【摘要】 在一维虚拟激励法的基础上,通过激励功率谱的分解,建立多维非平稳地震激励作用下结构随机响应的虚拟激励法。根据演变随机激励的调制函数取不同形式,推导不同的特解精细积分格式,并混合应用这些格式于结构响应时变功率谱分析,可获得高效精确的数值结果。最后,通过算例讨论地震动各分量相关性对非对称结构地震响应的影响,得到一些有意义的结论。更多还原

【Abstract】 Based on one-component pseudo-excitation method,the pseudo-excitation method with multi-component and mean modulation non-stationary seismic excitation was developed by the use of PSD separation,and a number of high-precision quadratures were developed corresponding to various evolutionary random excitations.A mixed use of such quadratures led to accurate and efficient analyses of structural time-dependent power spectral densities.At last,a numerical example was introduced to discuss the effect of correlation of the ground motion components on the seismic responses of asymmetric structure,and several significant conclusions were given.更多还原