Restrained Torsional Stress of Simply Supported Thin-walled Single Cell Box Girder under Concentrated Torque Load
In order to study the influence of cross-sectional parameters of simply supported thin-walled single-chamber box girder on torsional stress,taking a single-chamber box girder as an example,practical formulas for calculating torsional geometric properties such as torsional center,generalized main fan coordinates and main fan static moment are derived.The buckling normal stress and shear stress of a simple supported box girder are calculated by using the analytical method and ANSYS solid element.The effects of the width of cantilever plate and the height of chamber on the general static moment of fan,secondary shear stress and shear stress coefficient are also studied.The results show that the warping stress calculated by the method in this paper is in good agreement with the ANSYS simulation results.When the ratio of the width of the cantilever plate to the width of the bottom plate is 0.3,the role of the web bearing shear force can be fully exerted.With the increase of the ratio of the width of the cantilever plate to the width of the roof and the ratio of the height to width of the chamber,the generalized fanning static moment at the midpoint of the roof and bottom plate shows completely different change laws.
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