ABSTRACT
A numerical treatment of the dynamic inequality problem concerning the elastoplastic- fracturing unilateral contact with friction between neighboring steel structures during earthquakes is presented. Second-order geometric effects are taken into account and the generally nonconvex constitutive contact laws are piece-wise linearized The numerical procedure is based on an incremental problem formulation and on a double discretization, in space by FEM and in time. So, in each time-step a nonconvex linear complementarity problem is solved with a reduced number of unknowns.
