Issue 46

A. Maione et alii, Frattura ed Integrità Strutturale, 46 (2018) 240-251; DOI: 10.3221/IGF-ESIS.46.22 243 the room 52 (hosting the precious "Salottino di porcellana") it was possible to discover that under the original masonry vault, still in place, there was a timber structure consisting in a series of ribs completed with a mat of plaited canes and bricks on a sheet. The height at the keystone of this latter vault is lower than that of the original one. (a) (b) (c) Figure 2 : (a) Planimetric identification of the three couples of adjacent rooms (9 and 49, 10 and 48, 11 and 47); views of the intrados of the painted vaults related to (b) room 9 and (c) room 10. Hence, it was supposed that a similar solution had been adopted for the rooms under study. In this case, the problem was also to understand whether the original vaulted structure was still in place or was replaced by a concrete slab. Lastly, a third hypothesis assumes that the present visible vaults are structural masonry vaults but their fourth side, corresponding to the thin wall, is carried out by a concrete curb. In order to verify the formulated hypotheses a diagnostic strategy was defined with the objective of finding a compromise between the need of preserving the historical value and the public function of the building on one side, and the need of modelling the structural behaviour on the basis of a satisfactory knowledge of the constructive details, on the other side. The non-destructive technique of the infrared thermography was chosen to this aim. The diagnostic campaign was performed by the Stress-scarl district, Consorzio Tre and the Testing Laboratory collaborating with the Dist Department of the University of Naples (Italy).