SSI效应对高层框架结构抗震性能的影响

Influence on seismic performance of high-rise frame structure based on SSI effect

对高层框架结构建立考虑土-结构相互作用(soil-structure interaction, SSI)的三维数值模型,用有限元与无限元耦合的方法模拟半无限域土体。通过地震波反演得到基岩处地震波,输入模型后,研究SSI对上部高层框架结构抗震性能的影响。结果表明:结构系统的动力特性发生明显变化,频率减小、周期延长,在EI Centro地震波作用下分别考虑SSI效应和不考虑SSI效应,上部结构层间位移的差别在可控范围内。

A three-dimensional numerical model considering soil-structure interaction(SSI) is established for high-rise frame structures. The coupling method of finite element and infinite element is used to simulate the semi-infinite soil. The seismic wave at the bedrock is obtained by seismic wave inversion, and the effect of SSI on the seismic performance of the upper high-rise frame structure is studied after the seismic wave is input into the model.The results show that the dynamic characteristics of the structural system change obviously, the frequency decreases and the period extends. Under the action of EI Centro seismic wave, considering SSI effect and not considering SSI effect respectively, the difference of the displacement between floors of the upper structure is within the controllable range.