Displacement-Based Beam-Column
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.
element dispBeamColumn $eleTag $iNode $jNode $numIntgrPts
$secTag $transfTag <-mass $massDens> <-cMass>
<-integration $intType>
To change the sections along the element length, the following form of command may be used:
element dispBeamColumn $eleTag $iNode $jNode $numIntgrPts
-sections $secTag1 $secTag2 ... $transfTag <-mass $massDens>
<-cMass> <-integration $intType>
eleTag
|
unique element object tag |
|
end nodes |
numIntgrPts
|
number of integration points along the element. |
secTag
|
identifier for previously-defined section object |
$secTag1 \(secTag2 ...</strong></p></td> <td><p>\)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) |
|
to form consistent mass matrix (optional, default = lumped mass matrix) |
intType
|
numerical integration type, options are Lobotto, Legendre, Radau, NewtonCotes, Trapezoidal (optional, default = Legendre) |
NOTE:
- The default integration along the element is based on Gauss-Legendre quadrature rule.
- The default element is prismatic, i.e. the beam is represented by the section model identified by $secTag at each integration point.
- The valid queries to a displacement-based 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 valid entries being 1 through $numIntgrPts.
Examples
element dispBeamColumn 1 2 4 5 8 9; # displacement-based 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:
Code Developed by: Michael H. Scott, Oregon State University