GNGTS 2014 - Atti del 33° Convegno Nazionale

distinction was made between the two. The taller buildings were reinforced concrete structures, while shorter buildings, which were generally residential structures and apartment blocks, tended to be unreinforced masonry structures. Some tall buildings, such as the Portomaso Tower (Fig. 2a) consisting of 23 floors and the Fortina Hotel consisting of 17 floors (Fig. 2b) were investigated in more detail, by measuring ambient noise at several floors in between. This is interesting because it provides potential information on higher modes of vibration. For the shorter buildings (Fig 2c), ambient noise Fig. 2 – Hi/Ho results for four different investigated buildings (see text for details). 390 GNGTS 2014 S essione 2.3