Experimental Investigation of CFS Unequal Plain Angle Compression Members

AbstractGlobal buckling modes of cold-formed steel (CFS) unequal-leg plain angle (UPA) compression members are flexural–torsional buckling (FTB) modes due to their nonsymmetric cross section. Although the behavior of CFS equal plain angle (EPA) members under axial compression has been studied extens...

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Bibliographic Details
Published in:Journal of structural engineering (New York, N.Y.) N.Y.), 2025-01, Vol.151 (1)
Main Authors: Aswathy, K. C. Kalam, Anil Kumar, M. V.
Format: Article
Language:English
Subjects:
Axial compression
Cold working
Cold-formed steel
Compressive strength
Postbuckling
Technical Papers
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Summary:AbstractGlobal buckling modes of cold-formed steel (CFS) unequal-leg plain angle (UPA) compression members are flexural–torsional buckling (FTB) modes due to their nonsymmetric cross section. Although the behavior of CFS equal plain angle (EPA) members under axial compression has been studied extensively, only limited studies in the literature have investigated CFS-UPA members. The results of an experimental study of CFS-UPA specimens under axial compression with fixed support conditions are presented in this paper. This is the first experimental investigation of CFS-UPA compression members in which the postbuckling strength in the FTB mode and global–global interaction between the first two FTB modes (denoted FT1-FT2 interaction) are demonstrated. The test specimens were grouped into three categories—Test A, Test B, and Test C—based on the elastic FTB load ratios of the first two modes (Pcrft2/Pcrft1), corresponding to low (Pcrft2/Pcrft1>50), medium (5
ISSN:0733-9445
1943-541X
DOI:10.1061/JSENDH.STENG-13807