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Abacus - constraining a wing box

Abacus - constraining a wing box

Abacus - constraining a wing box

(OP)
Hello.

I'm new to Abacus, but I really like it.

I'm trying to model the stresses in the wing box imported from CATIA V5 (http://imgur.com/WJptbul), but I fail to properly constrain the system so I end up with something like this: http://imgur.com/V6KdOiz

What am i missing?

In the actual setup the wing box is clamped at the root and loaded at the tip with a tip clamp. In the model few stringers are missing, those will be added later.

Thanks for your help

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