基于拆除构件法对钢框架连续倒塌动力放大系数的研究

Study on dynamic increase factor of steel frame progressive collapse based on alternate path method

为研究钢框架结构连续倒塌的动力效应,基于我国规范CECS2014与美国规范GSA2013动力放大系数取值的差异,利用SAP2000分别讨论了框架柱失效时间与位置、建筑层数以及节点转动刚度对动力放大系数的影响.分析结果表明:随着失效时间的增加,动力放大系数有所减小,且角柱失效时结构动力响应最大;节点转动刚度的减小对结构抗连续倒塌的能力产生不利影响,变形能力有所增强,但对动力放大系数取值影响不大.

To study the dynamic effect of progressive collapse of steel frame structure,considering the differance of the increase factor between Chinese standard CECS 2014 and the GSA2013.SAP2000 is used to discuss the frame column failure time and location,building layers and node stiffness influence on the dynamic increase factor.The results show that with the increase of the failure time,the dynamic increase factor decreases,and the maximum failure of structural dynamic response occurs.The decrease of joint rotation stiffness has a negative influence on the progressive collapse resistance of structures,and enhances the deformation capacity,but has little effect on the dynamic increase factor.