Forum for OpenSees users to post questions, comments, etc. on the use of the OpenSees interpreter, OpenSees.exe
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pp_0928
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by pp_0928 »
Hi all
In rayleigh damping, D = $alphaM * M + $betaK * Kcurrent +$betaKinit * Kinit + $betaKcomm * KlastCommit
What do these three stiffness mean? Is it for nonlinear? If it's linear, are these 3 coefficient the same?
In Chopra, C=a0*m+a1*k, what's this k for? Initial? Committed or current?
Many thanks!
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fmk
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by fmk »
The 3 factors are for current stiffness, last committed stiffness and initial stiffness.
The text book only deals with elastic damping problems, in which case they are all equal.
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pp_0928
- Posts: 13
- Joined: Tue Oct 21, 2008 8:22 pm
- Location: irvine
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by pp_0928 »
[quote="fmk"]The 3 factors are for current stiffness, last committed stiffness and initial stiffness.
The text book only deals with elastic damping problems, in which case they are all equal.[/quote]
Many thanks for your prompt reply.