Abstract: Taking Yachihe bridge as the engineering background，the stability performance about the large span concrete filled steel tubular arch bridge under the material and geometrically dual nonlinear condition was studied． The stability safety factors and displacement condition of apex of arch were compared and analyzed，considering geometric nonlinearity and double nonlinear respectively． And the influence factors，such as the cross arm and skew angle，on the stability of the bridge were also analyzed． The results indicate that the safety factor of the stability in the double nonlinear stability of bridge has a certain decline，compared with that in elastic state． So the double nonlinear effect on the bridge stability can’t be ignored in actual engineering． And there is little sense to separately consider the geometric nonlinear．

Key words: concrete-filled steel tubular arch bridge, double non-linear, stability analysis, influence factors of stability

摘要： 以鸭池河桥为工程背景，研究了大跨度钢管混凝土拱桥在材料和几何双重非线性下的稳定性能，对比分析了 单独考虑几何非线性和考虑双重非线性两种情况下桥梁的稳定安全系数和拱顶位移情况，并分析了横撑、拱脚角等 因素对于桥梁稳定的影响。结果表明:双重非线性稳定下桥梁的稳定性的安全系数与弹性状态下相比有着一定的 下降，在实际分析的时候不能忽略双重非线性对于桥梁稳定的影响的结论;单独考虑几何非线性意义不大。

关键词: 钢管混凝土拱桥, 双重非线性, 稳定性分析, 稳定性影响因素