Factors affecting debonding of FRP (fiber-reinforced polymer) rehabilitated concrete beams

Hughes, W.D., and Karunasena, W.M. (2004) Factors affecting debonding of FRP (fiber-reinforced polymer) rehabilitated concrete beams. In: Proceedings of the 3rd International Conference on Advances in Structural Engineering and Mechanics, pp. 871-880. From: 3rd International Conference on Advances in Structural Engineering and Mechanics, 2-4 Sep 2004, Seoul, Korea.

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Abstract

Many ex1stmg concrete structures are in need of replacement or rehabilitation due to functionally obsolete or structurally deficient members caused by deterioration and overloading. The current trend is leading towards rehabilitation using epoxy bonded fibre reinforced polymer (FRP) strips. This paper presents an experimental study that focused on the factors affecting debonding of FRP rehabilitated concrete beams. Fifteen steel reinforced concrete beams were constructed and tested under four point bending. Thirteen of these beams were pre-loaded before being externally retrofitted (rehabilitated) with a carbon fibre-reinforced polymer strip. Different methods of surface preparation along with two methods of end anchorage were investigated. The effects of water and moisture on bond strength were also considered. Two levels of pre¬loading were trialed prior to rehabilitation in order to determine the extent at which rehabilitation becomes ineffective. Beams with T-end FRP strips showed the most consistent improvement due to rehabilitation, with one beam resisting the highest load of all beams tested. The T-end FRP strips reduces the shear stress between the concrete -FRP interface, thus effectively delaying the strip end debonding failure. It was also found that the bond produced by sand-blasting is superior to that produced by wire brushing. The beams preloaded to 70% capacity before rehabilitation responded with increased stiffness and moment capacity than those preloaded to 100% capacity.

Item ID: 14770
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: carbon fibre; concrete beam; debonding; failure modes; rehabilitation
ISBN: 89-89693-10-1-98530
Date Deposited: 31 Aug 2017 23:32
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090502 Construction Engineering @ 50%
09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering @ 50%
SEO Codes: 87 CONSTRUCTION > 8799 Other Construction > 879999 Construction not elsewhere classified @ 40%
87 CONSTRUCTION > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials @ 30%
87 CONSTRUCTION > 8704 Construction Processes > 870401 Civil Construction Processes @ 30%
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