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该文针对压弯作用下闭合截面圆弧拱的平面外弹性屈曲性能及稳定设计方法进行研究。首先通过势能驻值原理分析均匀轴压力和弯矩同时作用下,钢拱的平面外弹性屈曲性能。在此基础上,在弹塑性范围内讨论弯矩对钢拱的平面外稳定削弱作用,推导得到考虑弯矩作用的压弯钢拱正则化长细比,进而将压弯钢拱的平面外稳定问题简化为纯压钢拱的稳定问题。该文提出的压弯钢拱平面外稳定设计方法与数值分析计算结果吻合较好,可用于钢拱的平面外稳定承载力设计。
In this paper, the out-of-plane elastic buckling performance and the stable design method of closed-section arc arch under bending load are studied. Firstly, the out-of-plane elastic buckling behavior of steel arch under uniform shaft pressure and bending moment is analyzed by the principle of potential energy stationing. Based on this, we discuss the out-of-plane smoothing weakening effect of bending moment on the steel arch in the elastic-plastic range and deduce the regularized slenderness ratio of the bent steel arch considering the bending moment, and then stabilize the out-of-plane stability of the bending steel arch The problem is reduced to the problem of the stability of pure steel arch. The proposed method for out-of-plane stability of the curved steel arch proves to be in good agreement with the numerical results and can be used to design the out-of-plane stability of steel arch.