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Title:: Study on Response of Mid-storey Isolation Structure with SSI Effect Subjected to Three-dimensional Ground Motions

作者:: 赵洁¹; 刘德稳¹; 姚顺忠¹; 刘阳²; 招继炳¹; 周旺旺¹; 肖帅¹; 武倩倩¹; 万锋¹; 李天明¹; (1.西南林业大学土木工程学院,云南昆明 650024; 2.同济大学土木工程学院,上海 200092)

Author(s):: ZHAO Jie¹; LIU Dewen¹; YAO shunzhong¹; LIU Yang²; ZHAO Jibing¹; ZHOU Wangwang¹; (1.College of Civil Engineering,Southwest Forestry University,Kunming 650024,Yunnan,China;2.School of civil engineering,Tongji University,Shanghai 200092,China)

Keywords:: three-dimensional ground motion; three-dimensional seismic isolation; SSI effect; mid-storey isolation structure

摘要:: 为探讨三维地震下层间隔震结构考虑土-结构相互作用(SSI效应)时的地震响应,建立了考虑SSI效应的层间隔震结构模型,分别输入一维、二维、三维地震动,比较层间隔震结构在不同维度地震波输入工况下的地震响应。针对三维地震动输入下隔震支座拉压应力超限问题,添加三维隔震装置,并与传统水平隔震结构地震响应结果进行对比分析。结果表明:三维地震动输入下的结构地震响应大于一维和二维; 加入三维隔震支座后,竖向地震动被有效隔离,结构地震响应减小,优化了支座受力,支座拉压破坏问题得以解决,地基土体应力小于设置传统水平隔震支座下的土体应力,对地基和基础设计有利。

Abstract:: In order to investigate the seismic response of the mid-storey isolation structure subjected to three-dimensional ground motions when the soil-structure interaction(SSI effect)is taken into account,a mid-storey isolation structure model related with SSI effect was established.To compare the seismic response of the mid-storey isolation structure under different conditions,one-dimensional,two-dimensional and three-dimensional ground motions are input respectively.In order to solve the problem of excessive tensile and compressive stresses of isolation bearing when inputting three-dimensional ground motion,a three-dimensional isolation device is installed and the seismic response of the structure is compared with that of the traditional horizontal isolation structure.The results show that the seismic response of the structure subjected to three-dimensional ground motion is greater than that subjected to one-dimensional and two-dimensional ground motions; when the three-dimensional isolation bearing is installed,the vertical ground motion is effectively isolated,and the structural seismic response is reduced; the bearing force is optimized,and the problem of bearing tension and compression failure is solved; the soil stress of the foundation is less than the soil stress under the traditional horizontal isolation bearing,which is beneficial to the foundation and foundation design.