【摘要】 以某大跨径钢管混凝土提篮式拱桥为研究对象,结合大型通用有限元程序,建立了3种基于不同假定的实桥空间有限元计算模型,利用子空间(Subspace)迭代法计算了该桥结构的自振频率和振型,并对3种模型的计算结果进行了对比分析;研究了拱肋内倾角、含钢率、钢管直径、混凝土弹性模量、横撑布置等结构参数对结构动力特性的影响。分析结果可为该类桥的动力设计提供参考依据。更多还原

【Abstract】 A long-span concrete-filled steel tube X-type arch bridge is taken as the studying basis.The bridge space finite element calculation model is built based on three different kinds of assumptions combining with large-scale finite element method procedure,the natural vibration frequencies and modes of the bridge are calculated with the subspace method,and the comparative analysis of computed results from the three kinds of models are carried out.The impacts of structure parameters,such as leaning angle,the ratio of concrete and steel,steel tube diameter,concrete elasticity modulus and cross-brace,on structure dynamic characteristic property are studied for the dynamic design of this bridge.更多还原