PSI - Issue 64

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Yago Cruz et al. / Procedia Structural Integrity 64 (2024) 335–342 Yago Cruz / Structural Integrity Procedia 00 (2019) 000 – 000

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and does not contain ornamental elements so as not to interfere in the subsequent calculation process. This model is linked to a finite element meshing and structural analysis program, where the static and dynamic loads that affect the construction are calculated and analyzed. Structural health assessment This section compares the evolution of the structural health of each element and of the entire structure based on the data recorded over time and the associated structural analysis. For this purpose, the different types of data obtained are analyzed together with the necessary calculations to know if the building meets the regulations or if it is necessary to carry out reforms in the structure. 3. Case of study The proposed methodology is applied in the Casa da Câmara de Guimarães, Portugal. The construction began in the 14th century and lasted until the middle of the 15th century. Between the sixteenth and eighteenth centuries, several reconstructions and renovations were carried out in the building. A previous study of this same building was carried out in (Santos et al., 2022) on the wooden structure of its roof. 2.4

Fig. 2. (a) Location map of the Casa da Câmara de Guimarães; (b) and (c) Images of the facades of the Casa da Câmara de Guimarães.

3.1. Data collection An experimental campaign was carried out in order to obtain the necessary data to create the 3D geometric model and carry out the necessary studies. An exhaustive photographic report of the exterior facades and interior rooms was carried out in order to get as close as possible to the geometry and real details of the building when modeling. To obtain the point cloud of the structure (Fig. 3a) a FARO laser scanner, model Focus 3D x130, was used. This is based on the phase difference methodology to obtain the data, it allows obtaining objects in a range of 0.6 m to 120 m with an error of ± 2 mm and scans 976000 points per second. Thirty-two scans were made, divided into: 5 in each of the two facades, 5 in the galleries, 6 in each of the two halls, 2 in the staircase areas, and 3 in the chamber. The reason for performing several scans in each area is to achieve different scanning angles to obtain less interference and avoid empty areas in the processing of the point clouds. The next step is to analyze the structure with a thermal camera. Samples were taken from the facades of the building to study the possible existing humidities, in these areas little relevant humidities were found (Fig. 3b). Furthermore, the camera was used in the lower part of the floor slab to locate the interior joists of the building. The joists, being inside the walls or ceilings, affect heat distribution and generate temperature variations detectable from the outside. When scanning with a thermal camera, these temperature differences can be visualized on the screen, allowing the location of the joists or other internal elements within the structures to be identified. In Fig. 3c, four joists are pointed