NOTE: We recommend using at least a small amount of damping for modal and direct-integration cases, even when dampers are present in the model.
Damping is a property of material which influences dynamic response. A certain type of damping is available for each type of load case. Within all load cases of a certain type, damping is applied consistently, though additional damping may be added to individual load cases.
- Modal damping is used for response-spectrum and modal time-history analyses. Material modal damping, also known as composite modal damping, is weighted according to element and modal stiffness. For each material, users specify a material modal damping ratio r, where 0 <= r < 1, which relates to the damping ratio of each mode.
- Viscous-proportional damping is used for direct-integration time-history analysis. This property is proportional to mass and stiffness.
- Hysteretic-proportional damping, also mass- and stiffness-proportional, is used for steady-state and power-spectral-density analyses. Additional information on each of these damping types may be found in the
Unknown macro: {new-tab-link}Analysis Reference Manual (Material Damping, page 78).
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