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拱的平面外稳定极限承载力设计一直没有成熟的设计方法及规范指导。通过分析两铰圆管截面圆弧钢拱的平面外弹性屈曲性能,指出Timoshenko未考虑翘曲的经典解与有限元分析结果吻合很好。在弹塑性平面外稳定性分析的基础上,借鉴单轴对称截面轴心受压构件的弯扭屈曲设计方法,提出以面外屈曲荷载对应的正则化长细比为参数进行面外稳定性设计的方法。借鉴我国GB 50017—2003《钢结构设计规范》中柱子曲线的表达式,建立纯压两铰圆管截面圆弧拱稳定承载力的实用计算公式及设计曲线。
Arch stability of the ultimate bearing capacity of the design has not been mature design methods and normative guidance. By analyzing the out-of-plane elastic buckling performance of circular arch with two-sided circular tube, it is pointed out that Timoshenko’s classical solution without warping is in good agreement with the finite element analysis. Based on the analysis of elasto-plastic out-plane stability and the design method of flexural-torsional buckling of axially compressed members with uniaxial symmetry section, the out-of-plane stability design based on regularized slenderness ratio Methods. Based on the expression of column curve in “Code for Design of Steel Structure” of GB 50017-2003, the practical calculation formula and design curve of the steady bearing capacity of circular arc arch with purely two-hinged circular tube are established.