Experimental Investigation on Seismic Retrofitting of Square RC Columns by Carbon FRP Sheet Confinement Combined with Transverse Short Glass FRP Bars in Bored Holes
Publication: Journal of Composites for Construction
Volume 12, Issue 1
Abstract
Jacketing is less effective to large square/rectangular RC columns due to the inability of the rectangular-shaped jacket in restraining the dilation of concrete in the middle of a straight side. A new retrofit method is proposed in this work by fiber reinforcing the surface concrete in the middle of a straight side. Fiber reinforcing is achieved by inserting small fiber-reinforced polymer (FRP) bars into the concrete in the plastic hinge zone. The inserted FRP bars act as horizontal reinforcement to increase the ductility of the concrete in a similar way as that in normal fiber-reinforced concrete. When this fiber reinforcing technique is combined with the conventional jacketing, the concrete in all parts of a cross section may be effectively confined. In this work, experimental tests were undertaken to investigate the effectiveness of this new retrofit technique. Six half-scaled columns were tested and the test results demonstrated the effectiveness of the method.
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Acknowledgments
The work described in this paper was fully supported by a grant from the Research Grant Council of the Hong Kong Special Administrative Region, China (Project No. CityU 1113/04E).
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 1 • February 2008
Pages: 53 - 60
Copyright
© 2008 ASCE.
History
Received: Jul 28, 2006
Accepted: Dec 5, 2006
Published online: Feb 1, 2008
Published in print: Feb 2008
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