UFC 4-159-03
3 October 2005
CASE I SINGLE DISTINCT SUPERSTRUCTURE
The shape function for longitudinal wind load for ships with single, distinct
superstructures and hull-dominated ships is given below (examples include aircraft
carriers, EC-2, and cargo vessels):
f xw (θ w ) = cos (φ )
(6)
EQUATION:
90
φ- = θw for θ w
θx
where
(6a)
<
θx
90
(θ - θ ) + 90 for θ w
φ+ =
θx
(6b)
>
180-θx w x
θx = incident wind angle that produces no net
longitudinal force (Table 4-4)
θw = wind angle
Values of f xw (θw ) are symmetrical about the longitudinal axis of the vessel. So when
θ w > 1 8 0 , use 3 6 0 - θ w as θ w in determining the shape function.
CASE II DISTRIBUTED SUPERSTRUCTURE
sin (5γ )
sin(γ ) -
10
EQUATION: f xw (θ w ) =
(7)
0 .9
90
where γ
θ + 90 for θ w < θ x
=
(7a)
- θx w
90θx
90
(θ ) +
180-
for θ w > θ x
γ =
(7b)
+ 180-θx W
180-θx
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