Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: The Case Study of San Filippo Neri in Macerata

Baggio, Carlo; Sabbatini, Valerio; Santini, Silvia

doi:10.7712/120119.7186.18559

Cited by 4 publications

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“…In a dynamic system, the modal quantities are dependent on the mass, the stiffness, the damping and the boundary conditions of the model. During the Manual Tuning, these parameters are varied intuitively in order to approximate the experimental results [14].…”

Section: Manual Tuningmentioning

confidence: 99%

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Automated Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: the Case Study of San Giovanni in Macerata

Santini¹,

Baggio²,

Gai³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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Over the past few decades, the conservation and seismic assessment of historical buildings has gained great importance. In particular, the prediction of the dynamic response of masonry constructions plays a central role in retrofitting and conservation interventions. Finite element modelling has become the most common and accessible approach to study the behavior of complex masonry structures, however, the gap between numerical and experimental analysis may lead to erroneous results. This work describes the model updating procedure applied to the finite element model of San Giovanni's church in Macerata, condemned in October 2016 after the Central Italy Earthquake. The laboratory of Proof and Research on Structures and Materials of Roma Tre University carried out an extensive in-situ testing campaign including geometric survey, video endoscopy, flat-jack test, sonic tomography and ambient vibrations test in order to investigate the state of the building. The work involved both numerical and experimental analysis: the results of the testing campaign were interpreted and correlated with an accurate finite element model developed with the software Midas Gen. Operational modal analysis was performed in order to extract the modal parameters of the building (modal frequencies, shape vectors and modal damping). Material characteristics and boundary conditions were updated according to the Douglas-Reid method. In the end, the final model was compared to the initial model to evaluate and discuss the process.

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Section: Manual Tuningmentioning

confidence: 99%

“…𝑊 is a diagonal matrix necessary to normalize 𝑅 bc − 𝑅 /YZ since 𝑅 /YZ can reach different orders of magnitude. In this work, it was used the algorithm "fmincon" (find minimum of constrained nonlinear multivariable function) present in the software MATLAB [20] in order to minimize the objective function (14).…”

Section: )mentioning

confidence: 99%

Automated Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: the Case Study of San Giovanni in Macerata

Santini¹,

Baggio²,

Gai³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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“…The modal parameters of the church were assessed with the ambient vibration test (AVT) [18], the response acceleration of the construction was recorded for about one hour by 16 ICP piezoelectric accelerometers (PCB 393 B12, 10 V/g sensitivity, ±0.5 g range and 8 µg rms resolution) placed in seven points at two different levels: points A, B, C and D are located on the internal cornice of the drum at 16 m height and F, G, and C at 27.5 m height on the extrados of the dome in proximity of the lantern as shown in Figure 9. The data were processed according to the operational modal analysis (OMA), based on the assumption of white noise random vibrations.…”

Section: Onsite Testing and Dynamic Monitoringmentioning

confidence: 99%

“…The relationship between the experimental dynamic behavior and the model parameters depends on the heterogeneity of the materials, including the possibility of unidentified damage (i.e., crack, loss of material/detachment, loose interlocking and microcracks), and the interaction among the structural elements, in particular, at the foundation level. In addition, the complexity of the model increases the number of parameters; for these reasons, the initially examined parameters were chosen based on engineering judgment and the already demonstrated influence of the boundary conditions [18,28].…”

Section: Sensitivity Analysismentioning

confidence: 99%

Onsite Testing for Nonlinear Analysis of an Earthquake Damaged Historical Church in Italy

et al. 2021

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Analysis and diagnosis of historical masonry buildings are frequently affected by uncertainties due to unexpected behaviors caused by cumulative damage, material decay or transformations. This research work follows a methodology in the structural analysis of the historical masonry church of San Filippo Neri in Macerata, severely damaged after the Central Italy Earthquake occurred in October 2016. The PRiSMa laboratory (Proof testing and Research in Structures and Materials) of Roma Tre University carried out an extensive onsite testing campaign, including NDT tests as sonic tomography and endoscopy, and minor destructive technique as double flat jack test, together with dynamic monitoring under ambient vibrations, to investigate the state of conservation of the building. The onsite testing results were then implemented in an accurate finite element model, which was tuned up by means of global dynamic response provided by OMA (operational modal analysis) and updated, after the sensitivity analysis, through the Douglas-Reid method. Finally, nonlinear static and dynamic analyses were performed to investigate the state of damage of the church and reduce its uncertainties. This methodology will support the design of strengthening measures to achieve a higher level of safety concerning both needs of protection and conservation, thereby avoiding ineffectual or amiss interventions.

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“…In recent years, Structural Health Monitoring has had extraordinary success due to the sustainability of its techniques and the relevance of its results. Dynamic identification is a well-established technique; its results play a significant role in the prediction of the seismic response of the construction and they are commonly used as reference to update material properties and boundary conditions of complex numerical models [2]. However, the reliability of the results is subject to several uncertainties related to the acquisition and processing of data.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Identification of the So-Called Temple of Minerva Medica: Comparison of Different Instrumentations and Methods for Mutual Validation of the Results

Baggio¹,

Sabbatini²,

Santini³

et al. 2021

12th International Conference on Structural Analysis of Historical Constructions

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Dynamic monitoring is a well-established technique used to gain information on the global health of constructions. In particular, ambient vibration tests have achieved important results in the dynamic characterization of modal parameters. Several techniques and instrumentations are currently available, however the accuracy of these results is often unquestioned. The mutual validation between different modal analysis techniques is an important procedure to assess the reliability of the results. In the present paper the ambient vibration tests performed on the so-called 'Temple of Minerva Medica' in Rome considering different techniques and instrumentations will be described and compared. While it is referred to as the Temple of Minerva Medica, the structure is actually a ruined decagonal nymphaeum in opus latericium that dates to the 4th century AD. Today, the construction is located between the main central train station (Roma Termini) and the local tram way. Ambient vibration data were acquired during different campaigns [1] to characterize the effects of the vibrations and the modal parameters of the structure. This work deals with the data collected on the 11th of July 2019 within the project "Tecnologie per il miglioramento della Sicurezza e la ricostruzione dei centri Storici in area sismica" coordinated by DTC Lazio (Distretto Tecnologico beni e attività culturali). The instrumentation comprised of several seismographs equipped with triaxial velocimeters and piezoelectric accelerometers. A variety of techniques were applied to process the acquired vibration data in order to extract the modal parameters of the studied structure including PolyMAX, FDD, EFDD, CC-SSI, HVSR and FRF. Comparison of the modal parameters obtained by each different technique was considered to provide indications on the reliability of the instruments.

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Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: The Case Study of San Filippo Neri in Macerata

Cited by 4 publications

References 0 publications

Automated Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: the Case Study of San Giovanni in Macerata

Automated Model Updating of a Masonry Historical Church Based on Operational Modal Analysis: the Case Study of San Giovanni in Macerata

Onsite Testing for Nonlinear Analysis of an Earthquake Damaged Historical Church in Italy

Dynamic Identification of the So-Called Temple of Minerva Medica: Comparison of Different Instrumentations and Methods for Mutual Validation of the Results

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