Study Of Shear-lag And Distortion For Thin-Walled Curved Grider With Great Initial Curvature

This paper hypothesized a displacement pattern with consideration of bending, torsion, shear-lag and distortion, educed the flexibility governing differential equations and boundary conditions of thin-walled curves box girder by using functional energy-variational principle,and obtained the closed-form solutions of the equations. Then, used the homogeneous solution derived from the governing differential equations as the displacement patterns of finite segment, established a thin-walled curved box girder finite segment model with consideration of bending, torsion, shear-lag and distortion, and calculated the shear-lag and distortion stress of the curves box girder. The result are compared with the finite element method's,and goodly anastomosed.Used a Perspex glass model of a two-span continuous curved box girder to provide experimental results for verifying the accuracy of the present method. Finally, using present method, calculated three-span continuous curved box girders. Furthermore, it explored the influence on shear-lag with different initial curvature, curvature center angle and width-to-span ratio, reached some regular patterns and conclusions about the shear-lag of continuous curved box girders, and made an applicable calculation table. The conclusion of this paper is the development of the theory of shear-lag, would provid reference for engineering designing in the thin-walled curved box girder.