Light pole foundation design
Light pole foundation design
(OP)
I need to design a spread/shallow foundation for a laterally loaded pole. Hi wind loads create a considerable moment. Any ideas?
Thanks
Thanks
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Light pole foundation design
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RE: Light pole foundation design
You can model the pier in a 2D analysis program. Another proprietary program is "L-Pile". Not sure where you can find it online. There are also some nomographs and charts for laterally loaded piers in the Structural Engineering Handbook by Gaylord & Gaylord.
RE: Light pole foundation design
RE: Light pole foundation design
Is there some reason a drilled pier is not possible on this site?
If a drilled shaft is not possible, are drilled helical anchors an option on this site? Have designed a couple of sign foundations, where drilled shafts were not possible, using helical anchors as 'hold downs' on the edges of the footing.
RE: Light pole foundation design
Get the AASHTO Design Manual for signs and luminaires. There are cookie cutter formulae for the pier embedment based on moment and soil lateral stiffness. I just did one of these for a small custom welded road sign and compared the AASHTO vs IBC formulae (since my knowledge of AASHTO codes is neglible) . The IBC formula yielded one more foot of embed than the AASHTO formula...
These formulae do not (if I recall) tell you anything about the bending moment in the pier. You can look up some solved equations for beam on elastic foundation stuff with the boundary conditions you may have. The upper bound moment is the moment at the base of the pole.
L-Pile is nice and is the most suitable software, but my opinion is that a material non-linear FEA is perhaps over-analysis given the "lateral soil stiffness modulus" is known to maybe ONE significant figure. My old boss (geotechnical) would groan, roll his eyes and simply look up presumptive lateral modulii like this and I suspect that there is great degree of uncertainty with any such lateral soil stiffness determination. A 2D FEA model with linearly elastic soil springs is probably a reasonable simplification for the amount of lateral deflection most structural engineers would deem OK.
RE: Light pole foundation design
RE: Light pole foundation design
I appreciate your help
Thanks
RE: Light pole foundation design
RE: Light pole foundation design
1. Design of Concrete Foundation Piers, by Frank Randall; Portland Cement Association (PCA), Skokie, IL, May 1968
2. Resistance to Overturning of Single, Short Piles" - by Eli Czerniak; ASCE Journal of the Structural Division, Vol. 83, No. ST2, Paper 1188, March 1957
3. 1997 Uniform Building Code (UBC), Section 1806.8, page 2-45;
4. Outdoor Advertising Association of America (OAAA) - New York, NY
5. Tapered Steel Poles - Caisson Foundation Design; Prepared for United States Steel Corporation by Teng and Associates, July 1969
Regards,
Lutfi
RE: Light pole foundation design
http://ww
I can't link up to it tonight since my home PC doesn't have Mathcad, but I hope it's the right one.
RE: Light pole foundation design
But perhaps that is just so they don't get sued by some yahoo on eng-tips. :)
Mike
RE: Light pole foundation design
RE: Light pole foundation design
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RE: Light pole foundation design