Prediction of timber twisting based on measured spiral grain of spruce trunks and logs

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F23%3A00575777" target="_blank" >RIV/68378297:_____/23:00575777 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.52202/069179-0108" target="_blank" >https://doi.org/10.52202/069179-0108</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.52202/069179-0108" target="_blank" >10.52202/069179-0108</a>

Result language

angličtina

Original language name

Prediction of timber twisting based on measured spiral grain of spruce trunks and logs

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20102 - Construction engineering, Municipal and structural engineering

Project

<a href="/en/project/GA21-29389S" target="_blank" >GA21-29389S: Experimental and numerical assessment of the bearing capacity of notches in timber beams at arbitrary locations using LEFM</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

WCTE 2023. Proceedings from the 13th World conference on timber engineering

ISBN

9781713873273

ISSN

—

e-ISSN

—

Number of pages

7

Pages from-to

787-793

Publisher name

Curran Associates

Place of publication

Red Hook (NY)

Event location

Oslo

Event date

Jun 19, 2023

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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