Research on the Modal Experiment of Large-span Cable-stayed Bridge with Steel Concrete Composite Girder During Cantilever Assembling and Finished Stage

The vibration characteristic parameter of large-span cable-stayed bridge with steel concrete composite girder during cantilever assembling and finished stage (vibration frequency, vibration mode and damping ratio) is one of the determinants of the dynamic performance of the bridge and also a representation of the overall state of the structure. The structural system problems, wind resistance and seismic performance of cable-stayed bridge are closely related to the dynamic characteristics of the bridge structure. This paper uses Midas Civil structure analysis software to establish the three-dimensional finite element model of steel box girder cable-stayed bridge of Qihe Yellow River bridge. Dynamic characteristics are analyzed in the construction stage and finished bridge stage. The finite element analysis results are compared with bridge modal experiment results, which provides a reference for the same type of bridge design and construction.