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Strength and stiffness of cold-formed steel portal frame joints using quasi-static finite element analysis

  • Mohammadjani, Chia (Department of Civil Engineering and Environmental Engineering, The University of Auckland) ;
  • Yousefi, Amir M. (Department of Civil Engineering and Environmental Engineering, The University of Auckland) ;
  • Cai, Shu Qing (Department of Civil Engineering and Environmental Engineering, The University of Auckland) ;
  • Clifton, G. Charles (Department of Civil Engineering and Environmental Engineering, The University of Auckland) ;
  • Lim, James B.P. (Department of Civil Engineering and Environmental Engineering, The University of Auckland)
  • Received : 2017.05.31
  • Accepted : 2017.09.19
  • Published : 2017.12.30
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Abstract

This paper describes a quasi-static finite element analysis, which uses the explicit integration method, of the apex joint of a cold-formed steel portal frame. Such cold-formed steel joints are semi-rigid as a result of bolt-hole elongation. Furthermore, the channel-sections that are being connected have a reduced moment capacity as a result of a bimoment. In the finite element model described, the bolt-holes and bolt shanks are all physically modelled, with contact defined between them. The force-displacement curves obtained from the quasi-static analysis are shown to be similar to those of the experimental test results, both in terms of stiffness as well as failure load. It is demonstrated that quasi-static finite element analysis can be used to predict the behavior of cold-formed steel portal frame joints and overcome convergence issues experienced in static finite element analysis.

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