Concrete slab & Downstand beams

[nicoBJ9ZU]

Hi.  

So to clarify first off, I'm brand new to robot so I'm still learning.  Sorry if my questions seems dumb.  

I have been trying to look for an answer, but I cannot seem to find one anywhere.  I'm trying to model beam and slab model with let say a 200thick slab with MONOLITHICALLY casted downstand beams with a total depth of 600mm (200mm slab depth, plus 400mm web).  What is the best way to do this?  I see a lot of videos where people just model beams in a grid and then simply puts a slab on, but that is wrong, because your doubling up on stiffness or does robot automatically take that into account?

At this moment I think I can just model a 200 thick slab and simply install 400 deep beams with the appropriate offsets?

Any assistance would be appreciated.

[EduardoMeruvia]

Hi @nicoBJ9ZU , 

You could use the workflow proposed by @Artur.Kosakowski  in the post below;

https://forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-design-reinforcement-for-rc-t-...

[nicoBJ9ZU]

Hi Eduardo,

It really surprises me that robot 2023 does not have a simple way to determine and model the beams.  The solution seems ok and I would need to check this.  Another solution would be to simply calculate the full moment:  Mtotal = Mweb + Mshell + Maxial, where Mweb is the moment in the web from robot, the moment in the shell is the moement in the shell for the effective beam flange width and the moment due to the axial load is simply the axial load generated multiplied by the offset.  I will do a comparison and get back.  Just wondered if there was a faster way that I missed.