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为研究结构在关键构件失效后的抗连续倒塌机制,基于ABAQUS纤维梁-柱单元建立了钢管混凝土柱-钢梁框架的有限元模型,钢材及核心混凝土材性分别调用课题组基于ABAQUS软件开发的材料本构子程序i Fiber LUT中的i Steel05和i Concrete01。采用Pushdown分析方法,对长边中柱失效、短边中柱失效、内部柱失效和角柱失效等4种典型工况下的连续倒塌进行了分析,研究典型柱失效后剩余结构的抗连续倒塌机制。研究结果表明:纤维梁-柱单元模型可以精准地分析空间框架连续倒塌性能。4种柱工况下结构的抗连续倒塌能力由大到小为:短边中柱失效、内部柱失效、长边中柱失效、和角柱失效。
In order to study the anti-continuous collapse mechanism of the structure after the failure of the key components, the finite element model of the concrete-filled steel tubular column-steel beam was established based on the ABAQUS fiber beam-column element. The steel and core concrete materials were respectively called by the research group based on ABAQUS software Material Constitutive Program i Steel05 and i Concrete01 in the Fiber LUT. Pushdown analysis method is used to analyze the continuous collapse under four typical conditions, such as the failure of the long column in the middle column, the failure of the middle column in the short column, the failure of the inner column and the failure of the corner column, and the mechanism of continuous collapse of the remaining structure after the failure of the typical column . The results show that the fiber beam-column element model can accurately analyze the continuous collapse of the space frame. The anti-collapse capability of the structure under four column conditions is as follows: failure of the short side center column, failure of the inner column, failure of the long side column and failure of the corner column.