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利用基于纤维模型的梁柱单元建立了框架结构的连续倒塌分析模型。基于Pushdown分析方法,开展了不同破坏工况下的连续倒塌分析,研究局部破坏后剩余结构的连续倒塌抗力机制。分析结果表明,破坏位置不同,剩余结构的抗倒塌机制也不同。在中柱破坏的工况下,剩余结构具备由抗弯机制与悬链线机制提供的抗倒塌承载能力,并且在失效跨内仅有底部第1、第2层梁演化出悬链线效应机制并提供竖向抗倒塌承载力,其余梁体在抗弯机制失效后,未演化出悬链线效应机制。在边柱破坏的工况下,剩余结构仅具备由抗弯机制提供的抗倒塌承载能力,失效跨内梁体均未演化出悬链线效应机制。
The continuous collapse analysis model of frame structure was established by using beam-column element based on fiber model. Based on the Pushdown analysis method, the continuous collapse analysis under different failure conditions is carried out to study the continuous collapse resistance mechanism of the remaining structures after partial failure. The analysis results show that the mechanism of anti-collapse of the remaining structures is different because of the different damage locations. In the case of failure of the center column, the remaining structure has the anti-collapse bearing capacity provided by the bending mechanism and the catenary mechanism, and only the bottom first and second floor beams in the failure span evolve the catenary mechanism And provide vertical anti-collapse bearing capacity, the rest of the beam in the failure mechanism after the failure, did not evolve the catenary effect mechanism. Under the damaged condition of the side columns, the remaining structure has only the anti-collapse bearing capacity provided by the bending resistance mechanism, and no catenary effect mechanism has been evolved in the failure of the internal beam body.