Confinement Model of Concrete with Externally Bonded FRP Jackets or Posttensioned FRP Shells
Publication: Journal of Structural Engineering
Volume 133, Issue 9
Abstract
A design-oriented confinement model for square and rectangular columns confined with bonded fiber-reinforced polymer (FRP) jackets, and shape-modified square and rectangular sections confined with posttensioned FRP shells is developed. The proposed design model for FRP-confined concrete columns is based on the bilinear four-parameter formulation by Richard and Abbott. The axial compressive strength of FRP-confined concrete is obtained using concrete plasticity theory based on the five parameter Willam and Warnke model. The ultimate axial strain of FRP-confined concrete is obtained from a strain-based approach depending on either passive or active confinement; the ultimate axial strain is based on the concepts of secant concrete modulus and strain dependent stiffness established by Pantazopoulou and Mills. Comparisons of the proposed stress-strain model with uniaxial compression experiments for columns with bonded FRP jackets or posttensioned FRP shells, performed by the writers and other researchers, show satisfactory agreement for the entire stress-strain curve.
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Acknowledgments
The writers acknowledge Professor Lawrence D. Reaveley of the University of Utah for constructive discussions. The writers acknowledge the financial support provided by the Utah Department of Transportation, the contribution of FRP composite materials from Sika and Air Logistics, and the contribution of Type K cement and Komponent from CTS Company.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 9 • September 2007
Pages: 1288 - 1296
Copyright
© 2007 ASCE.
History
Received: Sep 13, 2006
Accepted: Feb 28, 2007
Published online: Sep 1, 2007
Published in print: Sep 2007
Notes
Note. Associate Editor: Yan Xiao
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