ROOFING STRUCTURES IN ARCHAEOLOGICAL SITES: POMPEII INSULA OF THE CENTENARY [IX, 8]

Roofing structures in archaeological sites are continuously subject of studies. In Pompeii there are many examples of roofing structures, built using several techniques and guidelines. Recently, within the agreement signed between the DICAM department of the University of Bologna and the Superintendence of Pompeii about the analysis of the structures and the study of the operations of consolidation and restoration of the Insula of the Centenary, the issue of designing roofing structures of various spaces of the Insula was addressed. In particular the attention was focused on the covering of the main atrium. Firstly a prototype of a roofing structure covering a portion of the atrium was installed. Then, precisely fitted inside the ruins by means of a laser scanner survey, the structural design of three different types of roofing structures was defined: • wood structure with roof tiles; • aluminum structure and polycarbonate panels; • steel structure and corrugated steel panels. Various three-dimensional models were developed on the real geometry provided by the laser survey and analyzed with engineering software tools to track the effect of static and seismic actions on the whole structure. Among all the other possible ones, the solution involving the use of a restoration roof covering in lightweight material, resting on the existing masonry after consolidating the latter and creating stringcourses at various heights on the wall ridges provides a result which is less invasive visually and, at the same time, leads to an improvement in the seismic behaviour of the whole.