View source for 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.

{| 
| style="background:yellow; color:black; width:800px" | '''element tri31 $eleTag $iNode $jNode $kNode $thick $type $matTag <$pressure $rho $b1 $b2>'''
|}

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{|
|  style="width:150px" | '''$eleTag''' || unique element object tag
|-
|'''$iNode $jNode $kNode''' || three nodes defining element boundaries, input in counter-clockwise order around the element.
|-
|'''$thick''' || element thickness 
|-
| '''$type''' || string representing material behavior. The type parameter can be either "PlaneStrain" or "PlaneStress."
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| '''$matTag''' || tag of nDMaterial
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| '''$pressure''' || surface pressure (optional, default = 0.0)
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| '''$rho''' || element mass density (per unit volume) from which a lumped element mass matrix is computed (optional, default=0.0)
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| '''$b1 z$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.

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Code Developed by: <span style="color:blue"> [http://www.roozbehgm.com/ Roozbeh G. Mikola], UC Berkeley</span> and <span style="color:blue"> [http://www.ce.berkeley.edu/~sitar/ N. Sitar], UC Berkeley</span>