Assessing the Efficiency of CFRP Discrete Confinement Systems for Concrete Cylinders
Publication: Journal of Composites for Construction
Volume 12, Issue 2
Abstract
Concrete columns requiring strengthening intervention always contain a certain percentage of steel hoops. Applying strips of wet layup carbon fiber-reinforced polymer (CFRP) sheets inbetween the existent steel hoops might, therefore, be an appropriate confinement technique with both technical and economic advantages, when full wrapping of a concrete column is taken as a basis of comparison. To assess the effectiveness of this discrete confinement strategy, circular cross-sectional concrete elements confined by distinct arrangements of strips of CFRP sheet are submitted to a direct compression load up to the failure point. The influence of the width of the strip, distance between strips, number of CFRP layers per strip, CFRP stiffness, and concrete strength class on the increase of the load carrying capacity and ductility of concrete columns, is evaluated. An analytical model is developed to predict the compressive stress-strain relationship of concrete columns confined by discrete and continuous CFRP arrangements. The main results of the experimental program are presented and analyzed and used to assess the model performance.
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Acknowledgments
The writers of the present work wish to acknowledge the generous support provided by S&P Clever Reinforcement and MBT Bettor Portugal. The second writer is grateful for the financial support by PRODEP Action No. UNSPECIFIED5.3/N/199.014/01.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 2 • April 2008
Pages: 134 - 148
Copyright
© 2008 ASCE.
History
Received: May 2, 2006
Accepted: Mar 6, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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