Seismic Fragility of Italian Code-Conforming Buildings by Multi-Stripe Dynamic Analysis of Three-Dimensional Structural Models

The RINTC (2015–2017) project was a three-year research program aimed at assessing the seismic reliability of code-conforming structures in Italy. It dealt with five structural typologies of residential and industrial buildings: reinforced concrete, masonry, precast reinforced concrete, steel, and base isolated reinforced concrete. To reach its goals, several tens of structures featuring the same configuration were designed at different sites, characterized by different seismic hazard and considering two soil site conditions. The failure risk (i.e. the failure rate) of the buildings was evaluated by means of non-linear dynamic analysis of three-dimensional numerical models. The study herein presented parametrized the vulnerability models of the considered structures; in other words, it provides the seismic fragility curves for code-conforming Italian buildings analyzed in the RINTC project. Lognormal fragilities refer to global collapse failure and usability preventing damage, which are the performances considered in the project, and are derived via state-of-the-art methods, including consideration of the uncertainty in the estimation of their parameters. The curves are made available to be possibly used for further risk analyses and enable a discussion of the fragility fitting issues as a function on the site’s hazard.