In order to provide an efficient method to study the progressive collapse of reinforced concrete frame struc-tures under sudden accidents,a simplified analysis method based on plastic hinge was proposed,and the progressive col-lapse 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 effi-cient method for studying structural progressive collapse patterns under sudden accidents.
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