Rintc project: Influence of structure-related uncertainties on the risk of collapse of Italian code-conforming reinforced concrete buildings

This paper reports on the results of an ongoing Research Project aimed at computing the risk of collapse in new buildings conforming to the Italian Seismic Design Code. Companion papers describe the overall Research Project, funded by the Italian Civil Protection Department (DPC), its different application areas (reinforced concrete, masonry, steel buildings, etc), the overall seismic risk calculation procedure and the ground motion selection process followed to identify the recorded ground motions used for the multi-stripe analyses for ten different ground motion intensities. This papers describes the multivariate statistical model of the structure-related uncertainty developed with reference to reinforced concrete buildings, describing the variability of material properties as well as model error terms of the adopted response models for both RC members and masonry infills. The paper describes also the efficient sampling procedure adopted and discusses the results of the nonlinear analyses, both static and dynamic, carried out under different assumptions on the correlation structure for the selected reinforced concrete buildings (namely 6- and 9-storey moment resisting frame).