Sharif Digital Repository

In the special zones of frame elements, which are used for seismic energy dissipation, inelastic interaction among the internal forces needs to be considered more precisely. This paper describes a special element called a VM link element for modeling the shear-flexural interaction in the inelastic zones of beam elements. The element may be used in the any inelastic location of frames subjected to the monotonic or cyclic loadings. The inelastic shear and flexural deformations are considered by using the multi-surfaces plasticity concept with dissimilar yield surfaces. A new kinematic hardening and new non-associated flow rules are introduced for definition of the plastic deformations and... 

The present paper introduces a mixed shear-flexural (VM) link element that is capable of modelling shear yielding, flexural yielding, and their interaction under monotonic and cyclic loadings. The inelastic deformations are modelled using the multisurfaces approach with dissimilar yield surfaces and a stiffness matrix with nonzero off-diagonal components in shear-flexural space. A new kinematic hardening and new non-associated flow rules are employed. A special girder, which has an open web in the middle, is introduced and modelled using the developed VM link element. It is shown that the results of analyses using the VM link element are in good agreement with those from a finite element... 

In the present paper, a mixed, shear-flexural (VM) hinge element, with zero or nonzero length, for using in frames, has been introduced, where shear-flexural interaction has been considered. The element has the capability of modeling flexural yielding, shear yielding and their interaction in frames, subjected to all kinds of monotonic or cyclic loadings. The inelastic shear and flexural deformations and tangential stiffnesses are considered by using the multi-surfaces approach with dissimilar yield surfaces and by a stiffness matrix with nonzero off-diagonal components. A new kinematics hardening rule and, also, a new non-associated flow rule are introduced. The mixed hinge element can be...