Analytical Model for FRP Confinement of Concrete Columns with and without Internal Steel Reinforcement
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
The paper aims to contribute to a better understanding of the behavior of reinforced concrete columns confined with fiber-reinforced polymer (FRP) sheets. In particular, some new insights on interaction mechanisms between internal steel reinforcement and external FRP strengthening and their influence on efficiency of FRP confinement technique are given. In this context a procedure to generate the complete stress-strain response including new analytical proposals for (1) effective confinement pressure at failure; (2) peak stress; (3) ultimate stress; (4) ultimate axial strain; and (5) axial strain corresponding to peak stress for FRP confined elements with circular and rectangular cross sections, with and without internal steel reinforcement, is presented. Interaction mechanisms between internal steel reinforcement and external FRP strengthening, shown by some experimental results obtained at the University of Padova with accurate measurements, are taken into account in the analytical model. Four experimental databases regarding FRP confined concrete columns, with circular and rectangular cross section with and without steel reinforcement, are gathered for the assessment of some of the confinement models shown in literature and the new proposed model. The proposed model shows a good performance and analytical stress-strain curves approximate some available test results quite well.
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Acknowledgments
The writers wish to thank Anna Mazzucato for the contribution developed during the preparation of her degree thesis. Financial support from the Italian Ministry of Education and Scientific Research (Progetto di Ateneo 2008 cod. UNSPECIFIEDCPDA081713 and UNSPECIFIEDPRIN 2007JHK33Y_003) is gratefully acknowledged.
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Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 693 - 705
Copyright
© 2010 ASCE.
History
Received: Aug 19, 2009
Accepted: Apr 1, 2010
Published online: Apr 7, 2010
Published in print: Dec 2010
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