【摘要】 该文建立了钢管混凝土柱-钢梁平面框架结构的有限元计算模型,探讨了该类组合框架的倒塌判断标准。基于构件拆除法对组合框架结构进行了计算,研究了倒塌工况下组合框架结构的变形和内力分布规律。结果表明:钢管混凝土柱-钢梁平面框架结构剩余变形主要集中在梁端。按照规范设计的组合框架在不考虑节点区破坏前提下满足抗倒塌要求,但节点区内力变化明显,成为倒塌设计中的关键部位之一。更多还原

【Abstract】 A finite element analysis(FEA) model of CFST(concrete filled steel tube) column-steel beam planar frames is presented in this paper.The collapse criteria of this kind of planar frame is discussed.Alternate path method is used to simulate the collapse of the composite frame.The distribution of the deformation and internal force of the frames are analyzed.The results show that the deformation of the left frame structure mainly concentrates at the beam ends.The composite frame according to design codes can satisfy the requirement of collapse when the failure of joints is ignored.However,the forces increase significantly in the joints next to the lost column,which become one of key parts in the design considering collapse.更多还原