Effect of Unloading and Reloading on Bearing Strength of Unconfined Cold-Formed Steel Bolted Connections
Publication: Journal of Structural Engineering
Volume 147, Issue 5
Abstract
This data paper presents the experimental investigation of unconfined cold-formed steel double-shear bolted connections where the applied load was stopped at different stages of loading (25% or 65% of the ultimate failure load under monotonic loading) followed by unloading, and finally reloading until failure. A total of 78 bolted connections of cold-formed steel subjected to loading–unloading and reloading conditions with sheet thicknesses ranging from 0.55 to 3.0 mm, bolted with 10, 12, or bolts were investigated and compared to the identical specimens subjected to monotonic loading. The failure mode of the specimens tested under both loading conditions was bearing of the inner sheet. The test results show that ultimate capacities obtained from unloading and reloading tests were, on average, lower than those obtained from the monotonic tests. A similar trend was also observed for the displacement corresponding to the ultimate loads. However, the effects of sheet thickness and bolt diameter were found to be less critical. This study establishes a publicly available database of control cases to build the foundation for further study into similar loading regimes. This paper also alludes to several potential use cases for the available data.
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Data Availability Statement
The laboratory test data used in the present study are publicly available at the following link: https://doi.org/10.5281/zenodo.3937904.
Acknowledgments
The authors would like to thank the Australian Research Council for funding this research through the ARC Research Hub for Australian Steel Manufacturing under the Industrial Transformation Research Hubs scheme (Project ID: IH130100017). The steel materials used in the present laboratory tests were supplied by Trevor Clayton of BlueScope Steel. All specimens were fabricated by Ritchie McLean. The authors would also like to thank the Sustainable Building Research Centre at the Innovation Campus of the University of Wollongong for the use of its facilities. The authors would also like to extend their profound gratitude to Professor Lip H. Teh for conceiving this research idea and his guidance and support throughout this study.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 5 • May 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 12, 2020
Accepted: Nov 23, 2020
Published online: Feb 24, 2021
Published in print: May 1, 2021
Discussion open until: Jul 24, 2021
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