FourNodeQuad

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

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.

Examples

Code Developed by: Micheal Scott, Oregon State