Rayleigh Damping Command

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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 + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit

rayleigh $alphaM $betaK $betaKinit $betaKcomm

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$nodeTag	integer tag identifying node
$alphaM	factor applied to elements or nodes mass matrix
$betaK	factor applied to elements current stiffness matrix.
$betaKinit	factor applied to elements initial stiffness matrix.
$betaKcomm	factor applied to elements committed stiffness matrix.

NOTE:

The command overwrites any existing damping coeeficients at the Elements and Nodes.

EXAMPLE:

rayleigh 0.01 0.02 0.0 0.0

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Code Developed by: fmk