Full structural dynamic response from ambient vibration of Giotto's bell tower in Firenze (Italy), using modal analysis and seismic interferometry. (March 2019)

• Record Type: Journal Article
• Authors: Lacanna, G.; Ripepe, M.; Coli, M.; Genco, R.; Marchetti, E.
• Is Part Of: NDT & E international. Volume 102(2019)
• Page Start: 9
• Page End: 15
• Publication Date: 2019-03
• Subjects: Seismic interferometry -- Dynamic identification -- Seismic wave dispersion -- Giotto's bell tower -- Structural health monitoring; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2018.11.002
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: The preservation of historical buildings mainly depends on our capacity to monitor their ageing and quickly detect potential damage. We show how the dynamic characteristics of a building (i.e., frequency, shapes mode and seismic wave velocity) can be automatically identified and tracked in real-time by combining modal analysis with seismic interferometry. The assessment of these characteristics is performed on Giotto's bell tower in Firenze, Italy, by installing a temporary network of seismic sensors. The natural frequencies and modal shapes of the structure are calculated by enhanced frequency domain decomposition (EFDD). The impulse response functions estimated by following a waveform deconvolution approach are analysed to investigate the seismic wave dispersion in Giotto's bell tower. We show that Giotto's bell tower is a dispersive structure affected by a bending deformation, with a weak contribution from soil-system interaction. Combining the results of operational modal analysis (OMA) and seismic interferometry from the same ambient noise recording provides a unique and complete dynamic response of important monuments such as Giotto's bell tower.