Behavior and Design of Cold-Formed Steel Web-Stiffened Channels under Concentrated Bearing Loads
Publication: Journal of Structural Engineering
Volume 148, Issue 3
Abstract
This study focused on the web crippling and design of web-stiffened channel sections made of cold-formed steel (CFS). CFS web-stiffened channels are expected to have higher buckling loads under compression and bending compared to conventional channel sections without stiffened web. However, research on CFS web-stiffened channel sections under concentrated bearing loads is rather limited. A test program consisting of 29 web crippling experiments was carried out under the loading cases of interior-two-flange (ITF), end-two-flange (ETF), interior loading (IL), and end loading (EL). Both flanges of each channel section were bolted to the supports. The test results were used to establish and validate the finite-element models. Then, the validated numerical models were utilized for a parametric investigation to study the influences of cross-sectional geometry, bearing lengths, and web stiffener dimensions. A total of 576 finite-element analyses were performed in the parametric study. The web crippling design formulas for traditional CFS channels included in the current design standards were assessed by comparing the failure loads attained in the tests and numerical analyses to the predicted values. Finally, a design formula was developed for the design of CFS web-stiffened channels under concentrated bearing loads by modifying the codified web crippling unified equation.
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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 first author is grateful for the support given by the Research Grants Council of Hong Kong for the Hong Kong Ph.D. Fellowship Scheme.
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Published In
Journal of Structural Engineering
Volume 148 • Issue 3 • March 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 19, 2021
Accepted: Oct 6, 2021
Published online: Dec 23, 2021
Published in print: Mar 1, 2022
Discussion open until: May 23, 2022
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