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This paper presents the use of laser scanner derived data for the study of the structural disorders in the central nave of the Parma\udCathedral. An accurate three-dimensional model of the entire nave was realized to investigate deformations, in order to reconstruct\udthe original conformation and the subsequent evolutions, also in comparison with previous surveys. Specifically, for the analysis\udpresented in the paper, seven scans were performed, one for each bay: the results allowed to compare the deformations on the seven\udvaults, on the transverse and diagonal arches, giving first hints on the possible differences in the behaviour between the different\udelements. The measures on the levels of floor and pillars bases were analysed in a historical monitoring approach, in order to retrace\udthe evolution of the differential settlements in time, since the construction of the building. Moreover, a structural analysis has been\udcarried out on one transverse arch with distinct element analysis, with two different approaches. In one case, the structure was\udinserted exactly as surveyed, and then subjected to the actions. In the second case, the original geometry, before the deformation, was\udretraced through a parametric approach and the structural analysis basically started at the beginning of the building’s life, thus trying\udto model not only the present structural situation, but also the path which led to the current deformation. The results were particularly\udmeaningful as they showed that in the first case, disregarding the footsteps of history, the stress pattern inside the masonry was very\uddifferent from the one obtained in the second case, which is more likely to represent the present conditions

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

LASER-SCANNER SURVEY OF STRUCTURAL DISORDERS: AN INSTRUMENT TO INSPECT THE HISTORY OF PARMA CATHEDRAL’S CENTRAL NAVE