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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。
Taking a large-span CFST basket-type arch bridge as the research object and combining with a large-scale general finite element program, three kinds of finite element calculation models of real bridge based on different assumptions were established. Subspace iteration method was used to calculate the bridge structure The natural frequencies and mode shapes of the three models were compared and analyzed. The structural parameters such as the internal stress, the steel ratio, the steel tube diameter, the concrete elastic modulus and the bracing arrangement were studied. Impact. The results of the analysis can provide a reference for the design of the dynamic design of such bridges.