考虑隔震支座竖向变形对基础隔震剪力墙结构的抗侧刚度影响研究  

PERFORMANCE RESEARCH ON LATERAL STIFFNESS OF THE BASE-ISOLATION SHEAR WALL STRUCTURE CONSIDERING VERTICAL DEFORMATION OF ISOLATION BEARING

作　　者：程蓓 耿攀 雷远德 CHENG Bei;GENG Pan;LEI Yuande(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;China Institute of Building Standard Design and Research,Beijing 100048,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]中国建筑标准设计研究院有限公司,北京100048

出　　处：《工业建筑》2020年第4期24-29,共6页Industrial Construction

基　　金：国家重点研发计划资助项目(2017YFC0703600);北京市自然科学面上基金项目(8162014)。

摘　　要：与普通抗震结构不同,由于隔震支座会发生竖向变形,基础隔震结构在地震作用下将会发生一定的刚体转动,进而影响上部结构的侧向刚度,而这种刚体转动在剪力墙结构中表现得尤为明显。采用ABAQUS有限元分析软件对基础隔震双肢剪力墙结构进行了非线性有限元数值模拟计算,建立30个有限元模型,通过改变隔震支座拉压刚度比值、墙体轴压比、高宽比,对比分析了隔震支座竖向变形引起的隔震层转动对双肢剪力墙隔震结构抗震性能的影响。结果表明:增大隔震支座拉压刚度比与轴压比、减小剪力墙高宽比可以减小隔震支座竖向变形引起的上部结构转动;由于上部结构转动的影响,隔震上部结构抗侧刚度明显低于相同条件抗震结构,在工程设计中应引起重视。Different from common seismic structures,due to the vertical deformation of the isolation bearing,certain rigid body rotation will occur in the base-isolated structure under the action of earthquake,thus affecting the lateral stiffness of the superstructure.Moreover,the rigid body rotation is particularly obvious in the shear wall structure.ABAQUS finite element analysis software was used to conduct the nonlinear finite element analysis of the coupled shear wall structure with base isolation.By changing the ratio of tensile and compressive stiffness of the isolation bearings,axial compression ratio and height-width ratio of the walls,thirty finite element models were established to analyze the influence of the rotation of the isolation layer caused by the vertical deformation of the isolation bearing on the seismic performance of the coupled shear wall isolation structure.The results showed that increasing the stiffness ratio and the axial compression ratio,decreasing the height-width ratio could reduce the rotation of the superstructure caused by the vertical deformation of the isolation bearing.Due to the influence of the rotation of the superstructure,the lateral stiffness of the isolated superstructure was obviously lower than seismic structure under the same condition,therefore attention should be paid in engineering design.

关 键 词：基础隔震 支座竖向变形 双肢剪力墙 抗侧刚度 有限元分析 

分 类 号：TU352.12[建筑科学—结构工程] TU398.2