Joint2D Element: Difference between revisions
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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 | 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 mid-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. | ||
{| | {| | ||
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| '''$Nd1 $Nd2 $Nd3 $Nd4''' || integer tags indicating four external nodes where the joint element is connected to the adjoining beam-column element | | '''$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) | | '''$NdC''' || integer tags indicating the central node of beam-column joint (the tag is used to generate the internal node, thus, the node should not exist in the domain or be used by any other node) | ||
|- | |- | ||
| '''$Mat1''' || uniaxial material tag for rotational spring at node 1 (optional) | | '''$Mat1''' || uniaxial material tag for interface rotational spring at node 1. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) | ||
|- | |- | ||
| '''$Mat2''' || uniaxial material tag for rotational spring at node 2 (optional) | | '''$Mat2''' || uniaxial material tag for interface rotational spring at node 2. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) | ||
|- | |- | ||
| '''$Mat3''' || uniaxial material tag for rotational spring at node 3 (optional) | | '''$Mat3''' || uniaxial material tag for interface rotational spring at node 3. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) | ||
|- | |- | ||
| '''$Mat4''' || uniaxial material tag for rotational spring at node 4 (optional) | | '''$Mat4''' || uniaxial material tag for interface rotational spring at node 4. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) | ||
|- | |- | ||
| '''$MatC''' || uniaxial material tag for rotational spring of the central node | | '''$MatC''' || uniaxial material tag for rotational spring of the central node that describes shear panel behavior | ||
|- | |- | ||
| '''$LrgDspTag''' || | | '''$LrgDspTag''' || an integer indicating the flag for considering large deformations: | ||
|- | |- | ||
| || 0 - for small deformations and constant geometry | | || 0 - for small deformations and constant geometry | ||
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#The nodes must be located such that the main chords bisect. The node tags shall be entered in a clockwise or counter-clockwise order. | #The nodes must be located such that the main chords bisect. The node tags shall be entered in a clockwise or counter-clockwise order. | ||
#In the case that the beam-column element is rigidly framed to the joint, the tag for materials $Mat1 to $Mat4 shall be zero. | #In the case that the beam-column element is rigidly framed to the joint, the tag for materials $Mat1 to $Mat4 shall be zero. | ||
#The shear panel uniaxial material (with the tag $MatC) shall be calibrated for shear-equivalent moment versus shear distortion. In the calibration formulations the shear-equivalent moment is calculated by multiplying the joint average shear stress to the joint panel volume. | |||
# The element connects the external nodes to the central node via multi-point constraints, and Joint2D must be used along with either the Penalty or the Transformation constraint handler. | |||
---- | ---- | ||
Revision as of 18:20, 19 May 2011
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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 mid-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 or be used by any other node) |
| $Mat1 | uniaxial material tag for interface rotational spring at node 1. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) |
| $Mat2 | uniaxial material tag for interface rotational spring at node 2. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) |
| $Mat3 | uniaxial material tag for interface rotational spring at node 3. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) |
| $Mat4 | uniaxial material tag for interface rotational spring at node 4. Use a zero tag to indicate the case that a beam-column element is rigidly framed to the joint. (optional) |
| $MatC | uniaxial material tag for rotational spring of the central node that describes shear panel behavior |
| $LrgDspTag | an integer indicating the flag for considering large deformations: |
| 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:
- The nodes must be located such that the main chords bisect. The node tags shall be entered in a clockwise or counter-clockwise order.
- In the case that the beam-column element is rigidly framed to the joint, the tag for materials $Mat1 to $Mat4 shall be zero.
- The shear panel uniaxial material (with the tag $MatC) shall be calibrated for shear-equivalent moment versus shear distortion. In the calibration formulations the shear-equivalent moment is calculated by multiplying the joint average shear stress to the joint panel volume.
- The element connects the external nodes to the central node via multi-point constraints, and Joint2D must be used along with either the Penalty or the Transformation constraint handler.
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