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Geometry > kg_2dFrm

kg_2dFrm

Purpose

geometric stiffness matrix for 2-node 2d frame element for different options

Synopsis

kg = kg_2dFrm (option,xyz,u,q)

Description

KG_2dFRM geometric stiffness matrix for 2-node 2d frame element for different options
  KG = KG_2dFRM (OPTION,XYZ,U,Q)
  the function determines the geometric stiffness matrix KG of a 2-node 2d frame element
  with end coordinates in array XYZ (node i corresponds to first column and node j to second);
  the geometric stiffness matrix depends on the node displacement values in array U (ndfx2)
  in the global reference system and on the basic force vector Q;
  OPTION is a character variable with one of three values:
  'linear','PDelta' and 'corotational' for linear, P-Delta and corotational geometry, resp.

Cross-Reference Information

This function calls:

  • ElmLenOr element length and x-axis orientation (direction cosines)
This function is called by:
  • Inel2dFrm inelastic 2d frame element with different basic element types
  • Dinel2dFrm_EBwDF 2d-frame element with distributed inelasticity (displacement formulation)
  • Dinel2dFrm_EBwFF 2d-frame element with distributed inelasticity (force formulation)
  • LE2dFrm 2d LE frame element under linear or nonlinear geometry
  • LE2dFrm_w2ndOrdDF 2d LE frame element with moderate deformations under linear or NL geometry
  • LE2dFrm_w2ndOrdFF 2d LE frame element with moderate deformations under linear or NL geometry
  • LE2dFrm_wPdelta 2d linear elastic frame element with P-delta effect under linear or nonlinear geometry
  • LE2dFrm_wVarIDF 2d LE frame element with variable cross section under linear or NL geometry
  • LE2dFrm_wVarIFF 2d LE frame element with variable cross section under linear or NL geometry