Research On Static And Dynamic Load Test Of CFST Arch Bridge

Bridge static and dynamic load test is an important testing method, which can provide advantageous and direct administrators to evaluate carrying capacity of bridge. Especially for the new bridge design theory and working techniques it can provide valid actual datum. Concrete-filled steel tubular (CFST) arch bridge is a new-type structure of bridge, which has been deeply developed in the past more than ten years. The study on design theories of CFST gets relatively behind the engineering practice. This paper carries on the systematic summary of the concrete-filled steel tube arch bridge's developing history, and makes a detailed instruction about the load test of this kind of bridge. On the basis of analysis of the Caihong Bridge in Shaanxi province, the following aspects are investigated:CFST numerical modeling was establishment through Using finite element analysis software ANSYS, according to bridge structure characteristic and under endogenic force computation determination dead load experiment load operating mode, various operating modes load and unloading process and magnitude, as well as in master control section and section measuring point build. Through the dead load experiment, the determination bridge controls the strain and the amount of deflection value under the experimental load function which in the section determines, carries on the analysis with the model computation theoretical value, had determined bridge actual bearing capacity satisfies the request.Caihong Bridge has carried on the theory modality analysis using the finite element model, which can calculate this bridge theory base frequency resonance oscillation. The analysis obtains this bridge in the surface the rigidity to be bigger than outside the surface the rigidity, conforms to the steel pipe concrete arched bridge to inspire the rule. The moving load experiment respectively carries on the excitation by the race car or the braking form to the bridge, obtains the entire bridge the vibration frequency and the damping ratio, the actual result indicated this bridge has the good power performance.