单肋钢管混凝土拱桥稳定分析

STABILITY ANALYSIS OF SINGLE CONCRETE-FILLED STEEL TUBULAR ARCH BRIDGE

介绍了钢管混凝土拱桥稳定性分析的两种理论:线性屈曲和非线性屈曲。采用大型通用有限元分析程序ANSYS对某单肋钢管混凝土人行拱桥成桥稳定性进行了分析,探讨了拱桥矢跨比、径厚比的变化对该桥稳定性的影响。结果显示,在考虑了双重非线性的影响后,钢管混凝土拱桥矢跨比宜选在1/4~1/5,而加大管径比加大壁厚对结构的安全稳定设计更加有效。

Two theories of the stability analysis of concrete-filled steel tubular arch bridges are introduced.One is the linear stability analysis,the other is the nonlinear stability analysis.Using the software of ANSYS,the stability of a single concrete-filled steel tubular arch bridge is analyzed.The influences of the rise-span ratio and diameter-thickness ratio on the stability of this bridge are discussed.The results show that the rise-span ratio of concrete-filled steel tubular arch bridge should be about 1/4~1/5 when the double nonlinearities are considered,and the larger tube is better for the stability than the thicker tube.