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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。
According to the dynamic theory and the finite element theory, the finite element model of foundation fixed and base-isolated structure of multi-story steel frame building is established. The horizontal dynamic model of earthquake dynamic time history is analyzed by SAP2000. The analysis results show that the horizontal seismic response of multi-story steel frame buildings is obviously lower than that of the original foundation after adopting the base isolation technology. The natural period of the superstructure is significantly prolonged, the interlaminar shear force and the base shear force are greatly reduced, the relative displacement between floors and the acceleration of the floor are far less than those of the basic fixed structure, and the layers are basically unchanged, and the superstructure basically exhibits the overall translational state .