Issue 51

F. Clementi et alii, Frattura ed Integrità Strutturale, 51 (2020) 313-335; DOI: 10.3221/IGF-ESIS.51.24 333 Figure 21 : Evolution of the dissipated energy of the civic clock tower of Amatrice (Rieti, Italy) under the four main shocks in the three components x,y,z recorded in the village during the Central Italy seismic sequence of 2016 for both configurations, with (namely C) and without (NC) the steel chains, at varying of the friction on the bell cell. C ONCLUSIONS he numerical assessment of the iconic crumbling of the clock tower of Amatrice (Rieti, Italy) stroked by Central Italy seismic sequence of 2016, is here briefly reported and summarized, underlining failure mechanisms of this peculiar structure, especially at the upper level, and the incidence of the different possible variables, first of all the quality of the masonry. To gain a complete comprehension of the mechanical response of such complex ancient structures to seismic loading, focusing on the portions that were damaged the most during the seismic actions, a discontinuous approach with the NSCD method was used, implemented in the LMGC90 © , combining modelling simplicity and great predictive capabilities. T