SCANTLING CALCULATION

REFERENCE: PHILIPPINE REGISTER OF SHIPPING

NAME OF VESSEL: ALPHA TANGO

PARTICULARS:

LOA = 29.27 m
LBP = 26.79 m
MB = 8.23 m
MD = 3.78 m
DRAFT = 2.89 m
FRAME SPACING (CHAPTER E 7.01)

S = 2 x L + 480 mm
= 2 x 20.49 + 480
= 521 mm adopt 609mm

PLATE KEEL (CHATER E SECTION 3.01b)

b = 900 + 3.5 L mm
= 900 + 3.5 x 20.5
= 972 mm

t = 0.1 L + 5 mm L < 90m

= 0.1 x 20.5 + 5
= 7.05 mm adopt 9mm

BOTTOM SHELL PLATING ( for transverse bottom framing )

t = 0.006 S √ d + 2 L < 60m

= 0.006 x 609 √ 2.2 + 2
= 3.837 x 2.049
= 7.863 mm adopt 8mm

SIDE SHELL PLATING ( for transeverse framing) (CHAPTER E SECTION 3)

t = 0.006 S √ d + 2 mm
= 0.006 x 609 √ 2.2 + 2
= 3.593 x 2.049
= 7.364 mm adopt 8mm

DECK PLATES ( for transeverse framing) (CHATER E 4.02)

t = 0.05 L + 5 mm
= 0.05 x 20.5 + 5
= 6.025 mm adopt 8mm

STRINGER SHELL PLATING ( for transeverse framing)

b = 6.8 L + 500 mm
= 6.8 x 20.5 + 500
= 639.4 mm

STEM (CHAPTER E 13.02)

t = 0.1 L + 5 mm
= 0.1 x 20.5 + 5
= 7.05 mm adopt 12mm
PLANE BULKHEAD PLATING (CHAPTER E 11.09)

t = 3.2 S √ h + 2.3 mm
= 3.2 x 0.5 √ 2.90 + 2.3
= 1.6 x 1.703 + 2.3
= 5.025 mm adopt 7mm

CENTER GIRDERS (CHAPTER E 6.09a)

t = 0.065 L + 5.5 mm FOR L<90mm

= 0.065 x 20.5 + 5.5
= 6.833 mm adopt 8mm

BULWARKS (CHAPTER J 1.17)

t = 5 mm FOR L ≤ 30mm
= 7 mm FOR L ≥ 30mm
DECK GIRDERS (CHAPTER E 8.07)

c = 7.14 - 0.018 L
= 7.14 - 0.018 x 20.5
= 6.771

SM = cbhl2
= 6.771 x 1.5 x 2.9 x ( 2.075 )2
= 29.45 x 4.306
= 127 cm3

CENTER GIRDERS (CHAPTER E 6.08)

h = L + 42 d + 530 mm FOR L < 90m

= 20.5 + 42 x 2.2 + 530
= 642.9 mm

BULKHEAD STIFFENER (CHAPTER E 11.14)

SM = Cshl2
= 2.5 x 0.5 x 1.45 x ( 2.9 )2
= 1.813 x 8.41
= 15.24 cm3

BOTTOM CENTER GIRDER (CHAPTER E 6.13)

SM = 22sdl2
= 22 x 0.5 x 2.2 x ( 2.9 )2
= 24.2 x 8.41
= 204 cm3

DECK INTERCOSTAL

SM = Cshl2
= 8.561 x 0.5 x 0.09 x ( 0.5 )2
= 0.385 x 0.25
= 0.096 cm3

C = kL+b
= 0.061 x 20.5 + 7.31
= 8.561
BOTTOM INTERCOSTAL (CHAPTER E 6.33)

SM = 11.5Csdl2
= 11.5 x 0.5 x 2.2 x ( 0.5 )2
= 12.65 x 0.25
= 3.163 cm3

SIDE FRAMES (CHAPTER E 7.03)

SM = CC1sdl2
= 4.785 x 1.042 x 0.5 x 2.2 x ( 1.5 )2
= 5.486 x 2.25
= 12.34 cm3

2+d/Dx0.65
C =
1.45-√D/l
2 + 2.2 / 2.9 x 0.65
=
1.45 - √ 2.9 / 1.73
2.228
=
0.466
= 4.785

