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Re: Enercalc-Pole Embedment in Soil

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George-
It is not the depth of the pier that is important but the relative stiffness 
of the pier to soil (or rock).  The simplest treatment I've seen for treating 
this is a 1957 ASCE paper by E. Czerniak.  This paper treats short piers 
(defined as having a Length to diameter ratio of 10 or less) as rigid.  It is 
a more rational formula than the Outdoor Advertising Sign group that 
developed the UBC formula.  It will treat any combination of Shear and 
moment.  This allows treatment of piers fixed or pinned.  The UBC formula is 
really limited to a pole loaded at the top.
Regards,
Bill Cain SE
Albany CA