Hull Section Modulus

Global Hull Girder Section Modulus and Bending Stress Spreadsheet Units (USCS/SI): Height of Deck:

USCS 24

(USCS, SI) in Green boxes are for data entry!

Plating (Major components) (one-half of ship) Component

hull bottom plate side plate gunwale deck

# of items

Plate wt #

Width

Thickness

Angle

10.2 10.2 40.8 10.2

in 36.00 24.00 2.00 6.00

in 0.2500 0.2500 1.0000 0.2500 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

deg 0.00 90.00 90.00 0.00

1.0 1.0 1.0 1.0

Sum

Total Area (a) in^2 9.0000 6.0000 2.0000 1.5000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 18.5

Height wrt 1st Moment 2nd Moment BL 2 (ah) (ah ) (h) in in^3 in^4 0.13 1 0 12.00 72 864 23.00 46 1058 24.00 36 864 0 0 0 0 0 0 0 0 0 0 0 0 0 0 155.1 2786.1

Local Moment (i) in^4 0 288 1 0 0 0 0 0 0 0 0 288.7

Longitudinals (Small components) (one-half of ship) Component

longitudinal

# of items

Area

Total Area (a)

1.0

in^2 0.75

in^2 0.75

Sum Curved Plating (one-half of ship) Component

chine radius

Half-Ship Values hNA

0.75

# of items

wt #

1.0

10.2

8.0 3076.6 1244.8 1831.8 33%

in^4 in^4 in^4

Full Ship Values Area I Zdeck

37.0 3663.7 228.4

in^2 in^4 in^3

Zkeel

460.2

in^3

Material yield Allowable FOS Material allowable Stillwater deck stress Stillwater bottom stress Hogging deck stress Hogging bottom stress Sagging deck stress Sagging bottom stress

1st Moment (ah) in^3 1 0 0 0 0 0 0 0 0 0 0 1.1

2nd Moment 2 (ah ) in^4 2 0 0 0 0 0 0 0 0 0 0 1.7

Curve Radius

Circle Fraction

Thickness

Total Area (a)

in 1.0

% 25.0

in 0.2500

in^2 0.3927

90 degrees

Height wrt 1st Moment 2nd Moment BL 2 (ah) (ah ) (h) in in^3 in^4 0.3 0 0

11768 5841 17652 8761 20005 9929

psi psi psi psi psi psi

0.4

0.1

0.0

0.0

19.6

156.4

2787.9

288.8

Include dynamic amplification factor, if appropriate

Actual FOS 2.9 5.8 1.9 3.9 1.7 3.4

OK? OK OK FAIL OK FAIL OK

in^4 0

Sum

Notes: Identify whether from ABS, DnV, GHS or hand calcs

34000 psi 2.3 14783 psi

Local Moment (i)

TOTAL SUM

Note: The goal is as close to 50% as is practical.

100 LT-ft 150 LT-ft 170 LT-ft 1

Example: (Baseline at the bottom) gunwale strake 1" x 2" side plating 0.25" x 24" bottom plate 0.25 x 72" longitudinal 0.25" x 3" chine radius 1" for 90 degrees deck 0.25" x 6" 0 degrees

Cl

in

1/2 IZZ 2 A x h NA 1/2 I % ht of NA abv BL

Stillwater Moment Hogging Moment Sagging Moment DAF

Height wrt BL (h) in 1.5