The Analysis And Research Of The Transverse Stress Of The Big Span Cable-stayed Bridge Deck Slab

The cable-stayed bridge,a kind of indeterminate flexible structure with many redundant degrees,consists of three basic members: towers, cables and girders. The cables bear the axial rally ,The towers and girders bear the axial pressure and flexure stress. When the development of the cable-stayed bridge from the sparse cable to dense cable,and with the increasing of the span of cable-stayed bridges,the wider of the bridge deck slab ,the higher of the main girder,the thickness of the bridge deck slab decreasethes, the problem of the transverse stress of the bridge deck slab will become more prominent.Based on the background of Fengjie Yangtze River Bridge, it first Calculates the internal forces of the girders in the paper, considering the material nonlinearity; Then selects the entity finite model from the whole, calculate the variety of transverse stress of the bridge deck slab at different model and different boundary conditions. The crossing clapboard of the Beam-and-slab composite girder is an important parameter affecting the transverse stress of the bridge deck slab. In this paper , compared the stress at constructing state and loading state at different distance, different hight, different thickness of the crossing clapboard. According the comparing, come to the conclusion that when analyzing the transverse stress of the bridge deck slab which model and boundary conditions we should take can content the precision dimand, and provid practical reference for design, construction and scientific research of long-span cable-stayed bridges.