论文部分内容阅读
为了求解结构-土相互作用体系的地震作用,对基于规范-非平稳地震动模型的复模态频域法进行了系统研究.首先,建立了结构-土相互作用体系的运动方程,根据上部结构的地震响应以第一阶振型为主的特点,将其按第一振型展开;然后,针对所得运动方程为非对称质量与非经典阻尼矩阵的情况,用复模态法解耦;最后,采用与抗震规范设计反应谱的地震动参数一致的Clough-Penzien-三段式非平稳地震动随机模型在频域内进行了体系的随机地震响应分析,进而得到了结构的地震作用取值.通过一个例子来说明本文方法在结构-土相互作用体系地震作用取值的应用,同时分别给出了基础固定结构基于地震动模型和规范设计反应谱的地震作用取值来进行比较.
In order to solve the seismic effect of the structure-soil interaction system, the complex modal frequency domain method based on the canonical-non-stationary ground motion model is systematically studied.First, the equation of motion of the structure-soil interaction system is established, and according to the superstructure Of the first-order mode of vibration characteristics of the first, it will be the first mode unfolded; then, for the motion equation is asymmetric mass and non-classical damping matrix case, the complex modal method decoupling; Finally , The stochastic seismic response analysis of the system was carried out in the frequency domain using Clough-Penzien-three-stage stochastic seismic stochastic model consistent with the ground motion parameters of the earthquake-resistant design response spectrum, and then the seismic action value of the structure was obtained. An example is given to illustrate the application of the proposed method to the seismic response of structural-soil interaction system. The seismic responses of the fixed structure based on the ground motion model and the canonical design response spectrum are compared respectively.