Development of FRP Shear Bolts for Punching Shear Retrofit of Reinforced Concrete Slabs
Publication: Journal of Composites for Construction
Volume 15, Issue 4
Abstract
A fiber-reinforced polymer (FRP) shear bolt system has been recently developed at the University of Waterloo in Canada. The system is used to protect previously built reinforced concrete (RC) slabs against brittle punching shear failure. The system requires drilling small holes in a RC slab around the perimeter of a column, inserting bolts into the holes, and anchoring the bolts at both external surfaces of the slab. Many existing RC slabs have been built without any shear reinforcement. Also, many of these slabs are in corrosive environments, e.g., parking garages, where the use of deicing salts accelerates reinforcement corrosion and concrete deterioration. Therefore, FRPs are ideal materials to be used for such retrofit. The challenge, however, is the development of mechanical end anchorages for FRP rods that are efficient, aesthetic, cost effective, and that can be installed on site. The research presented in this paper includes development of FRP bolts with mechanical anchorages and the results of testing done using the developed systems. A new anchorage technique for the FRP rods based on crimping the rod ends with the aluminum fittings was developed. The testing was done on isolated slab-column specimens representing interior slab-column connections in a continuous flat plate system. The specimens were subjected to simulated gravity loading. The developed FRP bolts worked very well in improving the performance of the slab-column connections and showing the benefits of using FRP in punching shear retrofit of reinforced concrete slabs in corrosive environments.
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Acknowledgments
The authors would like to acknowledge the financial and technical contributions from the following sponsors. The grant to finance the work was received from the ISIS Canada Research Network. The K-Line bolts and crimping was supplied by K-Line Insulators Ltd in Toronto. The Schoeck bolts were supplied by Schoeck Canada. The ready mixed concrete was donated by Hogg Fuel and Supply Ltd. Ready Mix Division in Kitchener, Ontario, Canada. The Huskie crimping tool was provided by PEFCO Ontario. The authors also wish to thank the technical staff of the Structural Laboratory of Civil and Environmental Engineering, University of Waterloo, Canada, for their support and assistance.
References
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 4 • August 2011
Pages: 591 - 601
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 14, 2010
Published online: Nov 1, 2010
Accepted: Nov 2, 2010
Published in print: Aug 1, 2011
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