Flat slab formed by precast slab

[ramihabchi]

Is it possible to make a flat slab a half slab precast?(flat slab with perimeter beams of same height of slab and having precast slabs of certain height and covered by cast in place topping)
I found a research on the net where it proposes that adequate transverse connections on joint between precast slabs can make the panels act as two way slab(name of research "experimental study of two way half slab precast using triangular rigid connection")
So I need help on the questions below:
1)the problem with the reasearch is that it states that moment could be transferred transversally with adequate detailing but failure/cracking load in transverse direcrion is 16% less than in the monilithical slab case.so If I want to apply their detailing in the transverse direction I do not know how much load I can let the slab bear to act as two way.any help?
2)the research also shows that not only transverse transfer of moment is possible but also longitudinal transfer. also the cracking happens at 16% lower load than that of monolithical slab.does anyone knows about such detailing?how can I increase reinforcement for slab dimensions other than stated in research(for e.g increase moment by 16%?)
I know that we normaly prevent lapping near mid span but its still possible.thank you

 

[Agent666]

Trying to make a one way precast (presumably prestressed) flat slab act as two way after applying the topping doesn't sound particularly efficient if I'm understanding what you want to do here?

Maybe if you posted some sketches or further information on your particular scenario as it's quite hard to decipher exactly what you are trying to describe here. I doubt anyone will probably be intimately familiar with the research you're quoting as the application seems quite far from normal practice, so you're going to have to throw folks a few more bones to understand the configuration being proposed.

 

[ramihabchi]

The research is attached

 

[ramihabchi]

Clarification sketch attached

 

[MIStructE_IRE]

Precast flat slab is available in my country (Ireland).

http://www.oranprecast.ie/index.php/precast-systems/tech-1

I haven’t gotten the opportunity to use it yet though.

 

[HTURKAK]

Yes..... but each panel is a single pc element.


I suspect this is a proposal only... with this triangular rigid connection, you cannot transfer the full load ... moreover, all the main reinforcement spliced at one section . In order to transfer full load the joint splice welded etc..

IMO, it is not a good idea and will not be economic to join the pc elements at critical section. In Europe, specially at Eastern,
the use of half slap ht is one of the common methods. But, the pc slab elements either one way slab ( extending from support to support) or panel for two slabs .

If you write Filigran slab and browse the web, you will find hundreds of PC manufacturers, details etc.

One of the pictures to see the concept;

 

[ramihabchi]

Do you think If I provide hidden beam in the middle, reinforced enough to support the slab ,will be a solution?being just enough reinforcement make it act as a support right?so I can make it bear the 4
6 precast slabs in the picture I posted.