The safeguard of existing buildings is currently an issue of great interest in particular for existing heritage buildings. Masonry buildings are often characterized by a strong vulnerability. The vulnerability analyses at regional level could provide significant information. The objective is not to identify the behaviour of individual structures, but to define a typical behaviour for some homogeneous building classes. Therefore, to this aim, the analyses are usually conducted on entire urban areas, or on a multitude of buildings. Mechanical-capacitive analyses have been conducted including in-plane and out-of–plane behaviour of masonry structures to remark the impact of each of the behaviours on the global vulnerability assessment. Fragility curves remark that ordinary buildings are usually vulnerable to out-of-plane mechanisms, while heritage buildings usually incorporate seismic measures able to prevent out-of-plane mechanisms, hence improving the structural performance. In such cases the highest vulnerability is given by the in-plane behaviour. The comparative assessment of fragility including each of the two behaviours individually, and both together, shows that it is not possible a priori to select the most vulnerable behaviour, but they must be analysed together. The behaviour of a class of buildings is provided by the behaviour of the buildings included in that class, hence the designation of buildings to classes is a crucial aspect to be evaluated. Usual designation of building classes is made according to typological approach, while in present study, this approach is compared to an approach based on mechanical behaviour. Hence a class is defined by means of all the features that yield to a homogeneous seismic behaviour. Another outcome of this study, not less relevant in the improvement of knowledge of masonry assessment, is the outline of the most important sources of seismic vulnerability in masonry structures.
Seismic vulnerability assessments of existing masonry buildings at regional level: designation of building classes / Ramaglia, Giancarlo; Lignola, GIAN PIERO; Manfredi, Gaetano; Prota, Andrea. - (2016). (Intervento presentato al convegno La baia di Napoli: integrated strategies for conservation and use of cultural landscape tenutosi a Napoli nel 5-6 dicembre 2016).
Seismic vulnerability assessments of existing masonry buildings at regional level: designation of building classes
RAMAGLIA, GIANCARLO;LIGNOLA, GIAN PIERO;MANFREDI, GAETANO;PROTA, ANDREA
2016
Abstract
The safeguard of existing buildings is currently an issue of great interest in particular for existing heritage buildings. Masonry buildings are often characterized by a strong vulnerability. The vulnerability analyses at regional level could provide significant information. The objective is not to identify the behaviour of individual structures, but to define a typical behaviour for some homogeneous building classes. Therefore, to this aim, the analyses are usually conducted on entire urban areas, or on a multitude of buildings. Mechanical-capacitive analyses have been conducted including in-plane and out-of–plane behaviour of masonry structures to remark the impact of each of the behaviours on the global vulnerability assessment. Fragility curves remark that ordinary buildings are usually vulnerable to out-of-plane mechanisms, while heritage buildings usually incorporate seismic measures able to prevent out-of-plane mechanisms, hence improving the structural performance. In such cases the highest vulnerability is given by the in-plane behaviour. The comparative assessment of fragility including each of the two behaviours individually, and both together, shows that it is not possible a priori to select the most vulnerable behaviour, but they must be analysed together. The behaviour of a class of buildings is provided by the behaviour of the buildings included in that class, hence the designation of buildings to classes is a crucial aspect to be evaluated. Usual designation of building classes is made according to typological approach, while in present study, this approach is compared to an approach based on mechanical behaviour. Hence a class is defined by means of all the features that yield to a homogeneous seismic behaviour. Another outcome of this study, not less relevant in the improvement of knowledge of masonry assessment, is the outline of the most important sources of seismic vulnerability in masonry structures.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
