Geotechnical Data and Pile Design - Offshore Structures: Design, Construction and Maintenance - page 273

Allowable stresses in the pile should be calculated with the allowable stress
design by AISC. Note that the one-third increase in allowable strength should
not be considered.
More attention should be paid to the stresses that occur in the freestanding
pile section during driving, as shown in Figures 4.11 and 4.12 . Generally,
stresses are checked based on the conservative criterion that the sum of the
stresses due to the dynamic stresses caused by the impact from the hammer
and the stresses due to axial load and bending (the static stresses) should not
exceed the minimum yield stress of the steel.
The engineering office should clearly define in the calculation notes, draw-
ings and specification the required pile hammers that will be used.
A method of analysis based on wave propagation theory should be used to
determine the dynamic stresses.
In general, it may be assumed that column buckling will not occur as a result
of the dynamic portion of the driving stresses. The dynamic stresses should be
less than 80% to 90% of yield strength, depending on specific circumstances,
Hammer ram
Cushion
Drive cap
Follower used for driving
a pile from above the water
when the final position of the
pile top is required to be below
the water
Joints take compression only
Pile
FIGURE 4.11 Typical arrangement for pile driving.