Analysis on distortion of thin-walled box girders considering deformation of diaphragms
To overcome the shortcomings of using rigid diaphragms in the distortion analysis of thin-walled box girders,an improved analytical method considering the influence of diaphragm deformation was proposed.Based on the compatibility relationship between the distortion deformation of the box girder cross section and that of the diaphragm itself,the constraint distortion moment provided by the diaphragm was solved,and a clear explanation of the physical meaning of the distortion moment was presented.Formulas for calculating the anti-distortion stiffness of plate-,X-,V-,and frame-shaped diaphragms were derived,respectively,and the influence of different diaphragms on the distortion effect of box girders was analyzed.The research results show that the distortion moment is two equal but opposite moments generated by the shear flow to any corner in the cross section of a box girder.Among the three types of diaphragms,the plate-shaped diaphragm has the highest anti-distortion stiffness,while the V-shaped diaphragm has the smallest.The generalized internal forces of box girders when arranging the plate-shaped diaphragm are close to the corresponding internal forces when arranging rigid diaphragm,but the distortion angle and the transverse bending moment are significantly differ-ent from those when arranging rigid diaphragm.Compared with the X-and V-shaped diaphragms,the plate-shaped diaphragms cause greater warping displacement within the span of box girders.
thin-walled box girderdistortionenergy variation methoddiaphragmanti-distortion stiffnessdistortion moment
万方数据
维普
