Articolo in rivista, 2021, ENG, 10.1177/1475921720987544

An integrated approach for structural behavior characterization of the Gravina Bridge (Matera, Southern Italy)

Serlenga V.; Gallipoli M.R.; Ditommaso R.; Ponzo C.F.; Tragni N.; Perrone A.; Stabile T.A.; Calamita G.; Vignola L.; Carso R.F.; Pietrapertosa D.; Lapenna V.

a National Research Council of Italy (CNR-IMAA), 85050 Tito Scalo, (PZ), Italy b School of Engineering, University of Basilicata, Potenza, Italy c SISIA S.r.l, Venosa, PZ, Italy d Villa d'Agri, (PZ), Italy

An integrated geophysical approach using non-invasive, non-destructive, and cost-effective seismic and electromagnetic techniques has been implemented to recognize the static and dynamic properties (i.e. eigenfrequencies, equivalent viscous damping factors, and related modal shapes) of the Gravina Bridge and its interaction with foundation soils. The "Gravina" is a bow-string bridge located on outcropping calcarenites in the city of Matera (Southern Italy) and develops for 144 m along a steel-concrete deck. The foundation soil characteristics have been evaluated by means of three high-resolution geo-electrical tomographies, one Vs velocity profile, and two site amplification functions. The main structural characteristics of the bridge have been estimated through permanent and on-demand monitoring using seismic and electromagnetic sensing. The former consisted of accelerometers and velocimeters installed with different geometrical arrangements for permanent earthquake and on-demand ambient vibration test recordings. The electromagnetic sensing was realized by a microwave radar interferometer placed below the deck to measure the displacements of the whole scenario illuminated by the antenna beam providing a continuous mapping of the static and dynamic displacements of the entire target. Acquired data have been analyzed in both frequency and time-frequency domain with the aim to study the stationary and non-stationary response of the monitored bridge. These experimental campaigns allowed us to assess the robustness of the proposed approach and to set up the zero-time reference point of the bridge dynamic parameters.

Structural health monitoring 20 (6), pp. 3371–3391

Keywords

Damping factors, eigenfrequencies, Gravina Bridge, modal shapes, permanent and on-demand seismic and electromagnetic monitoring, Structural health monitoring

CNR authors

Serlenga Vincenzo, Tragni Nicola, Perrone Angela, Lapenna Vincenzo, Gallipoli Maria Rosaria, Stabile Tony Alfredo, Calamita Giuseppe

CNR institutes

IMAA – Istituto di metodologie per l'analisi ambientale