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2024-08-01

FAQ 005585 | What is the meaning of the error message "Incompatible calculation options" for members with…

Question:
What is the meaning of the error message "Incompatible calculation options" for members with linear section distribution (tapers)?

Answer:
In RFEM 6 and RSTAB 9, you have the option to assign different cross-sections at the start and end of a member, see the following image.

► Image | FAQ 005585 | Displaying Member with Linear Section Distribution, Timber Material https://www.dlubal.com/en/img/051772

You can define different cross-sections at the member start and member end. The calculation options for both ends of the member need to be identical. Dialog Box | Editing Cross-Section | Main | Options:

► Image | Dialog Box | Editing Cross-Section https://www.dlubal.com/en/img/051777

If there are different options defined at the member ends, this error messages appear.
Example: The "Deactivate shear stiffness" option is defined differently at both member ends:

► Image | Error Message "Incompatible Calculation Options of Sections." https://www.dlubal.com/en/downloads-and-information/examples-and-tutorials/models-to-download/051778

Example: The "Thin-walled model" option is defined differently for a steel beam:

► Image | Dialog Box | Editing Cross-Section https://www.dlubal.com/en/img/051779

This leads to the following error message:

► Image | Error Message due to Different Options Regarding "Thin-Walled Model" https://www.dlubal.com/en/img/051781

For correct modeling, it is necessary to define the same options on both member ends.