摩擦摆支座在软弱夹层场地地下结构中的减震效果分析  

Seismic Mitigation Effect Analysis on Friction Pendulum Bearings in Underground Structures in Site with Weak Interlayer

作　　者：许紫刚 李淳宇 徐长节[1,2] 庄海洋 张季 XU Zi-gang;LI Chun-yu;XU Chang-jie;ZHUANG Hai-yang;ZHANG Ji(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013 [2]华东交通大学土木建筑学院,南昌330013

出　　处：《科学技术与工程》2024年第17期7278-7287,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52108453,51978333);江西省自然科学基金(20212BAB214014,20232BAB204084)。

摘　　要：较一般成层场地而言,软弱夹层场地中地下结构抗震与减震问题更为突出。以双层双跨矩形框架地铁车站结构为研究对象,基于有限元软件ABAQUS,建立土-结构体系的静动力耦合有限元分析模型,研究软弱夹层对地铁车站结构的地震响应规律的影响,并对比分析了设置摩擦摆支座的车站结构在均质场地和软弱夹层场地的减震效果。结果表明:软弱夹层穿越地铁车站结构时,结构的整体和中柱的变形以及中柱底部的内力会大幅度增加,且随着夹层厚度增加,结构变形和内力的增加幅度更为明显。在中柱顶部设置摩擦摆支座,中柱的最大位移以及内力值均减小,且软弱夹层场地中摩擦摆支座的减震效果要明显优于一般均质场地,建议在软弱夹层场地地下结构中采用摩擦摆支座进行减震设计。Compared to the general layered sites,the seismic resistance and mitigation of underground structures in site with weak interlayer are more prominent.Taking the double-story and double-span rectangular frame subway station structure as the research object,based on the finite element software ABAQUS,a static and dynamic finite element analysis model of the soil-structure system was established.The influence of weak interlayer on the seismic response law of the subway station structure was studied,and the seismic mitigation effect of the station structure with friction pendulum bearings in homogeneous and weak interlayer sites was compared and analyzed.The results show that when the weak interlayer passes through the structure of a subway station,a notable increase in overall deformation,central column deformation,and internal forces at the base of the central column is brought about.Moreover,as the thickness of the interlayer increases,the increase in structural deformation and internal force becomes more significant.The installation of friction pendulum bearings at the top of the central column reduces the maximum displacement and internal force values of the central column,and the seismic mitigation effect of the friction pendulum bearings in sites with weak interlayer is significantly better than that in general homogeneous sites.The friction pendulum bearings are recommended to be used for seismic mitigation design in underground structures in sites with weak interlayer.

关 键 词：摩擦摆支座 软弱夹层 地铁车站 地震响应 减震 

分 类 号：TU352.12[建筑科学—结构工程] TU435