Dynamic Characteristics and Sensitive Parameters Analysis of Concrete-Filled Steel Tube X-Type Arch Bridge

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.