An approach for the mechanical characterisation of the Asinelli Tower (Bologna) in presence of insufficient experimental data

Palermo, Michele; Silvestri, Stefano; Gasparini, Giada; Baraccani, Simonetta; Trombetti, Tomaso

doi:10.1016/j.culher.2014.05.002

Cited by 17 publications

(15 citation statements)

References 5 publications

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“…The total thickness of the masonry decreases almost linearly from 3.15 m at the base to 0.45 m at the top. Three main discontinuities are present at 11.5, 34.0, and 56.0 m ( Figure 1B; Palermo et al, 2015). The nearby Torre Garisenda, older than the previous one, has a height of 48 meters and a large overhang (3.40 toward South-East) due to a strong subsidence of the foundation ground.…”

Section: Garisenda and Asinelli The Two Towersmentioning

confidence: 90%

“…In this regard, some of the authors developed FE models of increasing complexity (mono and bi-dimensional models considering different base conditions) to compare the results of the modal analysis with the frequencies obtained from the first dynamic monitoring campaign (Palermo et al, 2015). The models were built according to the results of few material tests and did not account for the presence of the openings.…”

Section: Fundamental Frequencies From Fe Modelsmentioning

confidence: 99%

“…First, the attention is paid in the identification of the main dynamic properties of the Two Towers and their variation with traffic-induced vibrations. The dynamic properties obtained from the monitoring are then compared with those computed from Finite Element (FE) models, considering both a new FE model of the Garisenda Tower and available FE models of the Asinelli Tower developed in the past by Palermo et al (2015). Then, an analysis of selected time history is conducted to evidence specific effects due to ambient sources or traffic-induced vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Seismometric Monitoring of the Two Towers of Bologna (Italy): Modal Frequencies Identification and Effects Due to Traffic Induced Vibrations

Baraccani

Azzara

Palermo

et al. 2020

Front. Built Environ.

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The rise of human activities and the constant increase of vehicles traffic in the cities, and in particular of heavy vehicles such as buses and trucks, causes continues ambient vibrations that can detrimentally affect the conservation of built artifacts, especially historical constructions. The effects of urban vibrations on buildings and monuments are far from being fully investigated. In general, peak levels of traffic-induced vibrations are rarely high enough to be the main cause of heavy structural damages. On the other hand, they contribute to the process of deterioration by adding extra stresses-through fatigue damage accumulation occurring as a result of long periods of exposure to low levels of vibration-or by contributing to soil densification-which can lead to the settlement of building foundations. As such, the estimation of threshold levels above which traffic-induced vibrations may cause damages to monumental buildings requires specific studies including long-time monitoring campaigns. Data from experimental campaign can, indeed, be used to extract information on the variation of dynamic properties of buildings, thus providing valuable pieces of information for a complete knowledge to plan effective preservation interventions. The present work aims to identify the effects of traffic induced urban vibrations on the two Towers of Bologna, particularly prone to fatigue-related damages and close to a high transit of vehicles, through a preliminary analysis of data from several dynamic monitoring campaigns conducted during the last years.

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Section: Garisenda and Asinelli The Two Towersmentioning

confidence: 90%

Section: Fundamental Frequencies From Fe Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-Term Seismometric Monitoring of the Two Towers of Bologna (Italy): Modal Frequencies Identification and Effects Due to Traffic Induced Vibrations

Baraccani

Azzara

Palermo

et al. 2020

Front. Built Environ.

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“…The total thickness of the masonry decreases almost linearly from 3.15 m at the base to 0.45 m at the top. Three main discontinuities are present at 11.5 m, 34.0 m and 56.0 m ( Figure 1b) [4]. The Garisenda, the older one, can be dated around the last two decades of the eleventh century.…”

Section: Garisenda and Asinelli Towermentioning

confidence: 96%

“…FE models of increasing complexity (mono and bi-dimensional models considering different base conditions) have been developed and the results of modal analysis were compared with the data recorded by the dynamic monitoring. Details are available in [10]. In this work, to investigate the phenomenon of frequency splitting and of beating (that will be presented in the next sections), a further FE model of the Asinelli Tower has been developed.…”

Section: Ambient Modal Frequencies Identification and Modelingmentioning

confidence: 99%

Identification Through Seismometric Measurements of Transients Propagating Inside the Asinelli and Garisenda Towers (Bologna, Italy), Implication on Structural Modeling and State of Health Monitoring

Baraccani¹,

Azzara²,

Gasparini³

et al. 2019

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

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The SHM has a very important role in the diagnostic process of cultural heritage buildings, for which generally, the identification of the structural behaviour is affected by many uncertainties. The use of ambient vibration tests allow to characterize the dynamic behavior of the structures, providing also information to validate numerical modeling. Moreover, continuous monitoring allows to record streams of seismic ambient noise for long time intervals in order to retrieve the temporal evolution of the structural characteristics and to highlight the response of them to seasonal variations of environmental parameters (temperature, humidity) and the stresses due to the human activities or to the rapid (daily or weekly) changes in the ambient conditions (temperature, wind velocity and intensity). Three seismic monitoring experiments were performed in 2012, 2013 and 2014 at the Asinelli and Garisenda Towers, two masonry leaning tower built in the center of Bologna (Italy). The aim of this work is to present the results of the analysis of the data recorded by seismic monitoring that allowed to clearly identify the normal modes of oscillation of the Two Towers. A particular attention was devoted to the identification of transient that, propagating inside the structures, produce beating effects at the top stations. Implication to the structural modeling and to the State of health monitoring are discussed.

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A time domain approach for data interpretation from long‐term static monitoring of historical structures

Baraccani

Palermo

Gasparini

et al. 2021

Struct Control Health Monit

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Summary The conservation of historical buildings requires periodic inspections, maintenance, and/or strengthening interventions, resulting in significant costs. The accurate estimate of the structural condition may contribute to optimize the allocation of resources. With the diffusion of innovative technologies of Structural Health Monitoring (SHM), several permanent monitoring systems have been installed in the last decades in historical buildings. This fact has encouraged investigations about methods for the assessment of structural health based on recorded data. The aim of this study is to introduce a time‐domain approach for the analysis and interpretation of large amount of data from long‐term static monitoring of historical masonry structures. It is assumed that the recorded signals can be decomposed into two main components: a periodical one, mainly due to environmental actions, and a non‐periodical component related to potential variations in the state of conservation of the structure. The analysis of the two components is conducted through specific descriptors (here referred to as “reference quantities”) by means of statistical evaluations. Such reference quantities could be used as the roots for the establishment of standardized procedures for data analysis and interpretation. The approach has been applied to analyze data from the SHM system of the Two Towers of Bologna (Italy).

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An approach for the mechanical characterisation of the Asinelli Tower (Bologna) in presence of insufficient experimental data

Cited by 17 publications

References 5 publications

Long-Term Seismometric Monitoring of the Two Towers of Bologna (Italy): Modal Frequencies Identification and Effects Due to Traffic Induced Vibrations

Long-Term Seismometric Monitoring of the Two Towers of Bologna (Italy): Modal Frequencies Identification and Effects Due to Traffic Induced Vibrations

Identification Through Seismometric Measurements of Transients Propagating Inside the Asinelli and Garisenda Towers (Bologna, Italy), Implication on Structural Modeling and State of Health Monitoring

A time domain approach for data interpretation from long‐term static monitoring of historical structures

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