曲率半径对大温差地区小半径曲线梁桥地震响应影响分析  

Influence of curvature radius on the seismic response of small radius curved girder bridges in large temperature difference area

作　　者：丁万鹏 虞庐松[1] 李子奇[1,2] 王力[1] DING Wanpeng;YU Lusong;LI Ziqi;WANG Li(School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《地震工程学报》2022年第1期93-99,共7页China Earthquake Engineering Journal

基　　金：长江学者和创新团队发展计划滚动支持(IRT15R29)。

摘　　要：为研究曲率半径和近断层脉冲效应对大温差地区小半径曲线梁桥在地震作用下的动力响应和碰撞效应的影响规律,以某大温差地区曲线梁桥为研究对象,建立不同曲率半径的全桥非线性有限元模型,考虑温度变化对支座性能和伸缩缝间距的影响,开展桥梁地震响应分析。结果表明:随着主梁曲率半径增大,墩底内力响应逐渐增加,邻梁间碰撞效应逐渐增强;温度越高,墩底内力越小;近断层脉冲地震动作用下的桥墩响应较远场地震动作用大。The seismic response and pounding effect of small radius curved girder bridges considering the curvature radius and the near-fault pulse-impulse effect in areas with large temperature difference were analyzed in this paper.Taking a curved gird bridge in large temperature difference area of Northwest China as an project example,different nonlinear finite element models of the whole bridge with different radius of curvature were established.The influence of thermal load on the bearing stiffness and beam expansion deformation was considered.The influence of curvature radius on the seismic response of the curved girder bridge was studied based on the internal force of pier and the pounding effect of adjacent girders.The results showed that with the increase of curvature radius of main beam,both the internal force response of pier bottom and the pounding effect between adjacent beams increase gradually.The internal force of pier bottom at extreme low temperature is much greater than that at extreme high temperature.The internal force of pier bottom under the action of near-fault pulse-like ground motion is larger than that under the action of gar-field ground motion.

关 键 词：曲线梁桥 曲率半径 近断层脉冲型地震动 温度效应 碰撞效应 

分 类 号：U448.215[建筑科学—桥梁与隧道工程]