Jelena Milosevic¹, Rita Bento¹,and Serena Cattari²
1)  CERIS, ICIST, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
address: Av. Rovisco Pais 1049-001 Lisboa, Portugal
e-mail: {jelena.milosevic,rita.bento}@tecnico.ulisboa.pt
2)  Dept. of Civil, Environmental and Chemical Engineering (DICCA), University of Genoa, Genoa,
Italy
address: Via Balbi 5, 16126 Genoa, Italy
e-mail: serena.cattari@unige.it

Keywords: Mixed masonry-reinforced concrete buildings, Sensitivity analysis, Seismic assessment,
Nonlinear static analysis, Fragility curves.

Abstract. Seismic vulnerability assessment of the old buildings assumes great importance, not only because of the obvious physical consequences in the eventual occurrence of a seismic event, but also because it is the aspect in which engineering research can intervene. Unfortunately, due to the lack of knowledge and uncertainties, which appear in case of old existing building in general, or in mixed masonry-reinforced concrete buildings in particular, the assessment of the seismic vulnerability is undoubtedly a challenging task. The object of this paper is to assess the seismic behaviour of mixed masonry-reinforced concrete building class through the nonlinear static sensitivity analyses by considering the uncertainty that reflects the inherent variability of the outcome of a repeatable experiment (aleatory uncertainty) and the seismic demand as provided by EC8. To the latter goal, results from these analyses are used to define the Intensity Measure (IMLS) and dispersion (βLS) to the final aim to obtain the fragility curves by quantitatively assessing the effect due to the variability of seismic demand and structural capacity.