变截面悬臂箱梁剪滞效应分析

Shear Lag Analysis of Cantilever Box Girder with Varying Depth

首先利用能量变分法推导出等截面箱梁剪力滞效应微分方程及边界条件 ,对于变截面而言 ,该微分方程和边界条件的系数均是坐标的函数。采用差分法来离散并求解变截面箱梁剪滞效应微分方程 ,结合算例验证该方法的可靠性 ,针对不同荷载作用形式分析了变截面箱梁剪力滞效应规律。

Differential equations and boundary conditions(BC)are deduced according to energy-differential method about constant depth box girders.As for varying depth box girders,the coefficients of the differential equations and BC are the function of coordinates.Difference method is adopted to discrete and solve this differential equations about shear lag of varying depth box girders.An example is given to illustrate the method accuracy and reliability.The rule of shear lag is illustrated by this method under different loads.