建筑结构学报2018，Vol.39Issue(3)：48-55,8.DOI:10.14006/j.jzjgxb.2018.03.007
基础隔震结构中上部结构与隔震层的刚度比限值研究
Study on limit of stiffness ratio between upper structure and isolation layer in base isolation structure
摘要
Abstract
The stiffness ratio of seismic isolation,defined as the ratio of stiffness of the superstructure to the isolation layer,is proposed to be an index for controlling structural deformation and showing the deformation characteristics of the upper structure and isolation layer.Assuming that the seismic force of the superstructure is in a rectangular distribution,an equivalent simplified method for isolation structure is proposed based on the simplified method of SDOF system in general.The influences of the stiffness and dynamic characteristics in TDOF system simplified model were analyzed,and the results shown in the form of the stiffness ratio explained the influence of the structural displacement demand,the displacement distribution function,and the stiffness ratio on the seismic performance of structure.Relationship between displacement demand and structure period,expression of critical stiffness ratio,formula of the maximum and minimum stiffness ratio limit were deduced in terms of the seismic performance.The stiffness ratio limit of three types of isolated structures (frame,frame-shear wall and shear wall structure in upper structure form) are calculated with different heights,seismic intensities and damping under rare earthquake.The results show that stiffness ratio limit to isolated structure should not be less than 4 in general;low-rise isolated structure is mainly controlled by the minimum stiffness ratio limit,while high-rise structures by the maximum stiffness ratio limit under specific conditions.The results of the calculation was compiled into tables for reference.关键词
隔震结构/隔震刚度比/位移需求/抗震性能Key words
isolated structure/stiffness ratio of seismic isolation/displacement demand/seismic performance分类
建筑与水利引用本文复制引用
尚守平,王彦..基础隔震结构中上部结构与隔震层的刚度比限值研究[J].建筑结构学报,2018,39(3):48-55,8.基金项目
国家“十二五”科技支撑计划(2015BAL03801-5). （2015BAL03801-5）
