剪切载荷下肋板的屈曲分析与优化

BUCKLING ANALYSIS AND OPTIMIZATION OF STIFFENED PLATES SUBJECTED TO SHEAR LOADING

利用ANSYS有限元方法分析了一系列的肋板,研究了加强肋的作用,提出了优化肋设计的限制条件.结果表明,由横向肋板产生的栅格数目不能小于肋板的长宽比.换句话说,横向加强肋必须把平板的长度划分为小于等于宽度的段.结果还显示,加强肋的优化几何特性与板的屈曲从整体模态到局部模态转变点相应.而且,所有具有相似长宽比和肋数的肋板,具有一个特定的比值EI_s/aD,此时抗剪应力最佳.

By using ANSYS finite element software, a series of plates are analyzed in order to study the role of stiffeners and to propose some limit conditions for an optimized design. The results show that the number of panels produced by intermediate transverse stiffeners should not be less than the value of plate＇s aspect ratio. In other words, the transverse stiffeners should divide the length of the plate to portions with length equal or less than its width. It is also shown that the optimum geometric properties of the stiffeners are related to the point when the buckling shape of a plate changes from the overall mode to a local mode. Furthermore, all stiffened plates, with a similar aspect ratio and number of stiffeners, have a specific value of Els/aD, for which the critical shear stress is optimal.