Civil Engineering and Architecture Vol. 12(1), pp. 26 - 48
DOI: 10.13189/cea.2024.120103
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Strengthening Reinforced Concrete Rectangular Columns with Various Slenderness Ratios by Fiber Reinforced Polymer (FRP)


Ehab M. Lotfy , Mennatalla Einar *, Erfan Abdel Latif Erfan Heneidy
Department of Civil Engineering, University of Suez Canal, Egypt

ABSTRACT

This paper studied the reinforced concrete (RC) slender columns with rectangular sections behavior when strengthened by carbon fiber reinforced polymers (CFRPs) and exposed to eccentric loads. Nine specimens with a rectangular slender cross-section (210x150mm) were tested with lengths of 3000mm (λ= 70), 2500mm (λ= 58), and 2000mm (λ= 46). Samples were fabricated as slender columns using two strategies. The first strategy is CFRP strengthening with near-surface mounted longitudinally (L-NSM) CFRP strips. The second strategy is composed of a new method where longitudinal near surface mounted (L-NSM) CFRP strips is retrofitted with transverse CFRP sheet wrapping. And the results were used to explore the impact of CFRP retrofitting techniques on the columns. A numerical investigation was performed to examine further key variables' effects on RC columns, demonstrating acceptable outcome with the experimental findings. For all tests, specimens were loaded under compressive axial static. The compression force was applied at an initial eccentricity of 35 mm. Moreover, based on the experimental results of the current investigation, the validated models were used in a comprehensive parametric study comprising fifteen new analytical models to check the effects of key variables expected to impact the behavior of NSM and CFRP-confined RC columns. The key conclusions the study provided are that CFRP retrofitting techniques can enhance axial and flexural rigidity and improve the RC columns performance. Additionally, the study revealed that different retrofitting techniques had different impacts on the RC columns behavior, depending on the slender.

KEYWORDS
Nonlinear Finite Element Analysis, Failure Modes, Slenderness Ratios, Long RC Columns of Rectangular Cross-Section, Compressive Eccentric Loading Tests

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Ehab M. Lotfy , Mennatalla Einar , Erfan Abdel Latif Erfan Heneidy , "Strengthening Reinforced Concrete Rectangular Columns with Various Slenderness Ratios by Fiber Reinforced Polymer (FRP)," Civil Engineering and Architecture, Vol. 12, No. 1, pp. 26 - 48, 2024. DOI: 10.13189/cea.2024.120103.

(b). APA Format:
Ehab M. Lotfy , Mennatalla Einar , Erfan Abdel Latif Erfan Heneidy (2024). Strengthening Reinforced Concrete Rectangular Columns with Various Slenderness Ratios by Fiber Reinforced Polymer (FRP). Civil Engineering and Architecture, 12(1), 26 - 48. DOI: 10.13189/cea.2024.120103.