Number of the records: 1
Prediction of timber twisting based on measured spiral grain of spruce trunks and logs
- 1.
SYSNO ASEP 0575777 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Prediction of timber twisting based on measured spiral grain of spruce trunks and logs Author(s) Kloiber, Michal (UTAM-F) RID, ORCID, SAI
Kunecký, Jiří (UTAM-F) RID, SAI, ORCID
Kotmel, M. (CZ)Number of authors 3 Source Title WCTE 2023. Proceedings from the 13th World conference on timber engineering. - Red Hook (NY) : Curran Associates, 2023 / Nyrud A. Q. ; Malo K. A. ; Nore K. - ISBN 9781713873273 Pages s. 787-793 Number of pages 7 s. Publication form Print - P Action World conference on timber engineering. WCTE /13./ Event date 19.06.2023 - 22.06.2023 VEvent location Oslo Country NO - Norway Event type WRD Language eng - English Country US - United States Keywords timber ; spiral grain ; twist ; structural repair OECD category Construction engineering, Municipal and structural engineering R&D Projects GA21-29389S GA ČR - Czech Science Foundation (CSF) Institutional support UTAM-F - RVO:68378297 EID SCOPUS 85171620661 DOI https://doi.org/10.52202/069179-0108 Annotation This work focuses on the prediction of timber (beam) twisting based on the measurement of spiral grain under the bark of spruce trees (using Fakopp) and the subsequent measurement of spiral grain of logs during manipulation using a slope of grain detector. When selecting wood, it is necesary to take account of the effect of spiral grain on sawings - based on international practice - a spiral grain up to 5% deviation per 1 m of log length is not considered a defect. However, it is important whether the spiral is left-handed or right-handed, as measured on the log perimeter. Left-handed spiral increases after log processing while right-handed spiral decreaces. The perimeter of an element from a left-handed log that was within the acceptable 5% angle deviation per 1 m of length manifests a considerably higher deviation when machined, when markedly affects the timber twist during drying. By contrast, beams from right-handed logs with up to 5% deviation per 1 m of length have perimeter without spiral grain, and they are not defected by twist during drying. This phenomenon has been confirmed by the study conducted. Further, a good prediction of spiral grain in trees has been achieved using non-invasive equipment, Fakopp ArborSonic Microsecond Timer. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2024 Electronic address https://doi.org/10.52202/069179-0108
Number of the records: 1