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Steel and Composite Structures Volume 40, Number 2, July25 2021 , pages 287-305 DOI: https://doi.org/10.12989/scs.2021.40.2.287 |
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Effect of web hole spacing on axial capacity of back-to-back cold-formed steel channels with edge-stiffened holes |
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Yaohui Chi, Krishanu Roy, Boshan Chen, Zhiyuan Fang, Asraf Uzzaman, G. Beulah Gnana Ananthi and James B.P. Lim
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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. | ||
| Key Words | ||
| back-to-back channels; cold-formed steel; compression tests; edge-stiffened holes; finite element modelling | ||
| Address | ||
| Yaohui Chi: College of Harbour and Coastal Engineering, Jimei University, China Krishanu Roy, Boshan Chen, Zhiyuan Fang and James B.P. Lim: Department of Civil and Environmental Engineering, The University of Auckland, New Zealand Asraf Uzzaman: School of Computing, Engineering and Physical Sciences, University of the West of Scotland, United Kingdom G. Beulah Gnana Ananthi: Division of Structural Engineering, College of Engineering Guindy Campus, Anna University, Chennai, India | ||