3.1.10.55. ElastomericBearingPlasticity Element

This command constructs a two-node elastomeric bearing element with coupled shear plasticity (2D) or bidirectional plasticity (3D). Force-deformation in the non-shear directions is defined by user-supplied uniaxialMaterial Command objects. The command name elastomericBearing is an alias for elastomericBearingPlasticity.

element elastomericBearingPlasticity $eleTag $iNode $jNode $kInit $qd $alpha1 $alpha2 $mu -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-shearDist $sDratio> <-doRayleigh> <-mass $m>

element elastomericBearingPlasticity $eleTag $iNode $jNode $kInit $qd $alpha1 $alpha2 $mu -P $matTag -T $matTag -My $matTag -Mz $matTag <-orient <$x1 $x2 $x3> $y1 $y2 $y3> <-shearDist $sDratio> <-doRayleigh> <-mass $m>

Argument	Type	Description
$eleTag	integer	unique element tag
$iNode $jNode	integer	end nodes
$kInit	float	initial elastic stiffness in local shear direction
$qd	float	characteristic strength
$alpha1	float	post-yield stiffness ratio of linear hardening component
$alpha2	float	post-yield stiffness ratio of nonlinear hardening component
$mu	float	exponent of nonlinear hardening component
$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 0.5)
$m	float	element mass (optional; default 0.0)

Note

1. By default the bearing does not contribute to Rayleigh damping. Use -doRayleigh to include it.

2. Specify realistic axial stiffness; extremely large values can cause numerical sensitivity.

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

Example

1. Tcl Code

element elastomericBearingPlasticity 1 1 2 20.0 2.50 0.02 0.0 3.0 -P 1 -Mz 2

2. Python Code

element('elastomericBearingPlasticity', 1, 1, 2, 20.0, 2.50, 0.02, 0.0, 3.0, '-P', 1, '-Mz', 2)

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