Velocity and Pressure Dependent Friction

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This command is used to construct a VelPressureDep friction model object.

frictionModel VelPressureDep $frnTag $muSlow $muFast0 $A $deltaMu $alpha $transRate

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$frnTag	unique friction model object tag
$muSlow	coefficient of friction at low velocity
$muFast0	initial coefficient of friction at high velocity
$A	nominal contact area
$deltaMu	pressure parameter calibrated from experimental data
$alpha	pressure parameter calibrated from experimental data
$transRate	transition rate from low to high velocity

EXAMPLES:

frictionModel VelPressureDep 1 0.085 0.163 7.0686 0.05 0.08 0.77

REFERENCES:

[1] Tsopelas P., and Constantinou M. C. (1996). "Experimental Study of FPS System in Bridge Seismic Isolation." Earthquake Eng. and Structural Dynamics, VOL. 25, 65-78.

[2] Constantinou M. C., Tsopelas P., Kasalanati A., and Wolff E. D. (1999). Property Modification Factors for Seismic Isolation Bearings. Technical Report MCEER-99-0012, University of Buffalo, Buffalo, New York.

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Code Developed by: Andreas Schellenberg, University of California, Berkeley.