$A_i$	Cross-section area (${\mathrm{m}}^2$)
$E_i$	Young’s modulus (Pa)
$G_i$	Shear modulus (Pa)
$H_i$	Outer height of the beam cross-section $\left(\mathrm{m}\right)$
$h_i$	Inner height of the beam cross-section $\left(\mathrm{m}\right)$
$I_i$	Area moment of inertia (${\mathrm{m}}^4$)
$I_{pi}$	Polar moment of inertia (${\mathrm{m}}^4$)
$i$	Material: steel (1), polymer concrete (2)
$j$	Imaginary unit
$k$	Shear correction factor
$K_i$	Torsional parameter (${\mathrm{m}}^2$)
$L$	Length of a beam $\left(\mathrm{m}\right)$
$w$	Transverse deflection ($\mathrm{m}$)
$\rho$	Mass density $\left[\frac{\mathrm{kg}}{{\mathrm{m}}^3}\right]$