Ambient vibration testing, dynamic identification and model updating of a historic tower

Foti, Dora; Diaferio, Mariella; Giannoccaro, Nicola Ivan; Mongelli, Michele

doi:10.1016/j.ndteint.2011.11.009

Cited by 147 publications

(80 citation statements)

References 9 publications

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“…The final masonry mechanical properties used for FEM analysis are the elastic modulus (E) equal to 7500 MPa, the Poisson's modulus ( ) equal to 0.15 and the material density equal to 1700 Kg/m 3 . It was assumed a linear elastic mechanical behavior during the calibration.…”

Section: D Finite Element Modelmentioning

confidence: 99%

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Dynamic Investigation of an Ancient Masonry Bell Tower with Operational Modal Analysis - A Non-Destructive Experimental Technique to Obtain the Dynamic Characteristics of a Structure

Foti¹,

Ivorra²,

Sabbà

2012

TOBCTJ

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This paper shows the results of an experimental analysis on the bell tower of "Chiesa della Maddalena" (Mola di Bari, Italy), to better understand the structural behavior of slender masonry structures. The research aims to calibrate a numerical model by means of the Operational Modal Analysis (OMA) method. In this way realistic conclusions about the dynamic behavior of the structure are obtained. The choice of using an OMA derives from the necessity to know the modal parameters of a structure with a non-destructive testing, especially in case of cultural-historical value structures. Therefore by means of an easy and accurate process, it is possible to acquire in-situ environmental vibrations. The data collected are very important to estimate the mode shapes, the natural frequencies and the damping ratios of the structure.To analyze the data obtained from the monitoring, the Peak Picking method has been applied to the Fast Fourier Transforms (FFT) of the signals in order to identify the values of the effective natural frequencies and damping factors of the structure. The main frequencies and the damping ratios have been determined from measurements at some relevant locations. The responses have been then extrapolated and extended to the entire tower through a 3-D Finite Element Model. In this way, knowing the modes of vibration, it has been possible to understand the overall dynamic behavior of the structure.

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Section: D Finite Element Modelmentioning

confidence: 99%

“…In recent years, in fact, their particular geometrical characteristics have been a topic discussed in many research focused on the evaluation methods to discover the dynamic behavior of these structures in masonry [1], concrete [2][3][4] and reinforced concrete [5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Investigation of an Ancient Masonry Bell Tower with Operational Modal Analysis - A Non-Destructive Experimental Technique to Obtain the Dynamic Characteristics of a Structure

Foti¹,

Ivorra²,

Sabbà

2012

TOBCTJ

Self Cite

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“…Several applications of vibration-based techniques to masonry towers can be found in literature [9,10,11,12,13,14], due to the slenderness and quite simple requirements in the interpretation of the structural behaviour. This paper is focused on the analysis of two historical masonry towers, located in Perugia, in the centre of Italy, and is essentially divided in two parts: the San Pietro bell-tower and the civic Sciri tower, both masonry towers.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Testing and Monitoring of Historic Towers for Seismic Damage Detection

Kita¹,

Cavalagli²,

Comanducci³

et al. 2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. Structural health monitoring (SHM) systems represent an acknowledged low-invasiveness and low-cost solution enabling real time condition assessment of civil structures, providing useful information for preventive conservation and maintenance activities. The various documented successful applications of SHM systems to bridges and large infrastructural systems has recently led many researchers to investigate their effectiveness in the case of monumental and historical buildings, often vulnerable to both anthropogenic a natural (e.g. seismic) hazards. The countries in the Mediterranean Basin are especially committed to this kind of research, being, at the same time, rich of built cultural heritage and highly exposed to seismic and other natural hazards. Among the various types of historic buildings, Italian Cities are especially characterized by an extensive presence of bell and civic masonry towers, which also deserve a special attention because of their slenderness, making them suitably monitored via vibration-based systems, and because of their seismic vulnerability.Framing in the afore-depicted scenario, the authors have started in the last years a research activity on vibration-based permanent SHM of slender historic towers, finalized at the implementation of new approaches for the optimal management of the limited available budgets for conservation and restoration activities. In the present paper the results concerning this activity are presented with specific reference to two study cases in the city of Perugia, Italy: the bell tower of the Basilica of San Pietro and the civic tower called "Torre degli Sciri". The two considered monuments present completely different characteristics and complexities from both structural and architectural points of view, making them worth interesting investigating as typological benchmarks. The work discusses both ambient vibration testing and permanent mon-itoring applications, including considerations regarding the adopted sensing hardware. The feasibility of a rapid post-earthquake damage detection via SHM is finally explored with reference to the study case of the San Pietro bell tower, with particular attention to the recent seismic events.

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“…In fact, permanent SHM systems possess all the advantages of both AVT and OMA, being fully non-destructive and minimizing the interferences with the normal use of the structure but also allowing a continuous tracking of the actual condition of the structure, typically using a limited number of sensors. For these reasons, applications of vibration-based diagnostic and monitoring techniques to historic monumental buildings are becoming popular [7][8][9][10][11][12]. The authors have recently started a research project for monitoring of two relevant historical constructions in Italy: the bell-tower of the Basilica of San Pietro in Perugia and the dome of the Basilica of Santa Maria degli Angeli in Assisi.…”

Section: Introductionmentioning

confidence: 99%

Vibration-based SHM for cultural heritage preservation: the case of the S. Pietro bell-tower in Perugia

Comanducci

Cavalagli

Ubertini

2015

MATEC Web of Conferences

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Abstract. In the present work, multivariate statistical analysis techniques are newly applied in the field of condition assessment of cultural heritage structures. More specifically, the paper presents the design and the implementation of an SHM system for the bell-tower of the Basilica of San Pietro, one of the most relevant monuments of the city of Perugia, Italy. The system comprises three high-sensitivity accelerometers permanently installed on top of the tower and a remote server that automatically processes the data so as to acquire modal parameters and to use such information for novelty analysis and health assessment. In the paper, after a brief description of the permanent monitoring system installed on the structure and of the adopted SHM strategy, the results of the first months of continuous monitoring are presented. Later on, the potential capability of the aforementioned statistical techniques in damage detection is verified by using the continuously identified eigenfrequencies of the bell tower.

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Ambient vibration testing, dynamic identification and model updating of a historic tower

Cited by 147 publications

References 9 publications

Dynamic Investigation of an Ancient Masonry Bell Tower with Operational Modal Analysis - A Non-Destructive Experimental Technique to Obtain the Dynamic Characteristics of a Structure

Dynamic Investigation of an Ancient Masonry Bell Tower with Operational Modal Analysis - A Non-Destructive Experimental Technique to Obtain the Dynamic Characteristics of a Structure

Dynamic Testing and Monitoring of Historic Towers for Seismic Damage Detection

Vibration-based SHM for cultural heritage preservation: the case of the S. Pietro bell-tower in Perugia

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