Quadrilateral Element
This command is used to construct a FourNodeQuad element object which uses a bilinear isoparametric formulation.
Command
element quad $eleTag $iNode $jNode $kNode $lNode $thick $type $matTag <$pressure $rho $b1 $b2>
| Argument | Type | Description |
|---|---|---|
| $eleTag | integer | unique element object tag |
| $iNode $jNode $kNode $lNode | integer four nodes defining element boundaries | input in counter-clockwise order around the element. |
| $thick | float | element thickness |
| $type | string | string representing material behavior. The type parameter can be either "PlaneStrain" or "PlaneStress." |
| $matTag | integer | tag of nDMaterial |
| $pressure | float | surface pressure (optional: default = 0.0) |
| $rho | float | element mass density (per unit volume) from which a lumped element mass matrix is computed (optional: default=0.0) |
| $b1 $b2 | float | constant body forces defined in the isoparametric domain (optional: default=0.0) |
Note
The optional arguments must either be all specified or none specified.
Consistent nodal loads are computed from the pressure and body forces.
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
The following example constructs a quad element for use in a plane stress problem with tag 1 between nodes 1, 2, 3, 4 with an nDMaterial of tag 1.
- Tcl Code
element stdBrick 1 1 2 3 4 "PlaneStress" 1
- Python Code
element('quad',1,1,2,3,4, 'PlaneStress', 1, b1, b2, b3)
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