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Steel and Composite Structures Volume 42, Number 4, February25 2022 , pages 513-538 DOI: https://doi.org/10.12989/scs.2022.42.4.513 |
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Experimental and numerical study of an innovative 4-channels cold-formed steel built-up column under axial compression |
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Beulah Gnana Ananthi G, Krishanu Roy and James B.P. Lim
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Abstract | ||
This paper reports on experiments addressing the buckling and collapse behavior of an innovative built-up coldformed steel (CFS) columns. The built-up column consists of four individual CFS lipped channels, two of them placed back-toback at the web using two self-drilling screw fasteners at specified spacing along the column length, while the other two channels were connected flange-to-flange using one self-drilling screw fastener at specified spacing along the column length. In total, 12 experimental tests are reported, covering a wide range of column lengths from stub to slender columns. The initial geometric imperfections and material properties were determined for all test specimens. The effect of screw spacing, load-versus axial shortening behaviour and buckling modes for different lengths and screw spacing were investigated. Nonlinear finite element (FE) models were also developed, which included material nonlinearities and initial geometric imperfections. The FE models were validated against the experimental results, both in terms of axial capacity and failure modes of built-up CFS columns. Furthermore, using the validated FE models, a parametric study was conducted which comprises 324 models to investigate the effect of screw fastener spacing, thicknesses and wide range of lengths on axial capacity of back-to-back and flange-to-flange built-up CFS channel sections. Using both the experimental and FE results, it is shown that design in accordance with the American Iron and Steel Institute (AISI) and Australia/New Zealand (AS/NZS) standards is slightly conservative by 6% on average, while determining the axial capacity of back-to-back and flange-to-flange built-up CFS channel sections. | ||
Key Words | ||
axial strength; back-to-back and flange-to-flange channels; buckling; cold-formed steel; direct strength method; finite element modeling; tests | ||
Address | ||
Beulah Gnana Ananthi G:Division of Structural Engineering, College of Engineering Guindy Campus, Anna University, Chennai, India Krishanu Roy:School of Engineering, The University of Waikato, Hamilton 3216, New Zealand James B.P. Lim:Department of Civil and Environmental Engineering, The University of Auckland, Auckland, New Zealand | ||