The research project was carried out to estimate the robustness of flat steel-framed structures in a selected accidental situation. For this purpose, a multistage approach based on experimental tests and numerical analysis was performed. As the main objective of the work, a numerical dynamic analysis of the steel frames was performed under a sudden and gradual internal column loss scenario. FEA models were created in Abaqus software using solid and shell elements. Computer analyzes were carried out in a number of different cases, taking into account the size of the structure, the type of joints, and the method of removing the column from the structure. Detailed results on the axial forces and rotation of the joints under analysis are presented, and the robustness of the structures is estimated. In all cases of frames with flush end-plate joints, an insufficient level of robustness was observed and failures of the structures were obtained. In the cases of application of extended end-plate joints in frame analysis, the required level of robustness was reached in all cases and the stop of collapse was obtained. Finally, practical recommendations for designing robust joints and the whole frame structure are presented.

该研究项目的目的是评估扁平钢框架结构在选定的意外情况下的坚固性。为此，进行了基于实验测试和数值分析的多阶段方法。作为这项工作的主要目标，在突然和逐渐的内部柱损失情况下对钢框架进行数值动力分析。FEA 模型是在 Abaqus 软件中使用实体和壳单元创建的。在许多不同的情况下进行了计算机分析，考虑到结构的尺寸、接头的类型以及从结构中拆除柱的方法。给出了所分析的接头的轴向力和旋转的详细结果，并估计了结构的鲁棒性。在具有齐平端板接头的框架的所有情况下，观察到坚固性水平不足，并且获得了结构的失效。在框架分析中应用延伸端板接头的情况下，在所有情况下都达到了所需的坚固性水平，并且获得了停止倒塌的效果。最后，提出了设计坚固接头和整个框架结构的实用建议。