UFC 4-159-03
3 October 2005
8-4.8
Static Analysis. A quasi-static analysis is performed on the mooring
system using a mooring analysis program (W.S. Atkins Engineering Sciences, AQWA
Reference Manual; other approved mooring analysis programs could have been used).
Each mooring leg is initially pretensioned to a tension of 4.4 kilo-newtons (10 kips).
Quasi-static analysis is performed for various combinations of wind and current
directions. Quasi-static results for various wind directions in conjunction with a 60-
degree flood tidal current of 0.6 knots (0.31 m/s) are shown in Table 8-5.
Table 8-5. Quasi-Static Leg Tensions for the Spread Mooring at Various Wind
Directions With a Flood Tidal Current
Wind Direction
300
600
900
1200
1500
1800
LEG
0
kN
1
52.49
214.99
447.01
609.02
945.05
866.04
541.00
2
-
62.50
347.99
486.02
769.03
927.03
571.03
3
693.00
941.04
844.02
588.02
560.00
343.99
93.50
4
668.00
808.04
611.02
387.00
255.02
45.60
-
5
622.01
490.03
84.52
-
-
-
-
6
563.02
454.00
64.72
-
-
-
-
7
-
-
-
-
-
220.99
449.01
8
-
-
-
-
-
309.02
564.00
Kips
1
11.8
48.33
100.49
136.91
212.45
194.69
121.62
2
-
14.05
78.23
109.26
172.88
208.4
128.37
3
155.79
211.55
189.74
132.19
125.89
77.33
21.02
4
150.17
181.65
137.36
87
57.33
10.25
-
5
139.83
110.16
19
-
-
-
-
6
126.57
102.06
14.55
-
-
-
-
7
-
-
-
-
-
49.68
100.94
8
-
-
-
-
-
69.47
126.79
- Indicates that the leg does not get loaded
174
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