框架结构加层后的非线性动力分析

Nonlinear Dynamic Analysis of Frame Structure after Adding Storeys

钢筋混凝土框架结构采用轻钢结构加层后,结构的动力性能将发生较大变化,需要对加层后的整体结构进行分析。通过对3种结构(即无加层的原钢筋混凝土框架结构、用钢结构加层后的整体结构、钢结构加层并设置阻尼器的结构),选用地震持时为12 s,地震最大加速度为220 gal,分别进行了地震反应时程分析计算。结果表明,设置阻尼器的比未设置阻尼器的轻钢加层结构的顶层位移和加速度都在显著减小。阻尼器的设置,可增加结构的耗能能力以及减小顶部层间位移,从而达到对结构振动控制的目的。

The RC frame structure after adding storeys with the light steel structure will change greatly in the dynamic performance,it is necessary to analyze the integral structure.Here,three different integral models,such as the original RC frame structure and the structure after adding storeys with or without viscous dampers on the top of it,are compared and analyzed using the timehistory analysis method under earthquake.The results show that the dampers can significantly increase the capacity of energy consumption of the structure,and reduce the displacement between the top layers,so the vibration control of the structure can be achieved.