As	Tensile steel area
AF	Tensile FRP area
b	Width of RC slab
c	Distance from extreme compression fiber to the neutral axis
CE	Environmental reduction factor
Cm, Cv	Moment and shear coefficients
d	Distance from the extreme fiber of the compression zone to the center of the steel
df	Distance from the extreme fiber of the compression zone to FRP
Ec	Elastic modulus of concrete
EF	Elastic modulus of CFRP
Es	Elastic modulus of steel
f’c	Compressive strength of concrete
f’H	Compressive strength of the concrete overlay
ffe	Effective stress in FRP
ffu	Design ultimate strength of FRP
${\mathrm{f}}_{\mathrm{fu}}^{*}$	Ultimate tensile strength of FRP material, reported by the manufacture
fs	Stress in tension steel
fy	Yield stress of steel
h	Height of RC slab
Icr	Cracked moment of a section
k	The ratio of the depth of the neutral axis to reinforcement depth measured from extreme compression fiber
l en	Clear span length of the end span
l in	Clear span length of the interior span
n	Number of CFRP layer
Mn	Moment carrying capacity
Mn,Ne, Mn,Pe	Moment carrying capacities of the support and mid-span sections on the end-span
Mn,Ni, Mn,Pi	Moment carrying capacities of the support and mid-span sections on the interior span
Mns	Flexural strength contributed by tensile steel
Mnf	Flexural strength contributed by CFRP
MD,N2e	The moment carrying of the N-2e section
Mu	The factored moment at a section
tF	The thickness of CFRP laminate
tH	The thickness of the concrete overlay
Vn	The shear carrying capacity
Vu	Factored shear at a section
wf	The ultimate failure load
wu	The design factored load
wuM, wuV	Design factored load governed by moment and shear carrying capacities
ϕf, ϕv	Strength reduction factors for the flexural and shear strength
ψ f	Strength reduction factors of FRP
α1, β1	Stress block factors
γc	Unit weight of concrete
εbi	The existing state strain of FRP installation
εcu	The ultimate strain of concrete
εfd	Debonding strain of FRP
εfe	Strain of FRP
εfu	The ultimate strain of FRP
εs	The strain of tensile steel