GNGTS 2013 - Atti del 32° Convegno Nazionale

provided by numerous previous studies produced in L’Aquila downtown (MS–AQ Working Group, 2010; Amoroso et al. , 2010, 2014; Cardarelli e Cercato, 2010; Monaco et al. , 2012, 2013; Santucci de Magistris et al. , 2013; Milana et al. , 2011). A refined model for the Basilica subsoil will be supplied once all the investigations, supported by Eni, will be available. The 2D seismic response analyses were performed by considering the geotechnical cross section shown in Fig. 1, while the 1D numerical analyses were focused at the vertical in correspondence to Santa Maria di Collemaggio Basilica. The seismic microzonation studies (MS–AQ Working Group, 2010) and the deep boreholes (Amoroso et al. , 2010) allowed to estimate the thickness and the mechanical and dynamical soil properties of each geotechnical unit GU : filling materials “Ri”, alluvial deposits “Al”, debris slope deposits “Dt”, colluvial deposits “Cl”, red soils “LR”, calcareous breccias, divided into three sublayers, “Br1”, “Br2”, “Br3”, fluvial-lacustrine deposits, divided into five sublayers, “L1”, “L2”, “L3”, “L4”, “L5”, and calcareous bedrock “Bedrock”. Some refinements in the evaluation of the shear wave velocity V S were performed by considering the results of seismic dilatometer tests (Amoroso et al. , 2014; Monaco et al. , 2012, 2013; Santucci de Magistris et al. , 2013) and cross-hole test (Cardarelli e Cercato, 2010) and by assuming V S ~ 2000 m/s (Bordoni et al. , 2011). In addition, stiffness decay curves G/G 0 and damping ratio curves D , introduced into the numerical analyses, referred to: • the resonant column/torsional shear test results obtained by Amoroso et al. (2014) into the red soils of the southern part of L’Aquila city for “LR” and “Cl” units; • the gravel reference curve used by Tito Sanò into the numerical analyses developed for the seismic microzonation studies (MS–AQ Working Group, 2010) for “Al”, “Dt” and “Ri” units; • the dense gravel curve evaluated by Modoni and Gazzelloni (2010) for “Br1” and “Br2” units; Fig. 2 – Transfer functions obtained from 1D and 2D numerical modeling compared with SSR at AQ11 station. 174 GNGTS 2013 S essione 2.2