Influence of moisture content on the application of ND and MD tests to various species of timber elements

0546482 - ÚTAM 2022 RIV ES eng C - Konferenční příspěvek (zahraniční konf.)
Valluzzi, M. R. - Casarin, F. - Scancelli, L. - Drdácký, Miloš - Kloiber, Michal - Hrivnák, Jaroslav
Influence of moisture content on the application of ND and MD tests to various species of timber elements.
SAHC 2021. 12th International conference on structural analysis of historical constructions. Barcelona: International Centre for Numerical Methods in Engineering (CIMNE)2021, 2021 - (Roca, P.; Pelà, L.; Molins, C.), s. 639-650. ISBN 978-84-123222-0-0.
[International conference on structural analysis of historical constructions. SAHC 2021 /12./. Online event (ES), 29.09.2021-01.10.2021]
Institucionální podpora: RVO:68378297
Klíčová slova: timber species * moisture content * resistance drilling * ultrasonic tests * pin-pushing test * correlation
Obor OECD: Paper and wood
https://congress.cimne.com/SAHC2020/frontal/doc/Ebook_SAHC2020.pdf

Variations in environmental conditions can affect the structural performance of timber components and constructions. Especially in case of historic masonry buildings, where timber elements can be found either in roof or floor structures, intrinsic defects (e.g., knots, cracks, degradation), as well as the surrounding environmental conditions (e.g., temperature and moisture) can play an important role in the assessment of the mechanical response of the elements. In this connection, non-destructive (ND) and minor-destructive (MD) procedures are used to investigate the onsite conditions of wood, which are commonly based on either tool penetration resistance or wave transmission devices. In the paper, the influence of moisture content (MC) measured with various devices on a series of both old and new timber elements was compared. The elements made of various wood species (mainly red fir, but also white fir, pine and larch) were subjected to laboratory ND and MD testing by three research groups. Results showed the low influence of the MC on MD tests (i.e., resistance drilling and pin penetration) in comparison to the ND (i.e., sonic/ultrasonic) ones. Correlation relationships are provided, which illustrate and approximatively quantify the effect of MC for the experimentally investigated conditions and test equipment.
Trvalý link: http://hdl.handle.net/11104/0322985