Analysis Of Static Performance In Skew Continuous Girder Bridge Transformed From Simple Supported System

As development of the internal high-class road and city communication. Application of skew girder bridge improving in the design of city line in the last few years. In another hand, because of the convenient construction, low cost and short construction period, the method, which transforming from simple supported system into continuous system, is one of the main types in construction of small-medium span bridge and approach of large span bridge. But it is great different in mechanical performance of right and skew bridge. Concerning the method for transforming from simple supported system into continuous system, the theory is not mature. And it has not formed a uniform standard in reinforcing steel setting for cast-in-site connecting section, cast-in-site method, cast-in-site order, setting for prestressed steel of negative bending moment and tension order. This dissertation analyses mechanics behaviors of box-girder skew bridge and researches to find the optimal setting for cast-in-site connecting section.Internal force and deformation in single-span skew girder and continuous skew girder are analyzed from theory. Skew girder bridge is simulated numerically and calculated with grillage theory. In this dissertation, the bridge model is built with bridge professional program Midas Civil to analyse the effect and rule of skew angle and ratio of bending-torsion stiffness to the internal force and reacting force in skew girder bridge. Reference to some a actual skew bridge, which was transformed from simple supported system into continuous structure, the constructing courses is simulated to analyse stress changement before and after system transformation. And some conditions, such as different constructing procedure, setting and length for prestressed steel of negative bending moment, are simulated and calculated and analysed. Some suggestions about optimization are given as well.