The thin-walled composite columns with an open cross-section reinforced by intermediate stiffener under axial compression have been considered. The finite element method is employed to study the buckling behaviour of the thin-walled composite column. Eigenvalue analyses are carried out first to predict the buckling load and buckling mode shapes of the column, and then the geometric nonlinear analyses are performed to investigate the nonlinear buckling properties and post-buckling behaviour of the thin-walled structures. The type of angle ply symmetric laminate is used. The investigation is performed over several values of ply arrangement angle and various values of stiffener parameter. The numerical results show a significant effect of the intermediate stiffeners and composite ply angle on loading capacity and buckling behaviour of the thin-walled composite column. The research provides insight into the thin-walled structure and composite laminate, which is employed to enhance the loading capacity of thin-walled composite structures.

中文翻译：

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在轴向压缩下具有中硬开口截面的薄壁组合柱的屈曲和后屈曲

已经考虑了在轴向压缩下由中间加强筋加固的具有开放横截面的薄壁复合材料柱。采用有限元方法研究了薄壁组合柱的屈曲行为。首先进行特征值分析以预测圆柱的屈曲载荷和屈曲模式形状，然后进行几何非线性分析，以研究薄壁结构的非线性屈曲特性和后屈曲行为。使用角帘布层对称层压体的类型。对帘布层布置角度的几个值和加劲肋参数的多个值进行研究。数值结果表明，中间加劲肋和复合层板夹角对薄壁复合材料柱的承载能力和屈曲性能有显着影响。该研究提供了对薄壁结构和复合层压板的洞察力，用于增强薄壁复合结构的承载能力。