Hi
I had a questiones about the operation of the Riley damping command in Opensees.
First, how does the Rayleigh Damping Command affect the damping in any structural mode?
Second, can the Rayleigh Damping Command be set to affect only certain modes of the structure?
Any help is greatly appreciated
I wish you all the best
Rayleigh damping is defined as a linear combination, i.e.
D ='alpha M + beta K
also known as "Bequemlichkeitshypothese".
The mode shapes of the undamped system simultaneously decouples M, D and K. That means that all modes are damped by using this approach.
You might consider modal damping if only a subset of modes should be damped.
hi
i completely serch about Rayleigh Damping and it's command in opensees. Unfortunately based on Rayleigh Damping Command coding in opensees and based on Rayleigh Damping defenition, we only can consider two modes parametrs in structure damping in opensees it's also may generate some serious errors in response.
heres some article about errors may happen by not considering all modes parameters.
https://www.orcina.com/webhelp/OrcaFlex ... idance.htm https://www.usbr.gov/ssle/damsafety/Tec ... -07-03.pdf
for knowing Rayleigh Damping and it's command three article mainly helped me which i share these with you
Finley A. Charney, "Unintended Consequences of Modeling Damping in Structures", J. Struct. Engrg. Volume 134, Issue 4, pp. 581-592 (April 2008)
Petrini, Lorenza , Maggi, Claudio , Priestley, M. J. Nigel and Calvi, G. Michele (2008) "Experimental Verification of Viscous Damping Modeling for Inelastic Time History Analyzes", Journal of Earthquake Engineering, 12:S1, pp. 125 — 145
Hall, J. F.(2006) "Problems encountered from the use (or misuse) of Rayleigh damping," Earthquake Engineering and Structural Dynamic, 35, 525–545
i hope i helpd.
wish you best
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