Finite element calculation method for the cantilever push process of large span FRP-metal composite truss emergency bridges

Aiming at the problem that the traditional finite element calculation method cannot accurately reflect the deformation and internal force state of the large-span FRP-metal combined truss emergency bridge during the cantilever pushing process, the paper firstly introduces the structural form of the large-span FRP-metal combined truss emergency bridge itself and the guide beam, as well as the erection process of cantilever pushing, and then establishes the traditional finite element model and the improved finite element model to simulate the real bridge during the cantilever pushing process, and makes a comparative analysis of the results obtained by using the two finite element models. The results obtained by the two finite element models are compared and analyzed, and it is found that there is a big difference between the calculation results of the banked condition; finally, through the scaled model experiment, it is verified that the improved finite element model can more accurately simulate the deformation and the internal force state of the real bridge in the process of pushing and it is suggested to simulate the process of the cantilever pushover and erection of the large-span FRP-metal composite truss bridge by using the improved finite element model in the subsequent detailed design. It is recommended to use the improved finite element model to simulate the process of pushover erection of large span FRP-metal truss emergency bridge in the subsequent detailed design.