Problem with modal analysis

[StructuralSilver55]

Hi! 

I continued building my model (attached), but when I try to run the modal analysis to apply sismical spectrum, RSA gives me the next problem : 3060 execution error . I have one advice about instabilities during the analysis, I have tried to solve them dividing the mesh.. re-meshing the place where I have the problematic node... but the problem continues and every time is a different node!

I've been trying to solve this problem for a long time, and I don't know why a node in the middle of a mesh gives a instability problem.

Thank your very much for your help.

Click here to obtain model.

[Rafal.Gaweda]

Use Skyline solver

[StructuralSilver55]

Thank you very much Rafal, but i continue havin inestability problems, how can I solve them? 

¿Why changing the solver the analysis run? Could your explain it?

Thank you!

[StructuralSilver55]

I continue having problems with the model, when I try to print strenghs in the walls (in global Z direction, MPa), they are not very logical, i can see tensions in some parts of the walls (they are not very logical because I used linear relases for all rotations between walls and horizontal shells) . 

Could you help me with this?

Thank you very much!

[athurD]

for you.

[Rafal.Gaweda · Accepted solution]

But there are no supports in XY direction in your model.

Try my file, you can use any solver you want