Force Characteristic Analysis And Experimental Investigation On CFST Arch Bridge

The CFST arch bridge is taken as the subject investigated in this paper. With the planar finite element program-GQJS and the great general spatial finite element program-ANSYS, the linear elastic static and dynamic analysis of the CFST arch bridge is done, based on which, the static and dynamic experimental investigation is also done. For the CFST arch bridge, the stability problem is more prominent. The stability and the ultimate bearing capacity of the CFST arch bridge are studied in the paper. In the stability analysis, both the eigenvalue stability problem and the nonlinear stability problem are analyzed. The influence of the arch rib's material on the ultimate bearing capacity is also analyzed. Indicated by the theory analysis and the experimental investigation, when the CFST structure is calculated by the simplification method, the calculation accuracy using the transformed section method is higher than using the uniform modulus .method. According to the true section, the spatial model of the CFST arch bridge is established. This method is simple and feasible, and the calculation result is more close to the values obtained by testing the true structure. The force of the boom's cable of the CFST arch bridge is indirectly measured by adopting vibration-frequency method, because the boom of the CFST arch bridge is short relatively, the influence of the flexural rigidity and the boundary condition should be taken into account in the calculation. The wind brace and the double non-linearity affect greatly on the CFST arch bridge's stability, while the influence of the X brace near the arch springing and the geometrical non-linearity-on the CFST arch bridge's stability is little relatively. If the arch rib of the arch bridge uses the CFST material, the ultimate bearing capacity is high, and the economical efficiency and the ductility is good.