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This command is used to construct a nonlinearBeamColumn element object, which is based on the non-iterative (or iterative) force formulation, and considers the spread of plasticity along the element.
element nonlinearBeamColumn $eleTag $iNode $jNode $numIntgrPts $secTag $transfTag <-mass $massDens> <-iter $maxIters $tol>
$eleTag |
unique element object tag |
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$iNode |
$jNode |
end nodes |
$numIntgrPts |
number of integration points along the element. |
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$secTag |
identifier for previously-defined section object |
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$transfTag |
identifier for previously-defined coordinate-transformation (CrdTransf) object |
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$massDens |
element mass density (per unit length), from which a lumped-mass matrix is formed (optional, default=0.0) |
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$maxIters |
maximum number of iterations to undertake to satisfy element compatibility (optional, default=1) |
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$tol |
tolerance for satisfaction of element compatibility (optional, default=10-16) |
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The integration along the element is based on Gauss-Lobatto quadrature rule (two integration points at the element ends).
The 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,' 'stiffness,' and 'section $secNum secArg1 secArg2...' Where $secNum refers to the integration point whose data is to be output.
Useful references for this element are found in the References (References, http://www.) chapter.
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