The aim of the proposed paper is the discussion of a strategy of seismic retrofitting which exploits the technique of the Tuned Mass Damper (TMD). The Tuned Mass Damper is an additional mass, usually located at the top of a building with the scope of reducing the seismic response. This technique is usually applied to tall buildings under dynamic actions manly due to wind. In the context of the built heritage, the idea is to realize an additional mass on the top of an existing building as a new storey or a portion of it, located on seismic isolators characterized by a fixed damping. This idea has already been applied successfully in Italy on some existing buildings.
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