GNGTS 2018 - 37° Convegno Nazionale

386 GNGTS 2018 S essione 2.2 Occhi, M., Occhi, A., Gualerzi, D.; 2008: Local seismic protection method for existing and/or possible construction sites destined for the foundation areas and those surrounding the building construction. Patent EP1956147 Occhi, M., Occhi, A., Gualerzi, D.; 2006: A method for homogenizing and stabilising a soil by way of injections Patent EP1914350. Regione Emilia Romagna; 2012: Determinazione n° 12418 del 02/10/2012 Approvazione degli elaborati cartografici concernenti la delimitazione delle aree nelle quali si sono manifestati gravi effetti di liquefazione a seguito degli eventi sismici del 20 e 29 maggio 2012 e degli indirizzi per interventi di consolidamento dei terreni. Robertson P.K., and Wride C.E.; 1998: Evaluating cyclic liquefaction potential using the cone penetration test. Can. Geotech. J., Ottawa, 35(3), 442–459 EMPIRICAL FRAGILITY CURVES FOR ITALIAN RESIDENTIAL BUILDINGS C. Del Gaudio 1 , M. Di Ludovico 1 , G. Magenes 2 , A. Penna 2 , M. Polese 1 , A. Prota 1 , P. Ricci 1 , A. Rosti 2 , M. Rota 3 , G.M. Verderame 1 1 Dipartimento di Strutture per l’Ingegneria e l’Architettura - Università degli Studi di Napoli Federico II, Italy 2 Dipartimento di Ingegneria Civile e Architettura - Università di Pavia, Italy 3 Dipartimento Costruzioni e Infrastrutture, Fondazione EUCENTRE, Italy Introduction. This study describes the derivation of empirical fragility curves for the Italian residential building stock based on the data recently published by the Italian Department of Civil Protection in the online platform Da.D.O. (Database di Danno Osservato, Dolce et al. 2017), collecting single-building post-earthquake damage data from Italian earthquakes. An application of the proposed fragility models to the Campania region is also presented. Damage database. The Da.D.O. platform collects post-earthquake damage databases of nine seismic events occurred in Italy, from Friuli 1976 to Emilia 2012. On the whole, data on slightly more than 300.000 are available, with approximately 80% of masonry buildings, 8% of RC buildings and the remaining part made of other typologies. Among all of the abovementioned events, available data differ for type and detail of information on damage (e.g., assumed damage scale, presence or not of information on damage extent and/or on damage to nonstructural components). The fragility analysis based on these data, as described below, employs an instrumental intensity measure (Peak Ground Acceleration, PGA) for the characterization of the seismic input. Therefore, only the events for which a shake map consistently derived with the INGV procedure (Michelini et al. , 2008) was available were considered. For RC buildings, only seismic events with damage data on structural and nonstructural (infill/partitions) components were selected. Furthermore, among these selected events, only those with damage data characterized by “complete” surveys were retained, in order to avoid possible biases in the estimation of seismic fragility due to the presence of non-surveyed (likely non-damaged) buildings. Based on these criteria, the Irpinia (1980) and L’Aquila (2009) databases were employed only. Description of complete damage datasets. About 77% of residential masonry buildings of the complete damage database, including data from these two seismic events, are made of irregular layout or poor-quality materials, whereas 23% are characterized by regular texture and good-quality masonry. Focusing on the Irpinia dataset, 89% and 11% of masonry buildings are low-rise (i.e. 1-2 stories) and mid-/high-rise (i.e. >2 stories), respectively. About 59% of residential masonry buildings of the L’Aquila dataset are low-rise, whereas 41% have more than 2 stories. More than 36% of the Irpinia masonry constructions date back prior to 1900, whereas about 50% of the L’Aquila masonry buildings were built before 1920.