A steel arch bridge is a beam-arch composite system structure, which is constructed by overall incremental launching. During the construction process, the stress changes of the structure are complex, and the local stress safety problem of steel box girder is prominent when the reaction force of fulcrum is large. In this paper, based on the overall incremental launching construction of the beam-arch composite arch bridge, the whole simulation model was set up by the software Midas Civil with “beam remain still and only lower supports reverse move” method. On this basis, the local stability and strength of the main longitudinal beam under the most disadvantage working conditions are analyzed by finite element software ABAQUS, the calculation results show that the local stability of the steel box girder in the process of pushing can meet the requirements of the code, and the structural stress is large, but it can ensure the construction safety; The measuring points of the critical sections were chosed under the stress simulation results, and then the stress had been monitored in overall incremental launching construction, and the varing laws of the stress was analyzed detailedly according to the monitored results. The results of this paper can be benefit for the similar projects in the future.

CICTP