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对结构进行整体抗连续性倒塌性能研究,首先要确定结构在外部荷载作用下可能发生的最不利初始损伤模型,即结构体系中某一构件或者子结构在外荷载作用失效后最有可能引起整个结构体系发生连续性倒塌破坏。基于构件失效前后结构应变能的改变量和构件失效影响面积的大小,通过计算构件重要性系数确定了结构的最不利初始损伤模型。在此基础上,以ABAQUS有限元分析软件为求解平台,采用非线性纤维梁-柱单元对一8层钢管混凝土空间框架结构进行连续性倒塌分析。结果表明:钢管混凝土框架柱构件的重要性系数明显大于梁构件,底层中柱构件重要性系数最大,通常认为比较关键的角柱构件并没有出现在关键地位;通过对3种典型初始损伤模型下钢管混凝土框架连续性倒塌分析发现,关键构件失效后,框架梁柱发生内力重分布,而且卸载传力路径遵循就近原则。
To study the overall anti-collapse property of the structure, we first determine the most unfavorable initial damage model of the structure under the external load. That is to say, the most unfavorable initial damage model of the structure in the structure system is most likely to cause the entire structure after the failure of the external load System collapse occurred in a row collapse. Based on the change of structural strain energy before and after failure and the size of the area affected by component failure, the most unfavorable initial damage model of the structure was determined by calculating the component importance coefficient. On this basis, ABAQUS finite element analysis software was used to solve the platform, and a non-linear fiber beam-column element was used to analyze the continuous collapse of an 8-story CFST structure. The results show that the importance coefficient of CFST column members is obviously larger than that of beam members, and the bottom column has the largest importance coefficient. It is generally considered that the more critical corner column members do not appear in the key position. By analyzing three typical initial damage models, Continuous collapse analysis of concrete frame found that the failure of the key components, the frame beam column internal force redistribution, and unloading force transmission path to follow the principle of proximity.