BeamContact2D: Difference between revisions

From OpenSeesWiki
Jump to navigation Jump to search
No edit summary
No edit summary
Line 11: Line 11:
|  style="width:150px" | '''$eleTag ''' || unique integer tag identifying element object
|  style="width:150px" | '''$eleTag ''' || unique integer tag identifying element object
|-
|-
|  '''$iNode $jNode ''' || master nodes
|  '''$iNode $jNode ''' || master nodes (-ndm 2 -ndof 3)
|-
|-
|  '''$sNode ''' || slave node
|  '''$sNode ''' || slave node (-ndm 2 -ndof 2)
|-
|-
|  '''$lNode ''' || Lagrange multiplier node
|  '''$lNode ''' || Lagrange multiplier node (-ndm 2 -ndof 2)
|-
|-
|  '''$matTag ''' || unique integer tag associated with previously-defined nDMaterial object
|  '''$matTag ''' || unique integer tag associated with previously-defined nDMaterial object
Line 36: Line 36:




The BeamContact2D element is a two-dimensional beam-to-node contact element which defines a frictional contact interface between a beam element and a separate body.  The master nodes are the endpoints of the beam element, and 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 BeamContact2D element is a two-dimensional beam-to-node contact element which defines a frictional contact interface between a beam element and a separate body.  The master nodes (3 DOF) are the endpoints of the beam element, and the slave node (2 DOF) is a node from a second body.  The Lagrange multiplier node (2 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.


Under plane strain conditions in 2D, a beam element represents a unit thickness of a wall.  The width is the dimension of this wall in the 2D plane.  This width should be built-in to the model to ensure proper enforcement of the contact condition.  The [[Excavation Supported by Cantilevered Sheet Pile Wall]] practical example provides some further examples and discussion on the usage of this element.
Under plane strain conditions in 2D, a beam element represents a unit thickness of a wall.  The width is the dimension of this wall in the 2D plane.  This width should be built-in to the model to ensure proper enforcement of the contact condition.  The [[Excavation Supported by Cantilevered Sheet Pile Wall]] practical example provides some further examples and discussion on the usage of this element.

Revision as of 19:56, 25 April 2011




This command is used to construct a BeamContact2D element object.

element BeamContact2D $eleTag $iNode $jNode $sNode $lNode $matTag $width $gTol $fTol <$cFlag$>


$eleTag unique integer tag identifying element object
$iNode $jNode master nodes (-ndm 2 -ndof 3)
$sNode slave node (-ndm 2 -ndof 2)
$lNode Lagrange multiplier node (-ndm 2 -ndof 2)
$matTag unique integer tag associated with previously-defined nDMaterial object
$width the width of the wall represented by the beam element in plane strain
$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




The BeamContact2D element is a two-dimensional beam-to-node contact element which defines a frictional contact interface between a beam element and a separate body. The master nodes (3 DOF) are the endpoints of the beam element, and the slave node (2 DOF) is a node from a second body. The Lagrange multiplier node (2 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.

Under plane strain conditions in 2D, a beam element represents a unit thickness of a wall. The width is the dimension of this wall in the 2D plane. This width should be built-in to the model to ensure proper enforcement of the contact condition. The Excavation Supported by Cantilevered Sheet Pile Wall practical example provides some further examples and discussion on the usage of this element.


NOTE:

  1. The BeamContact2D element has been written to work exclusively with the ContactMaterial2D 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 normal and tangential contact forces.
    4. masterforce - returns the reactions (forces and moments) acting on the master nodes.
    5. The BeamContact2D elements are set to consider frictional behavior as a default, but the frictional state of the BeamContact2D 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


EXAMPLES:

BeamContact2D element with tag 1, connectivity with nodes 1, 2, 3, and 4, and material with tag 1

element BeamContact2D 1  1 2 3 4  1  0.5 1.0e-10 1.0e-10 0

Update all of the BeamContact2D elements with tags between 10 and 20 to consider a frictionless interface

setParameter -value 0 -eleRange 10 20 friction

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