Velocity and Pressure Dependent Friction

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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 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.

frictionModel VPDependent $frnTag $iNode $jNode $ke $fy $alpha -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-mass $m>

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$frnTag	unique friction model object tag
$iNode $jNode	end nodes
$ke	initial elastic stiffness
$fy	yield strength
$alpha	post yield stiffness ratio
-P $matTag	tag associated with previously-defined UniaxialMaterial in axial direction
-T $matTag	tag associated with previously-defined UniaxialMaterial in torsional direction
-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:

element elastomericBearing 1 1 2 20.0 2.50 0.02 -P 1 -Mz 2;

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