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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。
In this paper, the finite element model of CFST column-steel beam plane frame structure is established, and the criterion of collapse of such composite frame is discussed. The composite frame structure is calculated based on the component dismantling method, and the deformation and internal force distribution of the composite frame structure under collapse condition are studied. The results show that the residual deformation of CFST column-steel beam plane frame structure mainly concentrates on the beam end. The composite frame designed according to the specifications meets the requirement of anti-collapse without considering the damage of the node area, but the internal force of the node area changes obviously and becomes one of the key parts in the collapse design.