梁端碰撞效应对铁路自复位桥墩地震反应的影响  

Effects of inter-beam end collisions effect on seismic response of railway self-resetting bridge piers

作　　者：杨泽 夏修身[1] 祝浩然 杨钟仁 张智中 李秀华 YANG Ze;XIA Xiushen;ZHU Haoran;YANG Zhongren;ZHANG Zhizhong;LI Xiuhua(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中铁二院工程集团有限责任公司,成都610031

出　　处：《振动与冲击》2025年第7期172-180,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(52068041,52278186);兰州交通大学重点研发项目资助(LZJTU-ZDYF2305);中国中铁股份有限公司科技研究开发计划课题(实用技术2022-重大-01)。

摘　　要：为探究梁端之间的碰撞对铁路自复位桥墩地震反应的影响,以一座铁路简支梁桥为工程背景,建立空间自复位桥墩全桥模型,并进行了模型验证。选择七条近断层地震动作为输入,进行非线性时程分析,讨论了梁端碰撞对墩顶位移、提离位移、墩底弯矩、墩底剪力、支座剪力以及碰撞力的影响,探究了伸缩缝宽度和碰撞刚度对碰撞效应的影响规律。结果表明:梁端之间的碰撞会减小墩顶位移,但会显著增大支座剪力与墩底弯矩及墩底剪力。墩顶位移随着伸缩缝宽度增大而增大,墩底弯矩、墩底剪力及支座剪力随伸缩缝宽度增大而减小。支座剪力随碰撞刚度先增大后减小,碰撞刚度对墩顶位移与墩底弯矩的影响相对较小。常用伸缩缝宽度下强震导致的梁端碰撞不可避免,铁路自复位桥梁抗震设计时应考虑碰撞效应的影响。Here,to investigate effects of inter-beam end collisions on seismic response of railway self-resetting bridge piers,taking a railway simply supported beam bridge as the engineering background,a spatial full-bridge model with self-resetting bridge piers was established and the model verification was performed.7 near fault ground motions were selected as inputs for nonlinear time history analysis,and effects of inter-beam end collisions on pier top displacement,pier bottom displacement,pier bottom bending moment,pier bottom shear force,pedestal shear force and collision force were discussed.Effects of expansion joint width and collision stiffness on collision effects were explored.The results showed that inter-bean end collisions reduce pier top displacement,but significantly increase pedestal shear force,pier bottom bending moment and pier bottom shear force;pier top displacement increases with increase in expansion joint width,while pier bottom bending moment,pier bottom shear force and pedestal shear force decrease with increase in expansion joint width;pedestal shear force increases firstly and then decreases with increase in collision stiffness,and effects of collision stiffness on pier top displacement and pier bottom bending moment are smaller;inter-beam end collisions caused by strong earthquakes under commonly used expansion joint widths are inevitable,and effects of collision effect should be considered in aseismic design of railway self-resetting bridges.

关 键 词：铁路 自复位桥墩 碰撞效应 地震反应 支座剪力 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]