Velocity and Pressure Dependent Friction: Difference between revisions

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{{CommandManualMenu}}
{{CommandManualMenu}}


This command is used to construct an elastomericBearing element object, which is defined by two nodes. The element can have zero length or the appropriate bearing height. The bearing has unidirectional (2D) or coupled (3D) plasticity properties for the
This command is used to construct a VelPressureDep friction model object.
shear deformations, and force-deformation behaviors defined by UniaxialMaterials in the remaining two (2D) or four (3D) directions. P-Delta moments are equally distributed to the two end-nodes. If the element has non-zero length, the local x-axis is determined from the nodal geometry unless the optional x-axis vector is specified in which case the nodal geometry is ignored and the user-defined orientation is utilized.


{|  
{|  
| style="background:yellow; color:black; width:800px" | '''frictionModel VPDependent $frnTag $iNode $jNode $ke $fy $alpha -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-mass $m>'''
| style="background:lime; color:black; width:800px" | '''frictionModel VelPressureDep $frnTag $muSlow $muFast0 $A $deltaMu $alpha $transRate'''
|}
|}


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|  style="width:150px" | '''$frnTag''' || unique friction model object tag
|  style="width:150px" | '''$frnTag''' || unique friction model object tag
|-
|-
| '''$iNode $jNode''' || end nodes
| '''$muSlow''' || coefficient of friction at low velocity
|-
|-
| '''$ke''' || initial elastic stiffness
| '''$muFast0''' || initial coefficient of friction at high velocity
|-
|-
| '''$fy''' || yield strength
| '''$A''' || nominal contact area
|-
|-
| '''$alpha''' || post yield stiffness ratio
| '''$deltaMu''' || pressure parameter calibrated from experimental data
|-
|-
| '''-P $matTag''' || tag associated with previously-defined UniaxialMaterial in axial direction
| '''$alpha''' || pressure parameter calibrated from experimental data
|-
|-
| '''-T $matTag''' || tag associated with previously-defined UniaxialMaterial in torsional direction
| '''$transRate''' || transition rate from low to high velocity
|-
| '''-My $matTag''' || tag associated with previously-defined UniaxialMaterial in moment direction around local y-axis
|-
| '''-Mz $matTag''' || tag associated with previously-defined UniaxialMaterial in moment direction around local z-axis
|-
| '''$x1 $x2 $x3''' || vector components in global coordinates defining local x-axis (optional)
|-
| '''$y1 $y2 $y3''' || vector components in global coordinates defining local y-axis (optional)
|-
| '''$m''' || element mass (optional, default = 0.0)
|}
|}




EXAMPLES:
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EXAMPLE:
 
frictionModel VelPressureDep 1 0.085 0.163 7.0686 0.05 0.08 0.77
 
 
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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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RELATED TO:


element elastomericBearing 1 1 2 20.0 2.50 0.02 -P 1 -Mz 2;
* [http://opensees.berkeley.edu/wiki/index.php/Flat_Slider_Bearing_Element Flat Slider Bearing Element]
* [http://opensees.berkeley.edu/wiki/index.php/Single_Friction_Pendulum_Bearing_Element Single Friction Pendulum Bearing Element]
* [http://opensees.berkeley.edu/wiki/index.php/Triple_Friction_Pendulum_Element Triple Friction Pendulum Bearing Element]




Latest revision as of 20:06, 18 September 2014



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

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


EXAMPLE:

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.


RELATED TO:


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

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