Stiffness prediction for bolted moment-connections between cold-formed steel members

James Lim, D.A. Nethercot

    Research output: Contribution to journalArticlepeer-review

    99 Citations (Scopus)


    The authors have recently described a cold-formed steel portal framing system in which simple bolted moment-connections, formed through brackets, were used for the eaves and apex joints. Such connections, however, cannot be considered as rigid because of localised in-plane elongation of the bolt-holes caused by bearing against the bolt-shanks. To therefore predict the initial stiffness of such connections, it is necessary to know the initial bolt-hole elongation stiffness k(b). In this paper, a finite element-solid idealisation of a bolted lap joint in shear will be described that can be used to determine k(b); the results obtained are validated against experimental data. A beam idealisation of a cold-formed steel bolted moment-connection is then described, in which spring elements are used to idealise the rotational flexibility of the bolt-groups resulting from bolt-hole elongation: Using the value of k(b) in the beam idealisation, the deflections predicted are shown to be similar to those measured experimentally in laboratory tests conducted on the apex joint of a cold-formed steel portal frame. (C) 2003 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)85-107
    Number of pages23
    JournalJournal of Constructional Steel Research
    Issue number1
    Publication statusPublished - Jan 2004

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Materials Science(all)

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