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Damping
This command is used to assign damping to all previously-defined elements and nodes. When using rayleigh damping in OpenSees, the damping matrix for an element or node, D is specified as a combination of stiffness and mass-proportional damping matrices:
D = alphaM * M + [betaKcurrent * Kcurrent] + [betaKinit * Kinit] + [betaKcomm * KlastCommit]
xDamp = 0.05; # 5% damping ratio
alphaM = 0.00; # M-prop damping; alphaM*M
betaKcurrent = 0.00; # K-proportional damping; beatKcurr*KCurrent
betaKinit = 0.00; # initial-stiffness proportional damping; beatKinit*Kinit
betaKcomm = 2.*xDamp/omega; # K-prop. damping parameter; betaKcomm*KlastCommitt
Inputs
| Name | ID | Description | Type |
|---|---|---|---|
| AlphaM | AlphaM | factor applied to elements or nodes mass matrix | Number |
| BetaKCurr | BetaKCurr | factor applied to elements current stiffness matrix. | Number |
| BetaKInit | BetaKInit | factor applied to elements initial stiffness matrix. | Number |
| BetaKComm | BetaKComm | factor applied to elements committed stiffness matrix. | Number |
Outputs
| Name | ID | Description | Type |
|---|---|---|---|
| Damping | Damping | Damping | Generic Data |
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