Dear Dlubal Support Team,
I am contacting you regarding a calculation issue in RFEM 6.
For the Weir Gate steel model, the eigenvalue buckling analysis runs successfully and the buckling modes are calculated. However, when I try to use buckling mode 1 as an imperfection and run the corresponding imperfection case / geometrically nonlinear analysis, the calculation stops with an error. "Please inform the software company and provide it with data about the concerned model."
Model / analysis information:
- Software: RFEM 6.14
- Structure type: Shell/plate structure of a hydraulic steel gate
- Analysis performed: Stability analysis / eigenvalue buckling
- Buckling modes: Successfully calculated
- Critical issue: Imperfection based on buckling mode 1 cannot be calculated
- Problem: The model calculates the modes, but the imperfection case does not solve due to an error
We would also appreciate your recommendation for the correct procedure to perform the buckling / imperfection analysis for this shell structure in RFEM 6.
Attached: RFEM model screenshots of the error/settings.
I can send you model in DM.
Best regards,
Nouman
Click on File → Save as and choose the following settings to reduce the file size:
Prefer not to share the file publicly? No problem – send it to me via direct message: click on my profile picture or user name → Message.
Without having seen the model, however, this could be a known issue: Assigning the imperfections to a load combination from which the underlying buckling configuration was also generated creates a circular reference.
One solution to this problem could be to copy the load combination (or the entire design scenario). Do not assign any imperfections here; instead, generate the buckling figures from these and assign them.