【摘要】 为研究空间曲线连续梁异型拱组合桥参数及整体稳定问题,建立了空间曲线连续梁异型拱组合桥有限元模型,分析不同参数(构件刚度、吊索面积、吊杆非保向力、荷载的性质及分布、拱脚约束等)对异型拱桥整体稳定性的影响.结果表明:考虑活载作用后结构稳定系数由24.39降到21.67下降12%,结构恒载是结构整体稳定性的决定性因素;曲线梁外倾产生的横向力导致稳定系数减小了15.2%,是组合桥面外失稳的主要因素之一;拱脚全部固结优于部分固结稳定性,拱脚的约束能力越强结构稳定性能越好;拱肋横向抗弯刚度变化导致稳定系数增量最显著,因此横向抗弯刚度是组合桥结构稳定的控制因素.更多还原

【Abstract】 In order to study parameters and overall stability capacity of composite bridge with curved continuous beams and special-shaped arches, the finite element model of a composite bridge with curved continuous beams and special-shaped arches was established in this paper. The influence of different parameters(stiffness of members, area of slings, non-directional loads of hanger rod, behavior and distribution of loads, constraint of arch foots, etc.) on the overall stability of special-shaped arch bridge is analyzed. The results show that the structural stability coefficient decreases by 12% from 24.39 to 21.67 and the structure stability mainly depends on the dead load, considering the effect of live load. The lateral force generated by the camber of curved beam reduces the stability coefficient by 15.2%, which is one of the main factors leading to the external instability of composite bridge. The whole consolidation of arch foot is better than the partial consolidation stability, therefore the stronger the restraint ability of the arch foot, the better the structural stability performance. The change of transverse bending stiffness of arch ribs results in the most significant increment of stability coefficient, hence arch ribs transverse bending stiffness is the key factor in composite bridge structural stability.更多还原