3.1.10.58. SingleFrictionPendulumBearing Element

This command constructs a two-node single concave friction pendulum bearing. The iNode is the concave sliding surface and the jNode is the articulated slider. Shear behavior includes post-yield stiffening from the concave surface and uses a friction model.

element singleFPBearing $eleTag $iNode $jNode $frnMdlTag $Reff $kInit -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-shearDist $sDratio> <-doRayleigh> <-mass $m> <-iter $maxIter $tol>

element singleFPBearing $eleTag $iNode $jNode $frnMdlTag $Reff $kInit -P $matTag -T $matTag -My $matTag -Mz $matTag <-orient <$x1 $x2 $x3> $y1 $y2 $y3> <-shearDist $sDratio> <-doRayleigh> <-mass $m> <-iter $maxIter $tol>

Argument	Type	Description
$eleTag	integer	unique element tag
$iNode $jNode	integer	end nodes (iNode is concave surface)
$frnMdlTag	integer	tag of a previously defined friction model
$Reff	float	effective radius of concave sliding surface
$kInit	float	initial elastic stiffness in local shear direction
$matTag	integer	uniaxial material tag for axial behavior (-P)
$matTag	integer	uniaxial material tag for torsion (-T; 3D only)
$matTag	integer	uniaxial material tag for moment about local y (-My; 3D only)
$matTag	integer	uniaxial material tag for moment about local z (-Mz)
$sDratio	float	shear distance from iNode as fraction of element length (optional; default 0.0)
$m	float	element mass (optional; default 0.0)
$maxIter $tol	integer float	equilibrium iteration limit and tolerance (optional; defaults 20 and 1e-8)

Note

1. The axial uniaxial material is modified for no-tension behavior.

2. For pressure-velocity-temperature dependent friction see FPBearingPTV Element.

3. Valid Element Recorder queries include force, localForce, basicForce, localDisplacement, basicDisplacement, and material $matNum ....

Example

1. Tcl Code

element singleFPBearing 1 1 2 1 34.68 250.0 -P 1 -Mz 2 -orient 0 1 0 -1 0 0

2. Python Code

element('singleFPBearing', 1, 1, 2, 1, 34.68, 250.0, '-P', 1, '-Mz', 2, '-orient', 0, 1, 0, -1, 0, 0)

Code developed by: Andreas Schellenberg, University of California, Berkeley