Abstract
PurposeAdvanced fibre-reinforced polymer (FRP) composites have been increasingly used over the past two decades for strengthening, upgrading and restoring degraded civil engineering infrastructure. Substantial experimental investigations have been conducted in recent years to understand the compressive behaviour of FRP-confined concrete columns. A considerable number of confinement models to predict the compressive behaviour of FRP-strengthened concrete columns have been developed from the results of these experimental investigations. The purpose of this paper is to present a comprehensive review of experimental investigations and theoretical models of circular and non-circular concrete columns confined with FRP reinforcement.Design/methodology/approachThe paper reviews previous experimental test results on circular and non-circular concrete columns confined with FRP reinforcement under concentric and eccentric loading conditions and highlights the behaviour and mechanics of FRP confinement in these columns. The paper also reviews existing confinement models for concrete columns confined with FRP composites in both circular and non-circular sections.FindingsThis paper demonstrates that the performance and effectiveness of FRP confinement in concrete columns have been extensively investigated and proven effective in enhancing the structural performance and ductility of strengthened columns. The strength and ductility enhancement depend on the number of FRP layers, concrete compressive strength, corner radius for non-circular columns and intensity of load eccentricity for eccentrically loaded columns. The impact of existing theoretical models and directions for future research are also presented.Originality/valuePotential researchers will gain insight into existing experimental and theoretical studies and future research directions.
Highlights
Over the last three decades, the application of advanced composite materials as external reinforcement for strengthening and retrofitting existing civil engineering infrastructure has received significant research attention
The results showed that the glass fibre reinforced polymer (GFRP) confinement in the non-circular section was insufficient in restraining the concrete in the core compared to the uniformly confined
The findings show that GFRP laminates, when used as external reinforcement to concrete cylinders, could enhance the axial and lateral strength of concrete cylinders up to 110% and provide ductility enhancement
Summary
Over the last three decades, the application of advanced composite materials as external reinforcement for strengthening and retrofitting existing civil engineering infrastructure has received significant research attention. Their study indicated that steel jacketing could convert splitting bond failure to pull-out bond failure as well as enhancing concrete bond strength They found that the steel jackets can delay yielding of longitudinal steel reinforcement, preventing spalling of concrete, which resulted in increased ultimate drift and displacement ductility of the confined RC columns. Regardless of their significant advantages in regard to strength and ductility enhancement, these jacketing systems have some inherent shortcomings, including that they are labour intensive and time-consuming and could possibly increase the cross-sectional area of structural members. The paper reviews stress-strain models that have been proposed to predict the strength and axial strain of concrete columns confined by FRP composites in circular and non-circular cross-sections
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