When you set your beams to have "no torsion", you are really setting them to have no "twist" (Mxy).

Twist is only one component of torsion. Torsion is a moment that in RAM Concept is measured about the centroid point of the cross section. The z-coordinate of this centroid is the mathematical centroid elevation of the cross section, the x- and y- coordinates of the centroid are the centre of the "core" portion of the centroid.

The vertical shear in the cross section will create torsion unless it is centred upon the centroid. In an edge beam, the vertical shear at the ends must be centered on the column, or there must be torsion to maintain equilibrium.