Studio preliminare sul complesso fortificato di Trogir (Croazia) basato su un approccio multi-disciplinare

The city center of Trogir represents an important example of Romanesque, early Renaissance and Baroque architecture and is part of the UNESCO World Heritage list. In this paper, the authors propose a multidisciplinary approach for the reconstruction of the stratigraphic succession of the interventions and documentation at the masonry level of the Kamerlengo castle by combining digital, photographic and thermographic data. The Kamerlengo castle was built in the 15th century and, together with the Saint Mark chapel, represents the only part of the ancient fortification complex that is still present in the city. Today it has many conservation problems due mainly to the decay of the original parts and the prolonged absence of maintenance works. The first step in the conservation process is the diagnosis of the structural integrity of the fort. At this first stage, recognition using non-destructive techniques based on imaging systems such as a combination of IR thermography, photogrammetric surveys and visual inspection is preferable. Through IR thermography analysis it is possible to verify the presence of inhomogeneities in the masonry (air cavities, water infiltration, different materials, etc.), contributing to the reading of the construction phases of the castle. The study of the structural integrity was completed by the 3D laser scanner survey and the SfM photogrammetric survey, which also enables the morphometry and environmental aspects of the fort to be documented. The output produced at the end of this activity represents an important support for the definition of the diagnostic campaign and for the promotion of the site.