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

Foti, Dora; Ivorra, Salvador; Sabbà, Maria Francesca

doi:10.2174/1874836801206010384

Cited by 44 publications

(16 citation statements)

References 10 publications

(11 reference statements)

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“…In this perspective an extensive testing campaign and an accurate dynamic identification will give more realistic results of the level of damage. Applications are found in [14][15][16][17][18][19] where EFDD and SSI methods and Peak Picking technique for output-only signals are used to identify the parameters of the structures.…”

Section: Mode Shapes Curvature Methodsmentioning

confidence: 99%

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Foti

2013

TOBCTJ

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Damage detection in civil engineering structures using changes in measured modal parameters is an area of research that has received notable attention in literature in recent years. In this paper two different experimental techniques for predicting damage location and severity have been considered: the Change in Mode Shapes Method and the Mode Shapes Curvature Method. The techniques have been applied to a simply supported finite element bridge model in which damage is simulated by reducing opportunely the flexural stiffness EI. The results show that a change in modal curvature is a significant damage indicator, while indexes like MAC and COMAC -extensively and correctly used for finite element model updating -lose their usefulness in order to damage detection.

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Section: Mode Shapes Curvature Methodsmentioning

confidence: 99%

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Foti

2013

TOBCTJ

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“…In this way it is possible to apply simplified boundary conditions instead of modeling the entire adjacent structure". Some examples are [43], [44] and [38]. To evaluate the calibrated parameters in the time domain, the real and the numerical response of the tower for the experimental test were compared (Fig.…”

Section: Effect Of Tower Confinement and Modal Updatingmentioning

confidence: 99%

Parametric dynamic interaction assessment between bells and supporting slender masonry tower

Bru

Ivorra

Betti

et al. 2019

Mechanical Systems and Signal Processing

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Recent years have seen a growing interest toward implementation and testing of structural health monitoring techniques for cultural heritage structures, and many scientific papers report on the application of operational modal strategies as an effective knowledge-based tool for vulnerability reduction of masonry buildings. Focusing on historic masonry bell-towers, being such structures particularly prone to earthquake-induced damage, the most part of the studies discuss structural monitoring and vibration-based identification methods with the goal of their seismic protection. As a consequence, while there is great number of researches that investigate masonry towers behaviour under earthquake loads, only a few scientific papers discuss their structural response under service loads such as bell-loads. This issue is also of paramount importance, since in many real cases the bellringing has been stopped due to the dynamic interaction phenomena that are activate between the bells and the host structure. With the aim to contribute of improving the knowledge in this field, this paper focuses on a methodology for the study of the dynamic interaction between bells and slender masonry towers. The proposed methodology is divided into four phases: (i) Geometric and structural characterization of the tower and bells; (ii) Evaluation of the dynamic forces generated by the swinging bells; (iii) Experimental campaign to characterize the dynamic properties of the tower by means of operational modal analysis; (iv) Parametric finite element analysis. To illustrate the methodology, a real case of masonry bell-tower in which bell-ringing had to be stopped due to a history of strong vibrations is discussed. The paper includes a method of analysing the dynamic properties of masonry bell-towers, in which the dynamic interaction between the harmonic bell forces and the fundamental tower modes is analysed by means of a calibrated numerical model and the dynamic amplification factor.

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“…With respect to masonry heritage structures, SHM strategies can be classified as dynamic or static. Dynamic monitoring involves the identification and control of dynamic properties such as natural frequencies, mode shapes and damping ratios 1,2 whereas static monitoring involves the continuous measurement of key slow-varying parameters over a long time period. 3 Although dynamic SHM can prove to be extremely useful to correctly assess the vulnerability of structures to dynamic loads and to evaluate the effectiveness of repairs, static monitoring is particularly suitable for the early identification of very slow damage mechanisms characterised by slow evolution rates.…”

Section: Introductionmentioning

confidence: 99%

Static structural health monitoring and automated data analysis procedures applied to the diagnosis of a complex medieval masonry monastery

Makoond

Pelà

Molins

et al. 2020

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2020

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Static structural health monitoring (SHM), aimed at the continuous measurement of slow-varying parameters over a long period, has been proved to be a powerful tool to support the diagnosis of masonry heritage structures. In such applications, the initial interpretation task involves the identification of evolutionary conditions from recorded data. However, this can be difficult since monitored features are influenced by environmental changes. In addition, many masonry heritage structures are characterised by a complex structural behaviour stemming from the interaction among different elements, making the task of interpreting SHM data for diagnosis very challenging. One such structure is the church of the monastery of Sant Cugat close to Barcelona, built mostly between the 12th and 15th centuries. Certain key structural parameters of the church have been monitored since 2017 with the aim of understanding the cause of visible pathologies and identifying any active deterioration mechanisms that could pose a threat to the structural integrity of the church in the future. This paper presents the application of an automated data analysis methodology to this problem. The method uses dynamic regression models to filter out components related to reversible seasonal fluctuations from measurements and automatically classifies monitored parameters into evolutionary states based on predicted evolution rates and dispersion metrics from the filtering procedure. A tool is presented which allows analysis results to be updated as new data is received. Finally, results from the proposed methodology are used for the diagnosis of the structure and their usefulness in a broader decision-making framework is discussed.

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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

Cited by 44 publications

References 10 publications

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Parametric dynamic interaction assessment between bells and supporting slender masonry tower

Static structural health monitoring and automated data analysis procedures applied to the diagnosis of a complex medieval masonry monastery

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