多层钢框架结构基础隔震动力时程分析

Dynamic Time- history Analysis of Base Isolated Multi-layer Steel Frame Structure

根据动力学原理和有限元理论,建立多层钢框架房屋的基础固定和基础隔震结构有限元模型,利用SAP2000对模型进行水平方向的地震动力时程分析。分析结果表明,采用基础隔震技术后,多层钢框架结构房屋的水平地震反应明显低于原基础固定结构。其上部结构的自振周期显著延长,层间剪力和基底剪力大大减小,层间相对位移和楼层加速度远小于基础固定结构且各层基本保持不变,上部结构基本呈现整体平动状态。

Based on the dynamics and finite element theo- ry, the finite element models of base - fixed and base - isolated structure of a multi - layer steel frame house were set up, and the dynamic history analysis of horizontal seismic response of the models was carried on using SAP2000. The results show that the upper structure＇s horizontal earthquake responses are significantly lower than the original base -fixed structure＇s after using base i- solation technology. The natural vibration period of the upper structure is dramaticlly prolonged, interlaminar and base shear decrease greatly, the relative storey displacement and accelera- tion is far less than the base - fLxed structure＇s , and almost remain unchanged between layers, the upper structure presents the state of the overall translation.