Abstract
Abstract. The digitization and geometric knowledge of the historical built heritage is currently based on point cloud, that rarely or only partially is used as digital twin for structural analysis. The present work deals with historical artefacts survey, with particular reference to masonry structures, aimed to their structural analysis and assessment. In detail, the study proposes a methodology capable of employing semi-directly the original data obtained from the 3D digital survey for the generation of a Finite Element Model (FEM), used for structural analysis of masonry buildings.The methodology described presents a reliable workflow with twofold purpose: the improvement of the transformation process of the point cloud in solid and subsequently obtain a high-quality and detailed model for structural analyses.Through the application of the methodology to a case study, the method consistency was assessed, regarding the smoothness of the whole procedure and the dynamic characterization of the Finite Element Model. The main improvement in respect with similar or our previous workflows is obtained by the introduction of the retopology in data processing, allowing the transformation of the raw data into a solid model with optimal balancing between Level of Detail (LOD) and computational weight. Another significant aspect of the optimized process is undoubtedly the possibility of faithfully respecting the semantics of the structure, leading to the discretization of the model into different parts depending on the materials. This work may represent an excellent reference for the study of masonry artefacts belonging to the existing historical heritage, starting from surveys and with the purpose to structural and seismic evaluations, in the general framework of knowledge-based preservation of heritage.
Highlights
In the field of the 3D digitization of the historical built heritage, point cloud represents the reference object to obtain a digital twin of the existing constructions
The methodology consists in a complete workflow for structural analysis and seismic behaviour characterization applied in a whole building
The walls vary in thickness and consist of an external curtain almost entirely made of squared limestone blocks of Mount Conero and an internal predominantly brick curtain
Summary
In the field of the 3D digitization of the historical built heritage, point cloud represents the reference object to obtain a digital twin of the existing constructions. A highly investigated topic in current literature is the ScanToBIM, facing all problems of Heritage Building Information Modelling (HBIM) and the use of the point cloud for the management and documentation of the historical buildings, in which interesting research perspectives and solutions are observed. The most diffused technique consists in using the point cloud for the processing of traditional 2D drawings (plans, elevations and sections) on which 3D modeling is based within the tools integrated into the FEM environment This workflow presents two main weak points. The work starts from the analysis of some similar approaches already available in literature, it highlights their partial results, such as the fact that the majority is not structured in a broad logic, and proposes a methodology that allows to semiautomatically transforming the point cloud into a 3D FEM, dealing with a whole building
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