Structural Response and Residual Capacity of S700 High-Strength Steel CHS Columns after Exposure to Elevated Temperatures
Publication: Journal of Structural Engineering
Volume 148, Issue 6
Abstract
The structural behavior and residual capacity of S700 high-strength steel circular hollow section (CHS) columns after exposure to elevated temperatures were studied through testing and numerical modeling. The testing program was conducted on 10 S700 high-strength steel CHS columns and comprised heating and cooling of the specimens as well as postfire material testing, measurements of initial geometric imperfections, and pin-ended column tests. Numerical simulations were subsequently performed, where finite element models were built and validated with reference to the experimental results and afterward used to conduct parametric studies to obtain further numerical data. Given that there are no specific provisions for the design of steel structures after exposure to elevated temperatures, the relevant room-temperature design buckling curves were evaluated, using postfire material properties, for their applicability to S700 high-strength steel CHS columns after exposure to elevated temperatures, based on the experimental and numerical data. The evaluation results indicated that the buckling curves prescribed in the American specification and Australian standard lead to accurate and consistent residual capacity predictions for S700 high-strength steel CHS columns after exposure to elevated temperatures, while the Eurocode buckling curve yields conservative predictions of residual capacity. A revised Eurocode buckling curve was then proposed, and resulted in a higher level of accuracy than its original counterpart.
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Data Availability Statement
All data, code, and models generated and used during this study appear in the published article.
Acknowledgments
The specimens tested in the present paper were fabricated and sponsored by SSAB, AB. The authors appreciate Mr. Yong Cheng Lim, Mr. Subasanran Chelladurai, and Mr. Cheng Hoon Tui, David for providing assistance during the experiments. The first author receives financial support for his Ph.D. study from a JTC Research Project (Award No. 04SBS000325C120).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 6 • June 2022
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© 2022 American Society of Civil Engineers.
History
Received: Jul 30, 2021
Accepted: Jan 21, 2022
Published online: Mar 22, 2022
Published in print: Jun 1, 2022
Discussion open until: Aug 22, 2022
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