Design and Construction Considerations for Very Large Floating Structures (VLFSs)
Floating structures
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Transcript of Floating structures
![Page 1: Floating structures](https://reader034.fdocuments.in/reader034/viewer/2022052122/557473f0d8b42a0f178b4805/html5/thumbnails/1.jpg)
Recent Development of Floating Structures
in Japan by use of Rubber Fenders for
Mooring 7th February 2012
Shigeru UEDAS. UEDA
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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
S. UEDA
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S. UEDA MTEC 2007 2 7 /09/2007
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
S. UEDA S. UEDA
S. UEDA
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S. UEDA
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S. UEDA
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S. UEDA
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Lacey Murrow Bridge
S. UEDA
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Food Canal
S. UEDA
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Bergsoysund Bridge
S. UEDA
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S. UEDA
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Nordhordland Bridge
S. UEDA
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S. UEDA
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Rubber Fender
S. UEDA
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National Oil Stockpiling Kamigoto Base
S. UEDA
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S. UEDA
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S. UEDA
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S. UEDA
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S. UEDA
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S. UEDA
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Kamigotou oil strageL 390mB 97mD 27.6mFenderC3000X8C2250X4
Shirashima oil strageL 397mB 82mD 25.4mFenderC2500X16
S. UEDA
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S. UEDACourtesy of Osaka Shinbun
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S. UEDA
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S. UEDA
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Yume Mai BridgeL 410mB 33.8m
FenderSUC2500X24
S. UEDA
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S. UEDACourtesy of Osaka Shinbun
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S. UEDA Courtesy of Osaka Shinbun
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Design of ConnectionFinger Joint
Modular JointRubber Joint
Rolling Leaf Joint
S. UEDA
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S. UEDA
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S. UEDA
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S. UEDA
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Final Unit Jointed 1999
S. UEDACourtesy of Asahi Shinbun
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Mega Float Ph-1 1995-1997 300m×60m×2mPh-2 1998-2000 1000m×121m× 3 m
Phase-2
S. UEDA Courtesy of Okamura
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S. UEDA Courtesy of Asahi Shinbun
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Pavement
Fender
Steel J acket
Steel Pipe Pile
Fig. 5.4 Jacket Type Dolphin and Fender System
S. UEDA
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S. UEDA
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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
S. UEDA
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Creep (Static , Dynamic)Load-Deflection Characteristics under
Repeated LoadVelocity and Temperature Factor
Deterioration
S. UEDA
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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
S. UEDA
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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℃
S. UEDA
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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
S. UEDA
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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 %
17 % - 23.3 %S. UEDA
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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
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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)
S. UEDA
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National Oil Stockpiling Kamigoto Base
Thank you very muchfor your patience
S. UEDA