We provide hints and tips to help you get started with the basic program RFEM.
During the calculation, I get an error message in RFEM with the Error No. 1639, or in RSTAB with the Error No. 1640 "Member No. XY | Member hinges No. YZ are freely rotable about the x-axis. Please check this in Table 1.17 (or 1.7 in RSTAB) or another related table." How can I solve this problem?
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During the calculation, I get an error message in RFEM with the Error No. 1639, or in RSTAB with the Error No. 1640 "Member No. XY | Member hinges No. YZ are freely rotable about the x-axis. Please check this in Table 1.17 (or 1.7 in RSTAB) or another related table." How can I solve this problem?Answer
In fact, this error message only appears if a member hinge that allows a rotation about the local x‑axis has been assigned to a member at both ends. Thus, the member can rotate freely about its own axis and is therefore unstable.Assign a new release to one of the member ends where the degree of freedom φx is not hinged.
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Dlubal FAQ Error 1639 Error 1640 Freely rotating X-axis Member hinge Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
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