Modelling from the past: the leaning southwest tower of Caerphilly castle 1539 – 2017

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  2. Dr Vasilis Sarhosis
Author(s)Prizeman OEC, Sarhosis V, D'alri AM, Whitman CJ, Muratore G
Editor(s)J. Hayes, C. Ouimet, M. Santana Quintero, S. Fai, and L. Smith
Publication type Conference Proceedings (inc. Abstract)
Conference Name26th International CIPA Symposium – Digital Workflows for Heritage Conservation
Conference LocationOttawa, Canada
Year of Conference2017
Source Publication Date
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Caerphilly Castle (1268-70) is the first concentric castle in Britain and the second largest in the UK. The dramatic inclination of its ruinous south west tower has been noted since 1539. Comparing data from historical surveys and a terrestrial laser scan undertaken in 2015, this paper seeks to review evidence for the long-term stability of the tower. Digital documentation and archival research by architects is collated to provide data for structural analysis by engineers. A terrestrial laser scan was used to create a detailed three dimensional finite element model to enable structural analysis of the current shape of the tower made by tetrahedral elements. An automated strategy has been implemented for the transformation of the complex three dimensional point cloud into a three dimensional finite element model. Numerical analysis has been carried out aiming at understanding the main structural weaknesses of the tower in its present condition. Comparisons of four sets of data: 1539, 1830, 1870 and 2015 enabled us to determine change albeit between very different methods of measurement.
PublisherICOMOS/ISPRS International Scientific Committee on Heritage Documentation (CIPA)
NotesISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-2/W2, 221-227, 2017