Slabs As minimal

[Anonymous]

A23.3-04 Design code art 7.8.1 say: A minimum area of reinforcement of 0.002Ag, shall be provided in each direction.

I think Robot use twice As minimal when we have two rows of reinforcement (X- and X+), am I wrong?

Thanks for your answer

[Rafal.Gaweda]

Example file please.

[Anonymous]

See attachments please

[Anonymous]

Hi Rafal

Have you had time to see my files ?

Thanks

[Rafal.Gaweda · Accepted solution]

Minimum reiforrement is calculated on side of tensioned fibers

In case on envelope you can get this:

You can steer calculating of min reinforcement here

[cuerdaromero]

From this discussion, I understand that when reinforcement is required on both the top and bottom, Robot compares each required reinforcement area (Asreq) with the minimum value (Asmin). For instance, in a slab section, if Asreq is positive but less than Asmin, Robot will use Asmin. This implies that in areas with Asreq > 0, Robot might apply Asmin for both top and bottom. Referring to ACI standard, particularly section 24.4.3.2, it suggests considering Asmin either on the top, bottom, or distributed across every face of the slab. My understanding is that it's permissible to place all of a slab's Asmin either on the top or bottom. It's important to remember that this Asmin is introduced to control shrinkage, distinct from the Asmin required in beams where it's used to provide minimum simple concrete resistance. Can anyone confirm this interpretation?

@Rafal.Gaweda @Anonymous 

So, going back to Robot analysis, in those cases were As->0 and As+>0, we are going to generate doble counting. 

In those cases you will have