BeamColumnJoint
This command is used to construct a two-dimensional beam-column-joint element object. The element may be used with both two-dimensional and three-dimensional structures; however, load is transferred only in the plane of the element.
element beamColumnJoint $eleTag $Nd1 $Nd2 $Nd3 $Nd4 $Mat1
$Mat2 $Mat3 $Mat4 $Mat5 $Mat6 $Mat7 $Mat8 $Mat9 $Mat10 $Mat11 $Mat12
$Mat13 <$eleHeightFac $eleWidthFac>
Tag
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unique element object tag |
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four nodes |
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uniaxial material tag for left bar-slip spring at node 1 |
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uniaxial material tag for right bar-slip spring at node 1 |
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uniaxial material tag for interface-shear spring at node 1 |
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uniaxial material tag for lower bar-slip spring at node 2 |
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uniaxial material tag for upper bar-slip spring at node 2 |
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uniaxial material tag for interface-shear spring at node 2 |
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uniaxial material tag for left bar-slip spring at node 3 |
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uniaxial material tag for right bar-slip spring at node 3 |
Mat9
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uniaxial material tag for interface-shear spring at node 3 |
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uniaxial material tag for lower bar-slip spring at node 4 |
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uniaxial material tag for upper bar-slip spring at node 4 |
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uniaxial material tag for interface-shear spring at node 4 |
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uniaxial material tag for shear-panel |
eleHeightFac
|
floating point value (as a ratio to the total height of the element) to be considered for determination of the distance in between the tension-compression couples (optional, default: 1.0) |
eleWidthFac
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floating point value (as a ratio to the total width of the element) to be considered for determination of the distance in between the tension-compression couples (optional, default: 1.0) |

Examples
BeamColumnJointExample - the original file (has some errors)
BeamColumnJointExample_Corrected (corrected by Vesna Terzic)
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)
Code Developed by: Nilanjan Mitra, Cal Poly