View source for Displacement-Based Beam-Column Element

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This command is used to construct a displacement beam element object, which is based on the displacement formulation, and considers the spread of plasticity along the element.

{| 
| style="background:yellow; color:black; width:800px" | '''element dispBeamColumn $eleTag $iNode $jNode $numIntgrPts $secTag $transfTag <-mass $massDens>  <-integration $intType>'''
|}

To change the sections along the element length, the following form of command may be used:

{| 
| style="background:yellow; color:black; width:800px" | '''element dispBeamColumn $eleTag $iNode $jNode $numIntgrPts -sections $secTag1 $secTag2 ... $transfTag <-mass $massDens>  <-integration $intType>'''
|}

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{|
|  style="width:150px" | '''$eleTag''' || unique element object tag
|-
|'''$iNode $jNode''' || end nodes
|-
| '''$numIntgrPts''' || number of integration points along the element.
|-
| '''$secTag''' || identifier for previously-defined section object
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| '''$secTag1 $secTag2 ...''' || $numIntgrPts identifiers of previously-defined section object
|-
| '''$transfTag''' || identifier for previously-defined coordinate-transformation (CrdTransf) object
|-
| '''$massDens''' || element mass density (per unit length), from which a lumped-mass matrix is formed (optional, default=0.0)
|-
| '''$intType''' || numerical integration type, options are Lobotto, Legendre, Radau, NewtonCotes, Trapezoidal (optional, default= Lobotto)
|}


NOTE:

*The default integration along the element is based on Gauss-Lobatto quadrature rule (two integration points at the element ends).

*The default element is prismatic, i.e. the beam is represented by the section model identified by $secTag at each integration point.

*The -iter switch enables the iterative form of the flexibility formulation. Note that the iterative form can improve the rate of global convergence at the expense of more local element computation.

*The valid queries to a nonlinear beam-column element when creating an ElementRecorder object are 'force,' and 'section $secNum secArg1 secArg2...' Where $secNum refers to the integration point whose data is to be output.


EXAMPLE:

element dispBeamColumn 1 2 4 5 8 9; # force beam column element added with tag 1 between nodes 2 and 4 that has 5 integration points, each using section 8, and the element uses geometric transformation 9


REFERENCES:


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Code Developed by: <span style="color:blue"> Micheal Scott, Oregon State Unievrsity </span>