抗弯刚度比对加劲板屈曲性能的影响

Influence of flexural stiffness ratio on the buckling behavior of a stiffened plate

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.

With the consideration of 13 different stiffness ratios,different stiffener arrangements and boundary conditions,the linear buckling and non-linear buckling behaviors of a stiffened plate with large-scale thin-walled steel structure were investigated using a finite element method.It is found that the effect of flexural stiffness ratio on the buckling performance of the stiffened plate is significant.At the critical stiffness ratio,which is ranging from 10 to 20,the buckling modes of the stiffened plate are divided into two main types,overall buckling and local buckling.The non-linear buckling load increases with the flexural stiffness ratio of the stiffened plate increasing.The increment of stiffeners in the loading direction can increase the local buckling load of the stiffened plate;however the increase of stiffeners in the non-loading direction has little effect on the local buckling behavior of the stiffened plate.