Strengthening of Eccentrically Loaded Reinforced Concrete Columns with Fiber-Reinforced Polymer Wrapping System: Experimental Investigation and Analytical Modeling
Publication: Journal of Composites for Construction
Volume 13, Issue 1
Abstract
This paper presents the results of experimental program and analytical modeling for performance evaluation of a fiber-reinforced polymer (FRP) wrapping system to upgrade eccentrically loaded reinforced concrete (RC) columns. A total of 12 RC columns with end corbels were tested. The test specimen had an overall length of . Each end corbel had a cross section of and a length of . The specimen in the test region was having a longitudinal steel ratio of 1.9%. Test parameters included confinement condition (no wrapping, full FRP wrapping, and partial FRP wrapping), and eccentricity-to-section height ratio (0.3, 0.43, 0.57, and 0.86). Research findings indicated that the strength gain caused by FRP wrapping decreased as was increased. Full FRP wrapping resulted in about 37% enhancement in compression strength at a nominal of 0.3, whereas only 3% strength gain was recorded at a nominal of 0.86. The compression strengths of the partially wrapped columns were on average 5% lower than those of the fully wrapped columns. A nonlinear, second-order analysis that accounts for the change in eccentricity caused by the lateral deformation was proposed to predict the columns strength. A comparison between analytical and experimental results of the present study in addition to data published in the literature demonstrated the accuracy and validity of the proposed analysis.
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Acknowledgments
The writer would like to express appreciation to Research Affairs at the UAE University for the financial support of this project under fund Grant No. UNSPECIFIED02-01-7-11/06. The writer also expresses gratitude to the Undergraduate Research Assistants and Laboratory Specialists at the UAE University for their help throughout the testing.
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© 2009 American Society of Civil Engineers.
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Received: Oct 4, 2007
Accepted: Jan 24, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
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