Experimental Dynamic Response of a Multi-Story Frame Structure Equipped with Non-Conventional TMD Implemented via Inter-Story Isolation

A shaking table experiment conducted on a multi-degrees-of-freedom frame structure equipped with non-conventional tuned mass damper (TMD) is presented. The TMD characterized by high ratio, without adding further structural masses, and realized via inter-story isolation. top story of four-story steel isolated converted into mass, connecting to the substructure two damping rubber bearings placed in series. Aspects related dynamic response as well seismic effectiveness assessment are addressed. Three configurations tested: reference structure, three-story intermediate TMD. input motion conditions considered are: white noise, sine sweep, natural earthquakes. Through experiments, identification carried out different behaviors emerge for tested. nonlinear effects provoked adopted isolators investigated, showing dissipative capabilities wide range amplitudes excitation. It demonstrated that smart control strategy useful enhancing vibration mitigation.