Italy is characterized by high seismicity and the recent earthquakes have highlighted the high vulnerability of the Italian real estate, mainly composed of historical and old masonry buildings. The greatest damages mostly occurred in the historical centres, where masonry buildings in aggregate are the prevalent structural typology. This circumstance has renewed the need of procedures for the seismic risk assessment and the unitary planning of strengthening interventions, according to a specific methodology appropriate for the masonry aggregates, in order to achieve safety standards and reduce the losses. Indeed, in the seismic vulnerability assessment, the identification of a determined building (i.e., structural unit) as an independent structure can become difficult, since it is often in adjacency to others and the same boundary walls are shared. Consequently, it is known that these systems do not have an independent structural behaviour, given the reciprocal interactions with adjacent structures during a seismic event (namely, the “aggregate effect”), and their analysis is naturally affected by several sources of uncertainties. Hence, this research project aims at understanding how the “aggregate effect” should be modelled for a more accurate assessment of the global seismic performance of the masonry buildings in aggregate, reducing the uncertainties related to too extensive knowledge process and providing tools for the definition of new guidelines for the masonry aggregates. To this end, a new procedure, referred to as “target structural unit approach”, is proposed, aiming at identifying the optimal portion of the aggregate that best represents the “aggregate effect” for the investigated building, i.e. the Minimum Unit of Analysis (M.U.A.).

Identification of Minimum Unit of Analysis for seismic performance assessment of masonry buildings in aggregate / Chiara Bernardini. - (2019).

Identification of Minimum Unit of Analysis for seismic performance assessment of masonry buildings in aggregate

BERNARDINI, CHIARA
2019

Abstract

Italy is characterized by high seismicity and the recent earthquakes have highlighted the high vulnerability of the Italian real estate, mainly composed of historical and old masonry buildings. The greatest damages mostly occurred in the historical centres, where masonry buildings in aggregate are the prevalent structural typology. This circumstance has renewed the need of procedures for the seismic risk assessment and the unitary planning of strengthening interventions, according to a specific methodology appropriate for the masonry aggregates, in order to achieve safety standards and reduce the losses. Indeed, in the seismic vulnerability assessment, the identification of a determined building (i.e., structural unit) as an independent structure can become difficult, since it is often in adjacency to others and the same boundary walls are shared. Consequently, it is known that these systems do not have an independent structural behaviour, given the reciprocal interactions with adjacent structures during a seismic event (namely, the “aggregate effect”), and their analysis is naturally affected by several sources of uncertainties. Hence, this research project aims at understanding how the “aggregate effect” should be modelled for a more accurate assessment of the global seismic performance of the masonry buildings in aggregate, reducing the uncertainties related to too extensive knowledge process and providing tools for the definition of new guidelines for the masonry aggregates. To this end, a new procedure, referred to as “target structural unit approach”, is proposed, aiming at identifying the optimal portion of the aggregate that best represents the “aggregate effect” for the investigated building, i.e. the Minimum Unit of Analysis (M.U.A.).
2019
Andrea Vignoli, Martin Empelmann
ITALIA
Chiara Bernardini
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1170554
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