A single-span beam consisting of several apparently straight members receives small torsional moments in the load case 'Self-weight'. Why?

Answer

Most likely, there is an inaccuracy in the modeling, which has to be checked as follows:

  • Set the view in the member direction, then zoom in
Figure 02 - View in Member Direction

  • Select all existing nodes that should lie on the same line: If the respective coordinates in the transverse direction do not correspond to the member axis, the corresponding field of the coordinate is empty and there is a deviation
Figure 03 - Checking the Common Coordinate in Transversal Direction

Keywords

Torsion Torsional moment Implausible Inexplicable Single-span beam

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