PSI - Issue 84

Marco Pirrò et al. / Procedia Structural Integrity 84 (2026) 552–559

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the passage of heavy vehicles. Corresponding to these time instants, the bridge's deformed shape estimation procedure is automatically activated, and the maximum displacement values are compared with those obtained during the load tests and from numerical simulations. Figure 8 shows the deflection curves estimated from the rotation values measured on July 13, 2022, at 08:34. Specifically, the threshold rotations defined at the internal supports were exceeded due to the passage of a heavy vehicle, and consequently, the relative deflections curves were calculated. Figure 8 clearly exemplifies the vehicle's transit on the lane associated with the downstream side, entering from the left (Fig. 8a) and exiting to the right (Fig. 8d). It is further noticed that the maximum estimated displacement is equal to 24.2 mm.

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(b)

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Fig. 6. Deflection curves that were estimated: (a) using longitudinal rotations and free vertical displacement of intermediate piers; (b) using transverse rotations and free vertical displacement of intermediate piers; (c) using transverse rotations and zero vertical displacement of intermediate piers.

Fig. 7. Deflection curves that were estimated for a load condition centered on the left-hand span.