Abstract
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Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted
significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to
corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and
the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection
criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been
compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual
confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive
strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design
oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT
columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute
Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD)
as compared to other available strength and strain enhancement ratios of circular CFFT column models. The
predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength
and strain enhancement ratios investigation results in the compiled database.