【摘要】 根据径向荷载作用下双肋组拼圆弧拱的几何方程、物理方程,考虑结构的总体变形能和构件的局部变形能,利用最小势能原理推导拱桥结构在竖向均布荷载作用下的侧倾稳定临界力的近似解析解,讨论了横撑设置、横撑刚度等因素对稳定性的影响。结合六座大跨度钢管混凝土双肋拱桥在施工阶段和营运阶段的稳定性有限元分析结果,探讨了横撑形式与类型对双肋拱桥的稳定系数和失稳模态的影响规律,对该类桥梁的横撑设置提出了参考建议。更多还原

【Abstract】 This paper deals with the lateral buckling analysis of the space arch structure composed of double main arch ribs with transverse braces. The elastic critical buckling load of this kind of structures is deduced according to the principle of minimum potential energy. The influences of the space length and the stiffness of bracing beams on the lateral stability of structure are studied. Based on the results of finite element analysis of 6 concrete filled steel tubular arch bridges, several design recommendations on the arrangement of bracing beams are proposed to augment stability.更多还原