3.1.10.68. FPBearingPTV Element

This command constructs a single friction pendulum bearing element with friction coefficient that depends on sliding velocity; axial pressure; and temperature at the sliding surface. Use with -ndm 3 -ndf 6. For triple pendulum systems with heating see TripleFrictionPendulumX Element.

element FPBearingPTV $eleTag $iNode $jNode $MuRef $IsPressureDependent $pRef $IsTemperatureDependent $Diffusivity $Conductivity $IsVelocityDependent $rateParameter $ReffectiveFP $Radius_Contact $kInitial $matP $matT $matMy $matMz $x1 $x2 $x3 $y1 $y2 $y3 $shearDist $doRayleigh $mass $iter $tol $unit

Argument	Type	Description
$eleTag	integer	unique element tag
$iNode $jNode	integer	end nodes
$MuRef	float	reference coefficient of friction at reference pressure and 20 C
$IsPressureDependent	integer	1 if friction depends on instantaneous axial pressure
$pRef	float	reference axial pressure
$IsTemperatureDependent	integer	1 if friction depends on temperature at sliding surface
$Diffusivity	float	thermal diffusivity of steel
$Conductivity	float	thermal conductivity of steel
$IsVelocityDependent	integer	1 if friction depends on sliding velocity
$rateParameter	float	exponent controlling friction-velocity curve shape
$ReffectiveFP	float	effective radius of curvature of sliding surface
$Radius_Contact	float	radius of contact area at sliding surface
$kInitial	float	lateral stiffness before sliding begins
$matP $matT $matMy $matMz	integer	uniaxial material tags for axial; torsion; and rocking directions
$shearDist	float	shear distance from iNode as fraction of element length
$doRayleigh	integer	1 to include Rayleigh damping contribution from bearing
$mass	float	element mass
$iter $tol	integer float	maximum equilibrium iterations and convergence tolerance
$unit	integer	unit system tag (1: N-m-s-C; 2: kN-m-s-C; 3: N-mm-s-C; 4: kN-mm-s-C; 5-8: imperial variants)

Note

1. Element recorders with Temperature, FrictionFactors, and MuAdjusted return temperature; friction factor history; and adjusted coefficient of friction.

2. Valid standard Element Recorder queries include force, localForce, basicForce, localDisplacement, and basicDisplacement.

Example

1. Tcl Code

element FPBearingPTV 1 1 2 0.06 1 5.0e7 1 4.44e-6 18.0 1 100.0 2.2352 0.2 500.0 1 2 3 4 0.0 0.0 1.0 1.0 0.0 0.0 0.0 0 0.0 100 1.0e-8 1

2. Python Code

element('FPBearingPTV', 1, 1, 2, 0.06, 1, 5.0e7, 1, 4.44e-6, 18.0, 1, 100.0,
        2.2352, 0.2, 500.0, 1, 2, 3, 4, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0, 0.0, 100, 1.0e-8, 1)

Code developed by: Manish Kumar, University at Buffalo, SUNY