Recent Development of Floating Structures

in Japan by use of Rubber Fenders for

Mooring 　　 7th February 2012

Shigeru UEDAS. 　 UEDA　 　

Design of Mooring System

Methods of Mooring System1) Chain, Cable ， Anchor ， Sinker2) Tension Leg3) Dolphin and Rubber Fenders4) Jacket ， Pile and Rubber Fenders

External Forces1) Wind2) Waves, Wave Drift Force3) Current4) Seismic load

Motions and Mooring Forces are calculated by Numerical Simulation

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c) Dolphin and Fenders

b) Tension Legs

d) J acket, Pile and Fenders

a) Chain, Cable and Anchor, Sinker

Station Keeping Systems　 of Floating Structure

c) Dolphin and Fendersc) Dolphin and Fenders

b) Tension Legsb) Tension Legs

d) J acket, Pile and Fendersd) J acket, Pile and Fenders

a) Chain, Cable and Anchor, Sinkera) Chain, Cable and Anchor, Sinker

Station Keeping Systems　 of Floating Structure

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Lacey Murrow Bridge

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Food 　 Canal

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Bergsoysund Bridge

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Nordhordland Bridge

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Rubber Fender

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National Oil Stockpiling Kamigoto Base

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Kamigotou oil strageL 390mB 97mD 27.6mFenderC3000X8C2250X4

Shirashima oil strageL 39７mB 82mD 25.4mFenderC2500X16

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Yume Mai BridgeL 410mB 33.8m

FenderSUC2500X24

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Design of ConnectionFinger Joint

Modular JointRubber Joint

Rolling Leaf Joint

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Final Unit Jointed 1999

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Mega Float 　Ph-1 　１９９５－１９９７　　300m×60m×2mPh-2 　１９９８－２０００　1000m×121m× ３ m

Phase-2

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Pavement

Fender

Steel J acket

Steel Pipe Pile

Fig. 5.4 Jacket Type Dolphin and Fender System

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Figure 3 Load-Deflection Characteristics of Rubber Fender

0

100

200

300

400

500

600

0 10 20 30 40 50Compression Strain（％ ）

Rea

ctio

n Fo

rce

N)

（ｋ

SUC1000HRH

Deflection against

Steady force 10% Allowable Deflection 35%

Rated Deflection

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Creep (Static , Dynamic)Load-Deflection Characteristics under

Repeated LoadVelocity and Temperature Factor

Deterioration

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0.0

0.2

0.4

0.6

0.8

1.0

1.2

Number of Compression cycles

Rea

ctio

n F

orce

Rat

io

100H(RH)50%NO.1100H(RH)50%NO.2100H(RH)20%NO.1100H(RH)20%NO.2630H(RH)30%100H(RH)52.5%630H(RH)20%

10 102 10

310

410

510

610

71

Repeated compression characteristics of the rubber fender

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Temperature factor

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

0 10 20 30 40 50 60

Compression Strain （％）

Tem

pera

ture

Fac

tor

-20℃ 0℃

60℃

40℃

20℃

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0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 10 20 30 40 50 60

Compression Strain （％）

Velo

city

Facto

r

1％/s

0.0533％/s

0.25％/s

3％/s

18.75％/s

37.5％/s

48％/s

100％/s

Velocity factor

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0

5

10

15

20

25

0 100 200 300 400 500 600 700

Time Elapse (min.)

Com

pres

sion

Stra

in (%

)

100H Initial Strain 8%

1000H Initial Strain 8%

100H Initial Strain 10%

1000H Initial Strain 10%

100H Initial Strain 12%

1000H Initial Strain 12%

100H Initial Strain 17%

Static Creep

Initial Strain SUC1000H SUC100H

8 ％ 9.5 ％ 9.8 ％

10 ％ 12.3 ％ 11.9 ％

12 ％ 14.3 ％ 15.1 ％

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0

0.2

0.4

0.6

0.8

1

1.2

1.4

0 5 10 15 20 25 30 35 40

Reacti

on

Fo

rce R

ati

o

Standard Performance

Compression Strain(%)

C A’A

D’

C’

B’B

Compression Strain

Reaction Force

Compression StrainS. 　 UEDA

Table 5.1 Variation of reaction force against the nominal load-deflection

characteristics

Oil Stockpiling Station (1999) Yume-Mai Bridge (2002)

Manufacturing error 0.90 – 1.10 0.95 – 1.05

Aging 1.00 – 1.05 1.00 – 1.05

Velocity factor 1.00 – 1.10 1.00 – 1.05

Creep The steady load or the mean load shall be less than the reaction

force at 10% strain, and to use the load-deflection characteristics

in consideration of creep.

Repeated

compression

0.8 – 0.9 (at 40% deflection

repeated for more than 10

cycles)

0.9 – 1.0 (at 20% deflection

repeated for more than 10

cycles)

Inclination

compression

Load-deflection characteristics

in consideration of the lateral

force as 10% of the axial force

0.95 – 1.00

Temperature factor 0.95 – 1.25 (at 0 – 50oC) 0.95 – 1.25 (at 15 – 45oC)

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National Oil Stockpiling Kamigoto Base

Thank you very muchfor your patience

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