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Monitoring archaeological wooden structures: Non-contact measurement systems and interpretation as average strain fields
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2016 (English)In: Journal of Cultural Heritage, ISSN 1296-2074, E-ISSN 1778-3674, Vol. 17, 102-113 p.Article in journal, Editorial material (Refereed) Published
Abstract [en]

Abstract Large wooden structures of cultural value, such as the Vasa ship, suffer from increasing deformation over time, caused by creep in the wood members, time-dependent deformation of joints and damage accumulation. In this paper, we discuss the suitability of the different available measurement techniques to monitor the increasing deformation and the structural health of wooden structures. In particular, a monitoring system needs to be able to measure the exact same point at different times to measure displacements. For large wooden objects with limited surface texture, the best accuracy for displacement measurements is currently achieved by monitoring well-defined targets with laser-assisted total stations. Furthermore, we emphasize the relation between displacements and deformation and advocate translating the raw displacement data into more meaningful average strain fields. A straightforward method to compute the in-plane average strain field is presented, and illustrated for the Vasa ship. The strain fields can indicate areas with localized strain, caused e.g. by weak zones in the structure with increased creep, damage or cracking. Such zones can then be more closely inspected and considered for improved support.

Place, publisher, year, edition, pages
2016. Vol. 17, 102-113 p.
Keyword [en]
Archaeological wooden structures, Geodetic measurements, Structural monitoring, Strain
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-264241DOI: 10.1016/j.culher.2015.03.011ISI: 000372484300012OAI: oai:DiVA.org:uu-264241DiVA: diva2:859596
Funder
Swedish Research Council FormasVINNOVASwedish Research Council
Available from: 2015-10-07 Created: 2015-10-07 Last updated: 2017-12-01Bibliographically approved

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van Dijk, Nico PGamstedt, E KristoferBjurhager, Ingela

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