近河谷地铁车站振动台模型试验研究  

Shaking table tests on a near-valley subway station

作　　者：禹海涛 王治坤 张中杰 宋毅 YU Haitao;WANG Zhikun;ZHANG Zhongjie;SONG Yi(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Urban Construction Design&Research Institute,Shanghai 200125,China)

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]同济大学土木工程学院,上海200092 [3]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《岩土工程学报》2024年第9期1800-1808,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(42177134);中央高校基本科研业务费专项资金项目。

摘　　要：近年来沿海沿江城市建设涌现出大量紧邻河谷地形修建的地铁车站,由于河谷地形具有地震动放大效应,会对近河谷结构抗震安全性构成威胁,但目前关于河谷地形效应对近邻结构的影响机制尚不清晰。提出了近河谷地铁车站1g振动台模型试验方法,分别设计了3组深宽比为1/8,1/4和1/3的圆弧形河谷地形,开展了不同地形、不同地震动输入条件下的近河谷地铁车站振动台模型试验研究,并以平整场地条件(无地形效应)下的地铁车站振动台试验工况为参照,对比分析了河谷地形效应对车站结构地震响应的影响规律。试验结果表明:与平整场地车站结构响应相比,在水平横向地震动作用下近河谷车站结构的动力响应较大,尤其是近河谷车站顶板处的加速度放大效应高达1.27倍;受河谷地形效应影响,车站中柱弯矩显著增加,而且邻近河谷侧的车站侧墙弯矩放大更为明显,即与平整场地相比放大效应可达2.3倍,同时该侧墙顶部的动土压力峰值也显著增强;随着河谷地形深宽比的增加,地形引起的局部地震动放大效应逐渐增加,导致近河谷车站结构的地震响应更为显著。研究成果可为近河谷地形地铁车站结构的抗震设计和安全性评估提供科学依据。A large number of subway stations close to valley topography have been built in coastal and riverine cities in recent years,and the seismic safety of near-valley structures is threatened due to the seismic amplification effects of valley topography during earthquakes.However,the influence mechanism of valley topography on the adjacent structures has not been well understood.In this study,a 1g shaking table test model method for a near-valley subway station is proposed.Three sets of circular valley topography with depth-to-width ratios of 1/8,1/4 and 1/3 are designed,the tests on a near-valley subway station under different topography and ground motion input conditions are performed,and a subway station test without valley site is used as a benchmark to investigate the seismic response of the valley topography on the adjacent structures.The results show that the dynamic response of the near-valley structures is greater under horizontal transverse motion compared to the response of the station structures without valley,particularly the acceleration amplification effects are up to 1.27 times at the structural top slab.The bending moment of the structural column increases due to the valley topography,and the amplification of the bending moment in the sidewall adjacent to the valley is more pronounced,i.e.,up to 2.3 times compared to the tests without valley site.Additionally,the peak dynamic earth pressure at the top of the side wall is higher.The local seismic amplification effects of valley are more pronounced as the depth-to-width ratio of the valley topography increases,which leads to a greater seismic response of the near-valley station structures.The research results can provide a scientific basis for the seismic design and safety assessment of station structures around valley topography.

关 键 词：地铁车站 地震响应 振动台试验 河谷地形效应 

分 类 号：TU924[建筑科学—建筑设计及理论]