C1 = 1.08 - 0.01 D
= 1.08 - 0.01 x 3.78
= 1.042

SIDE STRINGER (CHAPTER F 7.07)

SM = 13b(h+1.2)l2
= 13 x 1.5 x ( 0.99 + 1.2 ) x ( 1.2 )2
= 19.5 x 2.19 x 1.44
= 61.5 cm3

BOTTOM SIDE GIRDER

SM = 3.8bDl2
= 3.8 x 7.31 x 2.9 x ( 2.075 )2
= 80.56 x 4.306
= 347 cm3
DECK GIRDER SM req'd 126.8172 cm3 wf
tf
MEMBERS h w t UNIT
PLATE 50.3 0.8 cm hw
WEB 20 0.8 cm
FLANGE 7.5 0.8 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
40.24 0.4 16.096 2.146133 4.85796 951.8011
16 10.8 172.8 533.3333 -5.54204 1024.761
6.7 21.2 142.04 0.285867 -15.942 1703.082
62.94 330.936 3679.643

= MOMENT / AREA
330.936
y bar =
62.94
= 5.25796

= d(ad) + I / y bar
3679.643 0.4
SM =
15.54204
= 236.7542

DECK INTERCOSTAL SM req'd 0.096306 cm3

MEMBERS h w t UNIT
hw
PLATE 50 1 cm
WEB 7.5 0.8 cm
FLANGE 0 0 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
50 0.4 20 4.166667 0.358929 10.60815
6 3.75 22.5 28.125 -2.99107 81.80405
0 0 0 0 0.758929 0
56 42.5 92.4122

= MOMENT / AREA
42.5
y bar =
56
= 0.758929

= d(ad) + I / y bar
92.4122
SM =
8.3
 SM

= 11.134

BOTTOM GIRDER SM req'd 203.522 cm3 wf

tf
MEMBERS h w t UNIT
PLATE 182.88 0.9 cm hw
WEB 20 0.8 cm
FLANGE 10 0.8 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
164.592 0.4 65.8368 11.10996 1.865621 583.9795
16 10.8 172.8 533.3333 -8.53438 1698.703
9.2 20.8 191.36 0.392533 -18.5344 3160.806
189.792 429.9968 5443.489

= MOMENT / AREA
429.9968
y bar =
189.792
= 2.265621

= d(ad) + I / y bar
5443.489
SM =
18.53438
= 293.6968

BTM INTERCOSTAL SM req'd 3.1625 cm3

MEMBERS h w t UNIT
hw
PLATE 50 0.9 cm
WEB 7.5 0.8 cm
FLANGE 0 0 0 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
45 0.4 18 3.0375 0.394118 10.02729
6 3.75 22.5 28.125 -2.95588 80.54844
0 0 0 0 0 0
51 40.5 90.57574

= MOMENT / AREA
40.5
y bar =
51
= 0.794118

= d(ad) + I / y bar

SM
 90.57574
SM =
7.505882
= 12.0673
BHD STIFFENER SM req'd 15.24313 cm3 wf
tf
MEMBERS h w t UNIT
PLATE 0.5 0.8 cm hw
WEB 7.62 0.8 cm
FLANGE 7.62 0.8 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
0.4 0.4 0.16 0.021333 5.616347 12.63868
6.096 3.83 23.34768 29.49672 2.186347 58.63629
6.82 8.3 56.606 0.290987 -2.283653 35.85776
13.316 80.11368 107.1327

= MOMENT / AREA
80.11368
y bar =
13.316
= 6.016347

= d(ad) + I / y bar
107.1327
SM =
2.283653
= 46.91288

SIDE FRAME SM req'd 12.34274 cm3

MEMBERS h w t UNIT
hw
PLATE 50 0.8 cm
WEB 7.5 0.8 cm
FLANGE 7.5 0.8 cm tp
wp
AREA LEVER MOMENT INA d d(ad) + i
40 0.4 16 2.133333 1.298077 69.53348
6 3.75 22.5 28.125 -2.051923 53.38733
6 8.3 49.8 0 -6.601923 261.5123
52 88.3 384.4331

