PSI - Issue 62

Eleonora Bruschi et al. / Procedia Structural Integrity 62 (2024) 299–306 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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girder decks with an average span of 22.10 m and a maximum span of 22.30 m. The decks are each made up of four PT beams, four PT diaphragms and a reinforced concrete slab, Fig. 2 (a) and (b).

(a)

(b) Fig. 2. (a) Longitudinal section and (b) transversal section of the bridge.

2.1. Phase 0: knowledge and samples choice The final outcome of Phase 0 must be the number of samples, which coincides with the number of cables to investigate. In order to collect all the data required for this purpose it is necessary an historical-critical review of the available original documentation and the assessment of PT system defectiveness according to Level 2 of the Italian Guidelines (MIT CSLP 2020). First of all, it is necessary to identify all those parameters related to the PT system that may be susceptible to degradation creating a risk for the structure. These parameters are related to the technology and materials used for the bridge construction and can be obtained directly from the historical-critical analysis. The information obtained from the design documentation do not lead to the identification of intrinsic vulnerabilities, which instead are detected only during the inspection phase. Some fundamental information about the PT system, as the number of cables and its composition and qualitative layout (Fig.3), are available from the documents of the Dora Riparia River Bridge, but there is no indication of the coordinates of the cable route along the longitudinal axis of the beams.

Fig. 3. Qualitative cables’ layout in the edge beams and internal beams.