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71
rise time from 2 L/c to exclude any reflections from the pile tip of the initial input wave.
The assumption of this method is that the skin friction of the bottom one rise length is the
same as the one additional rise time length above.
Based on that assumption, the skin
resistance is the separation of force and velocity at point “a” added to the increase in
resistance from point “b” to point “a” as stated below.
(29
(29
(29
[]
b
b
a
a
a
a
ZV
F
ZV
F
ZV
F
SFT



+

=
(71)
Once the estimate of dynamic skin friction is determined using the GRL
procedure, as described above, the static tip and skin capacity were calculated according
to the following methodology (Method 1).
First, the total dynamic capacity, RTL, is
determined using the Case solution for dynamic capacity (Equation 314 for J
c
equals 0).
Then, knowing the total dynamic capacity and the GRL estimate of skin dynamic
capacity, the dynamic tip capacity,
TT
, could be computed.
SFT
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 Spring '11
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