BeamContact3D

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This command is used to construct a BeamContact3D element object.

element BeamContact3D $eleTag $iNode $jNode $sNode $lNode $radius $crdTransf $matTag $gTol $fTol <$cFlag$>

$eleTag	unique integer tag identifying element object
$iNode $jNode	master nodes (-ndm 3 -ndof 6)
$sNode	slave node (-ndm 3 -ndof 3)
$lNode	Lagrange multiplier node (-ndm 3 -ndof 3)
$radius	constant radius of circular beam associated with beam element
$crdTransf	unique integer tag associated with previously-defined geometricTransf object
$matTag	unique integer tag associated with previously-defined nDMaterial object
$gTol	gap tolerance
$fTol	force tolerance
$cFlag	optional initial contact flag
	$cFlag = 0 >> contact between bodies is initially assumed (DEFAULT)
	$cFlag = 1 >> no contact between bodies is initially assumed

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The BeamContact3D element is a three-dimensional beam-to-node contact element which defines a frictional contact interface between a beam element and a separate body. The master nodes (6 DOF) are the endpoints of the beam element, and the slave node (3 DOF) is a node from a second body. The Lagrange multiplier node (3 DOF) is required to enforce the contact condition. Each contact element should have a unique Lagrange multiplier node. The Lagrange multiplier node should not be fixed, otherwise the contact condition will not work.

NOTE:

1. The BeamContact3D element has been written to work exclusively with the ContactMaterial3D nDMaterial object.
2. The valid recorder queries for this element are:
   1. force - returns the contact force acting on the slave node in vector form.
   2. frictionforce - returns the frictional force acting on the slave node in vector form.
   3. forcescalar - returns the scalar magnitudes of the single normal and two tangential contact forces.
   4. masterforce - returns the reactions (forces only) acting on the master nodes.
   5. mastermoment - returns the reactions (moments only) acting on the master nodes.
   6. masterreaction - returns the full reactions (forces and moments) acting on the master nodes.
   7. The BeamContact3D elements are set to consider frictional behavior as a default, but the frictional state of the BeamContact3D element can be changed from the input file using the setParameter command. When updating, value of 0 corresponds to the frictionless condition, and a value of 1 signifies the inclusion of friction. An example command for this update procedure is provided below

EXAMPLE:

BeamContact3D element with tag 1, connectivity with nodes 1, 2, 3, and 4, geomTransf object with tag 1, and material with tag 1

element BeamContact3D 1  1 2 3 4  0.25  1 1  1.0e-10 1.0e-10 0

Update all of the BeamContact3D elements with tags between 10 and 20 to consider a frictionless interface

setParameter -value 0 -eleRange 10 20 friction

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Code Developed by: Kathryn Petek, Pedro Arduino, & Peter Mackenzie-Helnwein, at the University of Washington

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