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Re: Waffle slab design

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Javier,
 
There is a small amount of discussion of waffle slabs in the PTI Technical Note #11, which I believe you can download for free from www.adaptsoft.com.  If not,  I can send you a copy if you want it.
 
I've got to admit I don't know how useful it is, since I've never designed a waffle slab.
 
Waffle slabs are not post-tensioned in the US - the savings in materials doesn't make up for the increase in labor, but it is my understanding that they are built somewhere.
 
Gail Kelley