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RE: Slender Masonry Walls

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My read is that the main criteria you must meet is to ensure that f'm < 600
p.s.i., deflection at midspan due to all applicable load combinations is
limited to .007h and that h'/t < 30 - also need to check out the interaction
diagrams & meet add'l criteria in the case of shear walls..........For a
good example of the design of a 24 ft high 8" CMU wall see:  Seismic Design
of Buildings & Bridges - Alan Williams, published by engineering
press...................J. Baltar

> -----Original Message-----
> From:	Kipp Martin [SMTP:KAMartin(--nospam--at)]
> Sent:	Monday, April 19, 1999 08:06
> To:	seaint(--nospam--at)
> Subject:	Slender Masonry Walls
> I recently completed a design for a masonry building with walls 27'-0"
> tall using 8 inch CMU.  I followed the Load Factor Design method of the
> 1997 UBC and satisfied both the strength and serviceability requirements.
> A senior co-worker has questioned my design, primarily because the h/t
> ratio is over 40.  He says that the "slender wall" design approach is "new
> and untried" and "pushing the envelope".
> I have not heard of any problems associated with properly designed and
> detailed slender masonry walls.  I don't consider the design method
> particularly "new" as the publication that I reference was printed in
> 1986.  Am I "pushing the envelope" designing a 27 foot tall wall with 8
> inch block?
> --Kipp A. Martin
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