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Re: Load Capacity of a Holddown Post as a Compression Member

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Dave, Andrew and Tom.

Thanks for the input.

This is a retrofit plywood shear wall on balloon-framed studs in the second
story of an 1880's era building.  The critical portion of what will become
the balloon framed holddown stud is in the first story where the stud is
about 12 feel long and the full overturning load is applied at the second
floor level -- thus, the first story stud definitely needs to be doubled.
In the second story where the plywood sheathing will be applied, the
unbraced length of stud is about 11 feet [they no longer grow trees like
that that will produce 24-ft long full dimension, straight and clear, 2"x4"
studs].  Because of complications at the second floor level, and at the jamb
of an adjacent second story window, I'd prefer to avoid having to double the
stud in the second story if it is not necessary.  I think that the Roark
Table will help get me to the answer.

Since this shear wall is to have plywood applied one side only, I will
include the eccentricity of the shear load application in the analysis of
the holddown post.


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