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Re: Waffle slab design

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Semiconductor manufacturing uses waffle slabs due to
their high load and vibration requirements.  I've
designed a couple and am constantly evaluating them
for load capacity.  Also, leaving the center out of
the waffle makes running utilities (process gasses,
chemicals, electrical, controls and ventilation) much
easier.  In cleanroom semiconductor, the tools are
usually fed from below (and their support equipment is
usually on the floor below) and ventilation is above.

Phoenix, AZ

--- GSKWY(--nospam--at) wrote:

> Out of curiosity, how common is waffle slab
> construction, in the US and 
> elsewhere at this point?
> Over the years, I've been asked to look at several
> waffle slabs in the 
> Northeast and the mid-Atlantic area.  All of there
> were built sometime in the 70's.  
> That seems to have been the peak of its popularity
> as an architectural 
> concept.
> Is it used more in other parts of the country?
> Gail Kelley

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