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    Nonlinear behaviour of back-to-back gapped built-up cold-formed steel channel sections under compression

    Access Status
    Fulltext not available
    Authors
    Roy, K.
    Ting, T.
    Lau, Hieng Ho
    Lim, J.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Roy, K. and Ting, T. and Lau, H.H. and Lim, J. 2018. Nonlinear behaviour of back-to-back gapped built-up cold-formed steel channel sections under compression. Journal of Constructional Steel Research. 147: pp. 257-276.
    Source Title
    Journal of Constructional Steel Research
    DOI
    10.1016/j.jcsr.2018.04.007
    ISSN
    0143-974X
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/68767
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier Ltd In cold-formed steel structures, such as trusses and portal frames, the use of back-to-back gapped built-up cold-formed steel channel-sections for column members are becoming increasingly popular. In such an arrangement, the lowest flexural buckling mode may not necessarily be overall buckling of the whole column. In the literature, only three test results have been previously reported for such cold-formed steel columns, and limited to values of non-dimensional slenderness ranging from 1.08 to 1.16. This issue is considered herein. The results of 40 experimental tests are reported, conducted on back-to-back gapped built-up cold-formed steel channel-sections covering the range of non-dimensional slenderness from stub to slender columns. A nonlinear finite element model is then described that shows good agreement with the experimental results. The finite element model is then used for the purposes of a study comprising 84 models. Using the experimental and finite element results, it is shown that design in accordance with the American Iron and Steel Institute (AISI) and Australian and New Zealand Standards (AS/NZS) can be conservative by as much as 53%. However, use of a modification to the non-dimensional slenderness, that considers the gap, results in the design standards being within 5% conservative with respect to the experimental and finite element results.

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