A COMPARATIVE STUDY BETWEEN WMMS AND TLS FOR THE STABILITY ANALYSIS OF THE SAN PEDRO CHURCH BARREL VAULT BY MEANS OF THE FINITE ELEMENT METHOD
- 1Department of Cartographic and Land Engineering. University of Salamanca, Higher Polytechnic School of Ávila, Hornos Caleros, Ávila, Spain
- 2University of Vigo, School of Industrial Engineering, Department of Engineering Materials, Applied Mechanics and Construction, Vigo, Spa
- 3Fundación Santa María la Real del Patrimonio Histórico, Aguilar de Campoo, Palencia, Spain
Keywords: Wearable Mobile Mapping System, Terrestrial Laser Scanner, Masonry, Historical Constructions, Finite Element Method, Structural Analysis
Abstract. Stability of masonry constructions is highly conditioned by the geometric disposition of its elements due to its low tensile strength and great compressive mechanical properties. Under this framework, this paper attempts to evaluate the suitability of a wearable mobile mapping solution, equipped in a backpack and based on the well-known simultaneous location and mapping paradigm, for the structural diagnosis of historical constructions. To evaluate the suitability of this device, the structural analysis obtained is compared with a high precision terrestrial laser scanner, which is considered as ground truth. The Romanesque church of San Pedro (Becerril del Carpio, Spain) was selected as a study case. This construction, initially conceived in the XIIIth century, has experimented in the past a soil settlement promoting the leaning of the north wall, several plastic hinges in its barrel vault and a visible geometrical deformation. The comparison of both techniques was carried out at different levels: i) an evaluation of the time needed to obtain the point cloud of the church; ii) an accuracy assessment based on the comparison of a terrestrial network using artificial spheres as checkpoints and; iii) an evaluation of the discrepancies, in terms of safety factor and collapse topology, found during the advance numerical evaluation of the barrel vault by means of the finite element method. This comparison places this wearable mobile mapping solution as an interesting tool for the creation of advanced numerical simulations to evaluate the structural stability of historical constructions.