The paper is aimed at assessing the seismic response analysis of the picturesque medieval village of Sant’Agata de’ Goti located in Southern Italy, taking into account its complex morphology, including underground cavities. The subsoil is constituted by alternating layers of yellow and grey tuff overlaid with a shallow cover of pyroclastic soil and made ground. The stiffer and shallower yellow tuff layer is crossed by a system of 160 cavities resulting from the quarrying activity for constructing the historical buildings. Due to the elongated shape and the rather uniform subsoil conditions of the hill, plane strain static and dynamic analyses were performed with the finite difference code FLAC 2D, taking into account the presence of the cavities. The soil and rock layers were assumed as hysteretic materials following the Mohr-Coulomb failure criterion, with the relevant mechanical parameters calibrated on past and recent investigations performed both in laboratory and in situ. The results of the seismic response analyses were interpreted in terms of spatial variability of the amplification factor of the spectral intensity referred to appropriate period ranges, to highlight the most hazardous zones of the hill in terms of seismic actions transmitted to the buildings. The comparison between the results obtained with or without the cavities permitted to highlight their influence on the prediction of the on-site seismic hazard.

Effects of the underground urban development on the seismic response of a historical centre in Italy

Piro A.;de Silva F.;Meccariello M.;Parisi F.;Silvestri F.;
2019

Abstract

The paper is aimed at assessing the seismic response analysis of the picturesque medieval village of Sant’Agata de’ Goti located in Southern Italy, taking into account its complex morphology, including underground cavities. The subsoil is constituted by alternating layers of yellow and grey tuff overlaid with a shallow cover of pyroclastic soil and made ground. The stiffer and shallower yellow tuff layer is crossed by a system of 160 cavities resulting from the quarrying activity for constructing the historical buildings. Due to the elongated shape and the rather uniform subsoil conditions of the hill, plane strain static and dynamic analyses were performed with the finite difference code FLAC 2D, taking into account the presence of the cavities. The soil and rock layers were assumed as hysteretic materials following the Mohr-Coulomb failure criterion, with the relevant mechanical parameters calibrated on past and recent investigations performed both in laboratory and in situ. The results of the seismic response analyses were interpreted in terms of spatial variability of the amplification factor of the spectral intensity referred to appropriate period ranges, to highlight the most hazardous zones of the hill in terms of seismic actions transmitted to the buildings. The comparison between the results obtained with or without the cavities permitted to highlight their influence on the prediction of the on-site seismic hazard.
978-0-367-14328-2
978-0-429-03127-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/755776
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