The extension of damage on churches observed after strong earthquakes evidences the necessity to plan, at regional scale, effective restoration, consolidation and preventive protection strategies. In this framing, the availability of suitable speedy methodologies for the assessment of the main structural fragilities and therefore of the seismic vulnerability of each church is the first fundamental step to be undertaken. This paper presents a methodology for the seismic vulnerability assessment of churches based on a damage reconnaissance activity carried out after the 2009 L’Aquila earthquake on a population of 64 churches. Firstly, the post-earthquake evaluation of damage is described with the aim of identifying both the recurrent damage mechanisms and the main local structural fragilities. As an important outcome, it has been observed that the occurred damage scenario, shown in terms of frequency of pre-established damage levels, can be represented by a binomial distribution, which depends on one parameter only, namely mean damage level. Then, a literature predictive model able to give back the above parameter for several earthquake intensities is applied for outlining fragility curves related to the seismic risk of churches. These curves represent a powerful tool for the prediction of likely future damage scenarios. Finally, some ongoing applications of the proposed analysis methodology to churches of different territorial areas are described.
Seismic vulnerability assessment of churches at regional scale after the 2009 L'Aquila earthquake
De Matteis, G.
;Guadagnuolo, M.
2017
Abstract
The extension of damage on churches observed after strong earthquakes evidences the necessity to plan, at regional scale, effective restoration, consolidation and preventive protection strategies. In this framing, the availability of suitable speedy methodologies for the assessment of the main structural fragilities and therefore of the seismic vulnerability of each church is the first fundamental step to be undertaken. This paper presents a methodology for the seismic vulnerability assessment of churches based on a damage reconnaissance activity carried out after the 2009 L’Aquila earthquake on a population of 64 churches. Firstly, the post-earthquake evaluation of damage is described with the aim of identifying both the recurrent damage mechanisms and the main local structural fragilities. As an important outcome, it has been observed that the occurred damage scenario, shown in terms of frequency of pre-established damage levels, can be represented by a binomial distribution, which depends on one parameter only, namely mean damage level. Then, a literature predictive model able to give back the above parameter for several earthquake intensities is applied for outlining fragility curves related to the seismic risk of churches. These curves represent a powerful tool for the prediction of likely future damage scenarios. Finally, some ongoing applications of the proposed analysis methodology to churches of different territorial areas are described.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
