高层框架核心筒体系基础隔震设计  

Base isolation design of high-rise frame core tube system

作　　者：徐旷 高向宇[1] XU Kuang;GAO Xiangyu(Key Laboratory of Earthquake Engineering and Structural Retrofit of Beijing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学北京市工程抗震与结构诊治重点实验室,北京100124

出　　处：《建筑结构》2021年第S02期634-639,共6页Building Structure

摘　　要：针对高层建筑采用基础隔震后面临的减震效果,支座受拉关键问题,以某抗震设防烈度为8度(0.2g)、高度为80m的典型高层框架核心筒结构为例设计了四种基础隔震方案,在考虑了支座非线性的情况下进行了罕遇地震下三向地震波同时输入的动力时程分析,对比了四种方案的位移、加速度、基底剪力、支座极值面压等地震响应。研究结果表明:核心筒下采用铅芯橡胶支座并在隔震层外围布置粘滞阻尼器可有效降低上部结构层间位移角,控制支座极值面压,在不同地震波作用下,均可稳定发挥作用;核心筒下角点处的隔震支座轴力波动幅值较大,应尽可能采用承载力大的大尺寸支座;在高层框架核心筒体系的基础隔震设计中,楼面梁与核心筒采用铰接形式将增大支座极值面压与上部结构层间位移角,降低了结构的抗震安全性。For the key problem of bearing tension and damping effect faced by high-rise buildings after using base isolation, four basic seismic isolation schemes were designed for a typical high-rise frame core-tube structure with an height of 80 m and a seismic intensity of 8 degree(0.2 g). Dynamic time-history analysis of simultaneous input of three-way seismic waves under rare earthquakes was carried out considering the non-linearity of the supports. Seismic responses such as displacement, acceleration, base shear and extreme surface pressure of the supports are compared among the four schemes. The research results show that the use of lead rubber bearings under the core tube and viscous dampers around the isolation layer can effectively reduce the interlayer displacement angle of the superstructure and control the extreme surface pressure of the support. It can be used under different seismic waves stably. The vertical force vibration amplitude of the isolation bearing at the lower corner of the core tube is large, and large-diameter bearings with large bearing capacity should be used as much as possible. In the basic isolation design of the high-rise frame core tube system, the use of hinged connection between the floor beam and the core tube will increase the extreme surface pressure of the support and the displacement angle between the layers of the superstructure, and reduce the seismic safety of the structure.

关 键 词：高层建筑 框架核心筒 基础隔震 

分 类 号：TU973.31[建筑科学—结构工程]