Beam-Column Tests of Cold-Formed Steel Built-Up Closed Sections
Publication: Journal of Structural Engineering
Volume 148, Issue 4
Abstract
This study aimed to investigate the buckling behavior of cold-formed steel built-up closed section members subjected to combined minor axis bending and compression. The channels were fabricated from zinc-coated steel sheets of grades G500 and G550 to compose built-up closed sections. A total of 30 beam-column specimens with nominal member lengths of 300, 900, and 1,500 mm as well as nominal plate thicknesses of 0.75 and 1.2 mm were eccentrically loaded under pin-ended boundary condition. The initial loading eccentricity was varied for the specimens in each test series to obtain the data evenly distributed in the axial load-moment interaction diagram. Experimental results including failure modes, loading capacities, and full-history responses of the test specimens were obtained. In addition, the experimental loading capacities were compared with nominal strengths to evaluate the suitability of the provisions as stipulated in the North American specification, Australian/New Zealand standard, European code, and American specification for the built-up section beam-columns. It is shown that the aforementioned design codes are overall unreliable and unconservative for strength predictions of the cold-formed steel built-up closed section members under combined minor axis bending and compression.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors are grateful to M Metal Pte Ltd. (Singapore) for supplying the CFS members. The authors also thank Mr. Deyu Wu for his assistance in the test program as part of his undergraduate final year project at the University of Hong Kong.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 4 • April 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 6, 2021
Accepted: Nov 11, 2021
Published online: Feb 3, 2022
Published in print: Apr 1, 2022
Discussion open until: Jul 3, 2022
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