摘要
以一个工程实例———江西吉安赣江钢管混凝土拱桥为研究对象,建立了有限元模型,分析了竖向保向力和非保向力对该桥稳定性影响,考虑了双重非线性(几何非线性和材料非线性)对桥的稳定性的影响。结果表明:竖向保向力和非保向力对桥的稳定性都会产生不同程度的影响。考虑非保向力后桥的稳定安全系数较大,非线性对该桥稳定性的影响不可忽视。
Concrete-filled steel tube arch bridges have recently been developed quickly in China. However, the relative theory, especially the theory of stability, lags behind the practices. In this paper, the two methods for stability analysis： the linear and nonlinear buckling analysis, have been introduced first. Then according to a practical example-Jiangxi Ji＇an Ganjiang Concrete-filled Steel Tubular Arch Bridge, some aspects about stability have been discussed. This paper focuses on the influence of nonlinearity （ geometrical nonlinearity and material nonlinearity）, vertical conservative loadings and non-orientedly conservative loadings on the stability of this long-span arch bridge under dead load. The results show that the vertical conservative loadings and the non-orientedly conservative loadings also affect the stability of the models and the coefficient of stability of structure is larger under non-orientedly conservative loadings. In addition, the nonlinearity has greatly influence on the stability of the bridge, so it can not be neglected in the design.
出处
《长沙交通学院学报》
2006年第4期6-10,共5页
Journal of Changsha Communications University
基金
国家自然科学基金资助项目(8053021)
关键词
钢管混凝土拱桥
稳定性
保向力
concrete filled steel tube arch bridge
stability
conservative loadings
