Study On Mechanics Effect Of Simplesupport Box Girder Used In High-Speed Passenger Railway

Because of its beautiful external shape, good mechanical performance and structural functions,the box girders have been widely used in simple-supported beam, continuous beam, continuous rigid frame,cable-stayed bridge . Especially in the rapid development of the railway times, the application of prestressed concrete box girder becomes more and more widely. However, the force of box girder is complicated and results in spatial effect, especially the asymmetry structure shows the asymmetry obviously.Based on the example of 32m prestressed concrete box girder, this thesis studies the box girder longitudinal stress, shear lag and the unequalizing support effect by using the space finite element method and the finite software MIDAS to set up the solid element. At the same time, the longitudinal stress and the deflection of box girder in a variety load are calculated, and then are compared with the MIDAS calculated data. At last we get the following conclusions: solid element is proved feasible by using MIDAS; the longitudinal stress regulation of box girder and the location -limited data are also obtained. All of these are very useful for the future design.