The current Italian code provisions, i.e. the Norme Tecniche per le Costruzioni 2008 (NTC08), allow engineers to design seismic resistant structures with a certain amount of safety with respect to the onset of given limit states (e.g., Collapse – SLC - or Life Safety - SLV). Those safety margins with respect to collapse and, therefore, to potential loss of life are implicitly assumed to be adequate if compared to those of other risks. However, these safety margins are not directly computed but they are rather implicitly included in the code requirements that prescribes the engineers to design structures to withstand rare, severe levels of ground shaking associated with long return periods, TR, at building site. Although the compliance of these requirements guarantees a certain level of safety, the designer does not know the probability that the structure under design will reach (or exceed) a given limit state during its life span. Moreover, there is no assurance in the code provisions that different structures designed for the same site or of similar structures at different sites have the same margin of safety with respect of a given limit state. As of today, in Italy no studies have systematically addressed the issue of estimating such probabilities for several classes of buildings designed according to the current code provisions. The knowledge of these probabilities would form a sound basis for further considerations regarding acceptability of the margin of safety of current structures. The present project intends to start filling the existing gap by developing a systematic methodology for the estimation of collapse probabilities of buildings designed according to the current code and by applying it to different classes of buildings.
Inizio progetto: A.A. 2014 - 2015
Fine progetto: A.A. 2017 - 2018