Abstract
The method with the separation of rigid body displacements is most commonly used in the finite displacement analysis of structures. This method introduces local moving coordinates in order to remove the rigid body rotations of respective finite elements. The local coordinates utilized in the analysis of plane frames are classified into two kinds and the choice of the local coordinates is known to have an effect on the accuracy and the convergence of the solutions.
This paper precicely examines the theoretical effect of local coordinates on the accuracy of the finite displacement analysis for plane frames.
