近断层地震作用下高层建筑结构地震响应分析  

Analysis of seismic response of high-rise building to near-fault ground motions

作　　者：卢明奇[1] 田玉基[1] 杨庆山[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《哈尔滨工业大学学报》2007年第2期314-317,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50478063);北京交通大学科技基金资助项目(2006XM024)

摘　　要：通过对13条近断层地震波进行分析,可见近断层地震波反应谱通常具有较宽的加速度敏感区.为研究高层建筑结构在近断层地震作用下的地震响应,采用上述13条近断层地震波,利用通用有限元分析软件SAP2000对20层Benchmark结构模型进行时程分析,发现随着地震波的PGV/PGA值增大,结构的顶层最大位移和基底剪力最大值均增大,说明结构的地震反应随着近断层地震波反应谱加速度敏感区的变宽而增大.对于设置了非线性粘滞阻尼器的高层建筑,当其基本周期处于近断层地震波的位移敏感区以内时,位移敏感区越窄,则非线性粘滞阻尼器的减震效果越好.The analysis of 13 near- fault earthquake records shows that the response spectra of near -fault earthquake waves usually have wider acceleration sensitive regions. In order to study the responses of highrise buildings to near - fault ground motions, time history analysis of a 20 - story Benchmark model under the above 13 near -fault earthquake records was carried out with general finite element analysis software SAP2000. It can be found that both maximum roof displacement and maximum base shear of structures will go up with the increase of PGV/PGA ratio. This indicates that the seismic responses of high - rise structures increase as the acceleration sensitive regions widen. When the fundamental periods of structures equipped with nonlinear viscous dampers fall within the displacement sensitive regions of near - fault ground motions, the narrower the displacement sensitive region is, the better the effect of nonlinear viscous dampers gets.

关 键 词：近断层地震 高层建筑 位移敏感区 粘滞阻尼器 

分 类 号：TU311.3[建筑科学—结构工程]