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Retrofitting of Distressed Post-tensioned Concrete Members by External Post-tensioning

Retrofitting of Distressed Post-tensioned Concrete Members by External Post-tensioning Many of the existing prestressed concrete bridges are in distressed condition in India and abroad. Deterioration occurs due to various reasons. This has considerably reduced the load-carrying capacity of many prestressed concrete (PSC) bridges. Therefore, it is necessary to improve the retrofitting solutions to recover the load-carrying capacity that is lost due to distress. One of the prime techniques that is being used for retrofitting of existing bridges is external post-tensioning. However, behaviour of the retrofitted PSC members is still not understood in depth. It is intended to report the behaviour of retrofitted post-tensioned concrete specimens by external post-tensioning, on which distress was induced by the combined effect of loss of prestress and fatigue deformation before retrofitting. As a result of retrofitting, the ultimate load-carrying capacity has increased by 33% with reference to the fully prestressed control beam specimen. The ductility is observed as 94% of the ductility of the control specimen. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of The Institution of Engineers (India) Series A Springer Journals

Retrofitting of Distressed Post-tensioned Concrete Members by External Post-tensioning

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References (18)

Publisher
Springer Journals
Copyright
Copyright © The Institution of Engineers (India) 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
2250-2149
eISSN
2250-2157
DOI
10.1007/s40030-023-00737-6
Publisher site
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Abstract

Many of the existing prestressed concrete bridges are in distressed condition in India and abroad. Deterioration occurs due to various reasons. This has considerably reduced the load-carrying capacity of many prestressed concrete (PSC) bridges. Therefore, it is necessary to improve the retrofitting solutions to recover the load-carrying capacity that is lost due to distress. One of the prime techniques that is being used for retrofitting of existing bridges is external post-tensioning. However, behaviour of the retrofitted PSC members is still not understood in depth. It is intended to report the behaviour of retrofitted post-tensioned concrete specimens by external post-tensioning, on which distress was induced by the combined effect of loss of prestress and fatigue deformation before retrofitting. As a result of retrofitting, the ultimate load-carrying capacity has increased by 33% with reference to the fully prestressed control beam specimen. The ductility is observed as 94% of the ductility of the control specimen.

Journal

Journal of The Institution of Engineers (India) Series A – Springer Journals

Published: Sep 1, 2023

Keywords: External post-tensioning; Retrofitting; Concrete member; Flexural behaviour; Fatigue; Cyclic; Stress in tendons

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