Dual-angle cross combined section columns (starred angles) have been extensively utilised as transmission tower legs because of their large bearing capacity. However, combined members may fail in different modes, and the provisions on bearing capacity in the regulations of different countries are diverse. To overcome the limitations of existing research and design approaches, a three-dimensional finite element (FE) model is developed in this study and is validated against all column test data available in the literature. Using this model, parametric analyses are performed on varying grades of steel, patterns of filler plates, and the number of filler plates, and the effect of the number and pattern of filler plates is determined. The shortcomings of the current design methods are highlighted along with the necessary solutions, based on a comparison of the results of experiments and those of numerical analysis using values calculated as per various regulatory codes. It is demonstrated that the type and the number of filler plates only affect the starred angles with flexural buckling about the imagine axis, and that torsional buckling and local buckling in the combined section columns do not occur simultaneously. When considering the influence of local buckling on the reduction in the bearing capacity of members, repeatedly factoring in torsional buckling is unnecessary. Furthermore, through modification of the slenderness ratio of the sub-members in the calculation of the equivalent slenderness ratio of starred angles, the calculation results obtained using the code agree well with the results of the numerical analysis.

双角截面组合截面柱（星形）由于其大的承载能力而被广泛用作输电塔的支腿。但是，合并成员可能会以不同的方式失败，并且不同国家的法规中有关承载力的规定也多种多样。为了克服现有研究和设计方法的局限性，本研究开发了三维有限元（FE）模型，并针对文献中所有可用的柱测试数据进行了验证。使用该模型，可以对不同等级的钢，填充板的样式和填充板的数量进行参数分析，并确定填充板的数量和图案的影响。强调了当前设计方法的缺点以及必要的解决方案，基于对实验结果和数值分析结果的比较，这些结果使用的是根据各种法规编写的值。结果表明，填充板的类型和数量仅影响围绕假想轴弯曲弯曲的星形角，并且组合截面柱中的扭转屈曲和局部屈曲不会同时发生。当考虑局部屈曲对构件承载力降低的影响时，无需反复考虑扭转屈曲。此外，通过在计算星形角等效长细比时修改子构件的长细比，使用该代码获得的计算结果与数值分析的结果非常吻合。