A fully non stationary earthquake model based on the family of sigma oscillatory process is developed here. The conventional evolutionary PSDF is expressed as function of two different frequencies applying double Fourier transform to the associated auto covariance function. The response of structure to this general non-stationary PSDF is now utilizes to derive the non stationary response quantities. To elucidate the methodology in a focused and specific manner, a building frame subjected to ground motion due to El Centro 1940 earthquake is taken up and the results with proposed model are compared with that of evolutionary spectral density model.
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机译：这里开发了一种基于Sigma振荡过程系列的完全非平静的地震模型。传统的进化PSDF表示为将双傅级变换应用于相关的自动协方差函数的两个不同频率的函数。现在利用结构对该一般非静止PSDF的响应来得出非静止响应量。为了以聚焦和特定的方式阐明方法，对由EL Centro 1940地震进行地面运动进行的建筑物框架被占据，并且将所提出的模型的结果与进化光谱密度模型进行比较。
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