The Study Of The Transverse Stress Distribution For The Beam Of Prestressed-concrete Cable-stayed Bridges

The study of the stress of the cable-stayed bridge is laid particularly on the shear lag effect, which is nonuniformity of the longitudinal stress distribution along the lateral way, but there is less research about the transverse stress distribution. The section width of the cable-stayed bridges is wider and wider, so the transverse effect is more salient. There are more work accidents due to ignoring the transverse effect. The paper did some research on the characteristics of the transverse stress for the box-section cable_stayed bridges.Based on the two cable-stayed bridges with double cable planes and single cable planes, paper exploited some study such as general transverse forces, prestressed reinforcement effect, the concrete shrinkage. The design methods of the transverse prestressed reinforcement was compared including grillage analogy, simple simulation method and the finite element method.For the structures of the cable-stayed bridges, the transverse effect the structure is notable on the dead load and transverse prestressed reinforcement. The simple simulation method can not analyze the transverse stress distribution correctly, so the finite element method is necessary to the bridge with large width. For the cable stayed bridge with consolidated system, shrinkage affect greatly, especially in the initial stage. If discrepancy of age is long, the transverse stress would be affected greatly.The usual way to design prestressed reinforcement is the simple simulation method. To the box-section structure with large width, the results between the simplesimulation method and the finite element method are different greatly. The paper exploited the grillage analogy method, and the results are close to the results of the finite element method.