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Effect of web hole spacing on axial capacity of back-to-back cold-formed steel channels with edge-stiffened holes

  • Chi, Yaohui (College of Harbour and Coastal Engineering, Jimei University) ;
  • Roy, Krishanu (Department of Civil and Environmental Engineering, The University of Auckland) ;
  • Chen, Boshan (Department of Civil and Environmental Engineering, The University of Auckland) ;
  • Fang, Zhiyuan (Department of Civil and Environmental Engineering, The University of Auckland) ;
  • Uzzaman, Asraf (School of Computing, Engineering and Physical Sciences, University of the West of Scotland) ;
  • Ananthi, G. Beulah Gnana (Division of Structural Engineering, College of Engineering Guindy Campus, Anna University) ;
  • Lim, James B.P. (Department of Civil and Environmental Engineering, The University of Auckland)
  • Received : 2020.04.27
  • Accepted : 2021.07.02
  • Published : 2021.07.25
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Abstract

Recently, a new generation of cold-formed steel (CFS) channel section with edge-stiffened web holes has been developed by industry in New Zealand. However, no research has been reported in the literature to investigate the axial capacity of back-to-back channels with edge-stiffened web holes. This paper presents a total of 73 new results comprising 29 compression tests and 44 finite element analyses (FEA) on axial capacity of such back-to-back CFS channels. The results show that for back-to-back channels with seven edge-stiffened holes, the axial capacity increased by 19.2%, compared to plain channels without web holes. A non-linear finite element (FE) model was developed and validated against the test results. The validated FE model was used to conduct a parametric study involving 44 FE models. Finely, the tests results were compared with the design strengths calculated from the AISI and AS/NZ standards and from the proposed design equations of Moen and Schafer. From the comparison results, it was found that the AISI and AS/NZ design strengths are only 9% conservative to the test results for plain channels without web holes. While Moen and Schafer equations are conservative by 13% and 47% for axial capacity of CFS back-to-back channels with un-stiffened and edge-stiffened web holes, respectively.

Keywords

Acknowledgement

The authors would like to acknowledge the support of "Howick NZ. Ltd." for providing the test specimens. The experimental work was carried out in the "Structures test hall" at the Department of Civil and Environmental Engineering, in the University of Auckland. The support of the lab technicians is greatly appreciated.

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