Robot structural analysis_Generate model destroys calculation

[severin.wolff]

Hello,

my model did work and the results from the calculation were right. Then I went from calculation methods to structural model and generated a calculation model from that:

Afterwards the calculation went completely wrong. There were moment(My) forces where a release without moment bearing was defined:

Before, everything was alright and it seems afterwards the software is not more able to do a normal clalculation for the whole structure.(Even levels below without defined releases were affected, so there was also this picture with the moment like a triangle).

My question: Is there a possibility to undo this step? The normal way to undo steps did not work..

Furthermore what is the problem?

See model attached.

Thank you in advance!

[okapawal]

Hi @severin.wolff 

I guess you might have changed something in your model, then after the generation the results are not as expected.

You have non-linear analysis due to tension only elements.  The calculations do not converge so the results are incorrect which is reported in multiply errors.

You should correct couple issues in the model.

1. Bracing elements (19, 20) cuts each other and create instable chain in node (17)

Turn off elements 19 and 20 from model generation, in order not to split them.

2.  There are excessive releases on members.  They can simply rotate around their axis.

Change 'Gelenking-Gelenking' release label definition, switching off the Rx rotation release at the begging or end.

Actually, you don't need to apply releases on Truss elements, they are treated as pinned already.

3. Similar for the columns 1to4, they rotate around their axis.  They are based on pinned supports and all adjacent elements heave pinned releases.

You may block RZ rotation on 'Basis' support label.

And voila