Monitoring Deformations Of A Wooden Church Tower By Laser Scanning

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

77 Downloads (Pure)

Abstract

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.
Original languageEnglish
Title of host publication12th International Conference on Structural Analysis of Historical Constructions
Subtitle of host publicationSAHC 2021, Online event, 29 Sep - 1 Oct, 2021
EditorsP. Roca, L. Pelà , C. Molins
Place of PublicationSpain
PublisherInternational Centre for Numerical Methods in Engineering, CIMNE
Pages709-721
Number of pages13
ISBN (Print)978-84-123222-0-0
Publication statusPublished - 2021
Event12th International Conference on Structural Analysis of Historical Constructions - Online event
Duration: 29 Sept 20211 Oct 2021
Conference number: 12
https://congress.cimne.com/SAHC2020/frontal/default.asp

Conference

Conference12th International Conference on Structural Analysis of Historical Constructions
Abbreviated titleSAHC
Period29/09/211/10/21
Internet address

Keywords

  • Point Cloud
  • Deformation
  • Monitoring
  • Ransac
  • Segmentation
  • Heritage Structure
  • Wooden church tower

Fingerprint

Dive into the research topics of 'Monitoring Deformations Of A Wooden Church Tower By Laser Scanning'. Together they form a unique fingerprint.

Cite this