Maxwell Material: Difference between revisions
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| Assume a viscous damper with axial stiffness K=150.0kN/mm, viscous parameter C = 100.0kN/(mm/s)^a, an exponent a=0.3 and length equal to 5000mm. The input parameters for the material should be as follows: | | Assume a viscous damper with axial stiffness K=150.0kN/mm, viscous parameter C = 100.0kN/(mm/s)^a, an exponent a=0.3 and length equal to 5000mm. The input parameters for the material should be as follows: | ||
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| # matTag ''K'' ''C'' ''a'' '' L'' | | # matTag ''K'' ''C'' ''a'' '' L'' | ||
|- | |||
| uniaxialMaterial Maxwell 1 150.0 100.0 0.30 5000.0 | | uniaxialMaterial Maxwell 1 150.0 100.0 0.30 5000.0 | ||
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| '''[2]''' || Tcl input file for Viscous Damper Calibration | | '''[2]''' || Tcl input file for Viscous Damper Calibration | ||
Revision as of 17:43, 15 February 2011
- Command_Manual
- Tcl Commands
- Modeling_Commands
- model
- uniaxialMaterial
- ndMaterial
- frictionModel
- section
- geometricTransf
- element
- node
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- mp commands
- timeSeries
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- region
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- Analysis Commands
- Output Commands
- Misc Commands
- DataBase Commands
This command is used to construct a Maxwell material (linear spring and nonlinear dashpot in series). The Maxwell material simulates the hysteretic response of viscous dampers.
| uniaxialMaterial Maxwell $matTag $K $C $a $L |
| $matTag | integer tag identifying material |
| $K | Elastic stiffness of linear spring (to model elastic stiffness of viscous damper) |
| $C | Viscous parameter of damper |
| $a | Viscous damper exponent |
| $L | Viscous damper length |
Examples:
| [1] | Input parameters: | |
| Assume a viscous damper with axial stiffness K=150.0kN/mm, viscous parameter C = 100.0kN/(mm/s)^a, an exponent a=0.3 and length equal to 5000mm. The input parameters for the material should be as follows: | ||
| # matTag K C a L | ||
| uniaxialMaterial Maxwell 1 150.0 100.0 0.30 5000.0 | ||
| [2] | Tcl input file for Viscous Damper Calibration | |
| [3] | OpenSees Example of 1-story steel moment frame with a viscous damper |
References:
| [1] | Olsson, A.K., and Austrell, P-E., (2001), "A fitting procedure for viscoelastic-elastoplastic material models," Proceedings of the Second European Conference on Constitutive Models for Rubber, Germany, 2001. |
| [2] | Ottosen, N.S., and Ristinmaa, M., (1999). "The mechanics of constitutive modelling, (Numerical and thermodynamical topics)," Lund University,Division of Solid Mechanics, Sweden, 1999. |
Code Developed by : by Dr. Dimitrios G. Lignos (McGill University)