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RE: Flag Pole Footings.

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You may wish to consider the SEAOC Seismology opinion for cantilever columns, 
which suggests the use of a grade beam between a pair of cantilever columns 
and has some limitations regarding the percentage of total
shear (by trib area) that should be applied, if you wish to use a 
reasonable "R" value for the design of the rest of the 
single family occupancy.  This opinon is used in some jurisdictions in California.


It is like having a "restrained" flagpole, but is actually better, since you can 
control the stiffness of the grade beam, much better than the stiffness 
of the soil.

J. Diebold, SE

http://www.seaoc.org/Pages/committees/seismpdfs/Positions/CantilColOpn.pdf



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