中文摘要：

外倾式拱梁组合桥梁是一种新颖的桥梁形式,然而其外倾式拱肋的稳定性问题十分突出。以一座实桥为背景建立空间有限元模型,并以现有的拱桥稳定性分析理论为指导,对该桥在成桥状态下和吊杆张拉施工过程中的结构稳定性进行分析,通过对比分析得出:该桥的失稳模态主要表现为拱肋面外失稳;几何非线性和材料非线性对该桥的稳定性有显著影响;采用内、外吊杆交替张拉的方式可显著提高张拉过程中的结构稳定性;外吊杆对该桥的稳定性影响显著,采用空间多索面体系有利于提高该桥的稳定性。另外,通过大量计算揭示拱肋矢跨比、外倾角及截面刚度等参数对该桥稳定性的影响,并从中得到一些有益的结论,可供同类工程参考。

英文摘要：

The external slanted arch-beam combination bridge is a new type of bridge,and the stability prob-lem of its external slanted arch is significant.This paper took the Aixi Lake Bridge located in Nanchang city as the real-world engineering project and established the spatial finite element model of the bridge accordingly.In combination with the existing stability analysis theories for arch bridges,the stability of the Aixi Lake Bridge was analyzed with the process of suspenders tension and the completed bridge state taken into account.The analysis results indicate that the bucking mode of the bridge is mainly shown by out-plane bucking of the arch rib,and that the influence of geometrical nonlinearity and material nonlinearity on the stability of the bridge is significant. Adopting the pattern of tensioning inner-suspenders and outer-suspenders sequentially can improve the stabili-ty level of the bridge during the process of suspender tension.The outer-suspenders have positive impacts on the stability of the bridge;therefore,adopting the form of spatial multi suspenders system can improve the stabili-ty level significantly.Furthermore,through a number of calculations and analyses,the effects of geometrical pa-rameters of arch rib,such as the ratio of height to span,camber angle and section rigidity,on the stability of the bridge are revealed with several insightful conclusions drawn.The findings in this paper can provide useful refer-ence and guidance for similar projects.