a/d	Shear span-to-effective depth ratio
Afv	Cross-sectional area of FRP transverse reinforcement
bw	Beam web width
CFRP	Carbon Fiber-Reinforced Polymer
CNR-DT 203-06	Italian National Research Council Guideline for FRP Reinforcement
CSA S806-12	Canadian Standard for Design and Construction of Building Structures with FRP
COV	Coefficient of Variation
d	Effective depth of beam
dv	Effective shear depth
DFb	Deformability factor of beams
Eb	Energy absorption capacity of beam
Ec	Modulus of elasticity of concrete
Ef	Modulus of elasticity of longitudinal FRP reinforcement
Efv	Modulus of elasticity of FRP stirrup
Es	Modulus of elasticity of steel
fc	Compressive strength of concrete
ffuv	Ultimate tensile strength of FRP stirrup
ffv	Stress in FRP transverse reinforcement
FRP	Fiber-Reinforced Polymer
GFRP	Glass Fiber-Reinforced Polymer
GRNN	Generalized Regression Neural Network
h	Total height of beam
ISIS-M03-07	ISIS Canada Design Manual No. 3 for FRP Reinforcement
ka	Arch action factor
kd	Neutral axis depth ratio (ACI)/size effect factor (CNR)
km	Moment-shear interaction factor
kr	Longitudinal reinforcement stiffness factor
ks	Size effect factor
Mf	Factored bending moment
nf	Modular ratio (Ef/Ec)
Pb	Ultimate load capacity
RC	Reinforced Concrete
s	Stirrup spacing
STD	Standard Deviation
Vc	Concrete contribution to shear strength
Vc,act	Actual concrete shear contribution
Vc,p	Predicted concrete shear contribution
Vexp	Experimental shear strength
Vf,act	Actual shear force resisted by FRP stirrups
Vfrp	FRP stirrup contribution to shear strength
Vn	Nominal shear strength (Vc + Vfrp)
θ	Inclination angle of main shear crack
ρf	Longitudinal reinforcement ratio
ρfb	Balanced reinforcement ratio
σN	Axial normal stress
ε1	Longitudinal reinforcement strain
εfv,n	Nominal strain of FRP stirrup
ϕc	Concrete resistance factor
ϕf	FRP resistance factor
γk	Model Precision Coefficient