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Re: Concrete Poles

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Dr. Rutledge, of Purdue University, was commissioned in 1938 by the
Outdoor Advertising Assn. of America to investigate the lateral
stability of cantilever uprights. He developed a series of nomographs
for this purpose. The design of foundations for outdoor signs has been
based upon his work for many years.

There are also (trial and error) formulas contained in the Wisconsin
Code ILHR 53.28 and the 1997 UBC 1806.8 that can be used to solve this
type of problem.

A similar sort of problem is addressed in the USS Steel Sheet Piling
Design Manual (1975) for cantilevered sheet pile walls.

You should also check NAVOC for more information. Your friendly
geotechnical engineer must have a copy of this.

Perhaps a geotechnical engineer might also comment on how to handle
frost loosening in the upper  layers of soil.

Jim Kestner, P.E.
Green Bay, Wi.