Multi-risk assessment for bridges
The application of the Italian Guidelines
Silvia Di Sano (Polytechnic of Milan)
Giancarlo Costa (Polytechnic of Milan, BAM Federal Institute for Materials Research and Testing)
Pier Francesco Giordano (Polytechnic of Milan)
Maria Pregnolato (University of Bristol, TU Delft - Hydraulic Structures and Flood Risk)
Maria Pina Limongelli (Polytechnic of Milan, Lund University)
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Abstract
Bridges are essential elements in the built environment since they underpin the functioning of transportation systems. Nevertheless, they are vulnerable due to aggressive environment, demand beyond the design level, and other contingencies such as extreme events. The management of bridges represents a significant challenge for improving transport performance and ensure the safety of users. In Italy, bridge management is addressed by the recent “Guidelines for risk classification and management, safety evaluation and monitoring of existing bridges” which were issued by the Italian Ministry for Public Work in 2020. The guidelines propose an operational approach with distinctive characteristics: (i) risk-based, i.e., based on the typical parameters of hazard, vulnerability, and exposure; (ii) multi-level, i.e., they include six assessment levels (0-5) of increasing complexity; and (iii) multi-risk, i.e., they assess structural/foundation, seismic, hydrological and landslide risk. This paper presents a general overview of the 2020 Italian Guidelines and their application to a selected case study. Lessons from the application to the case study are drafted and possible criticalities highlighted.
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