Is the rebar-function in Robot Reliable?

[Stilie87]

I have modeled a 3way/2 way slab in Robot.

When I calculate the slab it seems to me that the amount of rebar area is too low. Mostly I get 452 mm2/m which is the minimum requirements (NS-EN 1992)

My questions is: 

1. Is these results reliable? It seems to me that deflection is too low
2. What Stadium does robot  use? Stadium 2? ( Concrete cracked. )
3.  What about stiffness of the slab? Long term/Short term?

[Artur.Kosakowski]

Try the following:

Choose the part of the slab where you would expect to have larger reinforcement. Select a node in this area and check what is the value of bending moment for ULS and SLS combination. Use these values to manually calculate reinforcement. If you get different value attach both the model and your hand calcs please.