津保铁路矮塔斜拉桥的动力特性

以津保铁路矮塔斜拉桥为例，应用大型有限元软件Midas／Civil对该桥建立全桥模型，采用子空间迭代法对其进行动力分析，得出该桥的自振频率和振型，并讨论了边界条件对其动力特性的影响．计算结果表明：设置辅助墩能明显提高结构的整体刚度，并对结构的自振频率和振型有较大影响．研究结果可为同类型矮塔斜拉桥的设计和施工提供参考．

Analysis of Dynamic Characteristics in Low-pylon Cable-stayed Bridge of Jinbao Railway

Natural frequencies and mode shapes are important parameters of the vibration characteristics of the structure parameters. This paper takes large finite element software Midas/Civil to create a full-bridge model for Jinbao Railway low-pylon cable-stayed bridge, and uses the subspace iteration method for dynamic analysis, then gets the result of bridge vibration frequencies and mode shapes, and discusses the impact of boundary conditions in its dynamic characteristics. The results show that： the auxiliary piers can significantly improve the overall stiffness of the structure, and the structure of the natural frequencies and mode shapes have a greater impact. The results can provide reference for the design and construction work of other similar low tower cable-stayed bridge.