TY - JOUR
T1 - Cold-formed steel portal frame moment-resisting joints
T2 - behaviour, capacity and design
AU - Chen, Xin
AU - Blum, H.B.
AU - Roy, Krishanu
AU - Pouladi, Pouya
AU - Uzzaman, Asraf
AU - Lim, James B.P.
N1 - Funding Information:
The author wishes to acknowledge the Centre for eResearch at the University of Auckland for their help in facilitating this research. http://www.eresearch.auckland.ac.nz
Publisher Copyright:
© 2021 Elsevier Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/8/31
Y1 - 2021/8/31
N2 - The work presented in this paper investigates the strength of moment-resisiting apex brackets of cold-formed steel portal frames. The results of two previously reported full-scale portal frame tests, where the frames failed through buckling of the apex bracket, were used to validate a finite element model that included material nonlinearity, geometric imperfections, and bolt bearing behaviour. From portal frame test results as well as the finite element results, the importance of appropriate detailing for the apex brackets for strength is demonstrated. A simplified finite element model of the apex bracket is then presented, again validated against previously reported experimental tests. The effects of geometrical parameters of the brackets, bolt-group configuration, and yield stress of brackets were investigated through a parametric study comprising 648 models. From the results of this parametric study, design equations are proposed that can be used by practicing engineers to predict the strength of apex brackets used for cold-formed steel portal frames.
AB - The work presented in this paper investigates the strength of moment-resisiting apex brackets of cold-formed steel portal frames. The results of two previously reported full-scale portal frame tests, where the frames failed through buckling of the apex bracket, were used to validate a finite element model that included material nonlinearity, geometric imperfections, and bolt bearing behaviour. From portal frame test results as well as the finite element results, the importance of appropriate detailing for the apex brackets for strength is demonstrated. A simplified finite element model of the apex bracket is then presented, again validated against previously reported experimental tests. The effects of geometrical parameters of the brackets, bolt-group configuration, and yield stress of brackets were investigated through a parametric study comprising 648 models. From the results of this parametric study, design equations are proposed that can be used by practicing engineers to predict the strength of apex brackets used for cold-formed steel portal frames.
KW - apex brackets
KW - cold-formed steel
KW - design equations
KW - finite element analysis
KW - portal frames
UR - http://www.scopus.com/inward/record.url?scp=85105694205&partnerID=8YFLogxK
U2 - 10.1016/j.jcsr.2021.106718
DO - 10.1016/j.jcsr.2021.106718
M3 - Article
AN - SCOPUS:85105694205
SN - 0143-974X
VL - 183
JO - Journal of Constructional Steel Research
JF - Journal of Constructional Steel Research
M1 - 106718
ER -