Surveying and Three-Dimensional Modeling for Preservation and Structural Analysis of Cultural Heritage

Selvaggi, Ilenia (2017) Surveying and Three-Dimensional Modeling for Preservation and Structural Analysis of Cultural Heritage, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Ingegneria civile, chimica, ambientale e dei materiali, 29 Ciclo. DOI 10.6092/unibo/amsdottorato/8182.
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Dense point clouds can be used for three important steps in structural analysis, in the field of cultural heritage, regardless of which instrument it was used for acquisition data. Firstly, they allow deriving the geometric part of a finite element (FE) model automatically or semi-automatically. User input is mainly required to complement invisible parts and boundaries of the structure, and to assign meaningful approximate physical parameters. Secondly, FE model obtained from point clouds can be used to estimate better and more precise parameters of the structural analysis, i.e., to train the FE model. Finally, the definition of a correct Level of Detail about the three-dimensional model, deriving from the initial point cloud, can be used to define the limit beyond which the structural analysis is compromised, or anyway less precise. In this work of research, this will be demonstrated using three different case studies of buildings, consisting mainly of masonry, measured through terrestrial laser scanning and photogrammetric acquisitions. This approach is not a typical study for geomatics analysis, but its challenges allow studying benefits and limitations. The results and the proposed approaches could represent a step towards a multidisciplinary approach where Geomatics can play a critical role in the monitoring and civil engineering field. Furthermore, through a geometrical reconstruction, different analyses and comparisons are possible, in order to evaluate how the numerical model is accurate. In fact, the discrepancies between the different results allow to evaluate how, from a geometric and simplified modeling, important details can be lost. This causes, for example, modifications in terms of mass and volume of the structure.

Tipologia del documento
Tesi di dottorato
Selvaggi, Ilenia
Dottorato di ricerca
Settore disciplinare
Settore concorsuale
Parole chiave
Terrestrial Laser Scanning; Close Range Photogrammetry; historical buildings; cultural heritage; geometric modeling; numerical modeling; comparison data; finite element analysis; structural analysis;
Data di discussione
17 Maggio 2017

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