Quantcast Notes for Table 7

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NOTES FOR TABLE 7.
1) Wind speed (ASCE) is derived from "Minimum Design Loads for Buildings and Other Structures,"ASCE 7-95
for 50-year, 3-second gust, exposure C, converted to 30-second duration, exposure D (.84 x 1.086 for hurricane
prone areas, .87 x 1.086 for others). NNSY, PSNS, SUBBASE Kings Bay, New London, and Bangor use
exposure C. To obtain 100 year recurrence wind, multiply by 1.105 for east coast and 1.107 for west coast. To
obtain 500 year recurrence wind, multiply by 1.33 for east coast and 1.23 for west coast. Wind speeds in
Everett are in a special wind region addressed in the Commentary.
2) Wind speed (Changery/Simiu) is derived from "Historical Extreme Winds for the United States Atlantic and
Gulf of Mexico Coastlines," by M.J. Changery, NCC, NOAA, May 1982 and from "Extreme Wind Speeds at
129 Stations in the contiguous United States" by E. Simiu, NBS, March 1979. Both reports record fastest mile
wind speeds which are converted to 30-second duration, exposure D (1.086 x 60/speed and Fig C6-1 of ASCE
7-95)
3) Wind (DM 26.6 `86) is based on current version of Navy Design Manual 26.6, "Mooring Design Physical and
Empirical Data" (1986) for 30 second wind, highest average possible.
4) Wind (DM 26.6 '68) is based on previous version of Navy Design Manual 26.6, "Mooring Design Physical and
Empirical Data" (1968) for 5- minute duration for highest average possible, converted to 30-second duration (x
1.25).
18
NFESC TR-6012-OCN Rev B
U.S. NAVY HEAVY WEATHER
MOORING SAFETY REQUIREMENTS





 


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