The combination of geomatic approaches and operational modal analysis to improve calibration of finite element models: A case of study in Saint Torcato Church (Guimarães, Portugal)

Abstract

This paper present a set of procedures based on laser scanning, photogrammetry (Structure from Motion) and operational modal analysis in order to obtain accurate numeric models which allows identigying architectural complications that arise in historical buildings. In addition, the method includes tools that facilitate building-damage monitoring tasks. All of these aimed to obtain robust basis for numerical analysis of the actual behavior and monitoring task. This case study seeks to validate said methodologies, using as an example the case of Saint Torcato Church, located in Guimãres, Portugal.

Photogrammetric, Geometrical, and Numerical Strategies to Evaluate Initial and Current Conditions in Historical Constructions: A Test Case in the Church of San Lorenzo (Zamora, Spain)

“…Its flexibility-as it can be integrated into different types of platforms (e.g., UAV [9])-low-cost, and qualities of the point cloud (high density, photorealistic texture, and accuracy) place the solution at a vantage position in the evaluation of historical buildings [23].…”

“…The great diversity of approaches today, along with their flexibility, place image-based procedures as a suitable solution for the analysis of constructions [3,9,12], materials [13,14], and pathologies [8].…”

“…), or even generating true-ortho-images, increase further the applicability of the obtained product. More precisely, they help to accurately build CAD models suitable for subsequent numerical simulations, as well as complementary products, which analyze patterns of deformation and cracking for the pathological characterization of the structure [9] (Figure 4b). …”

“…In a first stage the boundary vertex (limits of the construction, lack of material and the absence of an oculus piece) of the mesh are extracted. Later, in a second stage, the cracks are integrated into these boundary contours, through a projection of the observed crack path on the SfM point cloud, as established [9].…”

“…It is in the field of built constructions where remote sensors and especially photogrammetric and laser scanner systems have proven great worth for their analysis [3,[8][9][10]. These sensors are able to provide accurate and dense geometric and radiometric values with which to assess these buildings, as well as obtaining the data through non-intrusive means.…”