Deck Strength Calculation Report

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M A R I N E D E S I G N C O N S U L T A N T

Pages

:

8 Kawasan Industri Sekupang Kav No. 3

Date

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14-Jul-16

Batam - Indonesia 29400

Revision

:

P1

DECK STRENGTH

CALCULATION REPORT

CB200-06 (1 VESSEL) 180 M

Calculated by

Approved by

JAMHARI HIDAYAT BIN MUSTOFA

ONGKO ANGGUN PRADEWO, S.T.

STUDENT INTERNSHIP PROGRAM

INSTITUTE TEKNOLOGI SEPULUH NOPEMBER - SURABAYA

2016

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Decks

Owner Project :

Designer :

ASL MARINE PTE LTD MARINE CADCAM PTE LTD

Vessel Name : CB200-06

Ship : 180' x 60' x 12' BARGE

HULL NO. H-1119

PRINCIPAL DIMENSIONS

Length Overall L = 180 feet 54.86 meters

Breadth Overall B = 60 feet 18.288 meters

Depth Overall h = 12 feet 3.657 meters

Deck Loading P = 15 _ton/m2 147090 N/m2

Longitudinal Stiffene s1 = 572 mm 0.572 meters

Transverse Girder s2 = 1524 mm 1.524 meters

Displacement ∆ = 1004.57 ton

Classification = ABS Steel Barges 2015

SEA WATER DENSITY

kg/m3 o C No. 1 2 3 4 5 6

CALCULATE AND DETERMINE

Minimum thickness of plate deck Minimum thickness of plate bottom Minimum thickness of plate side shell Minimum length of longitudinal girder Minimum length of transverse girder Minimum length of stiffener

Sea Water Density = 1.025

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Student Internship Program PT. Marine Cadcam Indonesia

Calculated by Jamhari Hidayat B.M.

No.

DECK PLATING THICKNESS

SOLUTION

a. Strength Deck with Longitudinal Beams and Transverse Beams

Based on 3-2-3/1.1.2(a) and 3-2-3/1.1.2(b), each strength deck plating is to be have thickness not less than obtained from the following equation:

Longitudinal Beams (Stiffener)

t = = = 0.009s + 2.4 mm 0.009(572) + 2.4 mm 7.548 mm , for s ≤ 760 mm and t = = = s(L + 48.76) mm 26L + 8681 572(54.86 + 48.76) mm 26(54.86) + 8681 59270.64 mm 10107.36 , for L ≤ 183 m = 5.864106948 mm

So, the minimum thickness as rule requirement: Transverse Beams (Girder)

7.548 mm t = = = and t = = = = 0.006s + 4.7 mm 0.006(1524) + 4.7 mm 13.844 mm s(L + 48.76) mm 26L + 8681 1524(54.86 + 48.76) mm 26(54.86) + 8681 157916.88 mm 10107.36 15.62394928 mm , for s ≥ 760 mm , for L ≤ 183 m

So, the minimum thickness as rule requirement : 15.624 mm

b. Thickness of Exposed Strength Decks within Line of Openings, Forecastle Decks in Barges of 122 m in Length or Less

Based on 3-2-3/1.1.3, each exposed strength deck plating is to be have thickness not less than obtained from the following equation:

t = 0.01s + 0.9 mm

= 0.01(572) + 0.9 mm

= 6.62 mm

, for s ≤ 760 mm

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Decks c. Thickness of Platform Decks in Enclosed Cargo Spaces

Based on 3-2-3/1.1.4, each platform decks plating is to be have thickness not less than obtained from the following equation:

t = 0.00395s√h + 1.5 mm , for t ≥ 5.0 mm

= 0.00395(572)(√20.804) + 1.5 mm

= 11.80554874 mm

So, the minimum thickness as rule requirement : 11.8 mm

e. Deck Playing at Ends

Based on 3-2-3/1.7, the thickness of plating forward or aft of 0.1L from the ends is not to be less than 0.01 mm for each milimeter of frame spacing (0.01 in for each inch of frame spacing). In way deck cargo, the requirements 3-2-3/1.5 also apply. Exposed freeboard deck plating forward of 0.05L from the forward perpendicular is also not to be less in thickness than given by following equation:

t = 0.03L + 0.0036s + 2.8 mm

= 0.03(54.86) + 0.0036(572) +2.8 mm

= 6.505 mm

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CONCLUSION: NOT PASSED YET

i. Section Modulus of Hull Girder at Amidships

Based on 3-2-1/3.1, the required section modulus SMR amidships, to the deck and bottom is

to be obtained from following equation:

where SMR = K SMb cm2-m K = 0.629 + MS/(fp SMb) ≥ 1.0 = 1 C1 = = = 16.33(L/100)2 - 15.47(L/100) + 7.77 16.33(54.86/100)2 - 15.47(54.86/100) + 7.77 4.197866807 , 45 ≤ L ≤ 95 m C2 = 0.01 ∆ =

So, the minimum section modulus is 223,453,754.20 mm 3

Cb = 1.025 x L x B x h 1004.57 1.025 x 54.86 x 18.288 x 3.657 = 0.267121818 SMb = = 2 C1C2L B(Cb + 0.7) (4.2)(0.01)(54.862)(18.3)(0.27 + 0.7) cm2-m = 2234.537542 cm2-m = 223453.7542 cm3 So, = SMR = K SMb cm2-m = (1)(223453.7542) cm2-m = 223453.7542 cm3 = 223453754 mm3

