Peter, I could not find the problem that is not converging. But there is any problem with the joint, see the picture below. I do not understand how you could converge and me not.
The first warning is: Although the solution failed to solve completely at all time points, partial results at some points have been able to be solved. Refer to Troubleshooting in the Help System for more details.
The second: The unconverged solution (identified as Substep 999999) is output for analysis debug purposes. Results at this time should not be used for any other purpose.
The third: The solution failed to solve completely at all time points. Restart points are available to continue the analysis.
The fourth: Element 6966 located in Body "VIGA 3" (and maybe other elements) has become highly distorted. You may select the offending object and/or geometry via RMB on this warning in the Messages window. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). You may need to improve your mesh to obtain elements with better aspect ratios. Also consider the behavior of materials, contact pairs, and/or constraint equations. If this message appears in the first iteration of first substep, be sure to perform element shape checking. Named Selections for the offending element can be created via the Identify Element Violations property on the Solution Information Object.
Do you have any idea what maybe the problem?
Thank you, very much!!