In order to further study the mechanical behavior of the small and medium span and curve twin-I girder bridges composite with concrete deck, the numerical analysis combined with the existing test data was used to study on the ultimate bearing capacity of 35m standard span continuous composite beam in the supporting project. Based on ABAQUS nonlinear finite element numerical calculation model, using the experimental data in the literature, the numerical calculation model is verified from the aspects of failure load and mid-span deflection. The analysis and comparison of the ultimate bearing capacity of the full bridge structure of different bridge spans under construction and in finished bridge state were carried out. Finally, considering the factors of bending-torsional coupling of curved beam bridge, the above analysis method was used to study the mechanical performance of the full bridge under the unequal height of the inner and outer main girders, and the inner and outer steel beam heights were optimized separately. The most economical angle of steel was to estimate the reasonable beam height of the inner and outer steel beams, which can provide design reference for similar projects.

CICTP