The paper illustrates the damages occurred to masonry buildings due to incorrect consolidation inter-ventions dated back to the 1980s that, according to the culture of the time, were oriented to the re-placement of structural elements with new heavy ones, thus changing the static scheme. The case study concerns the seventeenth century church of S.M. of Itria in Piazza Armerina, affected in 2007 by the collapse of the one side wall of the apse. After illustrating the historical evolution and the actual state of the building, the investigations carried out to identify the causes of collapse and provide for appropriate reconstruction interventions are re-ported. The results of these studies based on hydro-geological and geotechnical surveys lead to ex-clude foundations subsidence from the causes of the collapse. The study is focused on the analysis of the interventions carried out between 1980 and 1985 for the replacement of the existing wooden cov-ering with girder and hollow block floors, connected with r.c. curb. The structural analysis was carried out under two load conditions before the collapse with the existing r.c. roof and with the previous wooden one. Even though a proper static and restoration intervention would require the reconstruction of the wooden roof, the demolition of the current one was excluded, as it would compromise the con-solidated static balance. The planned intervention concerned the reconstruction of the wall with col-lapse recovery stones and blocks of similar physical-mechanical properties, the improvement of the walls resistance with mortar injections, the construction of curbs on the top of the walls, the stretching of transversal tie-rods and the introduction of new ones.
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