Wire Breakage Detection Using Relative Strain Variation in Unbonded Posttensioning Anchors
Publication: Journal of Bridge Engineering
Volume 20, Issue 1
Abstract
Recent problems with grouted posttensioning tendons in U.S. bridges have led to interest in tendons that are not grouted, but rather filled with a pliable corrosion protection system such as grease or wax. The use of a flexible filler material in place of cementitious grout results in an unbonded tendon, which not only affects the structural behavior but also enables the application of new methods for improved monitoring and maintenance. This paper outlines a novel continuous monitoring approach that aims to detect wire breakage in unbonded tendons based on relative strain variation in the anchor head (or wedge plate). The feasibility of the method is investigated using a finite-element model calibrated with experimental data from a seven-strand anchor head. The model is subsequently extended to a 19-strand anchor head to assess the method’s performance on detection, localization, and quantification of tendon damage. The numerical results confirm the correlation between wire breakage and relative strain variation among the monitoring points and illustrate the method’s effectiveness in determining the location and severity of damage.
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Acknowledgments
The authors appreciate the strong support from Dr. Nam-Ho Kim in the Department of Mechanical and Aerospace Engineering at the University of Florida (UF) for access to computational resources. Sincere gratitude is also extended to Dr. Christopher Ferraro at the Weil Hall Structures Laboratory at UF for fabricating the stressing frame. The research project is in collaboration with and funded by the Florida DOT (FDOT), and the authors are grateful for that enduring commitment.
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 1 • January 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 15, 2013
Accepted: Apr 11, 2014
Published online: May 7, 2014
Published in print: Jan 1, 2015
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