基底隔震高层建筑风振响应和等效静风荷载  

Wind-induced response and equivalent static wind load for base-isolated tall buildings

作　　者：李志豪 黄国庆 周颖[3] 杨庆山[2] 杨旭东 Li Zhihao;Huang Guoqing;Zhou Ying;Yang Qingshan;Yang Xudong(Institute for Smart City of Chongqing University in Liyang,Liyang 213300,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]重庆大学溧阳智慧城市研究院,溧阳213300 [2]重庆大学土木工程学院,重庆400045 [3]同济大学土木工程学院,上海200092

出　　处：《东南大学学报（自然科学版）》2024年第4期852-860,共9页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178456,51978107);高等学校学科创新引智计划资助项目(B18062)。

摘　　要：基于高层建筑风荷载规范,建立了基底隔震高层建筑在风荷载下的运动方程,推导得到了结构风振响应均方根.通过3栋高度不同的隔震高层建筑工程案例,对比分析了它们隔震前后的结构动力特性和顺风向风致响应;提出了与非隔震建筑等效静风荷载在表达形式上一致的基底隔震建筑等效静风荷载公式,其中对风振因子简化公式进行了修正.结果表明:结构隔震后在初始刚度弹性范围内的振动频率降低,阻尼比减小,振型在隔震层位置存在滑移,因此结构各响应较非隔震建筑增大;提出的背景因子简化公式可精确估计隔震结构风振系数,同时也可用于加速度的计算.该研究为高层隔震建筑在弹性范围内的风振验算提供了参考.Based on the wind load code for tall buildings,the equation of motion of the base-isolated tall building under wind load was established,and the root mean squares of structural wind-induced responses were derived.Taking three base-isolated tall buildings with different heights as study cases,the dynamic characteristics and along-wind responses of buildings before and after isolation were investigated.Similar to the formula for the equivalent static wind load(ESWL)of the fixed-base buildings,the corresponding ESWL of the base-isolated buildings was proposed,where the simplified formula of wind-induced vibration factor was modified.The results show that the modal frequency and damping ratio of the isolated building with the elastic isolation layer are reduced,and a clear drift at the isolation layer in mode shape is observed.Consequently,the structural response increases obviously compared with the fixed-base building.The simplified formula of the background factor of base-isolated buildings can accurately estimate the wind-induced vibration factor and also can be used for the calculation of the acceleration.This study provides a reference for the checking calculation of the wind-induced vibration for base-isolated tall buildings in the elastic range.

关 键 词：高层建筑 基底隔震 风致响应 等效静风荷载 背景因子 

分 类 号：TU973[建筑科学—结构工程]