计算力学学报2012，Vol.29Issue(4)：625-630,6.
剪力滞效应对箱形梁挠度影响的研究
Influence of shear lag effect on deflection of box girder
摘要
Abstract
The warping displacement function for shear lag of twin-cell box girder is chosen upon the axial equilibrium of the relevant warping stress. Through defining the moment and product of inertia corre- sponding to the shear lag warping, the governing differential equations for shear lag analysis of thin- walled box girder are established by applying the energy variation method. The deflection formulas for simply supported and cantilever box girders under concentrated and uniform loads respectively and the fi- nite segment element stiffness matrix are derived through solving the governing differential equations. Model test and ANSYS shell element results validate the formulas derived. The increase of deflection due to shear lag effect of simply supported, cantilever, and continuous box girders is numerically studied. It is shown that, the increase of deflection for simply supported box girder due to shear lag is remarkable un- der both concentrated and uniform loads. The increase of deflection for continuous box girder can reach 14 % under concentrated loads. For a simply supported box girder with span-width ratio 4.0-6.0, the mid-span deflection calculated by elementary beam theory can be multiplied by 1.05- 1. 11. The influ- ence of shear lag effect on the deflection of cantilever box girder can be generally ignored.关键词
薄壁箱梁/剪力滞效应/能量变分法/挠度/双室箱粱Key words
thin-walled box girder/shear lag effect/energy variation method/deflection/twin-cell box girder分类
交通工程引用本文复制引用
张元海,林丽霞,刘勇..剪力滞效应对箱形梁挠度影响的研究[J].计算力学学报,2012,29(4):625-630,6.基金项目
国家自然科学基金 （）
长江学者和创新团队发展计划（IRT1139）资助项目. （）
