Center of gravity of 3d truss

Hi! I'm trying to get the center of gravity or center of mass of this parametric 3d truss, line modeled with grass and model ensembled with karamba:

perspective viewsuperior viewThe numbered points are the place of the circular concrete supports for the truss.
I need to get the center of gravity of the truss because i want to match it with the center of torsions, which I move changing the circular supports radio (changing stiffness), in order to decrease earthquake effects due to torsion.
Is there any option in karamba to get the place of the center of gravity of the truss?
Thanks!

Replies to This Discussion

Permalink Reply by Robert Vier on September 3, 2014 at 3:38am

There s no function available for this. But you can build it yourself:

- Take the center of each beam and multiply this vector/point with its weight

- Add all those vectors

- Divide the resulting vector by the total mass

There is more than one workaround to get the mass of each beam.

One possibility is to disassemble the model and assemble a new one with a grafted element-input. then you get a list of models, each containing just one element - and also the mass of each model.

Best

Robert

Permalink Reply by Fred Becquelin on September 3, 2014 at 4:09am