The Analysis Of Sub-internal Force In Skew Deep Girder

The skew girder bridges are applicated In highway more and more widely. The impact of sub-internal force is very obvious in this kind of structure, Sometimes even overtake the effect produced by the car load, so researchers and designers payed more and more attentions to it. As is known to all, The skew girder is generally used in small span bridge, considering the influence of shear deformation on internal force of the skew girder seems particularly important, There are few literatures on the internal forces of skew deep girder conducted in-depth study.In this paper, based on the principle of Timoshenko, The sub-internal force of single span skew deep girder(Including prestressed internal force 、 temperature internal force、displacement internal force) and continuous type A inclined deep girder(Including prestressed internal force、temperature internal force) are derived, Inspecting the regular of shear deformation and sub-internal force by changing the different slope of single span skew deep girder and continuous type A inclined deep girder; The calculation formula of sub-internal force of single span skew deep girder(Including prestressed internal force、temperature internal force) with considering the bearing vertical support stiffness and the end transverse beam bent stiffness is derived, inspecting the coupling effect of single span skew deep girder between shear deformation and support stiffness, getting the following conclusions:1、The impaction of sub-internal force caused by changing the skew angle in the single span skew deep girder and continuous type A inclined deep girder, which must be getted enough attention during the design of skew bridge.2、The impaction on sub-internal force caused by changing the vertical support stiffness in the single span skew deep girder, however, the end transverse beam bent stiffness on the sub-internal force can be ignored. In the actual project, the internal forces can be adjust ed by changing the the vertical support stiffness, so that tends to be uniformed over the entire bridge.3、The impaction on shear deformation is obvious by changing the skew angle, however, the support stiffness on shear deformation is very small, especially the vertical support stiffness, its impact can be basically negligible.4、The skew angle with type A continuous girder bridge internal force influence is significant. the span of 10 m type A continuous skew beam in this paper, the impact basiclly reaches more than 50%.