Experimental and Numerical Investigations of High-Cycle Fatigue Properties of HTRB630 High-Strength Steel Bars
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
To explore the application of heat-treated ribbed bar (HTRB) type HTRB630 high-strength steel bars in reinforced concrete bridges, the tensile test and high-cycle fatigue test are carried out. Then, the high-cycle fatigue properties of the specimens are analyzed and discussed from median stress-number of loading cycles () curve, curve, comparison with 500-MPa grade steel bars, and fatigue fracture mechanism. Finally, their high-cycle fatigue properties are investigated numerically, and the influence of stress ratio on their fatigue properties is discussed. The results indicated that the probability-stress-number of loading cycles () curve with a confidence level and a reliability guarantee rate is more accurate than the median curves for the fatigue design of reinforced concrete bridges. In the curve, the stress ranges at 2 million and 10 million cycles are 237.03 and 203.38 MPa, respectively. In the median curve, the stress ranges at 2 million and 10 million cycles of fatigue life of steel bars are 262.77 and 236.08 MPa. The fatigue properties of the specimens are higher than those for the 500-MPa grade steel bars. The fatigue fracture of the specimens consists of a fatigue source zone, crack propagation zone, and transient fracture zone. Microscopically, it is a cleavage fracture in the crack propagation zone; it is micropore aggregation fractures in the instantaneous fracture zone. At a given fatigue life, the fatigue stress range decreases as the stress ratio increases. The fatigue properties of the specimens are better at a higher stress ratio with the same maximum stress.
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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 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; the Natural Science Research Project of Jiangsu Province Colleges and Universities (21KJD560002), China; Suqian Natural Science Foundation Project (K202012), China; Project funded by the research and innovation team of engineering structure seismic technology of Suqian University in 2020, China; and Suqian City Guiding Science and Technology Plan Project (Z2020137), China.
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Received: Jul 8, 2022
Accepted: Nov 18, 2022
Published online: May 16, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 16, 2023
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