What type of slab?

[jeffatGE]

I am trying to detirmine the 'slab-of-choice' for a building. I have a long, relatively narrow, building (4:1 ratio) with bearing walls providing a series of one-way slab scenarios. All-said there are roughly 5 different conditions--ranging between a 2-spans (24' max) and 3-spans (18' max). The loads are fairly high, and the thickness of the slab must be as thin as possible--I'm trying to keep it under 8". With so many different zones--is a post-tensioned slab practical? The only choice that has been barred--is a hollow-core slab. Given a scenario with varying support conditions, high loading, and tight thickness criteria--what are your thoughts on the best type of slab?
Much thanks.

 

[JAE]

A post tensioned slab would work - not sure if 8" would work, though. Even with different adjacent spans, you can alter the profile of the tendons to accommodate and balance the forces to limit any weird deflections.

But keep in mind that Post tensioned slabs cannot really be cut into in the future so alterations, adding stairs, etc. are difficult.

 

[dik]

I'd probably go for the 18' span; you may be able to do this with normal reinforced concrete. With post-tensioning, it's a breeze and you may be able to thin it down to about 6&quot;<->... although it might get a little bouncy