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基于梁在悬索作用阶段的受力特点,推导了当支承柱突然破坏时,处于悬链线状态的梁的极限承载力公式,并进一步通过该公式导出了框架结构“拆除系数(RF)”的概念,用以定量判断构件在抗连续倒塌中的重要性程度。利用SAP2000通用有限元软件对一实际工程进行静力线性分析,分别模拟四种拆除工况,评估了结构的倒塌状况。结果表明,拆除系数算法的预测结果与一般工程经验一致,能够在一定程度上反映出构件的重要性指标。且计算简捷,便于应用。
Based on the characteristics of the beam during the action of the cable, the ultimate bearing capacity formula of the beam in catenary state is deduced when the supporting column is suddenly damaged, and the frame structure “RF” "Concept, to quantitatively determine the importance of components in the anti-continuous collapse. By using SAP2000 common finite element software, a static linear analysis of an actual project was carried out. Four kinds of demolition conditions were simulated respectively and the collapse status of the structure was evaluated. The results show that the prediction results of the removal coefficient algorithm are consistent with the general engineering experience, which can reflect the importance index of components to a certain extent. And calculation is simple, easy to use.