Mixed Dimensional Finite Element Analysis of Frame Models

摘要

A technique of idealising frame models using substructures is outlined. All joints are modelled in 3D but, using substructures, each 3D joint is converted to an equivalent stiffness element. The slender regions between the joints are modelled using beam elements. Coupling between the 3D substructures and the beam elements is carried out in a manner than conforms with the theory of elasticity. Post-elastic stressing is evaluated using yield loci of the joint substructures. The elastic response of complete frames can therefore be predicted in an accurate and efficient manner.