【摘要】 地震动是一种典型的非平稳随机过程,其特性与结构的场地土条件、远近震等因素密切相关.文章主要考虑了场地土条件对地震动功率谱的影响,采用小波分析的方法,计算演变随机地震动激励对应的小波系数,并生成了地震动平动激励和转动激励的加速度时程,以之作为等效激励输入,对一个Ⅱ类场地上的不规则结构进行了仿真分析.结果表明,对于不规则结构而言,地震动激励的转动部分和非平稳特性对结构的动力响应有显著的影响.更多还原

【Abstract】 Earthquake shock is a typical non-stationary random process,its features mainly depend on the insite earth conditions and other affecting factors,such as the distance with the earthquake center. In this paper,the in-site condition affect is incorporated into the power spectral density of seismic acceleration,and the wavelet coefficients of the evolutional random seismic excitations are calculated,both of the translational and torsional seismic acceleration time histories are reconstructed by using wavelet transform method. An irregular structure on site type II is simulated by using these excitations as equivalent inputs. The results show that the torsional input and the evolutionary feature of the excitations have great effects on the dynamic responses of the structure.更多还原