Techno Press


Steel and Composite Structures   Volume 25, Number 6, December 2017, pages 727-734
DOI: http://dx.doi.org/10.12989/scs.2017.25.6.727
 
Strength and stiffness of cold-formed steel portal frame joints using quasi-static finite element analysis
Chia Mohammadjani, Amir M. Yousefi, Shu Qing Cai, G. Charles Clifton and James B.P. Lim

 
Abstract     [Full Text]
    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.
 
Key Words
    cold-formed steel; bolted moment-connections; finite element analysis; quasi-static
 
Address
Chia Mohammadjani, Amir M. Yousefi, Shu Qing Cai, G. Charles Clifton and James B.P. Lim : Department of Civil Engineering and Environmental Engineering, The University of Auckland, New Zealand
 

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