$A_{comp-h}$	Compression area of hollow section	fsu	Steel ultimate stress
$A_{comp-s}$	Compression area of beam solid section	fsy	Steel yield stress
$A_h$	Area of opening	H	Beam height
$A_{st}$	Area of tension steel	h1	Opening height of longitudinal opening
$A_t$	Area of uncracked transformed section	h2	Opening height of near the beam center
$A_{t-h}$	Net area of hollow section	h3	Opening height located near the support
$A_{t-s}$	Solid section of the beam	Ieff	Effective moment of inertia
B	Beam width	Ig	Gross moment of inertia
b1	Width of longitudinal opening	Iucr	Moment of inertia of uncracked section
b2	Width of near the beam center opening	$I_{ucr-s}$	Solid transformed moment of inertia of the beam section
b3	Width of near the support opening	L	Beam length
c	Height of the compression zone	$M_{cr}$	Cracking bending moment
$c\prime$	Distance between opening center and top concrete	m	Modular ratio
Es	Modulus of elasticity value of steel	P	The central applied load
fcr	Modulus of rupture value of concrete	Pcr	Beam critical load
fsu	Steel ultimate stress	Pu	Beam ultimate load
${\delta }_{y-h}$	Post-cracking deflection	Py	Yield load of solid section
${\delta }_{pcr}$	Central deflection at pre-cracking stage