钢筋混凝土平面框架结构连续倒塌规律的塑性铰简化分析方法

A Simplified Plastic Hinge Analysis Method for the Progressive Collapse Patterns of Reinforced Concrete Planar Frame Structures

为了给突发意外事件下钢筋混凝土框架结构的连续倒塌研究提供一种高效的数值分析方法,提出了基于塑性铰的结构倒塌简化分析方法,总结了不同拆除工况下平面框架结构的连续倒塌规律。利用精细化有限元模型验证了基于塑性铰的简化分析方法的可靠性,然后采用该简化方法分析了平面框架结构连续倒塌的塑性铰发展规律以及最终倒塌状态,最后讨论了底层拆柱比例以及侧边拆柱比例对结构连续倒塌的影响。结果表明,基于塑性铰的简化分析方法具备较高的计算精度,可以为结构在突发意外事件下的连续倒塌规律研究提供高效的分析手段。

In order to provide an efficient method to study the progressive collapse of reinforced concrete frame structures under sudden accidents,a simplified analysis method based on plastic hinge was proposed,and the progressive collapse patterns of planar frame structures under different demolition cases was summarized.The accuracy of the proposed method was verified by the refined finite element model.Then the evolution of plastic hinge and the final collapse state of the structure were analyzed by the proposed method.Finally,the effects of the proportion of columns removed at ground floor and the proportion of columns removed at the sides on the structural progressive collapse were discussed.The results show that the simplified analysis method based on plastic hinges has high computational accuracy,and can provide an efficient method for studying structural progressive collapse patterns under sudden accidents.