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Computers and Concrete Volume 38, Number 3, September 2026 , pages 551-579 DOI: https://doi.org/10.12989/cac.2026.38.3.07 |
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Performance evaluation of NSC and HSC columns reinforced with FRP bars |
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İsmet Vapur, İlker F. Kara, Ashraf F. Ashour
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| Abstract | ||
| This paper presents analytical and numerical approaches for predicting the interaction diagrams of the axial load-bending moment (P-M) and the moment-curvature (M-Psi) behaviour of reinforced concrete columns (RCC) reinforced with fiber-reinforced polymers (FRP) bars. The proposed models are based on strain compatibility and internal force equilibrium and were validated against 95 full-scale FRP bar RCC (FRP-RCC) available in the literature. A comprehensive parametric study was conducted to examine the influence of concrete compressive strength (fc'), the type and longitudinal reinforcement ratio of FRP bars (rhof), and the column slenderness ratio (kl/r) on the P-M interaction and the M-Psi relationship of FRP-RCC. The enhancement in axial load carrying capacity of carbon fiber reinforced polymer (CFRP) RCC and glass fiber reinforced polymer (GFRP) RCC, resulting from an increased rhof, was observed to be more significant in normal strength concrete (NSC) columns compared to high strength concrete (HSC) columns. However, when the axial load eccentricity increased, the enhancement in axial resistance of NSC columns (NSCC) and HSC columns (HSCC) due to an increase in rhof became approximately similar. Furthermore, considering the moment-curvature (M-Psi) relationship, increasing both the concrete compressive strength and FRP reinforcement ratio enhanced the flexural capacity and bending stiffness of RCC. Additionally, it was concluded that increasing rhof substantially increased the bending stiffness of RCC, particularly under moderate eccentricity. | ||
| Key Words | ||
| FRP bar; high strength concrete columns; interaction diagram; moment-curvature relationship; normal strength concrete columns | ||
| Address | ||
| İsmet Vapur, İlker F. Kara: Department of Civil Engineering, Mersin University, Mersin, 33110, Türkiye Ashraf F. Ashour: Faculty of Engineering and Digital Technologies, University of Bradford, Bradford, UK | ||