Once a column in building is removed due to gas explosion, vehicle impact, terrorist attack, earthquake or any natural disaster, the loading supported by removed column transfers to neighboring structural elements. If these elements are unable to resist the supplementary loading, they continue to fail, which leads to progressive collapse of building. In this paper, an efficient strategy to model and simulate the progressive collapse of multi-story reinforced concrete structure under sudden column removal is presented. The strategy is subdivided into several connected steps including failure mechanism creation, MBS dynamic analysis and dynamic contact simulation, the latter is solved by using conserving/decaying scheme to handle the stiff nonlinear dynamic equations. The effect of gravity loads, structure-ground contact, and structure-structure contact are accounted for as well. The main novelty in this study consists in the introduction of failure function, and the proper manner to control the mechanism creation of a frame until its total failure. Moreover, this contribution pertains to a very thorough investigation of progressive collapse of the structure under sudden column removal. The proposed methodology is applied to a six-story frame, and many different progressive collapse scenarios are investigated. The results illustrate the efficiency of the proposed strategy.

由于气体爆炸，车辆撞击，恐怖袭击，地震或任何自然灾害而拆除建筑物中的立柱后，拆除的立柱所支撑的载荷就会转移到相邻的结构元件上。如果这些元素无法抵抗附加荷载，它们将继续失效，从而导致建筑物逐渐倒塌。本文提出了一种有效的建模和模拟多层钢筋混凝土结构在突然拆除柱的情况下逐渐倒塌的有效策略。该策略可细分为多个相关步骤，包括故障机制创建，MBS动态分析和动态接触仿真，后者通过使用守恒/衰减方案处理刚性非线性动力学方程来解决。重力载荷，结构与地面的接触，以及结构-结构接触也要考虑在内。这项研究的主要新颖之处在于引入了失效函数，以及控制框架的机制创建直至其完全失效的正确方式。此外，该贡献涉及在突然拆除色谱柱的情况下对结构逐渐塌陷的非常彻底的研究。所提出的方法应用于六层框架，并研究了许多不同的渐进倒塌方案。结果说明了所提出策略的有效性。此贡献与在突然拆除色谱柱的情况下对结构逐渐倒塌的彻底研究有关。所提出的方法应用于六层框架，并研究了许多不同的渐进倒塌方案。结果说明了所提出策略的有效性。此贡献与在突然拆除色谱柱的情况下对结构逐渐倒塌的彻底研究有关。所提出的方法应用于六层框架，并研究了许多不同的渐进倒塌方案。结果说明了所提出策略的有效性。