TAILIEUCHUNG - Báo cáo khoa học: "Comparison of flexural and shear properties of southern pine LVL and lumber from young plantation and natural stands*"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Comparison of flexural and shear properties of southern pine LVL and lumber from young plantation and natural stands. | Ann Sci For 1996 53 1167-1175 Elsevier INRA 1167 Original article Comparison of flexural and shear properties of southern pine LVL and lumber from young plantation and natural stands EJ Biblis School of Forestry Auburn University Auburn AL 36849 USA Receveid 24 August 1994 accepted 30 April 1996 Summary - Edgewise flexural strength and stiffness values are reported of southern yellow pine X cm2 2 X 4 laminated veneer lumber LVL made from veneers of 20-year-old plantation trees veneer of 28- and 40-year-old trees of natural stands and LVL composites made by mixing veneers of 20- and 40-year-old trees. The obtained flexural properties of LVL were correlated to veneer thickness and grade as well as to tree age. Flexural and shear properties of LVL are compared to properties of solid lumber obtained from the same groups and quality of trees. The distribution of allowable design flexural strength Fb and stiffness E corresponding to SPIB-91 lumber grades of various LVL groups determined. laminated veneer lumber southern pine plantation Resume - Comparaison des propriétés en flexion et cisaillement de poutres de bois massif reconstitué et de bois massif de pins du Sud provenant de plantations et de peuplements naturels. Des poutres en bois massif reconstitué LVL sont réalisées à partir de placages déroulés section 5 08x10 16 cm2 de pin Pinus taeda L . Trois type de poutres sont testées en flexion sur chant et en cisaillement. Elies sont réalisées i à partir de placages déroulés dans des pins de plantation âgés de 20 ans ii à partir de placages d arbres âgés de 28 et 40 ans provenant de peuplements naturels et Hi en mélangeant des placages d arbres de plantation et des placages d arbres de 40 ans. Les mesures de flexion obtenues sont corrélées à 1 épaisseur des placages et à leur classement ainsi qu à I age des arbres. Les propriétés de flexion et de cisaillement du LVL sont comparées aux propriétés du bois massif mesurées sur des arbres comparables en âge et .

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