GNGTS 2018 - 37° Convegno Nazionale

328 GNGTS 2018 S essione 2.1 Information on existing coastal residential buildings has been retrieved from census databases of the “ National Institute of Statistics ” ( ISTAT ) and specific surveys, considering the inundation areas identified according to New-Zeland guidelines “ DGL 08-16 ”. Coastal buildings are classified in different building classes based on census database and seismic zone. For masonry buildings, local collapse mechanisms are analysed for a generic building model considering shear and flexural failure for in-plane mechanisms, along with horizontal and vertical bending failures for out-of-plane mechanisms. In the case of RC structures, the global behaviour under tsunami loading is investigated, by means of a fibre model analysis on plan RC frames. Several analyses have been performed on building models that are representative of Italian coastal buildings with Mathworks Matlab , and mechanical fragility curves are derived from structural analysis results using least squares regression and a lognormal probability density function. Masonry buildings show a greater vulnerability than RC buildings according to empirical fragility curves available in literature. The final goal is the definition of damage and loss scenarios due to specific tsunami waves, which can be treated as having either a constant height on the coastline, or a variable height obtained from scenario analyses provided by SPOT project partners; scenario analyses take into account earthquakes or landslides as tsunami sources. Future work will take into account the performance reduction for coastal buildings due to earthquake damages. In this case, the tsunami damages are expected to be greater, the more the earthquake epicentre is close to the coast. Acknowledgments. The contents of this paper represent the Authors’ ideas and do not necessarily correspond to the official opinion and policies of the Italian Ministry of Economic Development and the National Civil Protection Department of Italy. References ASCE 7-16 ; 2017: Minimum design loads for buildings and other structures , 16th American Society of Civil Engineering ASCE, Reston, USA, pp.25–50. Belliazzi S., Lignola G.P., Di Ludovico M., Prota A., Di Bucci D., Dolce M., Antoncecchi I., Terlizzese F.; 2017:“ Tsunami on existing building stock: preliminary large-scale approach ”. In proceedings GNGTS. 36° Convegno del Gruppo Nazionale di Geofisica della Terra Solida. Trieste, Italia 14-16 Novembre 2017, pp.448-451 Belliazzi S., Lignola G.P., ProtaA., 2018: “Textile Reinforced Mortars systems: a sustainable way to retrofit structural masonry walls under tsunami loads” . International journal of Masonry Research and Innovation, 3(3); pp. 200- 222. Circolare Ministero dei Lavori Pubblici n. 21745 del 30/07/1981: Istruzioni relative alla normativa tecnica per la riparazione ed il rafforzamento degli edifici in muratura danneggiati dal sisma . (in Italian) Fig. 3 - Grid example for the municipality of Gela.