Prestress Loss Diagnostics in Pretensioned Concrete Structures with Corrosive Cracking
Publication: Journal of Structural Engineering
Volume 146, Issue 3
Abstract
Concrete cracking induced by strand corrosion can degrade bond strength and lead to prestress loss. A novel model is proposed to predict corrosion-induced prestress loss in pretensioned concrete structures. The coupling effects of concrete cracking and bond degradation are incorporated into the model. An experimental study is conducted to evaluate the effective prestress in eight corroded pretensioned concrete beams under various stress levels. Experimental results are employed to validate the proposed model. Results demonstrate that the proposed model can accurately predict prestress loss in corroded pretensioned concrete structures. Prestress loss depends on the corrosion degree. Corrosion-induced concrete cracking may not degrade bond strength and effective prestress unless corrosion loss exceeds 6.6%. As corrosion further progresses, bond strength and effective prestress decrease monotonically and then reduce to zero when corrosion loss reaches 34.0%.
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Acknowledgments
This work was conducted with financial support from the State Key Development Program for Basic Research of China (Grant No. 2015CB057705), and the National Natural Science Foundation of China (Grant Nos. 51678069, 51708477). Their support is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 28, 2018
Accepted: Aug 13, 2019
Published online: Jan 13, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 13, 2020
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