GNGTS 2014 - Atti del 33° Convegno Nazionale

314 GNGTS 2014 S essione 2.3 structural response of masonry buildings In the historic centeR of genoa, italy S. Barani 1,2 , R. De Ferrari 1,2 , S. Cattari 3 , C. Eva 2 , S. Lagomarsino 3 and A. Pieracci 4 1 Dipartimento di Scienze della Terra dell’Ambiente e della Vita, Università di Genova, Italy 2 GEAmb S.r.l., spin-off dell’Università di Genova, Italy 3 Dipartimento di Ingegneria Civile, Chimica e Ambientale, Università of Genova, Italy 4 Autorità Portuale di Genova, Italy Foreword and scope of work. In recent years, the horizontal-to-vertical spectral ratio (HVSR) technique applied to noise recordings [also known as Nakamura’s technique (Nakamura, 1989)] has been widely applied in the engineering seismology as it represents an economical and efficient alternative to traditional strong ground motion analyses based on standard spectral ratios (SSR) from earthquake recordings (Borcherdt, 1970) and numerical simulations. Although its primary application is related to the analysis of the resonance frequency of soils (e.g., Lermo and Chavez-Garcia, 1993, 1994; Lachet and Bard, 1994; Mucciarelli, 1998; Bard, 1999; Bindi et al. , 2000; Mucciarelli and Gallipoli, 2001; Parolai et al. , 2001, 2004, 2010; Gallipoli et al. , 2004a; Gosar, 2007; De Ferrari et al. , 2010), this technique is nowadays widely applied to characterize Fig. 1 – a) Simplified geological map and maximum p.c.p.v. (peak component particle velocity) values recorded on the top floor of each building along the horizontal component; the white triangle (NK01) indicates a “free field” noise measurement; b) view of building B3 (with the yellow façade); c) tie rods track of a modern intervention; d) crack.