Bbar Plane Strain Quadrilateral Element

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This command is used to construct a four-node quadrilateral element object, which uses a bilinear isoparametric formulation along with a mixed volume/pressure B-bar assumption. This element is for plane strain problems only.

element bbarQuad $eleTag $iNode $jNode $kNode $lNode $thick $matTag

$eleTag unique element object tag
$iNode $jNode $kNode $lNode four nodes defining element boundaries, input in counter-clockwise order around the element.
$thick element thickness
$matTag tag of nDMaterial


  1. PlainStrain only.
  2. The valid queries to a Quad element when creating an ElementRecorder object are 'forces', 'stresses,' and 'material $matNum matArg1 matArg2 ...' Where $matNum refers to the material object at the integration point corresponding to the node numbers in the isoparametric domain.


Code Developed by: Edward Love, Sandia National Laboratories