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Section Modulus of Hull Structures

CONCLUSION: PASSED

ii. Section Modulus of Deck Longitudinals

Based on 3-2-5/3.1.1, the required section modulus for each deck longitudinal, in association with the plating to which it is attached, is not to be less than that obtained from the

following equations: where SM = 7.8chsℓ2 cm3 c = 1.0 h = 0.02L + 0.76 meters = 0.02(54.86) + 0.76 meters = 1.8572 meters ℓ = 6.096 meters So, SM = = 7.8chsℓ2 7.8(1)(1.8572)(0.572)(6.0962) cm3 cm3 = 307.9209395 cm3 = 307920.94 mm3

So, the minimum sections modulus for deck longitudinal as rule requirement is 307,920.94

mm 3

Section Modulus of Deck Longitudinals

with Deck Plating 8 mm

Sec. Modulus Ix = c = 221262165 290.4092 mm4 mm SM = = Ix c 221262165 290.4092 mm3 mm3 = 761897.92 mm3

The minimum section modulus for longitudinal girders of strength decks was 307,920.94

mm 3 , which is lower than 761,897.92 mm 3

--- REGIONS --- Area: 8856.0000 Perimeter: 2180.0000 Bounding box: X: -284.0668 -- 287.9332 Y: -290.4092 -- 127.5908 Centroid: X: 0.0000 Y: 0.0000 Moments of inertia: X: 221262165.0081 Y: 125868376.4264 Product of inertia: XY: -2262205.7453 Radii of gyration: X: 158.0647

Y: 119.2174

Principal moments and X-Y directions about centroid:

I: 221315781.7075 along [0.9997 -0.0237] J: 125814759.7270 along [0.0237 0.9997]

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iii. Section Modulus of Longitudinal Stiffeners

Based on 3-2-5/3.1.1, the required section modulus for longitudinals stiffeners of strength decks and effective lower decks, is not to be less than that obtained from the following equations: where SM = 7.8chsℓ2 cm3 c = 1.0 h = 0.02L + 0.76 meters = 0.02(54.86) + 0.76 meters = 1.8572 meters ℓ = 0.572 meters So, SM = = 7.8chsℓ2 7.8(1)(1.8572)(0.572)(0.5722) cm3 cm3 = 2.71107395 cm3 = 2711.07 mm3

So, the minimum sections modulus for longitudinal stiffener of strength decks and

effective lower decks as rule requirement: 2,711.07 mm 3

Section Modulus of Stiffeners

Sec. Modulus Ix = c = 2808861.789 69.8098 mm4 mm SM = = Ix c 2808861.789 69.8098 mm3 mm3 = 40235.92374 mm3

The minimum section modulus of for longitudinal stiffeners of strength decks was 2711.07

mm 3 , which is lower than 40,235.95 mm 3

--- REGIONS --- Area: 5521.2794 Perimeter: 1389.9655 Bounding box: X: -288.2066 -- 283.7934 Y: -69.8098 -- 13.1902 Centroid: X: 0.0000 Y: 0.0000 Moments of inertia: X: 2808861.7888 Y: 125082004.2985 Product of inertia: XY: 721051.2755 Radii of gyration: X: 22.5551

Y: 150.5142

I: 2804609.8586 along [1.0000 -0.0059] J: 125086256.2286 along [0.0059 1.0000]

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Section Modulus of Hull Structures

iv. Section Modulus of Transverse Girder

Based on 3-2-5/3.3, the required section modulus for each deck transverses, in association with the plating to which it is attached, is not to be less than that obtained from the following equations: where SM = 4.74chsℓ2 cm3 c = 1.0 h = 0.02L + 0.76 meters = 0.02(54.86) + 0.76 meters = 1.8572 meters ℓ = 1.524 meters So, SM = = 7.8chsℓ2 7.8(1)(1.8572)(1.524)(1.5242) cm3 cm3 = 51.2752963 cm3 = 51275.30 mm3

So, the minimum sections modulus for transverse girder of strength decks and effective

lower decks as rule requirement: 51,275.30 mm 3

Effective Width of Plating

The effective width of plating em of frames and girders may be determined according to Table 3.1 (BV Chapter 8.3D/2.1) considering the type of loading.

ℓ = 1524 mm e = 1000 mm ℓ/e = 1.524 from table ℓ/e em1/e 1 2 0.36 0.64 Interpolation 0.52 2 - 1 = x 0.64 - 0.36 x = 0.14672 em1/e = 0.36 + 0.147 = 0.50672 em1 = 0.50672e mm = 506.72 mm

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Calculated by Jamhari Hidayat B.M. Sec. Modulus Ix = c = 202831172 234.219 mm4 mm SM = = Ix c 202831172 234.219 mm3 mm3 = 865989.40 mm3

The minimum section modulus of for longitudinal stiffeners of strength decks was

51,275.30 mm 3 , which is lower than 865,989.4 mm 3

--- REGIONS --- Area: 13800.8000 Perimeter: 1847.4400 Bounding box: X: -256.7102 -- 250.0098 Y: -234.2190 -- 97.7810 Centroid: X: 0.0000 Y: 0.0000 Moments of inertia: X: 202831171.9556 Y: 164326015.9461 Product of inertia: XY: 5086790.0237 Radii of gyration: X: 121.2314

Y: 109.1192

I: 203491835.5899 along [0.9917 0.1288] J: 163665352.3119 along [-0.1288 0.9917]

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