摘要
在小波包分解技术和简谐波动力计算的基础上,对地震作用下单自由度体系结构的动力响应特点进行研究.结果表明,利用小波包分解技术的拟合简谐波对地震动的响应分析是可行的.地震动可引起长周期结构很大的位移响应,这种位移响应有两个显著的特点:①数值上可能超过共振位移达到最大;②最大位移发生的时间通常落后于地震动最大峰值的时间(时延),甚至在某些情况下,地震动完全消失之后,结构位移响应才达到最大,此时位移响应由瞬态振动控制.此外,还对惯性力、阻尼力和弹性力在结构中的作用进行了初步分析.
Based on the technique of wavelet pack decomposition and the dynamic calculation of har- monic wavet, the characteristics of dynamic response in single -degree -of- freedom（SDOF） system acted by earthquake is presented in this paper. The resuhs shown that fitted simple harmonic wave based on the technique of wavelet pack decomposition analysed in the response of earthquake motion is feasible; earthquake motion can create greatly displacement response in long -periodic structure. The displacement response has two obvious characteristics： （1） the value may exceed the displacement in sympathetic vibration and reach the maximum; （2） the maximal displacement time delays the maximal earthquake motion, even under some situation, the maximal displacement response occurs behind disappearance of earthquake motion, then displacement response controlled by transient one. In current paper, there is analysis on action of inertia force, damping force and elastic force in structure.
出处
《福州大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第5期752-757,共6页
Journal of Fuzhou University(Natural Science Edition)
关键词
单自由度
瞬态反应
长周期结构
地震动
反应谱
single - degree - of - freedom （SDOF）
transient response
long - periodic structure
earthquake motion
response spectrum
