In order to investigate the vertical resistance to progressive collapse and the evolution of its robustness in the process of loading, a quantitative method of the robustness index of diagrid structure is established based on the mechanical properties of the components and the vertical bearing capacity of the structure. A scale experiment model of diagrid tube structure is established in laboratory which verified the availability of the proposed robustness quantification method. Results demonstrated that, the axial force of inclined column is pressure, and the axial force of ring beam is tension under vertical load. The ring beam is the main restraint to the side bulge of the diagrid structure. The welded strength of the inclined column have great influence on the vertical bearing capacity, so it is necessary to consider the reduction of the strength of welded joint. The influence of the welding line of the joint can lead to the plastic stage of the local components of the structure, which makes the structural robustness worse. In addition, the experimental study and numerical simulation results verify that the proposed method of robustness coefficient quantification for diagrid tube structure can accurately and reasonably evaluate the resistance of vertical progressive collapse performance.

中文翻译：

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高层建筑中斜向结构渐进倒塌的竖向抵抗力的稳健性分析

为了研究竖向抗连续倒塌的能力及其在荷载作用下的稳健性演变，基于构件的力学性能和结构的竖向承载力，建立了斜交结构稳健性指标的定量方法。 。在实验室中建立了斜交管结构的规模实验模型，该模型验证了所提出的鲁棒性量化方法的可行性。结果表明，在竖向荷载作用下，斜柱的轴向力为压力，环形梁的轴向力为拉力。环形梁是斜交结构侧面隆起的主要约束。斜柱的焊接强度对竖向承载力有很大的影响，因此有必要考虑降低焊接接头的强度。接头的焊接线的影响可能导致结构局部部件的塑性阶段，从而使结构坚固性变差。此外，实验研究和数值模拟结果验证了所提出的斜交管结构鲁棒性系数量化方法可以准确合理地评估竖向渐进倒塌性能的抵抗力。