Anyone can furnish me a concrete lightpole foundation calculation.?
Answer:
Typically light pole foundations are circular concrete shafts. The gound is augered with a truck mounted auger and the hole is dug in what is called "in-situ" soil which means soil in place. The key to the concrete shafts in that they rely on supporting soil friction and end bearing to resist the loads.
The vertical loads are much more benign than the results of lateral forces.
There is an equation in the IBC 2006 (eq 18-1) for nonconstrained conditions (no constraint is provided at the ground surfac, such as a rigid floor or rigid ground surface pavement
d = 0.5A{1+[1+(4.36h/A)]^0.5]
A = 2.34P/Sb
b = diameter of round concrete shaft or diagonal dimension of square post
d = depth of embedment required but not more than 12 feet
h = distance in feet from the ground surface to the point of application of lateral load P
P = applied lateral force in pounds
S = allowable lateral soil-bearing pressure as set forth in section 1804.3 of the aforementioned code and is based on a depth of 1/3 the depth of embedment in psf.
solving this equation involves trial and error. There is a closed form solution but it is too complicated to list here.
There is a lot more to this than meets the eye. If you do not understand concrete-soil interaction and lateral pressure resistance, then you should consult a design professional.
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