Monitoring Deformations Of A Wooden Church Tower By Laser Scanning

Monitoring Deformations Of A Wooden Church Tower By Laser Scanning

Truong-Hong, Linh (TU Delft Optical and Laser Remote Sensing)
Lindenbergh, R.C. (TU Delft Optical and Laser Remote Sensing)
Woudenberg, Pieter (Student TU Delft)
Gard, W.F. (TU Delft Bio-based Structures & Materials)
van de Kuilen, J.W.G. (TU Delft Bio-based Structures & Materials; Technische Universität München)

Roca, P. (editor)
Pelà, L. (editor)
Molins, C. (editor)

2021

Churches are part of heritage structures that take an important role in Europe ́s cultural identity. As such, these structures must be protected to prevent catastrophic collapse and any damage must be reported timely to establish planning to maintenance and restoration. This can be achievable when the churches are monitored periodically with regular intervals. However, this monitoring strategy has not been available in most of the Europe’s churches for a number of reasons, complexity of the structures and limited budget are just two of them. Laser scanning has been widely used in capturing rich three-dimensional (3D) topographic data of visible surfaces of a structure with high accuracy. This paper presents a methodology to determine the shape and possible deviation from verticality of the church’s tower for monitoring deformation using a terrestrial laser scanner. The 500-year old wooden tower of St. Bavo Church in Haarlem, Netherlands is selected as a case study. First, point clouds of the tower captured from different views are registered into the same coordinate system. Second, a RANSAC method is employed to extract point clouds of a whole façades of the tower. Next, a point and surface-based method is proposed to compute the deformation of the surface from its data points. The results indicate that there is slightly different deformation between the tower facades in the same story and in neighbour stories. Moreover, the maximum total relative deformation at Story 7 of the tower by 0.63m.

Point Cloud
Deformation
Monitoring
Ransac
Segmentation
Heritage Structure
Wooden church tower

http://resolver.tudelft.nl/uuid:e134f915-f9f2-4e2a-9bd5-ad4f879b108c

International Centre for Numerical Methods in Engineering, CIMNE, Spain

978-84-123222-0-0

12th International Conference on Structural Analysis of Historical Constructions: SAHC 2021, Online event, 29 Sep - 1 Oct, 2021

12th International Conference on Structural Analysis of Historical Constructions, 2021-09-29 → 2021-10-01, Online event

Institutional Repository

conference paper

© 2021 Linh Truong-Hong, R.C. Lindenbergh, Pieter Woudenberg, W.F. Gard, J.W.G. van de Kuilen