基于均匀调制随机模型的土与结构相互作用体系地震反应分析

ANALYSIS OF SEISMIC RESPONSE OF SOIL-STRUCTURE INTERACTION SYSTEM BASED ON THE UNIFORMLY MODULATION RANDOM PROCESS

通过假定土与结构相互体系受到均匀调制随机激励,把地基土作用转化为凝聚在基础边界上弹簧阻尼器,对相互作用体系进行了地震反应分析,得到了其时变均方根响应和响应演变谱。这一方法基本上反映了地震动的实际过程和结构体系响应的特性,不失为一种计算结构体系随机反应的有效算法。

In this paper, the random excitations acting on the soil-structure interaction system are assumed to be uniformly modulation random process. The effections of foundation soil are transformed for the spring-damper on base boundary, and the seismic responses of the soil-structure interaction system are analysed. The evolutionary spectra and the time-variant cross-correlation function of the response for the soil-structure interaction system are obtained. The characteristics of seismic ground motion process and structural response are described by using the method, and it is effective algorithm for the random response analysis.