Gates Dynamic Formula
Gates Dynamic Formula
(OP)
I am looking for the Gates Dynamic Formula. A google search only found references to it, and none of my books have it. If someone could provide this I would greatly appreciate it.
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Gates Dynamic Formula

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RE: Gates Dynamic Formula
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RE: Gates Dynamic Formula
Gates Formula
Ru = [7 x (Er)^0.5 x log(10Nb)]  550
Ru = Ultimate pile capacity (kN)
Er = Manufacturer's rated hammer energy (Joules) at the field observed ram stroke
log(10Nb) = logarithm to base 10 of the quantity 10 multiplied by Nb
Nb = number of hammer blows per 25mm at final penetration
The manual recommends using a safety factor of FS = 3.5 when using the Gates formula.
Bowles' Foundation Analysis and Design, 1968, gives the Gates formula as:
P = (1/7) x (kE)^0.5 x (1log(s))
P = safe load capacity, tons (FS = 3)
E = gross hammer energy, ftlbs
k = 0.75 for drop hammers or 0.85 for all other hammers
s = set per blow for last 6 inches of penetration or for at least 20 blows (refusal)
RE: Gates Dynamic Formula
The above should get you started. (I googled " Flaate Dynamic Formula Piles "
RE: Gates Dynamic Formula
So there is this drunk stumbling aound this lamp post at a city street corner one night. A cop walks up to him and says "What are ya do'in Chalie?" " I lost my wallet" he replies. So the cop helps him look for it. After a few minutes, the cop says "Where do you think you lost it?" To which the drunk replies "Outside of Jimmies Bar, about halfway down the block." "Then why are you looking here?" asks the cop. "Because the light is better here."
This is kind of how I feel about dynamic formulas. They are fast easy to use do not require a lot of input data and have an equal chance of being right or wrong. In this day and age, I would strongly advocate for wave equation, supported by a resonable static anaysis. It is much more accurate, and really does not take a long time to prepare.
RE: Gates Dynamic Formula
http://www.vulcanhammer.info/drivability/
They have worked examples to go with it.
And I entirely agree with DRC1's assessment of dynamic formulae. The wave equation programs can be found in the same place.
http://www.pz27.net
RE: Gates Dynamic Formula
The numbers worked out as they given, so all should be good.
DRC1, I like your observation of dynamic formulas. Again, thanks for the help and input.