Effects of visual strength grading of white fir sawn timber on some mechanical properties

• Hektor Thoma ; Leonidha Peri ; Entela Lato ; Doklea Quku ; Kola Erald ^[1]
  1. [1] Faculty of Forestry Sciences (Albania)
• Localización: INNODOCT/13.International Conference on Innovation, Documentation and Teaching Technologies: New changes in technology and innovation / Fernando J. Garrigós Simón (ed. lit.), Marta Peris Ortiz (ed. lit.), Ignacio Gil Pechuán (ed. lit.), Sofía Estellés Miguel (ed. lit.), Carlos Manuel Dema Pérez (ed. lit.), José Onofre Montesa Andrés (ed. lit.), María Pilar Conesa García (ed. lit.), María Teresa Barberá Ribera (ed. lit.), Carlos Rueda Armengot (ed. lit.), Yeamduan Narangajavana Kaosiri (aut.), 2013, ISBN 9788490480861, págs. 104-108
• Idioma: inglés
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  • Texto Completo Libro
• Resumen

  • The visual grading of structural sawn timber is based on measurement of the singularities and characteristics present in timber pieces, such as: knot size, slope of grain, fissures, insects damages, etc. Their limits define the different visual strength classes, each having characteristic values of physical and mechanical properties. Specifications, design and the efficient use of structural timber is heavily influenced from the study of the mechanical properties.

    This study is focused on the effects of visual strength grading of white fir (Abies Alba Mill.) sawn timber for structural purposes on some mechanical properties.

    White fir sawn timber of the same geographic origin, used for structural purposes is visually graded according to EN 14081-1 “Strength graded structural timber with rectangular cross section” in two classes (i) C18 and below and (ii) C18 and above. From the timber classified in each of the grading classes are chosen 2 samples of specimens prepared according to EN-384.

    All sample specimens are tested according to the norm EN 408 in order to obtain characteristic values for bending strength and compression strength parallel to grain.

    Test values of mechanical properties as bending strength and compression strength parallel to grain show no significant differences and are congruent with the values of S3 (C18) and S2 (C24) strength class category. None of the specimens tested have values of mechanical properties of the S1 strength category (above C24)