This study investigated the compressive strength of slender C-shaped cold-formed steel members with web openings. The effective sectional area concept was adopted to conduct the analysis of cold-formed compressive members. The load-carrying capacity of compression member was calculated based on the sectional effective width as described in the AISI Standard. The study tested a total of 21 channel specimens including C-shaped cross-sections with and without web openings. Comparisons were made between the test results and the predictions based on both the AISI Standard and the ANSYS analysis. The results indicated that all the observed failure modes were of the flexural-torsional buckling classification. It was found that the reduction in the compression strength of the specimens with web openings seems to be negligible. In addition, the predictions based on the AISI Standard were conservative as compared with the test results of the specimens with web openings. Moreover, it appeared that the ANSYS finite element analysis was able to predict the ultimate loads and failure modes of the specimens. In the absence of test data and for the purpose of preliminary design, the ANSYS appears to provide quite an encouraging prediction capability.

中文翻译：

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带腹板开口的细长C形冷弯型钢构件的抗压强度

这项研究调查了具有腹板开口的细长C形冷弯型钢构件的抗压强度。采用有效截面积的概念来进行冷弯受压构件的分析。如AISI标准所述，根据截面有效宽度计算压缩元件的承载能力。该研究测试了总共21个通道样本，包括带有和不带有网孔的C形横截面。基于AISI标准和ANSYS分析，对测试结果和预测结果进行了比较。结果表明，所有观察到的破坏模式均为挠曲-屈曲屈曲分类。已经发现，具有网孔的样品的抗压强度的降低似乎可以忽略不计。此外，与带有网孔的样品的测试结果相比，基于AISI标准的预测是保守的。此外，ANSYS有限元分析似乎能够预测样品的极限载荷和破坏模式。在没有测试数据的情况下，为了进行初步设计，ANSYS似乎提供了令人鼓舞的预测能力。