CEMP-E
EI 02G001
01 July 1997
(1)
Determine the design load Rd for a given pile in kN.
(2)
(a)
This value can be given in the design plans or computed by the methods referred to in
paragraph 2-11b.
(b)
The design load Rd can be multiplied by a factor of safety, according to the formula
Ru = N Rd
where
Ru = ultimate pile resistance, kN
N = factor of safety
= 2.0 when static load tests are required
= 2.5 when the pile driving analyzer and wave equation analysis are required
= 3.0 when only the wave equation analysis is required. (If a factor of safety has been
established for the piles elsewhere, then use that value.)
If values from both (a) and (b) are available, then use the greater of the two.
(3)
Divide the ultimate resistance value by the pile area using the formula
Su = Ru/Ap
where
with concrete piles or 62,000 kPa with steel piles for subsequent computational
purposes
As = pile cross-sectional area, m
(4)
Compute the minimum rated striking energy for the pile hammer for the particular pile at 4 blows
per centimeter (10 blows per inch.) The formula used depends upon whether the pile is steel or
concrete.
Er 10BPI = As Su/ (70.08 e(-Su/25449) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Concrete Piles
Er 10BPI = As Su1.62/58500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Piles
where
Er 10BPI =
minimum hammer rated striking energy at 4 blows per centimeter (10 blows per inch) of
resistance, kJ
Figure 2-1a. Preliminary Method for Sizing Hammers for Concrete and Steel Piles, SI units
(after Florida DOT Specification, Section 455) .
2-5
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