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Structural Response and Residual Capacity of S700 High-Strength Steel CHS Columns after Exposure to Elevated Temperatures
| 题名： | Structural Response and Residual Capacity of S700 High-Strength Steel CHS Columns after Exposure to Elevated Temperatures |
| 正文语种： | eng |
| 作者： | Zhong, Yukai;Sun, Yao;Zhao, Ou;Gardner, Leroy |
| 作者单位： | Nanyang Technol Univ Sch Civil & Environm Engn Singapore 639798 Singapore;Xian Jiaotong Liverpool Univ Dept Civil Engn Suzhou 215123 Peoples R China;Nanyang Technol Univ Sch Civil & Environm Engn Singapore 639798 Singapore;Imperial Coll London Dept Civil & Environm Engn London SW7 2AZ England |
| 关键词： | Circular hollow section (CHS);Design analysis;Flexural buckling;Grade S700 high-strength steel;Heating and cooling;Numerical modeling;Pin-ended column tests;Postfire residual capacity |
| 摘要： | 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. |
| 出版年： | 2022 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 148 |
| 期： | 6 |
| 页码： | 04022050.1-04022050.12 |
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