Maxwell Material

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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

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$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

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Examples:

[1]	Input parameters:
[2]	Tcl input file for Viscous Damper Calibration
[3]	OpenSees Example of 1-story steel moment frame with a viscous damper

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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)