Dynamic response of the Baptistery of San Giovanni in Florence, Italy, based on ambient vibration test

Lacanna, Giorgio; Ripepe, Maurizio; Marchetti, E.; Coli, Massimo; Garzonio, Carlo Alberto

doi:10.1016/j.culher.2016.02.007

Cited by 34 publications

(27 citation statements)

References 17 publications

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“…, as well as the 3 Hz frequency of the building adjacent to the tower, along the x direction. As a result of anthropogenic activity, the power frequency increases in the entire band during the daytime, in particular during week-ends (18)(19)(25)(26). The threedimensional spectrogram of channel x plotted in Figure 17 also highlights other anthropogenic activity between 20 and 25 Hz, which could be attributed to traffic in the historic centre.…”

Section: Data Analysis and Resultsmentioning

confidence: 94%

“…With regard to the world's architectural heritage and monuments, the first examples of dynamic monitoring through ambient vibrations for damage detection purposes date back to (Gentile and Saisi, 2007), and (Ramos et al, 2010). A great deal of effort has been made to study the effects of traffic on ancient monuments, noteworthy amongst which is the work of (Pau and Vestroni, 2008) and (Bongiovanni et al, 2017) on dynamic characterization of the Colosseum, (Roselli et al, 2017) on other monuments in Rome, (Chiostrini et al, 1995), (Lacanna et al, 2016) and (Lacanna et al, 2019) in the historic centre of Florence, and (Erkal, 2017) The present paper is aimed at investigating the dynamic behaviour of a medieval tower located in a historic centre and subjected to vibrations from the surrounding environment, the main goals being: to characterize the main sources of vibration, the trend of the tower's dynamic properties over time, and the tower's response to the activities in the historic centre. To this end, we rely on a dataset obtained from five months of continuous measurements (November 2017 to March 2018) on the socalled "Torre delle Ore" (henceforth Clock Tower) in the historic centre of Lucca.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ambient Vibrations of Age-old Masonry Towers: Results of Long-term Dynamic Monitoring in the Historic Centre of Lucca

Azzara

Girardi

Iafolla

et al. 2019

International Journal of Architectural Heritage

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The paper presents the results of an ambient vibration monitoring campaign conducted on so-called "Clock Tower" (Torre delle Ore), one the best known and most visited monuments in the historic centre of Lucca. The vibrations of the tower were continuously monitored from November 2017 to March 2018 using high-sensitivity instrumentation. In particular, four seismic stations provided by the Istituto Nazionale di Geofisica e Vulcanologia and two three-axial accelerometers developed by AGI S.r.l., spin-off of the Istituto Nazionale di Astrofisica, were installed on the tower. The measured vibration level was generally very low, since the structure lies in the middle of a limited traffic area. Nevertheless, the availability of two different types of highly sensitive and accurate instruments allowed the authors to follow the dynamic behaviour of the tower during the entire monitoring period and has moreover provided cross-validation of the results.

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Section: Data Analysis and Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Ambient Vibrations of Age-old Masonry Towers: Results of Long-term Dynamic Monitoring in the Historic Centre of Lucca

Azzara

Girardi

Iafolla

et al. 2019

International Journal of Architectural Heritage

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“…The EFDD method is presented in literature by many authors [2,3,8,13,14,15] as a frequency domain technique for operational modal analysis of structures. In the present study, we performed an automatic EFDD method, first presented by Brincker et al (2007) [13] and further developed by Rainieri and Fabbrocino et al (2010) [2], to extract automatically the modal parameters of the structures.…”

Section: Operational Modal Analysmentioning

confidence: 99%

Integrating Modal Analysis and Seismic Interferometry for Structural Dynamic Response: The Case Study Giotto’s Bell Tower in Florence (Italy)

Lacanna¹,

Lancellotta²,

Ripepe³

2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The preservation of historical building requires monitoring their long-term behaviour as well as to quickly detect possible damage. In this respect, dynamic characteristics (frequency, shapes mode and seismic wave velocity) can be identified and tracked in real-time combining modal analysis with seismic interferometry, as it is shown in this paper for the Giotto's Bell-Tower in Firenze (Italy) by using a temporary seismic network. Natural frequencies and modal shapes of the structure are calculated by classic Enhanced Frequency Domain Decomposition (EFDD). Changes of the modal frequencies may reflect changes in the dynamic properties of the building and/or in the soil-structure interaction effects. The effects of soil-structure interaction are analysed with the seismic velocity and transfer function of the structure estimated using seismic interferometry technique. Seismic wave velocity inside the building depends only on the structural properties of the building and it is uncoupled from the soil-structure interaction system. The results of seismic interferometry (i.e fixed-base frequency, pseudo-flexible body frequency) combined with the first modal frequency allow to define the degree of the soil-structure interactions on the dynamic behavior of the Giotto's bell tower. The full structural dynamic identification shows a weak contribution of the soilstructure interaction, that is supported by the high values of the horizontal and rocking stiffness, evaluated from the geotechnical properties of the soil. It is suggested that integrating the Operational Modal analysis and the seismic interferometry of the same ambient noise recording provides a unique and complete dynamic response of one of the worldwide important monument like the Giotto's Bell-Tower.

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“…The reason for this high interest is the fact that heavy mass of masonry, complex geometry, anisotropy and high heterogeneity represent the main difficulties for the seismic analysis of these buildings [8]. For a building of cultural heritage, most attention is paid to the modelling of individual buildings and assessment methods based on non-destructive procedures [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Spectral Functions of Damage Index (DI) for Masonry Buildings with Flexible Floors

et al. 2018

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Most of the buildings in old city cores of Croatia, built between 1860 and 1920 with wooden floors, are mainly designed to bear vertical loads. In this paper we propose a methodology for seismic vulnerability assessment of unreinforced masonry buildings with flexible floors. The methodology is based on the calculation of Damage Index (DI), a numerical value indicating the level of structural damage. In this methodology, the structure is represented using an SDOF model determined by damping, weight, elastic base shear capacity, elastic stiffness and post-elastic stiffness. Using accelerograms of earthquakes, step by step time-history numerical integrations are provided along with the results: top displacement, yield excursions, cumulative energy and base shear-displacement. These results serve as parameters which are then input in the formula for Damage Index (DI). The results of the paper are presented in the form of diagrams with DI values on the y axis and fundamental period of the structure on the x axis. These spectral functions of DI, along with knowledge of fundamental period and chosen accelerogram, can be used to quickly determine the level of damage for unreinforced masonry buildings with flexible floors.

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Dynamic response of the Baptistery of San Giovanni in Florence, Italy, based on ambient vibration test

Cited by 34 publications

References 17 publications

Ambient Vibrations of Age-old Masonry Towers: Results of Long-term Dynamic Monitoring in the Historic Centre of Lucca

Ambient Vibrations of Age-old Masonry Towers: Results of Long-term Dynamic Monitoring in the Historic Centre of Lucca

Integrating Modal Analysis and Seismic Interferometry for Structural Dynamic Response: The Case Study Giotto’s Bell Tower in Florence (Italy)

Spectral Functions of Damage Index (DI) for Masonry Buildings with Flexible Floors

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