Shear Stress Calculation Method of Box Girder with Variable Section Based on Prestress Diffusion
Based on the traditional calculation method of shear stress of box girder with variable cross section,the concept of prestress diffusion was put forward by considering the additional shear stress caused by the change of axial force.By introducing the prestress diffusion function and solving it by u-sing the wedge elastic body theory,the calculation method of shear stress of variable cross-section box girder based on prestress diffusion was established.Taking the mid-span cantilever casting section of a super-large bridge as an example,the comparison between the traditional calculation method and the calculation method in this paper shows that the change of axial force has great influence on the shear stress near the root,but little influence near the free end of the cantilever.In the construction stage,the traditional calculation method will greatly underestimate the shear stress and principal tensile stress in the section,so the influence of axial force change on shear stress cannot be ignored.
shear stressprestress diffusionbeam with variable sectionchange of axial force
万方数据
维普
