无柱大跨变截面地铁车站地震响应分析  

Shaking Table Test Study on Pillarless Subway Station with Variable Section

作　　者：何旭升 周洋 傅长风 李江乐[2] HE Xusheng;ZHOU Yang;FU Changfeng;LI Jiangle(Nanning Rail Transit Group Co.,Ltd.,Nanning 530022,China;Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]南宁轨道交通集团有限公司,南宁530022 [2]西安建筑科技大学,西安710055

出　　处：《结构工程师》2020年第4期128-136,共9页Structural Engineers

基　　金：国家自然科学基金资助项目(51178388);陕西省教育厅重点试验室科研计划项目(11JS059,12JS055)

摘　　要：以南宁某无柱大跨变截面地铁车站为工程背景,设计制作了合理相似比下的现浇无柱变截面地铁车站考虑土-结相互作用的振动台试验模型,选用El Centro地震波、Taft地震波和南宁人工地震波等,进行了多种工况下的模拟地震振动台试验,研究了考虑土-结相互作用时无柱大跨变截面地铁车站的抗震性能和抗震薄弱部位,总结了其地震响应的主要特点和一般规律。同时,还采用MIDAS/GTS有限元分析软件,建立了振动台试验模型的有限元分析模型,进行了考虑土-结相互作用时无柱大跨变截面地铁车站在多种地震响应下的有限元分析,探讨了这类结构在地震响应下的内力分布规律和地震响应特点,并与试验结果进行了对比。研究结果表明,不同加速度峰值地震波作用下,结构模型的加速度响应随着地震作用峰值加速度的增加而增大,且结构模型的应力响应随着地震作用强度的增大而增大。当同一加速度峰值地震波作用时,结构模型加速度响应为顶板大于中板大于底板,结构模型侧墙的相对位移响应随着结构模型高度的增大而增大。振动台试验中,结构模型裂缝主要集中在中板变截面和底板变截面与侧墙连接处,说明此处在地震作用时易发生震害,设计时应予以着重考虑。In this paper,a columnless large-span subway station with variable-section in Xi'an is used as the background,and a shaking table model considering interaction between soil and station was designed with a reasonable similarity ratio.El Centro seismic waves,Taft seismic waves and X i'an artificial seismic waves were selected.Simulated seismic shaking table tests were performed under various working conditions.The seismic performance and weak positions of columnless large-span subway station with variable-section considering interaction between soil and station were studied.The main characteristics and general laws of the seismic response were summarized.At the same time,this paper also used the MIDAS/GTS finite element analysis software to establish the finite element analysis and calculation model of the shaking table test model.Based on the finite element analysis,the internal force distribution and seismic response characteristics of this type of structure under seismic response were discussed,and the results were compared with the experimental ones.The results showed that under different peak acceleration seismic waves,the acceleration response of the structural model increased with the increase of the peak acceleration of the seismic action,and the stress response of the structural model increased with the increase of the seismic action intensity.When the same peak acceleration seismic wave acted,the acceleration response of the top plate of the structural model was larger than the middle plate and the bottom plate.In the shaking table test,the cracks in the structural model were mainly concentrated on the joints between the variable section of the middle plate and the bottom plate and the side wall,which indicated that earthquake damage is likely to occur in these positions,and it should be carefully considered during design.

关 键 词：地下工程 无柱变截面地铁车站 振动台试验 有限元分析 地震响应 

分 类 号：U231.4[交通运输工程—道路与铁道工程]