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Structural timber assessment and prediction of wood properties by means of acoustic and semi-destructive methods

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F19%3A43916502" target="_blank" >RIV/62156489:43410/19:43916502 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/68378297:_____/19:00509069

  • Výsledek na webu

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Structural timber assessment and prediction of wood properties by means of acoustic and semi-destructive methods

  • Popis výsledku v původním jazyce

    Wood properties play an important role in truss mechanics and durability and therefore a selection of high-quality material is one of the basic steps in traditional carpentry technique of restoration of valuable historical constructions. From this perspective, simple and reliable methods for assessment of standing trees, logs and timber are searched. Do we have a reliable tool for prediction of timber quality in-situ? Are the harvesting period and timber storage significant factors influencing in quality of structural wood? Forest stands in Bohemian-Moravian Highlands with optimal ecological conditions for Norway spruce was selected. 28 standing trees were sorted and assessed by visual methods and device supported methods. Consequently 17 trees were felled, sampled, milled to logs and again tested by various devices. All logs were processed to make 68 beams (20x24x240 cm) by traditional carpentry way or machine milling. Traditional ways of wood treatment in water were tested too. The 68 beams were tested by frequency-resonant method in the course of almost 2 years. 24 trees were also felled during 3 different seasons. These trees were felled 7 days before full moon or 7 days after full moon. The 47 beams made by the traditional carpentry process came from these trees. Wood densities, annual widths, sound velocities, dynamic modulus of elasticity, micro-drilling and indentation resistances were measured, and visual assessment was carried out. The differences and relationships between properties were statistically tested to determine significance of manufacturing parameters and reliability of used methods to predict properties at several levels of wood processing, and also to describe the influence of harvest period or timber treatment to quality and properties.

  • Název v anglickém jazyce

    Structural timber assessment and prediction of wood properties by means of acoustic and semi-destructive methods

  • Popis výsledku anglicky

    Wood properties play an important role in truss mechanics and durability and therefore a selection of high-quality material is one of the basic steps in traditional carpentry technique of restoration of valuable historical constructions. From this perspective, simple and reliable methods for assessment of standing trees, logs and timber are searched. Do we have a reliable tool for prediction of timber quality in-situ? Are the harvesting period and timber storage significant factors influencing in quality of structural wood? Forest stands in Bohemian-Moravian Highlands with optimal ecological conditions for Norway spruce was selected. 28 standing trees were sorted and assessed by visual methods and device supported methods. Consequently 17 trees were felled, sampled, milled to logs and again tested by various devices. All logs were processed to make 68 beams (20x24x240 cm) by traditional carpentry way or machine milling. Traditional ways of wood treatment in water were tested too. The 68 beams were tested by frequency-resonant method in the course of almost 2 years. 24 trees were also felled during 3 different seasons. These trees were felled 7 days before full moon or 7 days after full moon. The 47 beams made by the traditional carpentry process came from these trees. Wood densities, annual widths, sound velocities, dynamic modulus of elasticity, micro-drilling and indentation resistances were measured, and visual assessment was carried out. The differences and relationships between properties were statistically tested to determine significance of manufacturing parameters and reliability of used methods to predict properties at several levels of wood processing, and also to describe the influence of harvest period or timber treatment to quality and properties.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

  • OECD FORD obor

    20501 - Materials engineering

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/DG16P02M026" target="_blank" >DG16P02M026: Historické dřevěné konstrukce: typologie, diagnostika a tradiční opracování dřeva</a><br>

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2019

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    5th International Conference on Structural Health Assessment of Timber Structure, SHATiS’19: Proceedings

  • ISBN

    978-989-54496-2-0

  • ISSN

  • e-ISSN

  • Počet stran výsledku

    10

  • Strana od-do

    742-751

  • Název nakladatele

    Universidade do Minho

  • Místo vydání

    Braga

  • Místo konání akce

    Guimarães

  • Datum konání akce

    25. 9. 2019

  • Typ akce podle státní příslušnosti

    WRD - Celosvětová akce

  • Kód UT WoS článku