GNGTS 2019 - Atti del 38° Convegno Nazionale

GNGTS 2019 S essione 2.2 361 Porter K.A. (2003) An overview of PEER’s performance-based earthquake engineering methodology. In: Proc. 9th international conference on applications of statistics and probability in civil engineering. Sabetta, F. and Pugliese, A. (1996) Estimation of response spectra and simulation of nonstationarity earthquake ground motion, Bulletin of the Seismological Society of America 86 : 337 352. Schwarz D.P., Coppersmith K.J. (1984) Fault behavior and characteristic earthquakes: examples from the Wasatch and San Andreas fault zones. Journal of Geophysical Research 89 (B7), 5681–5697. Tondi, E., Cello, G. 2003. Spatiotemporal Evolution of the Central Apennines Fault System (Italy). Journal of Geodynamics , 36 , 113-128. EMPIRICAL FRAGILITY CURVES FOR ITALIAN RC BUILDINGS C. Del Gaudio 1 , A. Rosti 2 , M. Di Ludovico 1 , G. Magenes 2 , A. Penna 2 , M. Polese 1 , A. Prota 1 , P. Ricci 1 , M. Rota 3 , G.M. Verderame 1 1 University of Naples Federico II - Department of Structures for Engineering and Architecture, Naples, Italy 2 University of Pavia – Department of Civil Engineering and Architecture, Pavia, Italy 3 European Centre for Training and Research in Earthquake Engineering (EUCENTRE), Pavia, Italy This paper presents empirical fragility curves for Italian residential reinforced concrete buildings, based on post-earthquake damage data available in the online platform Da.D.O. (Dolce et al. , 2019a). These data, collected in the aftermath of earthquakes occurred in Italy in the period 1976-2012, provide information on building position, building characteristics and damage detected on different structural components. The intensity measure used in this study to characterize the ground motion at each inspected building is the PGA, evaluated from the shakemaps derived by the Italian National Institute of Geophysics and Volcanology (INGV) procedure (Michelini et al. , 2008). A critical review of the available data is carried out to guarantee the consistency among the considered databases: Friuli 1976 and Abruzzo 1984, Umbria-Marche 1997 and Emilia 2003, Pollino 1998 and Molise 2002 databases have been discarded, because they miss information about the damage on infills/partitions or because they are characterized by a negligible number of buildings or because there is not a shakemap developed by INGV. Then, a two-steps analysis is performed on the remaining databases to assess the degree of completeness of survey campaign. The first step aims at the identification of the Municipalities subjected to a partial survey campaign, i.e. where a number of inspections below 90% of the to- tal number of residential buildings from census data, has been carried out. These Municipalities are completely discarded to avoid biases in fragility analysis. Since all Municipalities of the Emilia 2012 database have been subjected to a partial survey campaign, only the Irpinia 1980 and L’Aquila 2009 databases are used in this study. The second step aims at the integration of non-surveyed buildings located in low-PGA areas, accounting for the negative evidence of damage. This integration is carried out by adding buildings, which amount is evaluated from National census data, that are sited in the non-surveyed and in the partially-surveyed (with completeness lower than 10%) Municipalities, assuming they were completely undamaged. Damage levels were defined according to EMS-98, considering a damage scale based on 5+1 levels (from no damage - DS0 – to structural collapse - DS5) as a function of damage de- tected on both vertical structures and infills/partitions. The damage conversion rules by Rota et al. (2008) and Dolce et al. (2019a) were adopted for vertical structures, whereas the Del Gaudio et al. (2017) rule was used for infills/partitions. The maximum observed level of damage was then associated to each building. Typological fragility curves, derived for 15 structural typologies, based on the number of stories (from 1 to 5) and type of design (i.e. for gravity loads only, for seismic loads pre-1981