FEDEASLab

Geometry > kg_Truss

kg_Truss

Purpose

geometric stiffness matrix for 2d/3d 2-node truss element for different options

Synopsis

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

Description

KG_TRUSS geometric stiffness matrix for 2d/3d 2-node truss element for different options
  KG = KG_TRUSS (OPTION,XYZ,U,Q)
  the function determines the geometric stiffness matrix KG of a 2-node 2d/3d truss 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 (ndmx2)
  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:
  • InelTruss 2d/3d inelastic truss element under linear or nonlinear geometry
  • LETruss 2d/3d linear truss element under linear or nonlinear geometry