Bond Strength of Lap-Spliced Bars in Concrete Confined with Composite Jackets
Publication: Journal of Composites for Construction
Volume 15, Issue 2
Abstract
The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study to confine old-type reinforced concrete (RC) columns with limited capacity because of bond failure at lap-splice regions. The local bond strength between lap-spliced bars and concrete was measured experimentally along the lap-splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of the two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap-spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap-splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.
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Acknowledgments
The writers wish to thank Lecturer C. Papanicolaou for her assistance in the experimental program. The work reported in this paper was funded by the UNSPECIFIEDGreek General Secretariat for Research and Technology through the project ARISTION, within the framework of the Built Environment and Management of Seismic Risk program.
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Information
Published In
Journal of Composites for Construction
Volume 15 • Issue 2 • April 2011
Pages: 156 - 167
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 8, 2009
Accepted: Mar 18, 2010
Published in print: Apr 1, 2011
Published online: Apr 6, 2011
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