城市立交匝道桥桥墩地震弯剪扭破损机理分析  

Analysis of the Seismic Flexure-Shear-Torsion Damage Mechanism for Urban Interchange Ramp Bridge Piers

作　　者：曾显志 孟庆利[1] 李臣勋 张海燕 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《西南科技大学学报》2017年第4期19-25,99,共8页Journal of Southwest University of Science and Technology

基　　金：西南科技大学研究生创新基金项目(16ycx074)

摘　　要：基于压弯剪扭耦合作用下桥墩的弯剪滞回模型和扭转滞回模型,建立了某城市立交匝道桥有限元模型,并对其进行了动力特性分析和非线性地震时程反应分析,着重对比分析了该匝道桥固支墩和铰支墩的墩顶位移反应及非线性程度。结果表明,在地震作用下固支墩比铰支墩更容易发生破坏,其根本原因是因为扭转效应降低了固支墩的弯剪承载能力,致其在地震作用下因抗力不足而先发生破坏。同时分析了支座破坏的原因和破坏机理。Based on flexure-shear hysteretic model and torsional hysteretic model of fixed piers subjected to the interaction of axial load,shear force,flexural moment and torsional moment,an urban interchange ramp bridge finite element model is established,and then the analysis of dynamic characteristics and nonlinear seismic time history response was carried out on the ramp bridge model.The analysis is focused on nonlinear degree and the displacement response at the top of the fixed piers and cantilever piers of the ramp bridge.The time history analysis results show that fixed piers are easier to destroy than cantilever pies,because the torsion acted on fixed piers reduces the carrying capacity of flexure and shear so that fixed piers having not enough resistance ultimately cause its damage under earthquake.At the same time,analyses are conducted about the cause and mechanism of rubber bearing failure in this study.

关 键 词：匝道桥 弯剪扭耦合作用 滞回模型 非线性地震时程分析 破损机理 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]