Additional Member Results

The Additional Member Results category in the navigator allows you to graphically display the mode shapes of members and member sets. The mode shapes are not output in the tables.

Additional Member Results – Mode Shapes

Mode Shapes

If the Eigenvalue Method is used to determine the critical moment M_cr or the critical load factor α_crit for the lateral-torsional buckling analysis, the corresponding mode shape is also available as a result.

The mode shapes are related to different criteria:

• By Selected Design Check

The mode shape is displayed specifically for the design selected in the result table. In this case, the design check always refers to a member or member set. The working window displays the mode shape of this object for the load case used in the specific design. This option is suitable for the targeted control of a specific design check.

• By Governing Design Check

The mode shapes that are governing for the stability analysis are displayed for all objects. The graphic thus displays several mode shapes side by side, even though they may occur independently of each other or be based on different load situations. This option is particularly suitable when using visibilities for documenting the results when the mode shapes of the visible objects are displayed.

• By Individual CO

The mode shapes applicable to a specific load combination are displayed for all objects, regardless of whether this load combination is governing for the design. Set the load combination using the list of loads in the toolbar. This option is suitable for checking the plausibility of the specified boundary conditions and nodal supports.

Scaling of eigenmodes

Scaling of Mode Shapes

In the lower section of the navigator, you can select how the dimensionless numerical values of the mode shapes should be scaled to the reference length 1. This method is also referred to as “standardization”.

• |u| = 1

The value of the mode shape vector is scaled to 1. The maximum total displacement |u| is considered.

• max {u_X; u_Y; u_Z; φ_X; φ_Y; φ_Z} = 1

This approach takes into account the entire eigenvector, including the rotational components. The maximum is sought as a reference and this component is then set to 1.