VALUTAZIONE DEL FATTORE DI STRUTTURA DI EDIFICI PREFABBRICATI ESISTENTI COMPLETATI CON UN SISTEMA DI CONNESSIONE DISSIPATIVA NEI NODI

One of the most important seismic vulnerability of existing precast structures, widely used in Italy for one-storey industrial buildings, is due to the lack of mechanical connection between structural elements, as highlighted by the earthquakes that struck the Emilia region (northern Italy) in May 2012. The realization of dissipative connections is proposed as a solution for seismic rehabilitation of structures designed without anti-seismic standards, in particular for the beam-column joints. This work investigates the behavior of dissipative evices composed by carbon-wrapped steel tubes, able to guarantee a dissipative fuse effect. The aim of the study is to determine the effectiveness of the introduction of such devices in the beam-column connections. Incremental dynamic analyses have been performed on different case studies, in order to evaluate the behavior factor for structures with dissipative beam-column connections. The results of the numerical study show how the introduction of the dissipative devices produces, as expected, a significant reduction of forces transmitted to the structure, comparing the seismic response of simple structures equipped with dissipative devices with the response of the equivalent elastic systems.