Abstract:The steel-concrete composite beam has the advantages of steel structure and concrete, good economy, easy construction, and is widely used in engineering. For the composite beams with multiple longitudinal beams, the relationship between bridge deck and steel structure can be divided into the large crossbeam system and the small crossbeam system. To study the force characteristics of bridge decks with different systems under live load, based on the Shenzhen and Shantou Cooperation Zone Tonggang Avenue Project, the bridge deck construction and design details of three systems such as large crossbeam without steel cantilever, large crossbeam with steel cantilever and small crossbeam for the double-narrow-box composite beam structure are analyzed. And the finite element analysis model of bridge deck structure with three systems is established by MIDAS FEA NX to compare the force of the bridge deck when the vehicle load is located in different areas of the bridge, and the influence of longitudinal beam clear distance and crossbeam interval on the force of the bridge deck. The results verifies that the large crossbeam system can improve the force of bridge deck. The optimal spacing ratio between longitudinal beam and crossbeam, and the maximum boundary distance of the bridge deck are obtained, which provides a useful reference for the subsequent construction of similar projects.
