Redukovaný průřezový modul

S_{y} = \frac{(b - 2 \cdot a_{eff}) \cdot {(d - a_{eff})}^{2}}{6}

S_{y} = \frac{(6.75 in - 2 \cdot 1.8 in) \cdot {(13.5 in - 1.8 in)}^{2}}{6}

S_{y} = \frac{3.15 in \cdot {(11.7 in)}^{2}}{6}

S_{y} = 71.9 {in}^{3}

S_y	Section modulus
b	Width
d	Depth
a_eff	Effective char depth = 1.2a_char= 1.2β_tt^0.813= 1.21.5*1^0.813