Mode Damping

The damping table defines the critical damping ratio for the given modes of modal dynamic analysis. It is used by harmonic analysis, time history analysis and footfall induced vibration analysis when the damping ratios for some modes need to be defined individually.

Definition

Name

The name is used only as a label for this damping table definition.

Default Damping

If damping ratios of any modes have not been defined in this module, the default damping ratio is used for those modes in harmonic analysis, time-history analysis and footfall analysis.

Description

Damping table consists of a series pair of data that gives the mode number of modal dynamic analysis and its corresponding total critical damping ratio. The description is a string in the form (m1,d1) (m2,d2) (m3,d3) ... to describe each pair of the mode and damping ratio. The description can be typed directly in the table or open the wizard to input the mode and damping ratio numerically.

Mode damping curves can be exported and imported as text (.txt or .csv) files.