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Retrofitting of RC Cantilever Slabs by Bonding FRP Composites

In the past few years, a number Of failures Of reinforced concrete (RC) contilever slabs (canopies and balconies) have occurred in Hong Kong. As a result, ensuring the safety of such structures through periodical inspection and retrofitting has become an important issue for the public as well as the structurol engineering community in Hang Kong. This paper presents a method recently developed at The Hong Kong Polytechnic University in collaboration with L&M Specialist Construction Ltd for retrofitting structurally deficient contilever slabs. The method involves the bonding of glass fibre-reinforced plastic (GFRP) strips to the tension surface of cantilever slabs. Various schemes Of FRP bonding are first described, followed by a brief summary of the behaviour of such retrofitted slabs as observed in laboratory tests. Design equations for flexural strength evaluation are next presented and compared with laboratory test results. Finally, issues that should be considered in design are outlined.