Instability

[Michele100100]

Hello,

something happened in my model: I have 2 bracing between columns: 

If I put LU45x5 profile everything is ok, if I change it for some bar with diameter 15mm, I have instability 3type at node 149.

Why this heppens? any advise? thanks. 

attached the model

[Krzysztof_Wasik · Accepted solution]

Hi @Michele100100 

It is numerical (solver0 warning not related to problem with model definition. Ignore warning. Refer to Instability of type 3

[Michele100100]

thanks