3.1.10.56. ElastomericBearingBouc-Wen Element

This command constructs a two-node elastomeric bearing element with Bouc-Wen shear hysteresis (2D unidirectional or 3D coupled). Non-shear directions use user-defined uniaxialMaterial Command objects.

element elastomericBearingBoucWen $eleTag $iNode $jNode $kInit $qd $alpha1 $alpha2 $mu $eta $beta $gamma -P $matTag -Mz $matTag <-orient $x1 $x2 $x3 $y1 $y2 $y3> <-shearDist $sDratio> <-doRayleigh> <-mass $m> <-iter $maxIter $tol>

element elastomericBearingBoucWen $eleTag $iNode $jNode $kInit $qd $alpha1 $alpha2 $mu $eta $beta $gamma -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
$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
$eta	float	yielding exponent (default 1.0)
$beta	float	first Bouc-Wen shape parameter (default 0.5)
$gamma	float	second Bouc-Wen shape parameter (default 0.5)
$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)
$maxIter $tol	integer float	equilibrium iteration limit and tolerance (optional)

Note

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

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

Example

1. Tcl Code

element elastomericBearingBoucWen 1 1 2 20.0 2.50 0.02 0.0 3.0 1.0 0.5 0.5 -P 1 -Mz 2

2. Python Code

element('elastomericBearingBoucWen', 1, 1, 2, 20.0, 2.50, 0.02, 0.0, 3.0, 1.0, 0.5, 0.5, '-P', 1, '-Mz', 2)

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