大跨度中承式钢管混凝土拱桥的动力特性分析

以某大跨度中承式钢管混凝土拱桥为例，采用有限元分析商业软件MIDAS建立了三维有限元模型对其桥跨结构的自振频率进行了计算和分析。得到了其前十阶自振模态，并计算分析了横撑布置形式和布置数量、拱肋截面尺寸对桥梁动力特性的影响，计算结果可为该桥的施工以及运营阶段的健康检测和维护提供参考。

The Analysis of Dynamic Characteristics of Long- span Half- through CFST Arch Bridges

The paper based on a long - span half - through CFST arch bridge for example, the three - dimensional space finite element model has been established by commercial software finite element program MIDAS for calculating the natural vibration frequency. The top 10 of vibration mode is analysed. The effect of the difference values of the style and number of cross supports collocation and the arch rib section size on the dynamic characteris- tics of the long - span half - through CFST arch bridge is discussed. The calculating results can offer the related technical parameters and basic data for the design certification, construction, health detection and maintenance inworking conditions.