Cross-sectional design situation not positive definite

Dear community,
I am currently working on my term paper and want to consider the BS fire case for a roof structure made of flat cross-laminated timber elements. Due to different constructions regarding the roof and wall, I have different fire protection configurations.
I mistakenly first set the walls in the fire protection configuration to ceiling level, and the project ran.
Afterwards, I noticed the setting error and changed it to walls. Since then, the model no longer runs. I have already watched the "Webinar | Fire Design in Timber Construction with RFEM 6," where this problem is also mentioned.
However, I do not know how to fix it.
I use a single-layer 18mm fire protection cladding on all components. For the interior walls, fire protection cladding is applied on both sides.
I would really appreciate a prompt response from you.




image
Brettsperrholz_Brandbemessung_nicht_pos_definit.rf6 (1.7 MB)
Thank you very much in advance
Linus

Sorry, I found the problem. My 90mm inner wall is not sufficient for 1x18mm per wall side, so the system would fail and deformations of ten thousand mm would occur. Thanks anyway :slight_smile:

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