非对称大跨度钢管混凝土拱桥非线性稳定性分析

Nonlinear Stability Analysis for Unsymmetric Large Span CFST Arch Bridge

探讨了钢管混凝土拱桥几何非线性和材料非线性稳定性分析方法,并运用通用有限元程序对某铁路大桥进行分析.结合该桥的特点,在稳定性分析中引入了钢管混凝土构件的轴压本构关系,以考虑材料非线性对稳定的影响.结果表明:几何非线性对该桥稳定性影响较小,而材料非线性对稳定性影响较大,这些结论对钢管混凝土稳定性分析具有指导意义.

The methods of geometrical nonlinearity and material nonlinearity analysis are discussed and common FEM software is used to analyze the stability of certain railway bridge. In this stability analysis, axle load constitutive relation of the CFST components are considered according to this bridge in order to take material nonlinearity＇s influence into account. The result shows that the material nonlinearity affects the stability much more than the geometrical nonlinearity＇s does.