Instability

[denis.lucey1]

Hi everyone,

Im making a model and getting a lot of instability in the middle of my structure i have moved the nodes in the middle around to try and fix this but still doesnt work. I have releases on the members too. Any help would be appreciated.

[Romanich]

Hi @denis.lucey1 ,

Please zip and upload the model.

[denis.lucey1]

The model is attached to this 

[Romanich]

Just delete all releases for bars and everything should be ok. 

Situation like this will lead to instability:

And why do you have supports at the top of the walls? 

[denis.lucey1]

Ya I'll try that but i think that creates a bending moment at the support which is what I'm trying to avoid. Should the supports not be at the top cause theyre supporting the beam?

[Romanich]

Hi @denis.lucey1 ,

It is enough to assign release to the bar in connection to the wall:

[denis.lucey1]

Ya there's still moments hogging over the supports with releases this wont happen. I'll just have to try get my head around it.