BeamEndContact3D

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This command is used to construct a BeamEndContact3D element object.

element BeamEndContact3D $eleTag $iNode $jNode $sNode $lNode $radius $gTol $fTol <$cFlag$>

$eleTag	unique integer tag identifying element object
$iNode	master node from the beam
$jNode	the remaining node on the beam element with $iNode
$sNode	slave node
$lNode	Lagrange multiplier node
$radius	radius of circular beam associated with beam element
$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 BeamEndContact3D element is a node-to-surface contact element which defines a normal contact interface between the end of a beam element and a separate body. The first master node ($iNode) is the beam node which is at the end of the beam (i.e. only connected to a single beam element), the second node ($jNode) is the remaining node on the beam element in question. The slave node is a node from a second body. The Lagrange multiplier node is required to enforce the contact condition. This node should not be shared with any other element in the domain.

The BeamEndContact3D element enforces a contact condition between a fictitious circular plane associated with a beam element and a node from a second body. The normal direction of the contact plane coincides with the endpoint tangent of the beam element at the master beam node ($iNode). The extents of this circular plane are defined by the radius input parameter. The master beam node can only come into contact with a slave node which is within the extents of the contact plane. There is a lag step associated with changing between the 'in contact' and 'not in contact' conditions.

This element was developed for use in establishing a contact condition for the tip of a pile modeled as using beam elements and the underlying soil elements in three-dimensional analysis.

NOTE:

1. The BeamContact3D element does not use a material 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. masterforce - returns the reactions (forces and moments) acting on the master node.

EXAMPLE: BeamEndContact3D element with tag 1, and connectivity with nodes 1, 2, 3, and 4

element BeamEndContact3D 1  1 2 3 4  0.25 1.0e-10 1.0e-10 0

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

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