高层结构的鞭梢效应分析

ANALYSIS OF WHIPLASH EFFECT OF HIGH-RISE BUILDINGS

系统地探讨了结构产生鞭梢效应的原因 ,发现当突出物的基本频率与整体结构的固有频率相同或相近 ,并与地面扰频相接近时 ,最易发生鞭梢效应 ,通过适当调整结构的刚度或质量分布使突出物的频率与整体结构的频率的差值增大 ,可减少鞭梢效应的影响 。

It is explained why the whiplash effct occurs to building having prominent part on its top by analysis of building of multiple degrees of freedom on earthquake effect.It is shown that whiplash effect can occur when the fundamental frequency of prominent parts equals to a natural frequency of the entire structure containing main parts and prominent parts,and this frequency nearly equals to the earthquake frequencies.This is proved to be right by example.If decreasing the influence of whiplash effect,people shouldn't noly increase the stiffness of prominent parts while adjusting structure's stiffness and mass distribution by dynamic computation in order to make frequency difference of prominent parts and the entire structure become bigger.Thus,more reliable data could be supplied for design of structures.