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Experimental and numerical analysis of semi-destructive device for in situ assessment of wood properties in compression parallel to grain

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Abstract

A reconstruction of historical timber structures requires precise diagnostics of mechanical properties of particular structural members, which would subsequently underlie a reliable plan of the reconstruction. Mechanical properties of wood are determined most exactly using destructive techniques, but often they cannot be used in historical constructions. This calls for using nondestructive or semi-destructive techniques that are still reasonably exact, not too invasive and can be profitably used in situ. This work examines a new nondestructive diagnostic tool that enables to determine strength and stiffness parameters of wood parallel to the grain in situ. The function of the instrument was verified using standard compression tests parallel to the grain that correlated with the instrument well (r = 0.92). Complicated stress state in the drilled hole was examined by contact finite element analysis and revealed high contribution of longitudinal elastic moduli in force measurement (r = 0.96).

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Acknowledgements

This paper was created with financial support from Grant project DG16P02M026 “Historical Timber Structures: Typology, Diagnostics and Traditional Wood Working,” NAKI program II, provided by the Ministry of Culture and research supported by the project CZ 1.05/1.1.00/02.0060 from the European Regional Development Fund and the Czech Ministry for Education, Youth and Sports and Project No. LO1219 under the Ministry of Education, Youth and Sports National sustainability programme I.

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Correspondence to Michal Kloiber.

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Kloiber, M., Kunecký, J., Drdácký, M. et al. Experimental and numerical analysis of semi-destructive device for in situ assessment of wood properties in compression parallel to grain. Wood Sci Technol 51, 345–356 (2017). https://doi.org/10.1007/s00226-016-0881-6

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  • DOI: https://doi.org/10.1007/s00226-016-0881-6

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