有限持时地震动对长周期结构动力反应的影响  

Effects of finite duration earthquake on dynamic responses of structure with long period

作　　者：周瑞忠[1] 吴琛[2] 江连丁[1] 

机构地区：[1]福州大学土木工程学院,福建福州350002 [2]福建工程学院土木工程系,福建福州350002

出　　处：《地震工程与工程振动》2008年第1期146-151,共6页Earthquake Engineering and Engineering Dynamics

基　　金：教育部博士点专项科研基金项目(20040386004)

摘　　要：有限持时的实例提示我们结构的最大位移可能出现时滞现象,且工程结构的自振周期与出现结构最大位移的时间密切相关,特别在长周期结构中,位移主要受瞬态振动的控制。本文通过小波分解、振幅调整、线性叠加3步骤实现了地震动瞬态反应与稳态反应的分离,通过小波分量瞬态反应与反应谱研究,证实了长周期结构的最大位移不仅可能发生在共振情况下,也可能发生在外载激励已经消失,但结构的瞬态振动仍有较大余幅的情况下。瞬态振动对长周期结构位移反应的影响与持时呈密切的关系。It is indicated from the finite duration instance that time delay is possible in structural maximum displacement, Structural natural period is closely connected with the time of maximum displacement. Especially, in long period structures, displacement is mainly controlled by transient vibration. In this paper, the earthquake transient responses are got by wavelet transform, amplitude adjustment and linear superposition. It is approved that besides the sympathetic vibration, the maximum displacement of a long period structure could occur in the case that external loads stop but structural transient vibration still has great amplitude. Furthermore, for long period structures, there is close relationship between the transient vibration and the duration.

关 键 词：有限持时 长周期结构 动力反应 小波变换 瞬态反应 

分 类 号：P315.95[天文地球—地震学]