2012 Emilia earthquake, Italy: reinforced concrete buildings response

Abstract

Data of the Italian National Institute of Statistics are collected aimed at characterizing

Analytical versus observational fragilities: the case of Pettino (L’Aquila) damage data database

“…This capacity curve can be defined in the acceleration displacement response spectrum (ADRS) format (S a -S d ) through the definition of four parameters (see also De Luca et al 2013a;Manfredi et al 2013):…”

“…elastic spectral acceleration S a or PGA, and it evaluates record to record variability providing directly not only median approximate IDA curves but also their 16° and 84° percentiles. Other FAST applications available in literature (De Luca et al 2013a;De Luca et al, 2013b;Manfredi et al 2013) employed the R--T relationship calibrated on infilled RC buildings by Dolšek and Fajfar (2004). Both R--Ts provides similar results, and FAST results are not strictly affected by this choice.…”

“…In particular, for external infills the average value of window opening coefficient is assumed (equal to 0.85), while for internal infills the average value of door opening coefficient is assumed (equal to 0.7). Design is made according to L'Aquila seismic classification up to 2003 (second category), given age of construction data in Figure4b, see Ricci et al (2011a), and Manfredi et al (2013) for details. R  and R  are considered equal to 1.1, and 1.45, respectively, see De Luca et al (2013a).…”

“…The observational fragilities obtained are then employed for the calibration of FAST method, a large scale vulnerability approach for infilled RC moment resisting frames (MRF). This methodology has been applied to different earthquake cases (De Luca et al 2013a;Manfredi et al 2013), such as Lorca (2011), Spain, and Emilia (2012), Italy. The approach belongs to the wider family of vulnerability assessment methodologies based on spectral displacements (e.g., Kircher et al 1997;Erdik et al 2004, among others) in which damage states are classified according to the 1998 European Macroseismic Scale (Grünthal et al 1998).…”

“…Even if comparisons of FAST with damage data have been made also for Lorca and Emilia earthquakes (see De Luca et al 2013a;Manfredi et al 2013), this is the first case in which damage data are enough accurate to carry out observational fragility curves to be compared to FAST analytical fragilities. Thus, it was possible to calibrate input variables of FAST method and select the optimal choice to get a satisfactory agreement between observational and analytical data.…”