Use of Spectral Entropy for Damage Detection in Masonry Buildings in the Presence of Mild Seismicity

Ceravolo, Rosario; Lenticchia, Erica; Miraglia, Gaetano

doi:10.3390/icem18-05288

Cited by 7 publications

(12 citation statements)

References 10 publications

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“…As expected, the insertion of the damage caused a localized decrease of the Wiener entropy. This confirms the findings of previous studies [10,11,17].…”

Section: Effects Of Artificially Added Noisesupporting

confidence: 93%

Detection and Localization of Multiple Damages through Entropy in Information Theory

et al. 2021

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According to recent works, entropy measures, and more specifically, spectral entropies, are emerging as an efficient method for the damage assessment of both mechanical systems and civil structures. Specifically, the occurrence of structural system alterations (intended in this work as stiffness reduction) can be detected as a localized change in the signal entropy. Here, the Wiener Entropy (also known as the Spectral Flatness) of strain measurements is proved as a viable tool for single and multiple damage assessment, including damage detection, localization, and severity assessment. A case study from oil & gas engineering, i.e., a finite element model of a buried steel pipeline, is utilized for this aim.

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“…As expected, the insertion of the damage caused a localized decrease of the Wiener entropy. This confirms the findings of previous studies [10,11,17].…”

Section: Effects Of Artificially Added Noisesupporting

confidence: 93%

Detection and Localization of Multiple Damages through Entropy in Information Theory

et al. 2021

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“…Definitely, the latter can be defined as slight-to-moderate, corresponding to a Damage Grade 2 (DG2) according to the EMS-98. The dynamic response of the structure during the earthquake sequence as recorded by the seismic monitoring system, suggesting the occurrence of moderate structural damage according to previous studies (Ceravolo et al 2018;Spina et al 2019;Miraglia et al 2020), will be analysed in terms of post-seismic frequency reductions in Sect. 4.4.…”

Section: Damage State During the Central Italy Earthquake Sequence Of...mentioning

confidence: 99%

A methodological framework to relate the earthquake-induced frequency reduction to structural damage in masonry buildings

Sivori

Cattari

Lepidi

2022

Bull Earthquake Eng

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The diffusion of seismic structural health monitoring systems, evaluating the dynamic response of engineering structures to earthquakes, is growing significantly among strategic buildings. The increasing availability of valuable vibration data is being backed by continuously evolving techniques for analysing and assessing structural health and damage. Within this framework, the paper proposes a novel model-driven vibration-based methodology to support the assessment of the damage level in masonry buildings hit by earthquakes. The leading idea is to exploit, in the pre-event phase, synthetic equivalent-frame modelling and nonlinear dynamic analyses to systematically relate the gradual reduction of natural frequencies to increasing levels of structural damage. The resulting behavioural chart (seismic chart) of the building, constructed by employing computational tools and robustly defined on a statistical base, may provide the theoretical expectation to ascertain a certain level of seismic damage, based on the decrease in vibration frequency experimentally identified in the post-event phase. The methodology is firstly formalized, integrating common identification techniques with a novel damage grade estimation procedure, and finally exemplified for a monitored strategic masonry building damaged by the 2016–2017 Central Italy earthquake sequence. The outcomes of this application confirm the operational validity of the methodology, which can be intended as effective support for the decision-making process regarding structural usability and safety in the post-earthquake scenario.

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“…Two examples of the application of entropy-based SHM to real-scale buildings can be found in [10,11]. The results, however, depend on the specific definition of the entropy considered.…”

Section: Motivations For Entropy-based Shmmentioning

confidence: 99%

Instantaneous Spectral Entropy: An Application for the Online Monitoring of Multi-Storey Frame Structures

Civera

Surace

2022

Buildings

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Damage assessment techniques based on entropy measurements have been recently proposed for the structural health monitoring of civil structures and infrastructures. A quasi-real-time approach, based on the use of instantaneous spectral entropy (ISE) over an uninterrupted stream of data, is discussed here. The methodology is proposed for the detection of sudden damage-related structural changes (more specifically, linear stiffness reductions and nonlinear breathing cracks). The method operates by framing the continuous stream of vibration signals and comparing the single frames to a known baseline. The approach is also suitable for nonstationary signals originating from nonlinearly behaving structures. The procedure is validated on an experimental benchmark: a laboratory-scaled model of a three-storey single-span frame metallic structure. Three different definitions of entropy and six candidate time–frequency/time-scale transforms have been tested to find the optimal settings.

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Use of Spectral Entropy for Damage Detection in Masonry Buildings in the Presence of Mild Seismicity

Cited by 7 publications

References 10 publications

Detection and Localization of Multiple Damages through Entropy in Information Theory

Detection and Localization of Multiple Damages through Entropy in Information Theory

A methodological framework to relate the earthquake-induced frequency reduction to structural damage in masonry buildings

Instantaneous Spectral Entropy: An Application for the Online Monitoring of Multi-Storey Frame Structures

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