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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>
$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 (constant) |
$type |
string representing material behavior. Valid options depend on the NDMaterial object and its available material formulations. The type parameter can be either "PlaneStrain" or "PlaneStress." |
$matTag |
tag associated with previously-defined NDMaterial object |
$pressure |
surface pressure (???? sign convention????****) |
$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) |
Consistent nodal loads are computed from the pressure and body forces.
The valid queries to a Quad element when creating an ElementRecorder object are 'force,' 'stiffness,' 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.
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