In this work, we examine an application of Acoustic Emission (AE) technique for a probabilistic analysis in time and space of earthquakes, in order to preserve the valuable Italian Renaissance Architectural Complex named “The Sacred Mountain of Varallo”. Among the forty-five chapels of the Renaissance Complex, the structure of the Chapel XVII is of particular concern due to its uncertain structural condition and due to the level of stress caused by the regional seismicity. Therefore, lifetime assessment, taking into account the evolution of damage phenomena, is necessary to preserve the reliability and safety of this masterpiece of cultural heritage. A continuous AE monitoring was performed to assess the structural behavior of the Chapel. In the literature, a burst of AE activity is often considered as representative of a large amount of released stress, which is due to widespread micro-seismicity, and is crossing the crustal area surrounding the monitored site. Such AE activity is observed some time in advance compared to the earthquake, suggesting that AE records can be considered as earthquake precursors. During the monitoring period, a correlation between peaks of AE activity in the masonry of the “Sacred Mountain of Varallo” and regional seismicity was found. Although the two phenomena take place on very different scales, the AE in materials and the earthquakes in Earth’s crust, belong to the same class of invariance. In fact, the release of elastic energy from localized sources inside the medium due to the opening microcracks corresponds to the seismic energy release from the hypocenters of earthquakes. Finally, an accurate finite element model, performed with DIANA® finite element code, is presented to describe the dynamic behavior of Chapel XVII structure, confirming visual and instrumental inspections of regional seismic effects.

The Sacred Mountain of Varallo in Italy: Seismic risk assessment by Acoustic Emission and structural numerical models / Lacidogna, Giuseppe; Invernizzi, Stefano; Accornero, Federico; Carpinteri, Alberto. - Atti del XXI Convegno dell'Associazione Italiana di Meccanica Teorica ed Applicata:(2013), p. 144. (Intervento presentato al convegno XXI Convegno dell'Associazione Italiana di Meccanica Teorica ed Applicata tenutosi a Torino nel 17-20 Settembre 2013).

The Sacred Mountain of Varallo in Italy: Seismic risk assessment by Acoustic Emission and structural numerical models

LACIDOGNA, GIUSEPPE;INVERNIZZI, Stefano;ACCORNERO, FEDERICO;CARPINTERI, Alberto
2013

Abstract

In this work, we examine an application of Acoustic Emission (AE) technique for a probabilistic analysis in time and space of earthquakes, in order to preserve the valuable Italian Renaissance Architectural Complex named “The Sacred Mountain of Varallo”. Among the forty-five chapels of the Renaissance Complex, the structure of the Chapel XVII is of particular concern due to its uncertain structural condition and due to the level of stress caused by the regional seismicity. Therefore, lifetime assessment, taking into account the evolution of damage phenomena, is necessary to preserve the reliability and safety of this masterpiece of cultural heritage. A continuous AE monitoring was performed to assess the structural behavior of the Chapel. In the literature, a burst of AE activity is often considered as representative of a large amount of released stress, which is due to widespread micro-seismicity, and is crossing the crustal area surrounding the monitored site. Such AE activity is observed some time in advance compared to the earthquake, suggesting that AE records can be considered as earthquake precursors. During the monitoring period, a correlation between peaks of AE activity in the masonry of the “Sacred Mountain of Varallo” and regional seismicity was found. Although the two phenomena take place on very different scales, the AE in materials and the earthquakes in Earth’s crust, belong to the same class of invariance. In fact, the release of elastic energy from localized sources inside the medium due to the opening microcracks corresponds to the seismic energy release from the hypocenters of earthquakes. Finally, an accurate finite element model, performed with DIANA® finite element code, is presented to describe the dynamic behavior of Chapel XVII structure, confirming visual and instrumental inspections of regional seismic effects.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2518690
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