Cross Bracing problems!

[Anonymous]

Hi, 

I'm designing a structure which requires cross bracing. The structure seemed to be verified at every stage until I introduced cross bracing. When I analyse the structure I have been getting the various warnings and errors:

1. No convergence of nonlinear problem.
2. Matrix is not positive definite - the critical load may have been exceeded
3. Instability at nodes

I have looked through previous threads and solved problems and found that I should be analysis in a 'Non-Linear' way once bracing is introduced but still can't shift the warnings. 

Would it be possible to have a look at my model and help me with bracing members (tension bars)?

Kind Regards,

Sabir

Please see model attached.

[Artur.Kosakowski]

Try to delete all releases and then apply them in steps checking the results.

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