Cable net Modeling

Hello Everyone,

I’m currently creating ( in Rhino 6 and Grasshopper 1.3 ) a Karamba model for the study of Cable Nets. This Cable Net is Façade Structure System of a Tall Buildings. (Cable Net + Glass Panel) (like This Case : http://www.enclos.com/service-and-technology/technology/structural-glass-facades/facade-structures/cable-net 17 )

I want to Analyze with Th. II Component and optimize this structure with “Opossum” component. In this step I get Error whit its dead load (it has Buckling), while I should set bending zero. Although I have been trying to understand what I’ve been doing wrong for quite some time, I haven’t been able to figure it out yet. Consequently, if anyone could take a look at my script it would be greatly appreciate it.
Thanks , MoStafa

Question.gh

Replies to This Discussion

Permalink Reply by Karamba3D on September 3, 2018 at 1:45pm

Hello MoStafa,
you used the ‘EigenModes’-component to check structural stability. However this component does not consider the geometric stiffness. Rather use the ‘Natural Vibrations’- or ‘BucklingModes’-components when the effect of normal forces shall be included (see attached definition).
The iteration of normal forces in the ‘Analyze Th.II’-component leads to compressive forces in the cables. That is why they buckle.
Best,
Clemens

Attachments: