Additional Material Damping Form

Additional form: Damping Conversion

Use the options on the Additional Material Damping form to specify damping.

Modal Damping - Damping Ratio edit box. Enter a value for the damping ratio (0 <= r < 1) to be used during a Response Spectrum or Model Time-History load case.
Viscous Proportional Damping - Mass Coefficient and Stiffness Coefficient edit boxes. Enter values for these parameters that will be used during a Direct Integration Time History load case.
Hysteretic Proportional Damping - Mass Coefficient and Stiffness Coefficient edit boxes. Enter values for these parameters that will be used during a Steady State or Power Spectral Density load case.
Make Other Damping Similar button. Clicking this button after entering a value for one of the preceding types of damping will cause the program to automatically calculate damping that would be similar for the various types of analysis. In this way, the "same" damping can be evaluated for different load cases.

After the additional material damping has been specified as part of the material property definition, the additional damping is applied to the model by assigning the material property definition to a selected area(s), frame(s), cable(s), tendon(s) or solid(s).

Access the Additional Material Damping form as follows:

Click the Define menu > Materials command to display the Define Materials form. The Define Materials form also can be accessed by clicking the + (plus) symbol that may appear next to a drop-down list of available materials, such as the Material drop-down list on the Shell Section Data form, or the {Frame Section Type} Data forms.
Check the Show Advanced Properties check box.
Click the Add New Material button to display the Material Property Options form.
Click the Modify/Show Material Properties button to display the Material Property Data form.
Click the Material Damping Properties button to access the Additional Material Damping form.