In order to explore the influence of combined effects of shear lag and shear deformation
on the bending deformation and stress of thin-walled box girders, the energy
variational principle and Timoshenko beam theory are applied to establish governing
differential equations. Deflection curve equation, bending stress expressions and
calculation formulas for shear lag coefficients are given respectively. With an increase
in
,
the deflection of the box girder decreases instead. It is recommended that
when
analyzing the bending deformation and stress of simply supported thin-walled box
girders. The smaller the span-width ratio, the more obvious shear lag effect. Shear lag
effect is more significant under the concentrated load. Compared with the shear lag
effect, the influence of shear deformation on the bending deformation of box girders is
more prominent. The investigation results provide a simple and effective analytical
calculation method for solving the bending problems of thin-walled box
girders.
