TY - JOUR
T1 - RC Columns Strengthened with NSM-CFRP Strips and CFRP Wraps under Axial and Uniaxial Bending
T2 - Experimental Investigation and Capacity Models
AU - Abokwiek, Raed
AU - Abdalla, Jamal A.
AU - Hawileh, Rami A.
AU - El Maaddawy, Tamer
N1 - Funding Information:
The support for the research presented in this paper was provided, in part, by Riad Sadek, Endowed Chair in Civil Engineering, and the Faculty Research Grants Program of the American University of Sharjah. The support for publication and dissemination of the results of this study was provided by the Open Access Program of the American University of Sharjah. All support is gratefully appreciated and acknowledged. The views and conclusions in this study, whether expressed or implied, are those of the authors and should not be interpreted as those of the supporting institution.
Publisher Copyright:
© 2021 This work is made available under the terms of the Creative Commons Attribution 4.0 International license,.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - The efficiency of the use of near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips confined with CFRP wraps to strengthen reinforced concrete (RC) columns will be experimentally and analytically investigated in this paper. A total of 15 specimens of RC columns strengthened with different numbers of NSM-CFRP strips (0, 4, and 8) and confined with different numbers of CFRP wraps (0, 2, and 4), will be prepared and tested under concentric and eccentric loading with different eccentricity ratios of 0, 0.25, 0.50, and 0.75, respectively. The axial load capacity, lateral deflection (δ), axial deflection, and longitudinal and transverse strains will be measured. The effects of NSM-CFRP strips, the number of CFRP layers, and the eccentricity ratio on the capacity of the specimen will be investigated. The strengthened specimens showed a significant increase in load-carrying capacity and ductility over the control specimens. The increase in the load-carrying capacity of the confined specimens strengthened with strips in axial and uniaxial bending reached 49% and 95%, respectively, over the control specimen. It was concluded that strengthening RC columns with NSM-CFRP strips wrapped with CFRP composite sheets enhanced both the capacity and ductility consistently, for all applied eccentricity ratios. In addition, an analytical model will be developed to predict the strength of NSM-CFRP-strengthened RC columns and will be validated using the obtained experimental results.
AB - The efficiency of the use of near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips confined with CFRP wraps to strengthen reinforced concrete (RC) columns will be experimentally and analytically investigated in this paper. A total of 15 specimens of RC columns strengthened with different numbers of NSM-CFRP strips (0, 4, and 8) and confined with different numbers of CFRP wraps (0, 2, and 4), will be prepared and tested under concentric and eccentric loading with different eccentricity ratios of 0, 0.25, 0.50, and 0.75, respectively. The axial load capacity, lateral deflection (δ), axial deflection, and longitudinal and transverse strains will be measured. The effects of NSM-CFRP strips, the number of CFRP layers, and the eccentricity ratio on the capacity of the specimen will be investigated. The strengthened specimens showed a significant increase in load-carrying capacity and ductility over the control specimens. The increase in the load-carrying capacity of the confined specimens strengthened with strips in axial and uniaxial bending reached 49% and 95%, respectively, over the control specimen. It was concluded that strengthening RC columns with NSM-CFRP strips wrapped with CFRP composite sheets enhanced both the capacity and ductility consistently, for all applied eccentricity ratios. In addition, an analytical model will be developed to predict the strength of NSM-CFRP-strengthened RC columns and will be validated using the obtained experimental results.
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U2 - 10.1061/(ASCE)CC.1943-5614.0001117
DO - 10.1061/(ASCE)CC.1943-5614.0001117
M3 - Article
AN - SCOPUS:85100564860
SN - 1090-0268
VL - 25
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
IS - 2
M1 - 04021009
ER -