Degradation of Mechanical Behavior of Corroded Prestressing Wires Subjected to High-Cycle Fatigue Loading
Publication: Journal of Bridge Engineering
Volume 22, Issue 5
Abstract
This paper presents an experimental investigation of the degradation of the mechanical behavior of corroded prestressing wires under high-cycle fatigue loading. To quantify the influence of corrosion degree, stress range, and loading cycles on the wires’ mechanical properties, static tensile tests were performed on corroded prestressing wires with a predetermined fatigue-loading history. It was observed that after high-cycle fatigue loading, all corroded prestressing wires failed around corrosion pits as a result of uneven corrosion. The fracture surfaces no longer presented a cup-and-cone pattern, and the shear lip disappeared. The ductility of prestressing wires is very sensitive to high-cycle fatigue loading and corrosion. The postyield branch became dramatically shorter and even disappeared with increased corrosion degrees and loading cycles. With the increased degrees of corrosion and loading cycles, a significant reduction was found in the ultimate strength and ultimate strain of corroded prestressing wires, with little effect on effective elastic stiffness. The theoretical degradation models of the ultimate strength and ultimate strain were established for corroded prestressing wires subject to high-cycle fatigue loading and were found to be in good agreement with experimental results.
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Acknowledgments
This research project was financially supported by the National Basic Research Program of China (973 Program) (Grant 2015CB655103) and National Natural Science Foundation of China (Grant 51578402).
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 5 • May 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 15, 2016
Accepted: Nov 17, 2016
Published online: Feb 3, 2017
Published in print: May 1, 2017
Discussion open until: Jul 3, 2017
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