Abstract This paper presents a numerical study on the performance of the multi-storey steel frame in sudden multi-column-removal (MCR) scenarios. The reliability of the numerical analyses are initially validated against experimental results. The effects of the removed column number, column location and magnitude of the applied load on the robustness of the frame are discussed. Results from numerical analyses can provide references to the collapse-resistant design of steel frames in the following two aspects. The one is the allowable maximum number of failure columns in robustness assessment of the steel frame. The other is the typical column-removal scenarios which should be particularly considered in practical design. It is found that for steel moment frame with design loads, it will collapse in some four-column-removal scenarios. Hence four-column-removal scenarios should be avoided by taking certain construction measurements in practical design. Two and three-column-removal scenarios should be particularly considered when assessing the robustness of the frame. For steel moment frame with twice design loads, the frame will collapse in any two-column-removal scenarios. Moreover, in small load case, the frame has the greatest robustness due to corner-column-related losses. While in large load case, the robustness of the frame is the strongest in interior column losses. The linearly consecutive column losses have less adverse effects on the robustness of the frame than the rectangular-shaped column-removal scenarios.

中文翻译：

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多柱拆除情况下钢力矩框架的稳健性

摘要 本文对多层钢框架在突然多柱拆除（MCR）情况下的性能进行了数值研究。数值分析的可靠性最初是根据实验结果进行验证的。讨论了移除的柱数、柱位置和施加载荷的大小对框架坚固性的影响。数值分析结果可以从以下两个方面为钢框架的抗倒塌设计提供参考。一是钢框架健壮性评估中允许的最大破坏柱数。另一个是典型的除柱场景，在实际设计中应特别考虑。研究发现，对于有设计荷载的钢力矩框架，在一些四柱拆除的情况下会发生倒塌。因此，应通过在实际设计中进行某些施工测量来避免四柱拆除情况。在评估框架的稳健性时，应特别考虑两列和三列移除方案。对于具有两倍设计载荷的钢力矩框架，框架在任何两柱拆除情况下都会倒塌。此外，在小载荷情况下，由于角柱相关损失，框架具有最大的稳健性。而在大载荷情况下，框架的坚固性是内部柱损失中最强的。与矩形柱移除方案相比，线性连续柱损失对框架稳健性的不利影响较小。在评估框架的稳健性时，应特别考虑两列和三列移除方案。对于具有两倍设计载荷的钢力矩框架，框架在任何两柱拆除情况下都会倒塌。此外，在小载荷情况下，由于角柱相关损失，框架具有最大的稳健性。而在大载荷情况下，框架的坚固性是内部柱损失中最强的。与矩形柱移除方案相比，线性连续柱损失对框架稳健性的不利影响较小。在评估框架的稳健性时，应特别考虑两列和三列移除方案。对于具有两倍设计载荷的钢力矩框架，框架在任何两柱拆除情况下都会倒塌。此外，在小载荷情况下，由于角柱相关损失，框架具有最大的稳健性。而在大载荷情况下，框架的坚固性是内部柱损失中最强的。与矩形柱移除方案相比，线性连续柱损失对框架稳健性的不利影响较小。而在大载荷情况下，框架的坚固性是内部柱损失中最强的。与矩形柱移除方案相比，线性连续柱损失对框架稳健性的不利影响较小。而在大载荷情况下，框架的坚固性是内部柱损失中最强的。与矩形柱移除方案相比，线性连续柱损失对框架稳健性的不利影响较小。