FEDEASLab

General > Aj_matrix

Aj_matrix

Purpose

kinematic matrix of structural model with 2d/3d truss and 2d frame elements

Synopsis

Aj = Aj_matrix (Model)

Description

AJ_MATRIX kinematic matrix of structural model with 2d/3d truss and 2d frame elements
  AJ = AJ_MATRIX (MODEL)
  the function forms the kinematic matrix AJ for all degrees of freedom (DOFs) and
  all element deformations of the structural model specified in data structure MODEL; 
  the kinematic matrix AJ includes the effect of joint offsets for the elements;
  the function is currently limited to 2d/3d truss and 2d frame elements

Cross-Reference Information

This function calls:

  • Localize returns the node coordinates and id array of element
  • ElmLenOr element length and x-axis orientation (direction cosines)
  • TranJnt sets up transformation matrix for finite size joints
This function is called by:
  • Event2Event_NLAnalysis event-to-event incremental analysis with linear or P-DELTA geometry
  • PlasticAnalysis collapse load factor, basic forces, and collapse mechanism by plastic analysis
  • Get_Veps determine the elastic deformations from the displacements and plastic deformations