A — Sectional area
G — Mass per meter
Iy — Moment of inertia about the main neutral axis y-y
Wel,y — Elastic section modulus
rg — Radius of gyration about the y-y axis
AL — Coating area, one side only, excluding inside of interlocks
S — Single pile, considered neutral axis y'-y'
D — Double pile/wall, considered neutral axis y-y
T — Triple pile, considered neutral axis y"-y"