地震动相位谱与相位差谱分布特征的研究

引入相位差谱主值的概念，讨论了相位（差）谱与其主值分布函数之间的关系，通过将相位（差）谱与其主值加以区别，能有效地克服过去相位谱与相位差谱概率特征的不协调性。在假定相位差谱服从正态分布的条件下，对相位（差）谱主值的概率分布进行数值计算与模拟，结果与Ｏｈｓａｋｉ对实际地震记录的统计结果非常接近，说明本文的思想是合理的。

Study of Properties of Phase Spectrum and Phase Difference Spectrum of Strong Ground Motions

By introducing the concept of main value of phase difference spectrum,the relationship between probabilistic distribution functions of phase spectrum or phase difference spectrum and their main values are discussed.The incompatibility of probabilistic properties of phase spectrum and phase difference spectrum can be overcome effectively by distinguishing phase spectrum and phase difference spectrum from their main values.The distribution functions of main values of phase and phase difference are calculated and modelled on the assumption that the probability distributions of phase difference spectrums are normal,the results is very similar to Ohsaki's statistical results from real strong ground motion records .It means that the approach of this paper is reasonable.