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研究了评估各向同性和各向异性加劲板的局部屈曲和屈曲后性能的方法。该方法考虑了2个加劲肋之间的加劲板块,用等效的各种不同刚度横向和转动弹簧代替其余的板块,作为所计算板块的弹性支座。在解决各向同性和具有任意边界条件的碾压对称组合板的局部屈曲问题时,采用二维里兹位移函数(pb-2Ritz)。通过板块的屈曲分析能准确地预测板的局部屈曲性能。最后,将此方法加以改进,用于预测表面已经局部屈曲的加劲板的屈曲后反应。选择适当的边界条件对所分析的构件在屈曲后性能的计算中是非常重要的。该方法计算的结果与相应的有限元结果符合较好。
A method to evaluate the local buckling and post-buckling performance of isotropic and anisotropic stiffened plates was studied. The method takes into account the stiffening plate between the two stiffeners and replaces the remaining plate with the equivalent transverse and rotational springs of different stiffness as the elastic support for the calculated plate. The two-dimensional Litz displacement function (pb-2Ritz) is used to solve the local buckling problem of isotropic and laminated composite plates with arbitrary boundary conditions. The buckling analysis of plates can accurately predict the local buckling performance of the plate. Finally, this method is improved to predict the buckling reaction of stiffened plates with locally buckled surfaces. Choosing the appropriate boundary conditions is of great importance in the calculation of the post-buckling performance of the member to be analyzed. The calculated results of this method are in good agreement with the corresponding finite element results.