Field testing of low-rise base isolated building

A series ofdynamic snap-back tests were carried out on a residence building in southern Italy at Rapolla (Potenza–Basilicata). The aim ofthe research was to investigate the seismic behaviour of low-rise base isolated structures mounted on rubber bearings only, or with a hybrid isolation system (sliding bearings for isolation and steel rubber bearings to have a re-centring force). High initial displacements (up to 170 mm) were reached using a reusable mechanical device, and a 200 t reaction wall. The paper presents the experimental study performed and its main results. As far as the protection level is concerned, the experimental response ofthe structure on the hybrid isolation system and on the steel rubber isolation system has been compared with the code seismic actions confirming the effectiveness ofboth tested isolation systems.