MixedFrame: Frame with force-interpolation

Mixed finite element formulation for 3D frame elements.

Python (RT)

Model.element("MixedFrame", tag, nodes, section=None, transform=None, integration=None, *args)

Parameters:

• tag (int) – unique element tag

• nodes (tuple) – tuple of two integer node tags (see Node)

• section (int) – integer tag identifying a Section.

• transform (int) – identifier for previously-defined Transformations

• integration – identifier for previously-defined integration rule.

This formulation supports higher order strain measures and shear deformations.

The valid eleResponse queries to this element are 'force'.

References

[1]

Spacone, E., V. Ciampi, and F. C. Filippou (1996). “Mixed Formulation of Nonlinear Beam Finite Element.” Computers and Structures, 58(1):71-83.

[2]

Lee, C.‐L., and F. C. Filippou. “Frame Elements with Mixed Formulation for Singular Section Response.” International Journal for Numerical Methods in Engineering 78, no. 11 (June 11, 2009): 1320–44. https://doi.org/10.1002/nme.2531.

Code developed by: Claudio M. Perez (University of California, Berkeley).