Behavior and Design of Normal- and High-Strength Steel SHS and RHS Columns
Publication: Journal of Structural Engineering
Volume 146, Issue 11
Abstract
The behavior and design of hot-rolled and cold-formed steel square and rectangular hollow section (SHS and RHS) columns, made of both normal- and high-strength material, are addressed in this paper. A series of experiments on hot-rolled high-strength steel SHS columns was first conducted—six tests on S690 SHS columns and six tests on S770 SHS columns were performed. Finite-element (FE) models were developed to replicate the experimental results and to carry out parametric studies to expand the column buckling data pool. The accuracy of the European and North American buckling design rules for normal- and high-strength steel SHS and RHS columns was evaluated through comparisons with the freshly generated test and FE results, as well as with existing test data collected from the literature. Finally, a modified approach was proposed and statistically verified in accordance with existing standards; the new approach features an imperfection factor that is a continuous function of yield strength, reflecting the reducing relative influence of residual stresses and global imperfections with increasing steel grades. Improved consistency in resistance predictions over the existing design provisions is demonstrated across a wide range of steel grades and relative slenderness values.
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Acknowledgments
The authors gratefully acknowledge the Skempton scholarship from Imperial College London for the financial support. The authors would also like to thank Trevor Stickland and Soh Harn Chong for their assistance during the experiments.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 22, 2019
Accepted: Mar 2, 2020
Published online: Aug 18, 2020
Published in print: Nov 1, 2020
Discussion open until: Jan 18, 2021
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