Optimization design on the section of curved composite box beam bridges

A curved composite box girder bridge has a coupling effect of bending and torsion under external load. The existence of interface slip will reduce the stiffness of the curved box girder and generate additional deflection. Because the curved composite box girder has multiple junction surfaces, under the action of external load, the different junction surfaces present asymmetrical slip distribution, and the shear connector force is complicated, so it is difficult to obtain its analytical solution. In this paper, an analysis model of a curved steel-concrete composite box girder is established by selecting the appropriate element type and material constitutive relationship model. And by comparing the numerical simulation results with the experimental results, the correctness and rationality of the constitutive relationship between the element type and the material are verified. Based on the cross-section parameters obtained by numerical simulation and experimental verification, combined with nonlinear optimization theory, the relationship between the optimized parameters is analyzed, and the cross-section of the curved composite box girder is optimized. The research results can provide a theoretical basis for the optimal design of curved box girder bridges.