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对于截面上同时存在轴力与弯矩共同作用的抛物线钢管混凝土压弯拱的失稳临界荷载,采用截面内力的相关方程进行了等效梁柱法的计算;对于相关方程中的稳定系数,采用了考虑矢跨比因素的系数K1和初始缺陷因素的系数K2的乘积形式来表达;对采用不同钢管混凝土结构理论体系中的相关方程进行拱的非线性失稳临界荷载计算进行了讨论。通过与试验结果和有限元结果的对比表明,该文所提出的等效梁柱法能方便且较精确地计算抛物线压弯钢管混凝土拱的极限承载力。
For the critical load of instability of parabolic CFST arch joint with both axial force and bending moment in the section, the equivalent beam-column method was used to calculate the equivalent beam-column method. For the stability coefficient of the correlation equation, The factor of cross-over factor K1 and the coefficient of initial defect factor K2 are expressed in terms of products; the calculation of the critical load of nonlinear instability of arch using different equations of CFST system is discussed. The comparison between the experimental results and the finite element results shows that the equivalent beam-column method proposed in this paper can be used to calculate the ultimate bearing capacity of parabolic CFRP arch conveniently and accurately.