Joint2D Element

• Command_Manual
  • Tcl Commands
  • Modeling_Commands
    • model
    • uniaxialMaterial
    • ndMaterial
    • frictionModel
    • section
    • geometricTransf
    • element
    • node
    • sp commands
      • fix
      • fixX
      • fixY
      • fixZ
    • mp commands
      • equalDOF
      • rigidDiaphragm
      • rigidLink
    • timeSeries
    • pattern
    • mass
    • block commands
      • block2D
      • block3D
    • region
    • rayleigh
  • Analysis Commands
    • constraints Command
    • numberer Command
    • system Command
    • test Command
    • algorithm Command
    • integrator Command
    • analysis Command
    • eigen Command
    • analyze Command
  • Output Commands
    • recorder
    • record
    • print
    • printA
    • logFile
    • RealTime_Output_Commands
  • Misc Commands
    • eleResponse Command
    • getTime Command
    • getEleTags Command
    • getNodeTags
    • loadConst Command
    • nodeCoord Command
    • nodeDisp Command
    • nodeVel Command
    • nodeAccel Command
    • nodeEigenvector Command
    • nodeBounds
    • print Command
    • remove Command
    • reset Command
    • testIter
    • testNorms
    • wipe Command
    • exit Command
  • DataBase Commands
    • Template:DataBaseCommandsMenu

---

This command is used to construct a two-dimensional beam-column-joint element object. The two dimensional beam-column joint is idealized as a parallelogram shaped shear panel with adjacent elements connected to its med-points. The midpoints of the parallelogram are referred to as external nodes. These nodes are the only analysis components that connect the joint element to the surrounding structure.

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

---

$eleTag	unique element object tag
$Nd1 $Nd2 $Nd3 $Nd4	integer tags indicating four external nodes where the joint element is connected to the adjoining beam-column element
$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

NOTES:

1. The nodes must be located such that the main chords bisect. The node tags shall be entered in a clockwise or counter-clockwise order.
   1. In the case that the beam-column element is rigidly framed to the joint, the tag for materials $Mat1 to $Mat4 shall be zero.

---

REFERENCES:

Arash Altoontash, 2004, "Simulation and damage models for performance assessment of reinforced concrete beam-column joints", PhD Dissertation, Stanford University, California, USA. [1]

---

Code Developed by: Arash Altoontash