Generally, strong seismic events cause serious damage to cultural heritage, especially churches that are characterized by a high vulnerability due to the intrinsic peculiarities of their structural systems that are not able to develop an efficient resisting mechanism. Starting from experimental data on damage and ground motion intensity, collected after a seismic event it is possible to define an empirical response models. In this paper, an empirical model for the seismic damage of churches is proposed. In particular, the damage is measured by a continuous index and the seismic action is described by the Peak Ground Acceleration. The overall probabilistic response model bases on three specific functions that identify the probability of undamaged and collapsed churches and the density distribution of damage churches, for different intensity levels. The parameters that define the proposed model are evaluated considering a sample of churches falling into a limited area hit by the Central Italy 2016 seismic sequence that has caused important damage to the cultural heritage. The considered sample of churches is quite large, covers a wide range of damage and intensity levels and includes all the churches of the region (completeness). The parameters of the model are evaluated using the maximum likelihood estimation. The main results deriving from the proposed procedure and model are described, and the fragility curves deduced from the model are presented.

EMPIRICAL MODEL FOR THE SEISMIC DAMAGE OF CHURCHES

Claudia Canuti;Michele Morici;Andrea Dall’Asta;Graziano Leoni
2020-01-01

Abstract

Generally, strong seismic events cause serious damage to cultural heritage, especially churches that are characterized by a high vulnerability due to the intrinsic peculiarities of their structural systems that are not able to develop an efficient resisting mechanism. Starting from experimental data on damage and ground motion intensity, collected after a seismic event it is possible to define an empirical response models. In this paper, an empirical model for the seismic damage of churches is proposed. In particular, the damage is measured by a continuous index and the seismic action is described by the Peak Ground Acceleration. The overall probabilistic response model bases on three specific functions that identify the probability of undamaged and collapsed churches and the density distribution of damage churches, for different intensity levels. The parameters that define the proposed model are evaluated considering a sample of churches falling into a limited area hit by the Central Italy 2016 seismic sequence that has caused important damage to the cultural heritage. The considered sample of churches is quite large, covers a wide range of damage and intensity levels and includes all the churches of the region (completeness). The parameters of the model are evaluated using the maximum likelihood estimation. The main results deriving from the proposed procedure and model are described, and the fragility curves deduced from the model are presented.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/442062
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