【摘要】 本文以宝鸡市和西安市地震小区划工作中获得的大量实测资料为基础,建立了一维随机土层结构模型,应用随机振动的理论和摄动法,就随机场地条件对土层地震反应分析的影响进行了初步的研究和讨论。结果表明,土壤力学参量的随机性对于土层地震反应分析的影响是不可忽略的,一般情况下,可造成土层地震反应分析的方差发生20%左右的变化,也可使土层结构的自振频率发生15%—40%左右的变化。因此,人们应当对土壤力学参量的随机性给予足够的重视。更多还原

【Abstract】 Based on practical data obtained in microzonation of Baoji City and Xi’an City, a random 1-D model for soil layer is set up in this paper. Using the theory of random vibration and the method of perturbation, the effect of random site condition on the earthquake response analysis of soil layer has been studied preliminarily. The results show that the randomness of soil mechanical parameters usually can make the variance of earthquake response on the surface of soil layer has a change of 20% around its mean value, and it also can make the free frequency of soil layer has a change between 15%～40%. So that, it should be paid more attention to the randomness of soil mechanical parameters on the earthquake response analysis of soil layer.更多还原