Quad Element

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This command is used to construct a FourNodeQuad element object which uses a bilinear isoparametric formulation.

element quad $eleTag $iNode $jNode $kNode $lNode $thick $type $matTag <$pressure $rho $b1 $b2>

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$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
$type	string representing material behavior. The type parameter can be either "PlaneStrain" or "PlaneStress."
$matTag	tag of nDMaterial
$pressure	surface pressure (optional, default = 0.0)
$rho	element mass density (per unit volume) from which a lumped element mass matrix is computed (optional, default=0.0)
$b1 $b2	constant body forces defined in the isoparametric domain (optional, default=0.0)

NOTE:

1. Consistent nodal loads are computed from the pressure and body forces.
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.

EXAMPLE:

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Code Developed by: Micheal Scott, Oregon State