M. To evaluate damping for modes
To instruct the program to evaluate the modal damping values from the first two
STAAD.Pro also has a similar method available for
calculating the modal damping when provided the massproportional damping
coefficient, α and the stiffnessproportional damping coefficient, β. This
method must be input using the
STAAD.Pro Editor.

On the
Loading ribbon tab, select the
Modal Damping tool in the
Dynamic Specifications group.
The Modal Damping dialog opens.  Select the Evalute option.

Type
Min and
Max values to evaluate damping values for each
mode.
The minimum damping value is used for the first two modes. This is also used to evaluate the damping coefficients for subsequent modes based on the first two modal frequencies. If any evaluated damping is greater than the specified maximum value, then the maximum damping is used instead. Refer to Evaluate Damping for additional details.
 Click OK.