STUDY ON SLAB TRANSVERSE MOMENT DISTRIBUTION
IN TWIN GIRDER CROSS-BEAM COMPOSITE BRIDGE
Da Xiang1*, Yuqing Liu1, Xiaoqing Xu2
1Department of Bridge Engineering, Tongji University, Shanghai, China
2College of Civil Engineering, Chongqing University, Chongqing, China
In twin girder cross-beam composite bridges, the structural characteristics of steel girders may have effect on the transverse moment distribution of concrete slabs. In this paper, finite element analysis of an actual composite bridge was conducted to study the transverse moment distribution of concrete slabs subjected to a linear uniform load. The impacts of the spacing of headed studs at the steel-concrete interface were also investigated. Then a frame model constrained by springs was introduced to explore the mechanism of the transverse moment distribution of concrete slabs. The results show that the transverse flexural stiffness of steel girders, mainly determined by the layout of crossbeams and the vertical stiffeners, is the major influencing factor on the moment distribution. The spacing of headed studs also slightly affects the moment distribution since the connectors could change the rotational constraints on slabs provided by steel girders. The comparison between FEA results and the frame model method proves that the proposed frame model could obtain accurate results for predicting the transverse moment distribution.
Steel-concrete composite bridge; Transverse moment distribution; Finite element analysis; Frame model