3.1.10.7. Force-Based Beam Column Element

This command is used to construct a forceBeamColumn element object, which is based on the iterative force-based formulation. A variety of numerical integration options are available for the element state determination and encompass both distributed plasticity and plastic hinge integration, see Beam Integration Command options. The element if formulated in a basic system, given by its end rotations and axial deformation. The geometric transformation between this basic system and the 2d or 3d system comprisomg nodal displacements and rotations, is provided by the geometric transformation, see Geometric Transformation Command options.

Note

Force based elements use known equilibrium along the element length to determine section forces. As a consequence, in a finite element setting the element must iterate given nodal displacements at each trial step to determine the section deformations at the integration points to cause such. For a discussion of differences between this force based beam column element and the displacement based element see this post on portwooddigital

TclOpenSeesPy

element forceBeamCoumn $eleTag $iNode $jNode $transfTag $integrationTag <-iter $maxIter $tol>  <-mass $mass>

Argument	Type	Description
$eleTag	integer	Unique element object tag
$iNode	integer	tag of the iNode
$jNode	integer	tag of the jNode
$transfTag	integer	tag of the geometric transformation object
$integrationTag	integer	tag of the beam integration object
$maxIter	integer	max number of iterations, default = 10
$tol	float	tolerance, default = 1.0e-12
$mass	float	Element mass per unit length, default = 0.0

Note

The valid queries to an elastic beam-column element when creating an ElementRecorder object are:

1. force or globalForce

2. localForce

3. basicForce

4. section $sectionNumber $arg1 $arg2 … (note: $sectionNumer is integer 1 through $numIntegrPts)

5. basicDeformation

6. plasticDeformation

7. inflectionPoint

8. tangentDrift

9. integrationPoints

10. integrationWeights

3.1.10.7.1. References

[1]

Neuenhofer, Ansgar, FC Filippou. Geometrically Nonlinear Flexibility-Based Frame Finite Element. ASCE Journal of Structural Engineering, Vol. 124, No. 6, June, 1998. ISSN 0733-9445/98/0006-0704-0711. Paper 16537. pp. 704-711.

[2]

Neuenhofer, Ansgar, FC Filippou. Evaluation of Nonlinear Frame Finite-Element Models. ASCE Journal of Structural Engineering, Vol. 123, No. 7, July, 1997. ISSN 0733-9445/97/0007-0958-0966. Paper No. 14157. pp. 958-966.

[3]

Neuenhofer, Ansgar, FC Filippou. ERRATA – Geometrically Nonlinear Flexibility-Based Frame Finite Element. ASCE Journal of Structural Engineering, Vol. 124, No. 6, June, 1998. ISSN 0733-9445/98/0006-0704-0711. Paper 16537. pp. 704-711.

[4]

Taucer, Fabio F, E Spacone, FC Filippou. A Fiber Beam-Column Element for Seismic Response Analysis of Reinforced Concrete Structures. Report No. UCB/EERC-91/17. Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley. December 1991.

[5]

Spacone, Enrico, V Ciampi, FC Filippou. A Beam Element for Seismic Damage Analysis. Report No. UCB/EERC-92/07. Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley. August 1992.