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提出了一种基于有限元可靠度反分析求解钢管混凝土拱稳定安全系数的方法,并通过自编程序和通用有限元分析软件ABAQUS相结合将其实现。上述方法将拱的稳定安全系数引入稳定设计的极限状态方程,进而在给定目标可靠指标的前提下基于可靠度反分析求解该系数。对于已有的钢管混凝土拱模型试验,分别基于上述方法求解面内稳定和面外稳定对应的安全系数。计算结果表明,该方法具有较高的效率和较好的适用性;计算得到的拱面内稳定安全系数受加载方式的影响很小;采用弹性理论计算得到的拱面外稳定安全系数约为非线性理论计算结果的2倍;抗力不确定性和荷载不确定性对钢管混凝土拱稳定安全系数的影响均较大,且不考虑抗力和荷载不确定性影响的稳定安全系数偏于不安全。
A method to solve the stability coefficient of CFST arch based on the finite element reliability analysis is proposed. It is realized through the combination of self-programmed program and general finite element analysis software ABAQUS. The above method introduces the stability safety factor of the arch into the limit state equation of the stability design, and then the coefficient is solved based on the reliability analysis given the reliable target of the target. For the existing CFST arch model tests, the safety factor corresponding to in-plane stability and out-of-plane stability are respectively obtained based on the above methods. The calculated results show that the method has high efficiency and good applicability. The calculated internal stability factor is less affected by the loading method. The stable safety coefficient calculated by elastic theory is about The results show that the resistance uncertainty and the load uncertainty have a great influence on the stability safety factor of CFST arch, and the safety factor of stability without considering the influence of resistance and load uncertainty is unsafe.