Joint2D Element

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This command is used to construct a two-dimensional beam-column-joint element object. The joint2D element is a useful element for modeling rotational deformability of beam ends.

element Joint2D $eleTag $Nd1 $Nd2 $Nd3 $Nd4 $NdC <$Mat1 $Mat2 $Mat3 $Mat4> $MatC $LrgDspTag

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$eleTag	unique element object tag
$Nd1 $Nd2 $Nd3 $Nd4	integer tags indicating four external nodes of beam-column joint (
$NdC	integer tags indicating the central node of beam-column joint (the tag is used to generate the internal node, thus, the node should not exist in the domain)
$Mat1	uniaxial material tag for rotational spring at node 1 (optional)
$Mat2	uniaxial material tag for rotational spring at node 2 (optional)
$Mat3	uniaxial material tag for rotational spring at node 3 (optional)
$Mat4	uniaxial material tag for rotational spring at node 4 (optional)
$MatC	uniaxial material tag for rotational spring of the central node
$LrgDspTag	tag for the large deformation condition:
0 - for small deformations and constant geometry
1 - for large deformations and time varying geometry
2 - for large deformations ,time varying geometry and length correction

EXAMPLE:

BeamColumnJointExample

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REFERENCES:

Lowes, Laura N.; Mitra, Nilanjan; Altoontash, Arash A beam-column joint model for simulating the earthquake response of reinforced concrete frames PEER-2003/10 Pacific Earthquake Engineering Research Center, University of California, Berkeley 2003 59 pages (400/P33/2003-10)

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Code Developed by: Nilanjan Mitra, Cal Poly