The Analysis Of The Difference Between The Single Girder And The Multi-girder Of The Cast-in-situ Box Girder

Recently, with the rapid development of high way in China, interchange on the highway also can be seen everywhere, but due to the limitation of the radius of the level curves of interchange ramp bridge of interchange ramp, most of the bridge on the ramp only can be designed to cast-in-situ box girder. And designers in the analysis of the superstructure of the bridge often replacing curve by straight line. With a straight bridge model instead of curved bridge model, thus they can reducing the difficulty and workload greatly.The author takes the cast-in-situ box girder as the basis, and establish the single beam model, the straight beamgrillage model, the bending beamgrillage model of the same span, the same size with finite element software, and configure the same prestressed steel beam and the same steel. Then compare the force of support,the internal force and deformation in the middle, and the internal force and deformation in the support under the moving load, the effect of temperature, the worst load combination. And compare the results of the PSC checking calculation, then sum up the experience from it, so we can get the difference between linear model and curve model, single beam model and grillage method model, and generalize from it, providing reference to designers in thedesign of oblique and curved bridge for future...