Behavior of Large-Scale Rectangular Columns Confined with FRP Composites |
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Authors: | H. Toutanji M. Han J. Gilbert S. Matthys |
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Affiliation: | 1Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of Alabama in Huntsville, Huntsville, AL 35805 (corresponding author). E-mail: toutanji@cee.uah.edu 2Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Alabama in Huntsville, Huntsville, AL 35805. 3Professor, Dept. of Mechanical and Aerospace Engineering, Univ. of Alabama in Huntsville, Huntsville, AL 35805. 4Professor, Dept. of Structure Engineering, Ghent Univ., Technologiepark-Zwijnaarde 9, B-9052 Gent, Belgium.
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Abstract: | This paper focuses on axially loaded, large-scale rectangular RC columns confined with fiber-reinforced polymer (FRP) wrapping. Experimental tests are conducted to obtain the stress-strain response and ultimate load for three field-size columns having different aspect ratios and/or corner radii. Effective transverse FRP failure strain and the effect of increasing confining action on the stress-strain behavior are examined. Existing strength models, the majority of which were developed for small-scale specimens, are applied to predict the structural response. Since some of them fail to adequately characterize the test data and others are complex and require significant calculation, a simple design-oriented model is developed. The new model is based on the confinement effectiveness coefficient, an aspect ratio coefficient, and a corner radius coefficient. It accurately predicts the axial ultimate strength of the large-scale columns at hand and, when applied to the small-scale columns studied by other investigators, produces reasonable results. |
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Keywords: | Fiber reinforced polymers Columns Axial forces Stress strain relations Composite materials |
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