既有RC框架结构在地震作用下弹性反应的简化分析方法

A Simplified Method to Determine the Elastic Reaction of RC Frame Structures under Ground Motion

提出了采用连续体模型确定既有钢筋混凝土框架结构地震弹性反应的简化分析方法。该模型参数:剪切刚度系数K由实测的第一自振周期反推而得,结构的自重系数M由经验估算而得。利用振型分解反应谱法求得结构的最大层间位移;并借助opensees计算平台对该结构进行大量的时程分析计算,得到的最大层间位移与连续体模型计算结果符合度较好,证明了此简化方法的可行性。

For determining the elastic reaction under ground motion, the continuous linear-elastic model of RC frame structures under ground motion are established. Two parameters need to be conformed： the shear rigidity K can be computed using basic period surveied on the spot, and the mass of the structure M can be determined by practical estimate. Accordingly the seismic reaction of RC frame Structures can also be oabtained using the method of spectral analysis. And for validating the accuracy of the continuous model, transient analysis method is used under the platform of opensees software. The Simplified Method is proved to be valid by constrast opensees computational results.