多遇地震作用下外墙外保温系统的地震作用分析

Seismic Analysis of External Insulation System Installed on Exterior Wall under Frequently Occurred Earthquake

为了研究在我国建筑节能中广泛采用的外墙外保温系统在地震作用下的抗震安全性能,该文分析了该保温系统在多遇地震作用下的弹性反应。根据理论分析推导出外墙外保温系统在地震作用下的运动方程,并应用MATLAB软件编制了时程分析程序。通过工程算例,分析了外墙外保温系统对主体结构周期的影响,计算了主体结构和保温系统在多遇地震作用下的位移反应。计算结果表明:安装外墙外保温系统后将使原建筑结构各阶振型所对应的周期明显变大,保温系统与主体结构之间相对位移最大处出现在建筑物顶部。

In order to study the seismic performances of the external insulation system that is extensively applied in China under earthquake action, the elastic responses of the insulation system under frequently occurred earthquake action are investigated here. From the theoretic analysis, the equation of motion for the external insulation system under earthquake action is derived, and the program for a time history analysis is developed by MATLAB software. Using an engineering example, this paper analyses the influence of the external insulation system on the periods of main structures and computes the displacement responses of both main structures and insulation systems under earthquake action. The results show that the insulation system can evidently increase the vibration periods of structure modes and the maximum relative displacement between main structures and insulation systems is on the top floor in the building.