梁柱连接是内力重分配的关键构件，其性能会对结构的抗连续倒塌能力带来显著的影响。本文建立了三层钢-混凝土组合框架的有限元模型，对其进行了动力拆柱分析，分别研究了连接刚度和强度对于组合框架抗倒塌性能的影响。结果表明：连接刚度和强度对于边跨层间组合效应的影响要大于内跨悬索作用的影响；连接刚度对于梁中轴力的发展程度具有明显影响；连接性能的改变不会影响各楼层间的独立承载；连接性能的改善可以减小在内力重分配过程对于边界约束条件的依赖程度。

The beam-column connection plays a key role in the redistribution of internal force,and its behavior has a significant influence on the performance of structures in resisting progressive collapse.In this paper,a finite ele- ment model is constructed for a three-storey steel-concrete composite frame,and the influence of the connection stiffness and strength on the anti-collapse behavior of the composite frame is analyzed by means of the dynamic-col- umn-removal method.The results show that (1) the influence of the connection stiffness and strength on the com- posite effect between the floors in a side span is greater than that on the catenary action in inner spans; (2) the development of the axial force in the beams depends on the connection stiffness,rather than the connection strength; (3) the change of the connection behavior has no influence on the load-carrying independence of each floor; and (4) the improvement in the connection behavior can reduce the demand for the boundary restraint con- dition during the redistribution of internal force.