RF-/STEEL AISC Mode Shapes

Tips & Tricks

After running an analysis in RF-/STEEL AISC, the mode shapes for sets of members can be viewed graphically in a separate window. Select the relevant set of members in the result window and click the [Mode Shapes] button.

The mode shapes for sets of members are created automatically when calculating the critical load factor, αcr. To determine this factor, an internal planar framework model is created with four degrees of freedom at each node. An eigenvalue analysis is then run to find the governing stability conditions. The αcr factor further determines the set of member’s elastic critical moment for lateral-torsional buckling, Mcr.

The mode shapes are not available in numerical form. Use the Display factor to display the mode shape in an exaggerated graphical representation.


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