uplift uz+ vertical downward load case not converging

[c.lucchetti]

Already read and modificate as suggested in https://forums.autodesk.com/t5/robot-structural-analysis-forum/self-weight-load-case-not-converging-...

 I have the same problem. I have only z- load cases and calculation do not converge. 

What's wrong with my model? Someone can help me?

Thank you in advance

[Simau]

Hi @c.lucchetti 

Please correct non linear analysis as below

Model attached

[c.lucchetti]

Thank you very much. I would like to understand what was the problem to avoid other problems.

In non linear analysis should load cases be always auxiliary cases? 

And what about combination? I suppose they are not auxiliary..

Now in previous file (attached) I added uplift wind loads and seismic Ex loads and than I try with combination.

Same previous problem. Is it a load value problem or an other  issue?

Thank you again..

[Simau · Accepted solution]

Hi  @c.lucchetti 

In non linear analysis should load cases be always auxiliary cases?

Yes, except self weight 

And what about combination? I suppose they are not auxiliary..

Correct, if sw is included

Now in previous file (attached) I added uplift wind loads and seismic Ex loads and than I try with combination.

Same previous problem. Is it a load value problem or an other issue?

the non-convergence is due to the fact that the structure is not stable.
For example, If we increase the pavement load to 20kN/m², the model converges

Model attached