= MOMENT / AREA
88.3
y bar =
52
= 1.698077

= d(ad) + I / y bar
384.4331
SM =
6.601923
SM

= 58.23048
 HULL GIRDER STRENGTH
MEMBERS SCANTLING NO. A(cm2) Y(m) AY(cm.m) AY^2 H I
DK PLATE 4.15mx8mm 1 33.200 2.900 96.280 279.212 4.120 46.963
DK GIRDER 200mmx100mmx8mm 1 16.000 2.750 44.000 121.000 0.250 0.083
DK INTERCOSTAL 100mmx8mm 6 36.000 2.800 100.800 282.240 0.750 1.688

SIDE PLATE 1.525mx9mm 1 12.200 1.525 18.605 28.373 1.890 3.632

BTM PLATE 3.655mx9mm 1 33.200 0.040 1.328 0.053 4.240 49.738

BTM INTERCOSTAL 75mmx8mm 6 36.000 0.190 6.840 1.300 0.150 0.067

BTM GIRDER 200mmx100mmx8mm 1 16.000 0.020 0.320 0.006 0.350 0.163

WTBHD 2.9mx8mm 1 24.400 1.525 37.210 56.745 3.780 29.053

BHD STIFFENER 75mmx75mmx8mm 1 12.000 1.452 17.419 25.286 0.075 0.006
75mmx75mmx8mm 1 12.000 1.372 16.462 22.582 0.075 0.006
75mmx75mmx8mm 1 12.000 1.293 15.520 20.071 0.075 0.006
75mmx75mmx8mm 1 12.000 1.054 12.653 13.341 0.075 0.006
75mmx75mmx8mm 1 12.000 0.971 11.646 11.302 0.075 0.006
75mmx75mmx8mm 1 12.000 0.814 9.767 7.949 0.075 0.006

CTR BHD 2.9mx8mm 1 24.400 1.525 37.210 56.745 3.780 29.053

CTR BHD STIFFENER 75mmx75mmx8mm 2 24.000 1.984 47.626 94.508 0.075 0.011
75mmx75mmx8mm 2 24.000 1.984 47.626 94.508 0.075 0.011
75mmx75mmx8mm 2 24.000 1.984 47.626 94.508 0.075 0.011
75mmx75mmx8mm 2 24.000 1.984 47.626 94.508 0.075 0.011
75mmx75mmx8mm 2 24.000 1.984 47.626 94.508 0.075 0.011

SIDE BHD 2.9mx8mm 1 24.400 1.525 37.210 56.745 3.780 29.053

75mmx75mmx8mm 1 12.000 1.452 17.424 25.300 0.075 0.006
75mmx75mmx8mm 1 12.000 1.340 16.085 21.560 0.075 0.006
75mmx75mmx8mm 1 12.000 1.225 14.700 18.008 0.075 0.006
75mmx75mmx8mm 1 12.000 1.112 13.343 14.836 0.075 0.006
75mmx75mmx8mm 1 12.000 1.011 12.126 12.253 0.075 0.006
75mmx75mmx8mm 1 12.000 0.930 11.159 10.377 0.075 0.006

TANKTOP 3.02mx8mm 1 24.16 1.40 33.824 47.354 3.02 18.362

INNER BTM LONGL 75mmx75mmx8mm 4 48.000 1.365 65.530 89.461 0.075 0.023
STRUT 75mmx75mmx8mm 5 60.000 0.881 52.830 46.517 0.075 0.028

MEMBERS TOTAL = 651.96 938.417 1741.16 27.535

SM= (C1)(C2)(L²)(B)(Cb + 0.7 ) DG=M/A
C1 = 15.2-0.22L 11 938.417 cm²m
=
C2 = 0.01 651.96 cm² Y=H-DG
L= 20.5 m = 1.43938 cm.m = 1.46
B= 8.3 m DGxM 1350.74 cm² m²
Cb= 0.44 I=M-DG = 1741.16 - 1350.74
I = 390.42 cm² m²
425.07774795 cm² m REQUIRED 780.84 cm² m² More than required.
 SM=I / Y
534.594 cm² m More than required.