【摘要】 简要介绍了钢管混凝土拱桥稳定性分析的2种方法:线性屈曲和非线性弹塑性屈曲.以益阳茅草街钢管混凝土拱桥为例,建立了有限元分析模型,采用大型通用有限元分析程序ANSYS对其成桥稳定性进行了分析,并进一步探讨了结构的几何非线性、材料非线性和初始缺陷对该桥稳定性的影响.分析表明,接近失稳荷载时,拱顶已出现较大竖向位移,应考虑大位移对稳定性的影响;结构的初始缺陷和材料的塑性都使得结构的稳定性降低.更多还原

【Abstract】 The two methods, the linear and nonlinear bucking analyses, to determine the critical load of a longspan arch bridge of concretefilled steel tubes were presented. A 3D FE model of Maocaojie arch bridge in Hunan, as an example, was set up, and its stability was analyzed using finite element program ANSYS. The effects of geometry nonlinearity, material nonlinearity and initial defects of the structure on the stability of this arch bridge were investigated. The results show that large displacement occurs at arch top when loading reaches to the load of stability loss, so the effect of large displacement should be considered in the analysis of stability; and the material nonlinearity and initial defects of the structure make its stability decrease.更多还原