This paper describes the experimental and theoretical investigation on ultimate strength of cold-formed steel built-up square stub columns under axial compression. In total, fifteen stub columns were tested by varying the cross-sectional dimensions of specimens. Local buckling, distortion, and interaction of these buckling modes were observed. The strengths obtained from the experiment are compared to the design strengths calculated using the effective width method, which is a direct strength method in the North American Specification for cold-formed steel structures. It was observed that the effective width method conservatively predicted the strength of specimens. The reliability analysis was carried out to evaluate the appropriateness of the design standards.

中文翻译：

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带中间加劲肋的冷弯型钢组合式方管的短管柱测试

本文描述了在轴向压缩下冷弯型钢组合方钢管短柱的极限强度的试验和理论研究。通过改变样品的横截面尺寸，总共测试了十五根短柱。观察到了局部屈曲，变形以及这些屈曲模式的相互作用。将实验获得的强度与使用有效宽度法计算的设计强度进行比较，有效宽度法是北美冷弯钢结构规范中的直接强度法。据观察，有效宽度法保守地预测了样品的强度。进行可靠性分析以评估设计标准的适当性。