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REF: Laterally Loaded Pier Foundations

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John,

UBC Section 1806.8 provides formulae for nonconstrained and
constrained pole foundations.  If the pier is not restrained at the surface
by a concrete slab, etc. than the more conservative "nonconstrained"
formula will apply.  The formulae are directly applicable if horizontal force
is known.  If moment is known, I convert it into an equivalent fictitious
force at a height which has the same effect as the given moment.  The
formula is not applicable it a twisting moment is applied to the footing as in
the case of a highway sign.

In the latter case (more generalized and a bit complicated), you could refer
to "Florida DOT Structures Office" - Drilled Shaft Design for Sign and
Highway Structures Program.  The site has a library of programs.
http://www.dot.state.fl.us/Structures/

Hope it helps.

V. Sahni, SE 

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