Abstract
In this paper, the finite element software Ansys is used to establish the model of Fenghua River super large bridge and to analyze its natural vibration characteristics. Without being considered the effect of pile-soil, the stiffness of different parts of the bridge structure is constantly changed to study the factors of influencing "Fly-bird-type" concrete filled steel tube arch bridge. The calculation results show that the arch rib stiffness, the wind bracing stiffness, the suspender stiffness and the main beam stiffness can improve the stability of the bridge structure, and also make the natural frequency increase.
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