Rayleigh Damping Command: Difference between revisions
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| '''$alphaM ''' || factor applied to elements or nodes mass matrix | | '''$alphaM ''' || factor applied to elements or nodes mass matrix | ||
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NOTE: | NOTE: | ||
#The command overwrites any existing damping coeeficients at the Elements and Nodes. | #The command overwrites any existing damping coeeficients at the Elements and Nodes. | ||
# The following paper is something that you should read if you are new to the damping and nonlinear analysis. Finley A. Charney, "Unintended Consequences of Modeling Damping in Structures", J. Struct. Engrg. Volume 134, Issue 4, pp. 581-592 (April 2008) [http://dx.doi.org/10.1061/(ASCE)0733-9445(2008)134:4(581) DOI] | |||
# The following paper is something that you should read if you are new to the damping and nonlinear analysis. Finley A. Charney, "Unintended Consequences of Modeling Damping in Structures", J. Struct. Engrg. Volume 134, Issue 4, pp. 581-592 (April 2008) | # Other useful papers to read: | ||
## 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 [http://www.tandfonline.com/doi/abs/10.1080/13632460801925822 DOI] | |||
## Hall, J. F.(2006) "Problems encountered from the use (or misuse) of Rayleigh damping," Earthquake Engineering and Structural Dynamic, 35, 525–545 [http://onlinelibrary.wiley.com/doi/10.1002/eqe.541/abstract DOI] | |||
EXAMPLE: | EXAMPLE: | ||
Latest revision as of 23:35, 3 January 2013
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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 |
| $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.
- The following paper is something that you should read if you are new to the damping and nonlinear analysis. Finley A. Charney, "Unintended Consequences of Modeling Damping in Structures", J. Struct. Engrg. Volume 134, Issue 4, pp. 581-592 (April 2008) DOI
- Other useful papers to read:
- 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 DOI
- Hall, J. F.(2006) "Problems encountered from the use (or misuse) of Rayleigh damping," Earthquake Engineering and Structural Dynamic, 35, 525–545 DOI
EXAMPLE:
rayleigh 0.01 0.02 0.0 0.0
Code Developed by: fmk