4.2.8.1. Tri31 Element¶
This command is used to construct a constant strain triangular element (Tri31) which uses three nodes and one integration points.
- element('Tri31', eleTag, *eleNodes, thick, type, matTag, <pressure, rho, b1, b2>)
eleTag
(int)unique element object tag
a list of three element nodes in counter-clockwise order
thick
(float)element thickness
type
(str)string representing material behavior. The type parameter can be either
'PlaneStrain'
or'PlaneStress'
matTag
(int)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 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.
See also