Tensile and Low-Cycle Fatigue Properties of HTRB630 High-Strength Steel Bars after Exposure to High Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
Heat-treated ribbed bar 630 (HTRB630) is a new type of reinforcing steel produced in China. The tensile properties and low-cycle fatigue properties of HTRB630 high-strength steel bars after exposure to high temperature are crucial for the seismic performance of reinforced concrete structures potentially subjected to fire. With this aim, HTRB630 high-strength steel bar specimens were heated to high temperatures (200°C, 400°C, 600°C, and 800°C), and cooled to the room temperature by water. The appearance and microstructures of the specimens with different exposure temperatures were observed. The tensile tests and different constant strain amplitude low-cycle fatigue tests were carried out. Test results indicated that the specimens exposed to high temperature below 600°C had good tensile properties and low-cycle fatigue properties. Variations of the metallographic structures of the specimens resulted in different tensile properties and different low-cycle fatigue properties. After exposure to the same temperature, as the strain amplitude increased, the shape of the hysteresis curve of the specimen was fuller, its plastic strain amplitude and plastic strain range and elastic strain range ratio increased, its maximum stress per cycle increased slightly, its softening characteristic was more obvious, and its residual dissipated energy density decreased. All specimens performed ductile fracture failures. Therefore, HTRB630 high-strength steel bars have broad application prospects in antifire reinforced concrete structures.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research has been supported by China Scholarship Council; the Natural Science Research Project of Jiangsu Province Colleges and Universities (21KJD560002), China; the Suqian Natural Science Foundation Project (K202012), China; the Project funded by the research and innovation team of engineering structure seismic technology of Suqian University in 2020, China; the Suqian City Guiding Science and Technology Plan Project (Z2020137), China; the Research and Innovation Team Project of Suqian College (2021TD04), China; and the Fifth Provincial Research Funding Project of “333 High-level Talent Training” in 2020 (BRA2020241), China.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 12, 2023
Accepted: Jul 24, 2023
Published online: Nov 23, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 23, 2024
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