A spatial steel frame with concrete slab and special-shaped multi-partition concrete filled steel tubular columns was tested in a simulated scenario of progressive collapse. The load-deformation relationship of the frame with damaged middle column under vertical load is discussed. Parametric analysis is also conducted by using a validated FE model. The results show that the failure of the specimen resulted from the fracture of the bottom beam flange eventually. The configuration of side plate connection and multi-partition concrete filled steel tubular column both could provide a reliable load-redistribution path for additional loads due to single column loss. The designed frame exerts good robustness to resist the collapse resulting from middle column loss. The simulation shows that single-column removal would cause additional lateral force and moment on the adjacent columns, besides axial force. The length of side plate exhibits more influence on the performance of the frame than the thickness of side plate.

在连续倒塌模拟场景中对具有混凝土板和异形多隔断钢管混凝土柱的空间钢框架进行了测试。讨论了竖向荷载作用下中柱损坏框架的荷载-变形关系。参数分析也是通过使用经过验证的有限元模型进行的。结果表明，试件的破坏最终是由底梁翼缘断裂引起的。侧板连接和多分区钢管混凝土柱的配置都可以为由于单柱损失引起的额外荷载提供可靠的荷载重新分配路径。设计的框架具有良好的鲁棒性，可以抵抗因中柱损失而导致的倒塌。模拟表明，除轴向力外，单柱拆除还会对相邻柱造成额外的侧向力和力矩。侧板的长度对框架性能的影响大于侧板的厚度。