考虑地震滑冲效应的高铁简支梁桥横向减震体系研究  

Transverse shock-absorbing system of high-speed railway simply supported beam bridge considering seismic sliding-impact effect

作　　者：杨孟刚[1,2] 栗梦成 胡尚韬 YANG Menggang;LI Mengcheng;HU Shangtao(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中南大学高速铁路建造技术国家工程研究中心,长沙410075

出　　处：《振动与冲击》2023年第7期312-320,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(51978667,82278232);中国中铁股份有限公司科技研究开发计划项目重大专项课题(2021-专项-04-2)。

摘　　要：对近断层地震滑冲效应作用下高铁简支梁桥横向碰撞响应及其减震体系进行了研究。以一座5跨32 m简支梁桥为背景,采用Abaqus软件建立全桥有限元模型。分析了远场地震和近断层地震滑冲效应作用下桥梁横向地震响应的差异,探究了传统抗震挡块的适用性;对比分析了“挡块+拉索”组合、全桥单独安装拉索限位器及单独安装减震榫等3种减震体系的减震效果。结果表明:与远场地震相比,近断层地震滑冲效应作用下传统抗震挡块完全失效,落梁风险显著增加;挡块与垫石间隙越小,“挡块+拉索”的减震效果越好;拉索限位器的减震效果随拉索自由程减小而提高;减震榫取最优刚度时,能够显著减小桥梁地震响应;综合比选,全桥单独安装减震榫的减震体系最佳。Here,transverse impact response and shock-absorbing system of high-speed railway simply supported beam bridge under near-fault seismic sliding-impact effect were studied.Taking a 5-span 32 m simply supported beam bridge as the background,the whole bridge finite element(FE)model was established using the FE software Abaqus.Differences of lateral seismic responses of bridge under actions of far-field and near-fault seismic sliding-impact effects were analyzed,and the applicability of traditional anti-seismic block was explored.Shock-absorbing effects of 3 shockabsorbing systems including combination of"block+cable",cable stopper installed alone overall bridge and damping tenon installed alone overall bridge were analyzed contrastively.The results showed that compared with far-field earthquake,traditional anti-seismic block fails fully and the risk of beam-falling significandy increases under the action of near-fault seismic sliding-impact effect;the smaller the gap between block and pad stone,the better the damping effect of "block+cable";damping effect of cable stopper increases with decrease in free path of cable;when damping tenon has the optimal stiffness,bridge seismic response can be significantly reduced;through comprehensive comparison,shockabsorbing system with damping tenon installed alone overall bridge is the best.

关 键 词：高速铁路 简支梁桥 近断层地震 滑冲效应 碰撞效应 减震体系 

分 类 号：U422.55[交通运输工程—道路与铁道工程]