CALCULATION FOR MOMENT OF INERTIAL OF STIFFENER

1308

130 8

68

SHELLcorroded thkickness 6

200

section Area Y AY H H2 AH2 Ig1 1200 3 3600 65 4225 5070000 36002 1040 71 73840 3 9 9360 1464666.73 1040 140 145600 72 5184 5391360 5546.6667

Total = 3280 223040 10470720 1473813.3

Neutral Axis = 68

Moment of Inertia, I = 11944533 mm4

Section modulus, Z = 157164.9 mm3 157.1649 cm3

Section modulus is from wind direction. So y value is 144 - 68 = 76