Hello,

I’m quite new with Kiwi. Currently using it on a simple study case : steel trussed beam with lower external tie rods.

These tie rods are basically cables.

Linear analysis using only beam elements is pretty consistent, as the rod cross section has very small bending stiffness, behavior is close to cable. Resulting efforts N in the beams are consistent with some FEM (linear and non-linear) structural calculations.

But when trying to use ‘real’ cable elements in Kiwi, so running non-linear analysis (I suppose it’s a must with cable elements), axial forces results N are far from what I should get.

NB : a very low pre-stress was introduced for convergence purpose only

Maybe I missed some fine parametrization of the non-linear analysis ?

Otherwise I don’t get it.

I attach the gh file.

210616_test_kiwi_verriere.gh (39.2 KB)

Thanks,