Tri31 Element
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This command is used to construct a constant strain triangular element (Tri31) which uses three nodes and one integration points.
element quad $eleTag $iNode $jNode $kNode $thick $type $matTag <$pressure $rho $b1 $b2> |
$eleTag | unique element object tag |
$iNode $jNode $kNode | three 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) |
$b1 z$b2 | constant body forces defined in the domain (optional, default=0.0) |
NOTE:
- Consistent nodal loads are computed from the pressure and body forces.
- The valid queries to a Tri31 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 domain.