$b$&$h$	width and depth of rectangular cross section, respectively (mm)
$D$	equivalent diameter of rectangular section (mm)
$r_c$	corner radius (mm)
$A_g$	area of rectangular cross section with rounded corners (mm2)
$H_c$	clear height of column between end corbels
$n_f$	total number of layers of full FRP wraps
$N_s$	total number of layers of partial FRP wraps
$t_f$	thickness of one FRP layer (mm)
$w_f$	width of FRP strip (mm)
$s_f$	center-to-center spacing of FRP strips (mm)
$E_f$	elastic modulus of elasticity of FRP (MPa)
$f_f$	tensile strength of FRP (MPa)
${\rho }_f$	volumetric ratio of FRP wraps
$k_{ef}$	coefficient for effectiveness of FRP wraps
$k_{es}$	coefficient for effectiveness of internal steel ties
$k_{\epsilon h}$	strain efficiency factor of lateral FRP wraps
$k_{\epsilon v}$	strain efficiency factor of longitudinal FRP
${\epsilon }_{fe}$	effective tensile strain of FRP at rupture
${\epsilon }_{fu}$	ultimate tensile strain of FRP at rupture
$f_{yh}$	yield strength of hoop steel bars (MPa)
$f_{yl}$	yield strength of longitudinal steel bars (MPa)
$f_c^{\prime }$	strength of unconfined concrete 150 mm × 300 mm cylinders (MPa)
$f_{cd}^{\prime }$	strength of unconfined concrete 100 mm × 200 mm cylinders (MPa)
$f_{cu}^{\prime }$	strength of unconfined concrete 150 mm × 150 mm cubes (MPa)
${\epsilon }_{co}$	unconfined concrete strain (mm/mm)
$k_{sf}$	shape factor to account for a rectangular cross section with rounded corners
$AAE$	average absolute error
$MSE$	mean square error
$SD$	standard deviation
$R_{sh}$	proposed confinement stiffness ratio of FRP in hoop axis
$R_{sv}$	proposed confinement stiffness ratio of FRP in vertical axis
$c_x$&$c_y$	concrete core dimensions to the center line of the hoops along x and y directions (mm)
${\rho }_{cc}$	ratio of longitudinal reinforcement area divided by concrete core area
$A_{shx}$&$A_{shy}$	cross-sectional areas of hoop reinforcement along x and y directions (mm2)
${\rho }_{sx}$&${\rho }_{sy}$	volumetric ratios of hoop reinforcement in x and y directions
${\rho }_{eh}$	effective volumetric ratio of steel ties
$w_{xi}$&$w_{yi}$	clear distances between longitudinal bars along x and y directions (mm)
$s^{\prime }$	vertical clear spacing between steel ties (mm)
$s$	center-to-center spacing between steel ties (mm)
${\rho }_s$	ratio of longitudinal steel reinforcement
$A_s$	total area of longitudinal steel reinforcement (mm2)
$n$	total number of tested specimens
$\alpha$	coefficient to account for the unconfined concrete strength effect
$\gamma$	coefficient to account for the effect of increased eccentricity ratio
$N_{uo}$	axial loading capacity of columns (KN)
$P_{uc}$	peak axial load of unwrapped RC columns (KN)
$P_{cc}$	peak axial load of FRP-wrapped columns (KN)
$P_{uc}^u$	failure axial load of unwrapped columns (KN)
$P_{cc}^u$	failure axial load of FRP-wrapped columns (KN)
$P_c$	axial load of concrete cylinder (KN)
$k_{se}$	proposed coefficient to account for the effect of FRP wrapping schemes