Af	area of FRP tension reinforcement (mm2)	h1	Distance from neutral axis to center of tensile reinforcement (mm)
		h2	distance from neutral axis to extreme tension fiber (mm)
a	shear span (mm)	Icr	moment of inertia of transformed cracked section (mm4)
BS	bending stiffness of beam	Ie	effective moment of inertia (mm4)
b	effective beam width (mm)	Ig	gross moment of inertia of uncracked section (mm4)
C	spacing or cover dimension. (mm)	kb	bond-dependent coefficient
d	distance from the extreme compression fiber to the centroid of tension force (mm)	Lg	length of the uncracked section (mm)
		Mcr	cracking moment (kN·m)
db	bar diameter (mm)	Mn	nominal moment capacity (mm)
dc	Thickness of concrete cover measured from extreme tension fiber to center of bar or wire location closest thereto (mm)	p	applied load (kN)
		pu	ultimate load (kN)
		s	spacing between the longitudinal reinforcement bars (mm)
Ec	modulus of elasticity of longitudinal reinforcement (MPa)	w	maximum crack width (mm)
Ef	modulus of elasticity of longitudinal reinforcement (MPa)	wcr	Load of test beam when cracking (mm)
fc	cubic compression strength of concrete (MPa)	wmean	Average crack width (mm)
fck	cylindric compressive strength of concrete (MPa)	$\psi$	coefficient of strain inhomogeneity of longitudinal bar
ft	tensile splitting strength of concrete (MPa)	${\sigma }_{fk}$	stress in longitudinal reinforcement bar under specified loads (MPa)
ffu	Design tensile strength of FRP (MPa)
hh	rib height of the bar (mm)	${\tau }_{sf}$	bonding strength of steel and carbon fiber
hs	rib spacing of the bar (mm)	pcr	Load of test beam when cracking (kN)
$\delta$	mid-span deflection (mm)	ρ	Longitudinal reinforcement ratio