${\sigma }_{\mathrm{s}}$	Reinforcement stress (MPa)
$E_{\mathrm{s}}$	Elastic modulus of steel bar (MPa)
x c	Height of the compression zone (mm)
x e	Height of the elastic part of the tension zone (mm)
x p	Height of the elastic part of the plastic part (mm)
μ	Ratio of the height of the plastic zone to the height of the tension zone, μ = xp/(h − xc);
${\epsilon }_{\mathrm{frc}}$	Ultimate compressive strain of SFRAC (με)
${\sigma }_{\mathrm{frc}}$	Ultimate compressive stress of SFRAC (με)
${\epsilon }_{\mathrm{frt}0}$	Peak tensile strain (με)
${\epsilon }_{\mathrm{frtu}}$	Ultimate tensile strain of SFRAC (με)
D	Resultant force of the compression zone (N)
T e	Resultant force of the elastic zone in the tension zone. (N)
T p	Resultant force of the plastic region zone in the tensile region (N)
T s	Resultant force of the longitudinal tensile bar (N)
${\delta }_{\mathrm{R}}$	Recycled Aggregate Replacement Rate
${\lambda }_{\mathrm{f}}$	Steel Fiber Volume Fraction
f frt	Tensile strength of SFRAC (N)
f y	Designed strength of the steel bar (MPa)
f t	Tensile strength of ordinary concrete with the same SFRAC strength grade (MPa)
W fr0	Resistance moment of the converted section after the longitudinal tensile reinforcement is converted into the SFRAC area.
b	Width of the beam section (mm)
h	Height of the beam section (mm)
h 0	Effective height of the beam section (mm)
${\alpha }_{\mathrm{E}}$	Ratio of the elastic modulus of the longitudinal tensile steel bar to the SFRAC elastic modulus
${\gamma }_{\mathrm{frm}}^{\exp }$	Measured value of the resistance moment plastic influence coefficient of the SFRAC section
$M_{\mathrm{frcr}}^{\exp }$	Measured cracking moment (kN·m)
$M_{\mathrm{frcr}}^{\mathrm{c}}$	Calculation value of cracking moment (kN·m)
M frcr	Cracking moment of the SFRAC beam (kN·m)
${\gamma }_{\mathrm{frm}}^{}$	Resistance moment plastic influence coefficient of the SFRAC section
W fr0	Resistance moment of the converted section after the longitudinal tensile reinforcement is converted into the SFRAC area (mm3)
W frc	Elastoplastic resistance moment of the section of the SFRAC beam to the tension zone edge of the section considering the plastic deformation (mm3)
$M_{\mathrm{a}}$	Ultimate bending moment of SFRAC beam is calculated according to ACI 544.4 R-88
$M_{\mathrm{u}}$	Ultimate bending moment of SFRAC beam is calculated according to ACI 318-2014
d	Distance from extreme compression fiber to centroid oftension reinforcement (mm)
a	Depth of rectangular stress block b =width of beam (mm)
c	Distance from extreme compression fiber to neutral axis found byequating the internal tension (mm)
e	Distance from extreme compression fiber to top of tensile stress block of fibrous concrete (mm)
$f_{\mathrm{c}}^{\prime }$	Compressive strength of concrete (MPa)
${\sigma }_{\mathrm{t}}$	Tensile stress in fibrous concrete (MPa)
$F_{\mathrm{be}}$	Bond efficiency of the fiber
${\epsilon }_{\mathrm{f}}$	Tensile strain in steel fiber at theoretical moment strength of beam
$M_{{}_{\mathrm{u}}}^{\mathrm{c}}$	Theoretically calculated value of the ultimate bending moment (kN·m)
$M_{{}_{\mathrm{u}}}^{\exp }$	Measured value of the ultimate bearing capacity (kN·m)
As	Section area of the longitudinal tensile bar (mm2)
$V_{\mathrm{f}}$	Percent by volume of steel fibers