PSI - Issue 44

Corrado Chisari et al. / Procedia Structural Integrity 44 (2023) 1100–1107 Corrado Chisari et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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connected to the church, was not expected to play a dominant role in the dynamic response of the structure. For the convenience of the reader, in the following the positive y- direction is assumed parallel to the longitudinal wall from the façade towards the apse.

(a)

(b)

Fig. 2. Experimental setup for AVT: (a) view of one accelerometer, and (b) position of the sensors. Accelerometers are identified by B/T (biaxial/triaxial).

Acceleration data were acquired at 100 Hz sampling rate for 20 minutes. Several acquisitions were performed at different times to verify repeatability of data. Since every thirty minutes the bells swung, exciting the tower, in this paper the results obtained from one acquisition including such excitation are considered. 3.2. AVT results In Fig. 3 time history measurements after baseline correction are reported for the six sensors. The increase in acceleration amplitude due to bell swinging is visible between 350 to 450 s from the beginning of the acquisition. Overall, very low-amplitude measurements were recorded, but a very good signal-to-noise ratio was allowed by the sensors used.

Fig. 3. Time history acceleration measurements.