PSI - Issue 84

Laura Ierimonti et al. / Procedia Structural Integrity 84 (2026) 959–966

963

Fig. 2. (a) Stabilization diagram of the Volumni Bridge (24th April, 2024, 11:00 a.m.) and first four mode shapes. (b) Sketch of the bridge and sensor deployment.

Two different FE models are built and calibrated accounting for the original design drawings: (i) FEM A and (ii) FEM B . In FEM A the deck was represented as a continuous beam with variable geometry, using 22 sections for each central span and 11 for each end span. To retrieve modal displacements at the sensor locations, rigid links and a flexible shell layer were added at deck level. The piers were modelled using prismatic beam elements with fixed bases.

Table 1. Model calibration.

Exp. FEM A ∆ FEM A − MAC FEM A FEM B ∆ FEM − MAC FEM ∆ FEM − FEM − 1 0.882 0.890 0.862 0.95 0.907 2.89 0.962 -1.97 0.99 FEM A FEM B FEM A - FEM B

No.

Type

-

1st order bending 1st order bending 1st order bending 2nd order bending 2nd order bending 2nd order bending 1st order torsional 1st order torsional 3rd order bending

2 1.342 1.285 -4.214 3 1.830 1.742 -4.818 4 3.880 3.787 -2.397 5 4.480 4.402 -1.749 6 4.823 4.730 -1.939

0.90 0.89 0.89 0.80 0.87 0.84 0.87 0.77 0.93

1.308 -2.5149

0.915 0.867 0.804 0.834 0.889 0.818 0.827 0.759 0.859 0.799 0.795

-1.74 0.14 -3.90 -2.18 -1.54 -1.66 -1.11 -1.21 0.31

0.99 0.99 0.88 0.98 0.98 0.96 0.70 0.98 0.73 0.79 0.69

1.740 3.941 4.500 4.804 5.237 5.316 6.556 9.715

-4.96 1.57 0.45 -0.39 4.93 -3.52 4.65 -0.57

7 4.991 5.150

3.194

8 5.510 5.255 -4.621

9 6.265 6.477

3.387

10 9.771 9.746 -0.259 11 11.172 11.323 1.351 12 11.768 11.631 -1.166

1st/2nd order torsional

0.73 11.507 2.30 0.78 11.689 -0.68

1.6

3rd order torsional 3rd order torsional

0.49