摘要
将多点地震激励简化为平稳向量随机过程，针对其时－空相关特性．采用两步相关谱展开，使相关向量随机过程转化为正交向量随机过程．通过结构振型分解法直接求得结构随机响应；进一步可计算各种响应功率谱密度．本文方法不仅考虑了结构的多点激励及行波效应，而且考虑了结构振型之间的相关性，计算过程简单，是结构随机振动分析的一种有效方法．
The random earthquake multi-input is modeled as stationary random process vector. A two-step decomposition approach is proposed to transfer the correlative vector process into an independent one. The structural random response is obtained by mode-decomposition method. Furthermore, the power spectral densities of responses can be calculated directly. The proposed approach is an effective one, as it can deal with not only the multi-excitation problem and wave-propagation effect, but also the correlative one between structural modes easily.
出处
《世界地震工程》
CSCD
2001年第4期88-92,共5页
World Earthquake Engineering
