Slab on grade - lack of convergence for soil with uplift

[Anonymous]

Hi,

I'm calculating a slab on grade. Although it has just compression loads, calculation doesn't  converge. I think it has no sense. What is wrong?

Thanks.

@Anonymous Artur Kosakowski edited the topic from 'Slab design / support rigidity' for better findability. 

[Artur.Kosakowski]

Hi @Anonymous

As far as I can see you have also moments which may actually cause uplift. Try to set the nonlinear analysis parameters as below:

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous]

Hi Artur,

I have set this parameters previously but calculation doesn´t converge.Furthermore ,I have increased the slab thickness up to 120 mm and it doesn´t work anyway.

[Artur.Kosakowski]

Hi @Anonymous

Could you attach your model?

[Anonymous]

Hi Artur,

Structural model is attatched.

Anyway I am testing  another model with rigid links in the base of the pedestals as you can see in the picture attatched. In that way calculation seems to be ok .

[Artur.Kosakowski]

Hi @Anonymous

All combinations converge with slightly increased tolerances.

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.

[Anonymous]

Hi Artur

Sorry, but I don't fin what changes have your made in the solved model, tolerances seems to be the same.

On the other hand , do you think that the other solution with rigid links could be right as well?.

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

Sorry, but I don't fin what changes have your made in the solved model, tolerances seems to be the same.

On the other hand , do you think that the other solution with rigid links could be right as well?.

Yes, I think it is correct too. 

If you find your post answered press the Accept as Solution button please. This will help other users to find solutions much faster. Thank you.