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Fatigue Tests on Fe-SMA Strengthened Steel Plates Considering Thermal Effects
| 题名： | Fatigue Tests on Fe-SMA Strengthened Steel Plates Considering Thermal Effects |
| 正文语种： | eng |
| 作者： | Chen, Zhen-Yu;Gu, Xiang-Lin;Zhao, Xiao-Ling;Ghafoori, Elyas;Yu, Qian-Qian |
| 作者单位： | Tongji Univ||Tongji Univ;Tongji Univ||Tongji Univ;Hong Kong Polytech Univ;Leibniz Univ Hannover;Tongji Univ||Tongji Univ |
| 关键词： | Iron-based shape memory alloy (Fe-SMA);Steel plate;Strengthening;Fatigue;Temperature |
| 摘要： | An iron-based shape memory alloy (Fe-SMA) can be used to conveniently apply prestress strengthening via a heating and cooling procedure. Material-level tests demonstrated that prestress of Fe-SMAs is sensitive to mechanical and thermal loading. Durability of steel structures strengthened by Fe-SMAs when subjected to harsh service conditions, such as coupled thermomechanical cycles is not fully understood. In this study, high-cycle fatigue tests were conducted on damaged steel plates retrofitted with Fe-SMA strips. Four temperature scenarios were adopted: room temperature (RT), a low temperature (LT) of -20 degrees C, a high temperature (HT) of 60 degrees C, and a cyclic temperature (CT) from -20 degrees C to 60 degrees C. Results showed that regardless of temperature variation, the Fe-SMA presented reliable repairing effects on steel plates, of which, the fatigue life was 2.1-3.5 times larger than that of the unstrengthened samples. The difference in coefficients of thermal expansion (CTEs) between the Fe-SMA and steel, as well as loss of prestress of the Fe-SMA due to fatigue and thermal loading, both affected the fatigue performance of the retrofitted specimens. |
| 出版年： | 2023 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 149 |
| 期： | 3 |
| 页码： | 04022255.1-04022255.13 |
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