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以一大型薄壁钢结构的加劲板为研究对象,采用有限元方法,考虑了13种不同的刚度比、多种不同的加劲肋布置方式以及边界条件等因素,分析了加劲板线性屈曲和非线性屈曲性能.抗弯刚度比对加劲板的屈曲性能影响显著,加劲板最佳抗弯刚度比将其线性屈曲模态划分为整体屈曲和局部屈曲,其值为10～20.加劲板非线性屈曲荷载随抗弯刚度比增大而提高.另外,在加载方向增加加劲肋布置可以提高加劲板局部屈曲荷载,在非加载方向增加加劲肋布置对加劲板的局部屈曲性能影响较小.
Taking a large thin-walled steel stiffener as the research object, finite element method, 13 different stiffness ratios, different types of stiffener arrangement and boundary conditions were considered. The linear buckling and nonlinear buckling of stiffener were analyzed. The flexural stiffness ratio of the stiffened plate has a significant effect on the buckling performance, and the optimal flexural stiffness ratio of the stiffened plate divides the linear buckling mode into integral buckling and local buckling with the value of 10 ~ 20. Which increases with the increasing of the bending stiffness ratio.Additionally, increasing the stiffener placement in the loading direction can improve the local buckling load of the stiffened plate, while adding the stiffener arrangement in the unloaded direction has less influence on the local buckling performance of the stiffened plate.