Research On Complete Test Of Steel Tubular Tied Rigid Bar Arch Bridge

In recent years, our country economy stability increases and the scientific technology develops quickly, more investment is put into the fundamental facilities, we accomplish a lot of great construction of bridges and a large improvement also be made in bridge construction technology. With the high capacity, strong spanning ability, good seismic behavior and convenience of construction, Concrete-filled steel tubular (CFST) arch bridge develops rapidly and is a quickest-developing structure of bridge, which was built since 1990. To ensure bridges serving normally and test bridges structure parameter, static and dynamic load test are requisite for a new bridge, at the same time, the test can check if its reaction answer for the design Codes.In this paper, according to the requirements for bridge load test, the detail dead and dynamic load test program was drawn for a 120m length CFST arch bridge. Stresses and strains of some key locations and forces of the tie bars are collected under static load. The dynamic stresses and strains of the deck and CFST arch were sampling for various speed, truck jump and brake load. Some impact coefficients for various load conditions and intrinsical frequency and damp ratio are analyzed.To compare with test data, the FEM model of the bridge was built with beam and cable element and static analysis was carried out in term of the load cases in the test program.The results suggested that transverse stiffness of the bridge is well, the bridge structure is in elasticity under test loads, the intrinsical frequency is greater and damp ratio is less, there are different impact coefficients for various dynamic load cases, and the process building bridge FEM model is feasible. So the result in this paper can use for reference for same type engineering bridge structure design codes and load test codes...