非对称铁路连续梁桥抗震设计研究  

A Study on the Seismic Design of Asymmetric Continuous Girder Railway Bridge

作　　者：黄树强 聂细锋 张大军 龚亚军 HUANG Shuqiang;NIE Xifeng;ZHANG Dajun;GONG Yajun(Guiyang Branch of China Railway Eryuan Engineering Group Co.,Ltd.,Guiyang 550002,China)

机构地区：[1]中铁二院贵阳勘察设计研究院有限责任公司,贵阳550002

出　　处：《高速铁路技术》2023年第2期38-42,共5页High Speed Railway Technology

摘　　要：为研究非对称铁路连续梁桥的抗震性能,以某(44+72+72+60+31)m连续梁桥为研究对象,采用MIDAS/Civil软件建立三维有限元模型,输入罕遇地震作用下3条地震波,并采用非线性动力时程分析法对3种桥梁抗震设计方案进行研究。研究结果表明:全桥设置摩擦摆减隔震支座能有效降低桥梁各阶自振频率,仅在制动墩设置摩擦摆减隔震支座对桥梁高阶自振振型影响较小,全桥或仅制动墩设置摩擦摆减隔震支座均能降低墩身内力、桩基内力、墩顶位移、支座反力整体水平及结构材料用量,其中制动墩各项内力及位移减小最显著,非制动墩内力及位移变化幅度与墩高、支座布置方式及上部结构质量分布相关,体现出非对称性。To investigate the seismic performance of asymmetric continuous girder railway bridges,a(44+72+72+60+31)m continuous girder bridge was studied using a three-dimensional finite element model established with MIDAS/Civil,and three different seismic design schemes were analyzed through non-linear dynamic time history analysis,which involved inputting three seismic waves under seldomly occurred earthquakes.The study results indicate that:The use of friction pendulum bearing for seismic mitigation and isolation in the whole bridge can effectively reduce the natural vibration frequency of the bridge at all levels.The use of friction pendulum bearing for seismic mitigation and isolation only in the brake piers has little effect on the high-order natural vibration mode of the bridge.Both implementing friction pendulum bearing for seismic mitigation and isolation throughout the entire bridge or just in the braking piers can reduce the internal force of the pier body,the internal force of the pile foundation,the displacement of the pier top,the overall level of the bearing reaction force and the consumption of structural materials.Among them,the reduction of internal forces and displacement is most significant in the brake piers,and the variation range of the internal forces and displacement of the non-brake piers is related to the height of the piers,the layout of the bearings,and the mass distribution of the superstructure,reflecting asymmetry.

关 键 词：非对称铁路连续梁桥 抗震设计 时程分析 摩擦摆减隔震支座 

分 类 号：U442.555[建筑科学—桥梁与隧道工程]