3.1.10.21. Flexure-Shear Interaction Displacement-Based Beam Column Element

This command constructs a distributed-plasticity, displacement-based beam-column element that couples flexural and shear deformations. The command name in OpenSees is dispBeamColumnInt. The formulation follows Massone et al. (2006) and is limited to 2D analysis (ndm=2, ndf=3).

element dispBeamColumnInt $eleTag $iNode $jNode $numIntgrPts $secTag $transfTag $cRot <-mass $massDens>

element dispBeamColumnInt $eleTag $iNode $jNode $numIntgrPts -sections {$secTag1 ...} $transfTag $cRot <-mass $massDens>

Argument	Type	Description
$eleTag	integer	unique element tag
$iNode $jNode	integer	end node tags
$numIntgrPts	integer	number of integration points along the element
$secTag	integer	tag of a FiberSection2dInt section (same section at all points)
$secTag1 …	list integer	list of section tags when using -sections
$transfTag	integer	tag of a LinearInt geometric transformation
$cRot	float	center of rotation as a fraction of element height from bottom (0 to 1)
$massDens	float	element mass per unit length (optional; default 0.0)

Note

1. This element requires the LinearInt geometric transformation and a FiberSection2dInt section created for strip (panel) modeling with flexure-shear interaction.

2. Parameter $cRot distributes transverse displacement between flexural (curvature) and shear (shear strain) components.

3. Valid Element Recorder queries include force, stiffness, and section $secNum ....

Example

1. Tcl Code

geomTransf LinearInt 1
element dispBeamColumnInt 1 1 3 2 2 1 0.4

2. Python Code

geomTransf('LinearInt', 1)
element('dispBeamColumnInt', 1, 1, 3, 2, 2, 1, 0.4)

Code developed by: Leo Massone, Kutay Orakcal, John Wallace