PSI - Issue 44

Emanuele Renzi et al. / Procedia Structural Integrity 44 (2023) 737–744 Emanuele Renzi et al./ Structural Integrity Procedia 00 (2022) 000–000

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MIT

Ministry of Infrastructures and Transportation Ministry of Infrastructure and Sustainable Mobility

MIMS CNR

National Council of Research Superior Council of Public Works

CSLLPP ANSFISA FABRE

National Agency for Safety of Railways and Roads

Research consortium for the evaluation and monitoring of bridges, viaducts and other

structures Bridge Guidelines

Italian guidelines for classification, safety assessment and monitoring of existing bridges

OI

Operating Instructions for application od Bridge Guidelines Italian Technical Standards for Constructions

NTC

AC

Attention Class

ADT

Average Daily Traffic

2. Risk classification according to existing Bridges Guidelines The classification of bridges on a territorial scale consists in the estimate, simplified and expeditious, of the "risk" factors associated with the roadworks, surveyed, and inspected in Levels 0 and 1 as reported in Bridge Guidelines. The classification method provides for the determination, for each bridge, of the so-called "Overall Attention Class" that is determined by the combination of 4 partial ACs linked to 4 different types of risk. The determination of each overall AC is the result of the combination of hazard, vulnerability, and exposure factors, using classes and logical operators. ACs allow to: • weigh separately the defects, present according to severity without reducing the evaluation to a single index; • immediately distinguish bridges characterized by serious damage (even if localized) on critical elements.

Fig. 1. Determination of overall AC starting from partial Acs. The analysis for flows and logical operators.