NUMERICAL SIMULATION OF THE NONLINEAR EARTHQUAKE RESPONSE OF A MONITORED URM SCHOOL BUILDING Francesco Graziotti 1 , Paolo Toninelli 1 , Marco Solenghi 1 , Gabriele Guerrini 1 , Andrea Penna 1 1 Department of Civil Engineering and Architecture - DICAr, University of Pavia, via Ferrata 3, 27100 Pavia, Italy e-mail: francesco.graziotti@unipv.it paolo.toninelli01@universitadipavia.it marco.solenghi01@universitadipavia.it gabriele.guerrini@unipv.it andrea.penna@unipv.it Abstract The seismic sequence that stroke central Italy in August and October 2016 affected a large number of school buildings. One of these was the elementary school of the town of Visso, a 5000-cubic-metre, two-storey stone masonry building. The Italian Structural Seismic Observa- tory (OSS), a network of permanent sensors mainly installed in public buildings by the Depart- ment of Civil Protection, monitored this school. Twenty-three accelerometric channels allowed recording the dynamic response of the building during the entire sequence, which caused the collapse of portions of masonry walls and floor diaphragms. Double-integration of accelera- tion time histories provided estimations of displacements and deformations, which can be re- lated to different damage states. A detailed geometric and mechanical characterization of the structural system complemented the data provided by the OSS, allowing the development of a reliable equivalent-frame numerical model of the building, implemented in the software Trem- uri. The comparison between data recorded on site and nonlinear time-history analysis results confirmed some of the main modelling assumptions typically validated against smaller shake- table experiments. Keywords: Italian Structural Seismic Observatory, URM, Nonlinear Behaviour, Numerical Modelling, Dynamic Analysis 1827 COMPDYN 2019 7 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Crete, Greece, 24–26 June 2019 Available online at www.eccomasproceedia.org Eccomas Proceedia COMPDYN (2019) 1827-1838 ISSN:2623-3347 © 2019 The Authors. Published by Eccomas Proceedia. Peer-review under responsibility of the organizing committee of COMPDYN 2019. doi: 10.7712/120119.7039.19171