Help Troubleshooting, (Error type 1 instability)

[Anonymous]

Hi all,

I am trying to model a lattice frame with pinned joints, I have added all the loads and have put all the releases as pinned-pinned. However I am getting instability type 1 error. 

Does anyone know the root of this?

Please find the robot file attached.

Thanks all!

Oliver

[Anonymous]

Hi all, i'm coming across instability type 1 error when I try to model my 2D lattice radio tower, does anyone know where I am going wrong? 

It may be to do with the releases for using the wrong model type?

Should lattice structures be modelled as a 2D truss or 2D frame?

Please find model attached.

Thank you al

Appreciate you're replies,

Oliver

[Rafacascudo · Accepted solution]

If you want to make your structure work only with axial forces, change the structure type to 2d truss and you will be free of instabilities warnings.

On geometry/structure type