Force Simulation Analysis of the Construction and Operation Stages of CFST Arch Bridges
In order to study the changes in displacement and stress state during the construction and operation stages of a CFST arch bridge,finite element software was used to perform simulation analysis on a concrete-filled steel tube arch bridge.The results show that:1)The stresses of the steel pipes and the concrete inside the pipes in each control section during the construction stage are all compressive stresses,which confirms that the arch bridge is mainly under compression;2)The removal of the buckle cables will cause the internal force of the arch ring to be redistributed,and the steel pipe stress will undergo a sudden change,but the amplitude of the change is not large;3)The stability coefficient of the bridge increases first,and then gradually decreases as the construction process progresses after the hinges are sealed,and the minimum value of the stability coefficient meets the specification requirements;4)The maximum displacement of the vault during the construction stage and the maximum displacement of the vault during the operation stage are close;5)The first 10 vibration modes are mainly dominated by out-of-plane transverse vibration and arch rib torsional vibration,with frequencies less than 0.6,indicating that the structure is flexible.The out-of-plane stiffness of the arch rib is smaller than the in-plane stiffness,and torsional vibration occurs more often,indicating that the torsional stiffness of the arch ribs is small,and the lateral connections of the arch ribs should be strengthened or the number of lateral connections should be increased during design.
NETL
NSTL
万方数据
