Inelastic seismic demand from records and from numerical simulations of ground motion during the Po plain earthquake of May 29 2012

Simulated ground motions in Seismic Engineering and Seismic Design could be a very useful tool, following that purpose this thesis presents a numerical analysis of near-source ground motion during the MW 6.0 2012 May 29 earthquake in the Po Plain, Northern Italy. This work provides a comparison between 3D physics-based numerical simulations (PBSs) and recorded ground motion. Numerical simulations were performed using the open-source highperformance code SPEED, based on the Discontinuous Galerkin Spectral Elements method and Broad-Band (BB) ground motions were generated through a hybrid method, combining 3D low frequency waveforms with high-frequency stochastic synthetics. In order to prove the reliability of the simulations produced based on an Arti cial Neural Network (ANN) approach the synthetic ground motions are compared with a dataset of near-source recordings of the event. Speci cally this thesis would like to analyse the suitability of these numerical simulation in seismic design, by considering the response of structures with different ductility. The validation is made by performing an investigation in the elasto-plastic range, different yield strength Reduction Factor are considered and the analysis is focused on the Spectral Displacement of each SDoF system. As a further investigation the results are compared against GMPE (De Luca et al. 2011, and Akkar et al. 2019) to show the main differences between an empirical approach and physics-based source-to-site numerical simulations one.

Le ground-motions ottenute tramite simulazione si possono rivelare uno strumento molto importante nell'ingegneria sismica e nella progettazione di strutture che ad essa fanno riferimento. Questa tesi si pone l'obbiettivo di analizzare l'evento sismico conosciuto come MW 6.0 2012 May 29 Po Plain, Northern Italy confrontando i risultati provenienti da ground-motions (GMs) simulate numericamente, 3D physics-based numerical simulations (PBSs) e GMs pervenuteci da registrazioni. In particolare le simulazioni in esame sono state ottenute mediante un codice chiamato SPEED, questa tesi vuole analizzare la capacità di riprodurre in maniera efficacie la risposta all'oscillazione elastoplastica. A tal proposito sono state considerate le risposte di strutture con diversa duttilità, confrontando le risposte dell'oscillatore per diversi fattori di riduzione della forza. E' stato poi affrontato il tema del confronto con le Ground Motion Prediction Equation sulle quali sono stati riportati i risultati sia di simulazioni che di registrazioni.