Seismic analysis of eccentric building structures by means of a refined one-storey model

A refined one-storey model has been developed which is able to evidence effects of interaction phenomena between axial and lateral forces in vertical resisting elements on torsional response of plan asymmetric building structures. Previous research has shown that influence of inelastic interaction is significant, leading to larger peak ductility demands and, mainly, to larger plan-disuniformity of demands in resisting elements. In this paper, the new model is used to re-evaluate, in the light of interaction phenomena, the performances of plan asymmetric system designed according to torsional provisions of the European code Eurocode8, in order to asses its suitability regarding torsional specification.