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Polymers 2016, 8(5), 186; doi:10.3390/polym8050186

Cross-Sectional Unification on the Stress-Strain Model of Concrete Subjected to High Passive Confinement by Fiber-Reinforced Polymer

1,2
,
2,3,* and 2,4
1
School of Civil Engineering and Mechanics, Huazhong University of Science & Technology, Wuhan 430074, China
2
Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong SAR, China
3
Department of Civil, Construction and Environmental Engineering, Marquette University, Milwaukee, WI 53233, USA
4
School of Civil, Environmental and Chemical Engineering, RMIT University, VIC 3001, Melbourne, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 2 April 2016 / Revised: 28 April 2016 / Accepted: 5 May 2016 / Published: 11 May 2016
View Full-Text   |   Download PDF [3049 KB, uploaded 11 May 2016]   |  

Abstract

The stress-strain behavior of concrete can be improved by providing a lateral passive confining pressure, such as fiber-reinforced polymer (FRP) wrapping. Many axial stress-strain models have been proposed for FRP-confined concrete columns. However, few models can predict the stress-strain behavior of confined concrete columns with more than two specified cross-sections. A stress-strain model of FRP-confined concrete columns with cross-sectional unification was developed in this paper based on a database from the existing literature that includes circular, square, rectangular and elliptical concrete columns that are highly confined by FRP jackets. Using the database, the existing theoretical models were evaluated. In addition, the ultimate stress and strain models with cross-sectional unification were proposed using two parameters: the cross-sectional aspect ratio and corner radius ratio. The elliptical cross-section can be considered as a rectangular one with a special corner radius for the model calculations. A simple and accurate model of the equivalent corner radius ratio for elliptical columns was proposed. Compared to the other existing models and experimental data, the proposed models show good performance. View Full-Text
Keywords: fiber-reinforced polymer (FRP); concrete; confinement; stress-strain relationship; cross-sectional unification; modeling fiber-reinforced polymer (FRP); concrete; confinement; stress-strain relationship; cross-sectional unification; modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cao, Y.-G.; Jiang, C.; Wu, Y.-F. Cross-Sectional Unification on the Stress-Strain Model of Concrete Subjected to High Passive Confinement by Fiber-Reinforced Polymer. Polymers 2016, 8, 186.

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