大跨径钢管混凝土拱桥稳定性研究

钢管混凝土拱桥在我国得到广泛应用，稳定性问题是制约钢管混凝土拱桥发展的重要因素之一。结合工程实践，采用大型通用有限元分析程序MIDAS／Civil对拱桥稳定性进行了研究分析，对钢管混凝土拱桥拱肋钢管的截面厚度、拱肋内填混凝土强度以及横撑布置形式对拱桥稳定性的影响进行研究。研究表明，拱肋钢管的截面厚度对拱桥稳定性影响较大，“米”字横撑布置形式比较合理。研究内容对提高该桥所采用稳定性措施的经济合理性有一定的借鉴意义。

A Study of the Stability of Long-Span Concrete-Filled-Steel-Tube Arch Bridges

Concrete-filled-steel-tube arch bridges have found wide applications in our country,in which case the problem of stability is one of the important factors that restrict the development of concrete-filled steel tube arch bridges. With engineering practice as examples, the large-type universal finite element program MIDAS/Civil is used for the study and analysis of the stability of the arch bridge in the paper, with some of the factors influencing the stability of the arch bridge studied, which include the effects of the thickness of the rib tubes, the strength of the filled concrete, and the lay-out of the crossbars on the stability of the arch bridge. Our research shows that the thickness of the rib tubes has a great effect on the stability of the arch bridge and the lay-out form of ＂米＂ is comparatively rational. The research is of certain referential importance in improving the economic rationality of the stability-improving measures for the arch bridge.