PSI - Issue 84

Marco Civera et al. / Procedia Structural Integrity 84 (2026) 49–56

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counter-slabs in lateral utility ducts and of cantilever slabs between the decks’ beams; the installation of further waterproofing and a new drainage system to prevent infiltration at longitudinal joints. The new R.C. elements were all realised with improved R.C. (R ck > 45 N/mm 2 ). All these aspects are detailed in the Structural Calculation Report of the interventions (Cavallone & Napoli, 2007). Finally, the static tests of the finished retrofitting works were concluded on July 5, 2011. After these extensive works, the Amedeo VIII Bridge has been recurrently inspected by the dedicated technical offices of the Turin Municipality. Finally, preliminary surveys were also performed by the members of the ISABHEL consortium on several occasions from July 2023 to August 2025, documenting a good condition of the retrofitted and reinforced superstructure. For this motivation, monitoring of the decks’ vibrational response was deemed unnecessary, as no relevant damage-induced stiffness reduction is expected in the short to mid term. Hence, the SHM system, detailed in the following two Sections, is primarily focused on inclinometer data, intended to capture potential losses of verticality caused by scour-induced pier rigid rotation, and strain data localised at the half-joints.

(a)

(b)

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Fig. 4. Outcomes of tendon stress monitoring, in N/mm 2 , referring to one day of static tests (April 20th, 2011). (a) P4-SPD span, (b) P1-P2 span, (c) SPS-P1 span. The plots above correspond to the truck loads configuration below. 3. The developed SHM apparatus The sensor typologies were selected based on the perceived structural risks (mainly, scouring at piers and fragile sudden collapse at half-joints), as detailed in the previous Section. All these considerations also informed the placement and quantity of the physical sensors, aiming at defining Data-Driven Alert Thresholds. The core idea of the overall ISABHEL project is then to combine conventional monitoring systems, based on physically-attached sensors, with Proximal (specifically, photomonitoring) and Remote Sensing (satellite interferometry).

3.1. Physically-Attached sensors

The monitoring system is designed to provide the following performance parameters: (i) static deformation due to the deck’s own and permanently carried weight loads (via inclinometers installed on decks), (ii) inclination of the piers and potential loss of verticality (via other, dedicated inclinometers), (iii) potential accumulations of mechanical