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Axial Response of Concrete-Filled FRP Tube (CFFT) Columns with Internal Bars

Department of Civil Engineering, University of Sherbrooke, Sherbrooke, QC J1K 2R1, Canada
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J. Compos. Sci. 2018, 2(4), 57; https://doi.org/10.3390/jcs2040057
Received: 26 July 2018 / Revised: 31 August 2018 / Accepted: 5 September 2018 / Published: 24 September 2018
(This article belongs to the Special Issue Use of Fiber-Reinforced Polymer Composites in Civil Engineering)
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Abstract

This paper aims at investigating the general axial behavior of long circular concrete-filled, fiber-reinforced polymer (FRP) tube (CFFT) columns internally reinforced with different longitudinal rebars. A total of seven CFFT and three reinforced concrete (RC) columns served as control specimens for comparisons and were constructed and tested under cyclic axial loading until failure. The test parameters were: (1) internal reinforcement type (steel, glass fiber-reinforced polymer (GFRP) or carbon fiber-reinforced polymer (CFRP)) and amount; (2) GFRP tube thicknesses; and (3) nature of loading. All columns had 1900-mm in height and 213-mm in diameter. Examination of the test results has led to a number of significant conclusions in regards to the trend and ultimate condition of the axial stress-strain behavior, mode of failure of tested CFFT columns, and plastic strains. As expected, an increase in the FRP tube thickness (or stiffness) resulted in an increase in the strength and strain enhancement ratios. The validity of the available design provisions for predicting the ultimate load-carrying capacity of tested columns is also highlighted. View Full-Text
Keywords: concrete; concrete-filled, fiber-reinforced polymer (FRP) tube (CFFT); fiber-reinforced polymer (FRP); column; tubes; bars; cyclic; axial compression concrete; concrete-filled, fiber-reinforced polymer (FRP) tube (CFFT); fiber-reinforced polymer (FRP); column; tubes; bars; cyclic; axial compression
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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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Ahmed, A.A.; Masmoudi, R. Axial Response of Concrete-Filled FRP Tube (CFFT) Columns with Internal Bars. J. Compos. Sci. 2018, 2, 57.

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