Analysis on distortion effect of thin-walled box girders approximately considering shear deformation
In order to study the influence of shear deformation on the distortion of thin-walled box girders,the shear force was considered in calculating the strain energy of a frame in analyzing distortion effect by applying a traditional energy variation method.The governed differential equation considering the shear deformation was established by applying the principle of minimum potential energy,and the initial parametric solution expressed in the form of a Krylov function was derived for box girders subjected to a uniformly distributed distortion moment load.A numerical example was given to analyze the influence of shear deformation on the distortion warping stress and the transverse bending moment,and verified by finite element software ANSYS.The results show that the distortion warping stress calculated by the proposed method is closer to the shell element solution of ANSYS than that by neglecting the shear deformation.After considering the shear deformation effect,the distortion warping stress increases by less than 1.85％,and the transverse bending moment increases by less than 2.35％.The height to span ratio of the thin-walled box girder has a significant effect on the distortion warping stress.
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