Recently, a new generation of cold-formed steel (CFS) channel sections with edge-stiffened circular holes have been developed by industry in New Zealand. No previous research, however, has considered the web crippling strength of CFS channel sections with edge-stiffened circular web holes under the interior-two-flange (ITF) loading conditions. In this paper, a combination of experimental investigation and non-linear finite element analysis (FEA) are used to investigate the effect of edge-stiffened holes under ITF loading conditions; for comparison, channel sections without holes and with unstiffened holes are also considered. In total, 30 web crippling test results are reported. A non-linear finite element (FE) model is described, and the results were compared against the test results, which showed a good agreement in terms of both the web crippling strength and failure modes. The results indicate that the stiffened web holes can significantly improve the web crippling strength of CFS channel sections. Using the validated FE model, a parametric study was conducted which include 1116 FE analyses, covering the effect of different hole sizes, edge-stiffener lengths and fillet radii, length of the bearing plates and position of the holes in the web. From the results of the parametric study, design recommendations in the form of web crippling strength reduction factors are proposed, that are conservative to both the experimental and FE results.

最近，新西兰工业界已经开发出了带有边缘加硬圆孔的新一代冷弯型钢（CFS）槽型。但是，以前没有研究考虑过在内两法兰（ITF）载荷条件下带有边缘加筋的圆形腹板孔的CFS通道截面的腹板抗压强度。本文结合实验研究和非线性有限元分析（FEA）研究了ITF载荷条件下边缘加劲孔的影响。为了进行比较，还考虑了没有孔且未加硬孔的通道部分。总共报告了30个卷纸测试结果。描述了非线性有限元（FE）模型，并将结果与​​测试结果进行了比较，这在卷纸强度和失败模式方面均显示出良好的一致性。结果表明，加强的腹板孔可以显着提高CFS通道截面的腹板抗压强度。使用经过验证的有限元模型，进行了一项参数研究，其中包括1116个有限元分析，涵盖了不同孔尺寸，边缘加劲肋长度和圆角半径，支承板的长度以及孔在网中的位置的影响。从参数研究的结果中，提出了以腹板瘫痪强度降低因子的形式提出的设计建议，这些建议对于实验结果和有限元分析结果都是保守的。进行了一项参数研究，其中包括1116个有限元分析，涵盖了不同孔尺寸，边缘加劲肋长度和圆角半径，支承板的长度以及孔在腹板中的位置的影响。根据参数研究的结果，提出了以腹板压扁强度降低因子的形式提出的设计建议，这些建议对实验结果和有限元分析结果均较为保守。进行了一项参数研究，其中包括1116个有限元分析，涵盖了不同孔尺寸，边缘加劲肋长度和圆角半径，支承板的长度以及孔在腹板中的位置的影响。根据参数研究的结果，提出了以腹板压扁强度降低因子的形式提出的设计建议，这些建议对实验结果和有限元分析结果均较为保守。