ABSTRACT
Bridges are fundamental for the transportation system of a nation and they can be subject to significant deterioration phenomena linked to the fact that the construction period typically dates back to the 1960s. This study involves the analysis of four case study bridges belonging to the Italian highway network. Analytical fragility curves have been constructed for each of the bridges. The case studies have also been analysed to determine the Structural and Foundational and Seismic Classes of Attention, following the approach proposed by the 2020 Italian Guidelines. It was possible to compare two different assessment approaches. In regions with higher seismicity the main problems in bridges are related to bearings and connecting elements located in the piers. These problems may be linked to the fact that at the time of the design of the structures there was less understanding of need for seismically resilient bridge design.
