topic Re: Waffle slab in Robot in Robot Structural Analysis Forum

Waffle slab in Robot

gustavo_c_vasconcellos — Tue, 31 May 2011 23:50:29 GMT

Is it possible to design a waffle slab in Robot?

I imported a waffle slab that I had created in Revit Structure using structural framing with joists and a thin concrete slab over it, but I received many rebar error messages. Is there a better way?

Thanks

Gustavo

Re: Waffle slab in Robot

Rafal.Gaweda — Wed, 01 Jun 2011 07:08:15 GMT

During design process program uses homogenous panel thickness although it may be defined in ARSA as orthotropic one.

I guess (without looking at model) this error messages comes from geometrical limitations for bar distributions. PLease check \ set covers, layers etc.

So to be more precise we need the model file to look at.

Re: Waffle slab in Robot

gustavo_c_vasconcellos — Mon, 11 Jul 2011 22:26:11 GMT

Dear Rafal,

do you have any example of a waffle slab? I use in the majority of my projects a 80x80x28 cm waffle slab. Where 80x80 is the distance between the joist beams. The concrete cap is 8 cm (already included in the 28cm). The size os the joist is 12,5 cm on the bottom and 15,6cm on the top. What is your suggestion: should I model in Revit or directly in Robot as a orthotropic one?

Re: Waffle slab in Robot

Rafal.Gaweda — Tue, 12 Jul 2011 07:25:53 GMT

Look below. We may also try other types of orthotropy.

If you want to design also beams under the plate I suggest to define slab as homogenenous and create "real grillage" of beams underneath.

Re: Waffle slab in Robot

gustavo_c_vasconcellos — Tue, 12 Jul 2011 14:51:38 GMT

Thank you Rafal, I believe that the best solution is to define the slab as homegeneous and create beams underneath. Gustavo

Re: Waffle slab in Robot

faisal.aaouatif — Sun, 11 May 2014 16:49:32 GMT

It would be much more convenient if autodesk dedicates a tool (may be on further version of RSA PLATES) to fully deals with waffle slabs (formwork reinforcement .... ) as ×Csi safe× or other slab dedicated software do.
prestressed slab module would be also very helpful.
Thank you