Field testing of low-rise base isolated building

Abstract

A series of dynamic snap-back tests were carried out on a residence building in southern Italy at Rapolla (Potenza–Basilicata). The aim of the 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 of the structure on the hybrid isolation system and on the steel rubber isolation system has been compared with the code seismic actions confirming the effectiveness of both tested isolation systems.