Modeling Constitutive Relationship of Steel Bar Removed from Corroded PC Beams after Fatigue Considering Spatial Location Effect
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 4
Abstract
Fatigue changes the mechanical behavior of reinforcing bars, significantly reducing the performance of aging concrete structures. This study performed a fatigue loading test on post-tensioned prestressed concrete (PC) beams with various corrosion levels of prestressed tendon. The effect of corrosion on fatigue life and failure modes of test beams were discussed. Steel bars at different distances from the fracture location in beams were removed for static tensile tests. The mechanical properties of the steel bars after fatigue in different locations relative to the failure point were analyzed. A quantitatively constitutive relationship was proposed to characterize the mechanical behavior of steel bars after fatigue. This model can consider the effects of fatigue stress range, fatigue cycles, and fatigue fracture location of steel bars. The experimental results showed that the failure of corroded post-tensioned PC beams initiated from the brittle fracture of prestressed tendon, promoting the fatigue fracture of steel bars. The proposed models were verified by the test data in the literature. The theoretical values were in good agreement with the experimental results. The proposed constitutive relation model considering the location effect can be used to model the uncertain effect caused by fatigue.
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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 work was conducted with the financial support from the National Natural Science Foundation of China (51778068), the Natural Science Foundation of Hunan Province (2019JJ30024), the Special Funds for the Construction of Innovative Provinces in Hunan Province of China (2019RS2035 and 2019SK2171), the Training Program for Excellent Young Innovators of Changsha (kq1802012), the Scientific Research Fund of Hunan Provincial Education Department (17B012), and the Hunan Provincial Innovation Foundation for Postgraduate (CX20190672). The support is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jun 11, 2020
Accepted: Aug 31, 2020
Published online: Jan 21, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 21, 2021
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