Benchmarking the seismic assessment of unreinforced masonry buildings from a blind prediction test

This paper presents a benchmark exercise for the seismic assessment of unreinforced masonry (URM) buildings as follow-up blind prediction test organized in context European Conference Earthquake Engineering Series. The was aimed at better defining open issues current procedures modeling and performing analysis URM buildings, by highlighting uncertainty that can influence results. work an overview approaches used different research teams scope predictions. structure three-story building with traditional architecture from which two Cases were considered: A) stone walls flexible horizontal diaphragms B) brick rigid diaphragms. A wide range participating concerning strategies, methods criteria attainment limit states, are here addressed potential sources dispersion results compared terms capacity curves, predicted failure mechanisms compatible fulfillment states near collapse damage limitation, related minimum values peak ground acceleration (PGA). show overall good agreement patterns both structures, presenting some differences type mode its extent. However, scatter curves critical PGAs is very high, especially Case diaphragms, indicating clearer codes required professionals.