本文仍按翼缘板纵向位移函数为4次抛物线变化规律来研究悬臂梁沿梁长按二次抛物线变截面的剪力滞效应。这里仍沿用差分方程来求解。最后将计算结果与等截面、直线变截面做对比与讨论。一、基本微分方程通过假定位移函数u_(x,v)=h_i[(?)_w/(?)_x+(1-y~4/b~4)u_(x)]的变化规律,按最小势能原理,最后得到微分 In this dissertation, the shear lag effect of the cantilever beam along the second-parabolic variable cross-section of the beam is still studied according to the 4th parabola variation law of the longitudinal displacement function of the flange plate. Here is still using the difference equation to solve. Finally, the calculation results are compared with the equal section and straight section. First, the basic differential equation by the hypothesis of the displacement law u_(x, v) = h_i[(?)_w/(?)_x+(1-y~4/b~4)u_(x)] Principle, finally get differential