudinal limit bearings at the central tower,can most effectively reduce the response of structural indicators.The changes in these indicators are not entirely consistent with variations in damping coefficient and velocity exponent.The damper parameters significantly influence cumulative longitudinal displacement at the girder ends,cumulative longitudinal displacement at the pier tops,and maximum bending moments at the pier bottoms.The optimal damper parameters are fo

关 键 词：Three-tower suspension bridge vehicle loads longitudinal constraint system viscous damper multiobjective parameter optimization 

分 类 号：U44[建筑科学—桥梁与隧道工程]