地下结构地震破坏的大比尺循环推覆加载模型试验方法及其验证  

Large-scale cyclic-loading pushover test method and its verification for seismic damage of underground structures

作　　者：杨靖 庄海洋[1,2] 王伟 张广宇 陈苏 YANG Jing;ZHUANG Haiyang;WANG Wei;ZHANG Guangyu;CHEN Su(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100022,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009 [2]华东交通大学土木建筑学院,江西南昌330013 [3]北京工业大学建筑工程学院,北京100022

出　　处：《岩土工程学报》2023年第4期796-804,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51978333);南京工业大学优秀博士学位论文培育计划项目。

摘　　要：目前振动台模型试验很难真实模拟地下结构的地震破坏特征及其发展过程,以大开地铁车站结构为原型,考虑周围土压力等效,基于单层地下结构抗震性能的层间位移角划分体系,确定了以位移控制的循环加载曲线,设计并开展了1∶7的大比尺模型结构推覆试验,并与数值模拟结果进行了对比。结果表明:车站结构中柱端部会先于结构的其他构件出现裂缝,发生先拉后压破坏,随着中柱承载能力的下降,结构内力开始重新分配,上覆土压逐渐向侧墙转移,进而导致顶板端部和侧墙顶底端裂缝开始发展,最终结构整体失去承载能力。与数值模拟结果相比,设计的大比尺地下结构地震破坏推覆加载试验能够准确模拟单层地下车站结构的地震破坏过程。同时,与已有的单层地下车站抗震性能水平研究结果对比,进一步验证了新模型试验方法能够合理再现单层地下结构抗震性能水平。It is difficult to effectively simulate the seismic damage characteristics of underground structures and their failure process in the current shaking table model tests.A large-scale 1∶7 pushover test on an underground subway station structure is designed and carried out.Taking Daikai subway station structure as the prototype,considering the equivalent soil pressure and the interlayer displacement ratio division system,the cyclic-loading curve based on displacement is finally determined.At the same time,it is compared with the results of the numerical simulation.The results show that the tensile cracks appear at the ends of the column earlier than at the other components of the structure,and then the compression damage occurs.As the bearing capacity of the column decreases,the internal forces of the structure begin to redistribute,and the overlying soil pressure gradually transfers to the walls,which causes the cracks at the ends of the roof to start to develop.At the same time,the concrete at the ends of the walls is damaged,and finally,the structure eventually loses its bearing capacity.Compared with the numerical simulation results,the designed large-scale pushover tests on the seismic response of the underground structures can accurately simulate the seismic failure process of the single-story underground station structures.At the same time,compared with the existing researches on the seismic performance levels of the single-story underground subway station structures,it is further verified that the proposed new large-scale pushover test method can reasonably reproduce the seismic performance levels of the single-story underground structures.

关 键 词：地铁地下车站结构 循环加载推覆试验 数值模拟 抗震性能水平 地震破坏 

分 类 号：TU354[建筑科学—结构工程]