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Static structural non-linear analysis. Неизвестная ошибка после определённой стадии нагрузки


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На определённой стадии нагрузки происходит неизвестная ошибка. При этом сходимость по нагрузке и перемещениям выполняется. Не понимаю в чём может быть проблема. В solver output пишет предупреждение насчёт элементов, возможно проблема в контактах ещё. Подскажите, пожалуйста, в чём может быть проблема. Задача по выдёргиванию бетонного тела из грунта.

Прикрепляю архив на гугл диске.



An unknown error occurred during solution.  Check the Solver Output on the Solution Information object for possible causes.
The solution failed to solve completely at all time points. Restart points are available to continue the analysis. 
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 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 selective body meshing is not being recorded, so the meshing may not be persistent on an update.  If you want to record the order of the body meshing, please use the Mesh Worksheet to track the meshing steps.  Please see Selective Meshing documentation for more details.


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