基于小波方法的多自由度体系地震动输入能量研究  

Wavelet-based research on ground motion input energy to MDOF system

作　　者：谢异同[1] 任键[1] 葛兴云[2] 

机构地区：[1]西安建筑科技大学土木学院 [2]山东省建筑设计研究院

出　　处：《世界地震工程》2012年第1期7-13,共7页World Earthquake Engineering

基　　金：国家自然科学基金资助项目(50478045)

摘　　要：对多自由度体系应用小波分解的地震激励,将地震动总输入能量表示为不同频段地震动输入能量的叠加。与单自由度体系相比,多自由度体系应用小波分解会产生较大的误差,这并不影响研究小波分解后各频段对单一固有振型输入能量的贡献。这样可以从频率的角度分析多自由度体系的地震动输入能量。By wavelet analysis method,the earthquake ground motion used for MDOF systems can be decomposed into several different frequency bands.The input energy of the record also can be written as the superposition of several energy inputs belongs to different wavelet components.In Comparison with the SDOF system,there exist a certain amount of errors when using wavelet to decompose displacement response of the MDOF system into different vibration modes,it does not affect the wavelet components＇ input energy contribution ratio to a single nature vibration mode.By this method,the theory foundation of energy input into the MDOF systems can be analyzed by time-frequency method;predominant period.

关 键 词：小波分解 多自由度体系 地震动输入能量 振型 卓越周期 

分 类 号：TU311.3[建筑科学—结构工程]