RF-/STEEL AISC Mode Shapes

Tips & Tricks

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In RF- / STEEL AISC, the mode shapes of sets of members can be displayed graphically in a separate window after the calculation. To do this, select the relevant set of members in the results window and click the [Mode Shapes] button (see Figure).

The mode shapes of the sets of members are generated automatically when the critical load factor α cr is calculated. To determine this factor, an internal planar structural model with four degrees of freedom is created on each node. Then, an eigenvalue analysis is performed to find the governing stability conditions. In addition, the factor α cr determines the ideal critical loadings elastic moment M cr .

The mode shape can be displayed in a graphically increased mode by using the display factor.

The mode shapes are not available in numerical form.

Keywords

Mode shape Set of members Eigenvalue Eigenvalue analysis critical load Ideal branching moment

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Price of First License
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Price of First License
1,480.00 USD