Ambient vibration recording on the Maddalena Bridge in Borgo a Mozzano (Italy): data analysis.

Abstract

This paper reports on a vibration measurements campaign performed on the medieval Maddalena Bridge, also known as the "Devil's Bridge", in Borgo a Mozzano (Italy), one of the most fascinating in Italy. This 11 th century masonry bridge, supported by four circular arcades, crosses the Serchio River for about one hundred meters. Information on the dynamic response of the structure have been obtained through a wholly nondestructive technique, by measuring the environmental vibrations affecting the structures. A monitoring system has been fitted on the external surface of the bridge in order to evaluate its dynamic response to vibrations originating in the adjacent railway and two nearby roads. The natural frequencies and mode shapes of the structure and the corresponding damping ratios have been obtained by analyzing the recorded data using different techniques of Operational Modal Analysis. Lastly, a finite-element model of the bridge has been calibrated to fit the experimental data. Figure 15. The eighth mode shape calculated via the NOSA-ITA-CA code.

Model Updating Procedure to Enhance Structural Analysis in FE Code NOSA-ITACA

“…The plot of function ( ) Φ E , whose minimum is attained at 7.3951GPa = opt E , is reported in Figure 19. As pointed out in Azzara et al 2017, the high resulting value of the Young's modulus can be regarded as an initial, dynamic value of the high quality masonry constituting the Maddalena bridge. Figure 20 shows the numerical mode shapes (from 1 to 6 from the left) of the bridge model corresponding to opt E E = , calculated via the NOSA-ITACA code.…”

“…To this end, four SARA SS20 seismometric stations were used, arranged in different layouts over the bridge during five different tests. Details on these measurements are given in Azzara et al, 2017. Table 6 reports the values of the bridge's first six natural frequencies obtained from the experimental data and averaged over the five tests.…”

“…Table 6 reports the values of the bridge's first six natural frequencies obtained from the experimental data and averaged over the five tests. The corresponding experimental mode shapes were extracted from the data and are shown in Figure 17 (Azzara et al, 2017).…”

“…The experimental data are provided inAzzara et al 2017, along with their variance. The relative accuracy reported for the measured frequencies is in the range bounded by the singular values in…”

Structural health monitoring baseline of Gómez Ortiz bridge using ambient vibration tests

“…Estos cambios podrían ser indicadores de daño y contribuyen a tomar decisiones a tiempo para su oportuna intervención, mantenimiento o reparación [1]. Aunque en el nivel internacional se ha puesto en evidencia un desarrollo importante en el monitoreo de la salud estructural para puentes [2]- [4], en Colombia apenas se han realizado algunos trabajos en esta dirección [5]- [9]. Esta brecha del uso del monitoreo estructural en Colombia se debe en gran parte a la escasa existencia de puentes de envergadura, puesto que la mayoría de los puentes existentes hacen parte de vías con un volumen de tráfico bajo.…”