Quantifying High Temperature–Induced Breakage Instant of Prestressing High-Strength Steel Wire
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 7
Abstract
The danger of high-strength steel wire (HSSW) under high temperatures is twofold. One is the significant degradation of the material properties of high-strength steel (HSS), which has been extensively studied. The other, which appears to be important in some issues but has not been investigated, is that the breakage of HSSW is very hazardous from the perspective of dynamics because enormous stress can be released within a very short time. This paper reports an experimental study to quantify the transitory breakage instant. HSSW specimens with different section dimensions (intact 7.0 mm, intact 5.3 mm, and damaged 7.0 mm) were heated to failure under various steady prestressing forces at two constant temperature rates ( and ). High-speed sampling technology was applied to capture the axial force variation before and during the rupture process. Through data regression, the breakage instant caused by high temperature was quantified by three elements, i.e., the ratio of initial force of breakage to prestressing force, the time history, and the breakage duration. The results showed that the parametric characteristics of rupture instant is dominated by the ratio of the prestressing force to the ultimate force at room temperature. In addition, the extent of the initial section damage has a positive relation with the initial force which indicates the start of the breakage.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The work described here is financially supported in part by China Scholarship Council (201706090239). The authors thank Zehui Niu, Xusheng Sun, Jian Guan, Bo Yuan, Chenxu Cao, and Zehuang Wang at the School of Transportation of Southeast University for their assistance in the experiments conducted; and Jiangsu Fasten Group for the wire specimens they supplied. The authors take sole responsibility for the opinions expressed in the paper, which may not represent the views of the sponsor.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Sep 10, 2019
Accepted: Jan 6, 2020
Published online: Apr 30, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 30, 2020
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