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Fwd: Re: Free standing masonry walls

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Kirk Pysher wrote:
> 
> Has anyone had the opportunity to review the standard free standing wall
> designs available in some building departments?  I recently reviewed the
> design in Fountain Valley for a 4" block wall with 8" pilasters @ 12 ft
o.c..
> The wall only contains horizontal steel 2-9gauge @24" o.c. and the
pilasters
> use 4-#4 vertical bars continuous.  The maximum height of the wall is 6'. 
The
> moment at the base of the pilaster is resisted as a "pole type foundation".
> The pilaster foundation is 3' deep and 16" wide.  Running some quick
numbers
> for seismic & wind loads it became apparent to me that the wall was not
stable
> based on current UBC standards.
> 
> I am looking for some information on how the city can put out such a design
if
> it is not stable.  Or the history of these types of designs that would
explain
> why it is all right.  If anyone could help I would appreciate it.
> 
> Thanks
> Kirk D. Pysher
> kdpysher(--nospam--at)msn.com
> 
Years ago I reviewed some of these standard details when a
contractor presented one to me. He wanted the same thing except
6'-8" or something. I couldn't get them to calc. Also, I think
if you look at some of the damage in the Northridge E/Q, you will
find that a LOT of these 6'-0" block fences failed. My recommendation
is that you don't use these as a basis of design.
Regards,
Bill Allen


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