P	load applied on the beam
$\delta$	midspan displacement of the beam
L	span length
c	neutral axis depth
d′	cover
H	beam section height
bf	width of FRP layer
bw	beam section width
${\epsilon }_{cc}$	concrete compressive strain
${\epsilon }_{sc}$	rebar compressive strain
${\epsilon }_{st}$	rebar tensile strain
${\epsilon }_{ct}$	concrete tensile strain
${\epsilon }_f$	frp strain
${\sigma }_{cc}\left(\epsilon \right)$	concrete compressive stress
${\sigma }_s\left(\epsilon \right)$	rebar stress
${\sigma }_{ct}\left(\epsilon \right)$	concrete tensile stress
${\sigma }_f\left(\epsilon \right)$	FRP stress
M	moment
$\kappa$	curvature
$\rho$	curvature radius
E	elastic modulus
$I_{eff}$	effective moment of inertia
d	effective depth
${\epsilon }_{f,prestress}$	applied strain for prestressing
$f\left(z\right)$	transformed stress function of materials
$F_{cc}\left(z\right)$	force of concrete in compressive zone
$F_{sc}\left(z\right)$	force of rebar in compressive zone
$F_{ct}\left(z\right)$	force of concrete in tension zone
$F_{st}\left(z\right)$	force of rebar in tension zone
$F_f\left(z\right)$	force of FRP
$c_i$	neutral axis depth of i. iteration
x	coefficient of Mander model depending on E and ${\epsilon }_{co}$
r	coefficient of Mander model depending on E and $E_{sec}$
${\epsilon }_{co}$	strain of concrete characteristic strength
${\epsilon }_{cu}$	ultimate strain of concrete in compression
$E_{sec}$	secant modulus of concrete for inelastic region
$f_{cc}$	concrete characteristic compressive strength
$f_{ct}$	concrete characteristic tensile strength
$f_{sy}$	rebar yielding strength
${\epsilon }_{ff}$	FRP ultimate strain
$n$	number of FRP strip
Fa	force of analytical result
Fe	force of experimental result