多点输入下大跨空间索结构的虚拟激励法

PSEUDO-EXCITATION METHOD FOR RESPONSE ANALYSIS OF SPACE CABLE STRUCTURES UNDER MUTIPLE SUPPORTS EXCITATION

采用虚拟激励法分析大跨空间索结构的随机地震响应,从结构节点位移响应方差和加速度功率谱两个方面考查了一致输入与非一致输入下结构响应的差异,得出了一些重要结论。同时,计算还表明虚拟激励法是一种高效且精确的方法,对于分析振型密集的大跨空间索结构在多点输入下的地震响应是很适合的。

The pseudo-excitation method is applied in the random seismic response analysis of space cable structures. The differences of the structure response under multiple supports excitation and simple support excitation are studied from two aspects of displacements response variance and acceleration power spectrum. Some important conclusions are gained. It is also shown that the pseudo-excitation method is efficient and precise and can be applicable to the random seismic response analysis of the complicate structures under multiple supports excitation, such as space cable structures with dense vibration modes.