RINTC – DFF

From 2014 to 2022 a large national ReLUIS research project, named Implicit Seismic Risk of Structures, quantified the annual failure rate of Italian structures. The considered structures are from different typologies and materials: unreinforced masonry, fixed-based and base-isolated reinforced concrete, precast concrete, steel. They refer to different occupancies, residential and industrial, and include both buildings and bridges.

The analysed structures are representative of two categories: (i) those designed in accordance with the current Italian seismic code, and (ii) those designed according to previous Italian codes. Some structures in the latter category are also analysed before and after possible retrofitting interventions, also designed according the current and/or old Italian codes.

The structures were assumed to be located in different Italian sites chosen to be representative of different hazard levels: Milan, Rome, Naples, Catania, L’Aquila. Moreover, for each of the analysed structure, nonlinear dynamic analyses were performed by means of three-dimensional numerical models, and seismic fragility functions were developed with respect to two ad-hoc defined performance levels.

To get the goals of the research project, more than three-hundreds structures were investigated and over six-hundreds fragility functions were developed. Most of the results of the project are collected in a series of scientific international journal papers; nevertheless, a database collecting all the developed functions was compiled: ReLUIS-DPC RINTC Database of fragility functions.

Although the database intends to be self-explanatory and provides all the main properties of each structure and the parameters defining its fragility models, interested readers are addressed (via the links provided in the database) to the original papers in which the corresponding structural models and fragilities are discussed.