Answer:
There is probably no support against torsion.
Thus, it is necessary to ensure that either the member elastic foundation (Image 01) or one of the nodal supports (Image 02) can absorb the torsion.
Instability of Continuous Beam with Elastic Foundations
I have modeled a continuous beam with elastic foundations that is stressed by a constant line moment. Why is the message about instability displayed after the calculation?
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