Modal analysis details chart

This dialog is accessible from the View > New chart view > Mode details menu command. This allows the user to plot various modal properties as a function of mode number.

Task

This identifies the task from which the results are to be extracted. This must be either a modal or Ritz analysis, or a response spectrum analysis.

Output option

The output from this is a bar chart with the result as a function of mode. The options that can be output are selected from:

• Participation factor
• Rotational participation factor
• Effective mass
• Effective inertia

And if the task is a response spectrum task:

• Modal multiplier
• Spectral acceleration
• Elastic base shear

Participation factors and effective mass/inertia are plotted for all three directions (X, Y and Z). The modal multiplier, spectral acceleration and elastic base shear are plotted for each response case.