The document discusses methods for mooring floating structures in Japan, focusing on the use of rubber fenders. It describes four main mooring systems - chains/cables, tension legs, dolphins with fenders, and jackets/piles with fenders. The document then examines forces that affect floating structures like wind, waves, currents and seismic activity. It provides examples of floating structures moored using rubber fenders and discusses fender properties, performance factors, load-deflection characteristics, and variability in reactions forces over time.

1. Recent Development of
Floating Structures
in Japan by use of
Rubber Fenders for
Mooring
7 th February 2012
Shigeru UEDA
S. UEDA

2. Design of Mooring System
Methods of Mooring System
1) Chain, Cable ， Anchor ， Sinker
2) Tension Leg
3) Dolphin and Rubber Fenders
4) Jacket ， Pile and Rubber Fenders
External Forces
1) Wind
2) Waves, Wave Drift Force
3) Current
4) Seismic load
Motions and Mooring Forces are calculated
by Numerical Simulation
S. UEDA

3. a) Chain, Cable and Anchor, Sinker b) Tension Legs
c) Dolphin and Fenders d) Jacket, Pile and Fenders
Station Keeping Systems of Floating Structure
S. UEDA UEDA 2007 ７ /09/2007
S. UEDA 2
S. MTEC
S. UEDA

4. S. UEDA

5. S. UEDA

6. S. UEDA

7. Lacey Murrow Bridge
S. UEDA

8. ood
anal
S. UEDA

9. Bergsoysund Bridge
S. UEDA

10. S. UEDA

11. Nordhordland Bridge
S. UEDA

12. S. UEDA

13. Rubber Fender
UEDA

14. ational Oil Stockpiling Kamigoto
ase
S. UEDA

15. S. UEDA

16. S. UEDA

17. S. UEDA

18. S. UEDA

19. S. UEDA

20. Kamigotou oil strage
L 390m Shirashima oil strage
L 39７ m
B 97m
B 82m
D 27.6m
D 25.4m
Fender
Fender
C3000X8
C2500X16
C2250X4
S. UEDA

21. Courtesy of Osaka Shinbun
S. UEDA

22. S. UEDA

23. S. UEDA

24. Yume Mai Bridge
L 410m
B 33.8m
Fender
SUC2500X24
S. UEDA

25. Courtesy of Osaka Shinbun
S. UEDA

26. S. UEDA Courtesy of Osaka Shinbun

27. Design of Connection
Finger Joint
Modular Joint
Rubber Joint
Rolling Leaf Joint
S. UEDA

28. S. UEDA

29. S. UEDA

30. S. UEDA

31. Final Unit Jointed
1999
S. UEDA
Courtesy of Asahi Shinbun

32. Mega Float
Ph-1 １９９５－１９９７
300m×60m×2m
Ph-2 １９９８－２０００
1000m×121m× ３ m
Phase-2
S. UEDA Courtesy of Okamura

33. S. UEDA Courtesy of Asahi Shinbun

34. Pavement
Fender
Steel Jacket
S. UEDA
Steel Pipe Pile

35. S. UEDA

36. 600
500
SUC1000HRH
Re a c tion Fo rc e （ｋ
N)
400
300
200
Deflection against
Steady force 10% Allowable Deflection 35%
100
Rated Deflection
0
0 10 20 30 40 50
Co m pre s s ion St ra in （％）
Figure 3 Load-Deflection Characteristics of Rubber Fender
S. UEDA

37. Creep (Static , Dynamic)
Load-Deflection Characteristics under
Repeated Load
Velocity and Temperature Factor
Deterioration
S. UEDA

38. Repeated compression characteristics of the rubber fender
1.2
1.0
Reaction Force Ratio
0.8
0.6
100H(RH)50%NO.1
0.4 100H(RH)50%NO.2
100H(RH)20%NO.1
100H(RH)20%NO.2
0.2 630H(RH)30%
100H(RH)52.5%
630H(RH)20%
0.0 2 3 4 5 6 7
1 10 10 10 10 10 10 10
Numb e r o f C o mp re s s io n c yc le s
S. UEDA

39. Temperature factor
1.6
1.4 -20℃
0℃ 20℃
1.2
1
Temperature Factor
0.8
0.6
40℃
0.4
60℃
0.2
0
0 10 20 30 40 50 60
S. UEDA
Compression Strain （％）

40. Velocity factor
1.4
1.2 1％/s
0.0533％/s
1
0.25％/s
Velocity Factor
0.8
3％/s
0.6 18.75％/s
0.4 37.5％/s
0.2 48％/s
0 100％/s
0 10 20 30 40 50 60
Compression Strain （％）
S. UEDA

41. Static Creep
25
100H Initial Strain 8%
20 1000H Initial Strain 8%
100H Initial Strain 10%
Compression Strain (%)
15
1000H Initial Strain 10%
10 100H Initial Strain 12%
1000H Initial Strain 12%
5
100H Initial Strain 17%
0
0 100 200 300 400 500 600 700 Initial Strain SUC1000H SUC100H
8％ 9.5 ％ 9.8 ％
10 ％ 12.3 ％ 11.9 ％
Time Elapse (min.) 12 ％ 14.3 ％ 15.1 ％
S. UEDA 17 ％ － 23.3 ％

42. B
Reac B’
tion A C A’
For C’
ce
D’
Compression
Strain
Standard Performance
Compression Strain(%)
S. UEDA Compression Strain

43. 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 0.8 – 0.9 (at 40% deflection 0.9 – 1.0 (at 20% deflection
compression repeated for more than 10 repeated for more than 10
cycles) cycles)
Inclination Load-deflection characteristics
compression in consideration of the lateral 0.95 – 1.00
force as 10% of the axial force
Temperature factor 0.95 – 1.25 (at 0 – 50oC) 0.95 – 1.25 (at 15 – 45oC)
S. UEDA

44. ational Oil Stockpiling Kamigoto
ase
Thank you very much
for your patience
S. UEDA