Bridges and viaducts, off to the census and risk analysis

05/09/2022 – The program for the census and monitoring of existing bridges, viaducts, embankments and flyovers begins. In recent days the guidelines of the Ministry of Infrastructure and Sustainable Mobility (Mims) for risk management.

The guidelines dictate the timing for a series of actions that will lead to knowledge of all existing bridges and viaducts and the conditions in which they are found. Each structure will be assigned a risk class, on the basis of which the activities necessary for safety will be planned.

The document represents a update of the guidelines launched in 2020.

Bridges and viaducts, the guidelines

The guidelines provide for actions divided into several levels. It starts from “level 0”, represented by the census of existing works, to then conduct more and more in-depth analyzes.

Level 1 provides for visual inspections and the definition of critical elements. Level 2 includes the analysis of relevant risks, associated, for example, with the condition of the structures, seismic events, landslides and hydraulic risk.

Level 3 provides for the preliminary assessment of the work and involves a series of checks on any design errors and suitability for traffic loads.

Level 4 involves thorough verification, which includes knowledge of the bridge’s history, construction details and materials.

The actions end with the planning of any maintenance interventions.

Bridges and viaducts, census and risk analysis

The guidelines provide for different timescales for the census of existing works. Anas will have to register the structures within its competence by the end of 2022. Regions, Provinces and Metropolitan Cities will have until 31 December 2023, the Municipalities until 31 December 2024.

The document also dictates a series of deadlines for therisk analysis and the attribution of the level of attention, actions falling within “level 2”. The motorway concessionaires must complete monitoring by 30 June 2023, Anas by 31 December 2023, Regions, Provinces and Metropolitan Cities by 30 June 2025, Municipalities with a resident population greater than 15 thousand inhabitants by 30 June 2026 and Municipalities with a population less than 15 thousand inhabitants by 31 December 2026.

These deadlines apply only under normal conditions. In the presence of reports or events (for example seismic) that may have caused the deterioration of the structures, it is necessary to proceed with shorter times.

Source: Le ultime news dal mondo dell'edilizia by

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