Tensile strength of glulam laminations of Nordic spruce

Preben Hoffmeyer, Lise Bräuner, Lars Boström, Kjell-Helge Solli

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Design of glulam according to the European timber code Eurocode 5 is based on the standard document prEN1194 , according to which glulam beam strength is to be established either by full scale testing or by calculation. The calculation must be based on a knowledge of lamination tensile strength. This knowledge may be obtained either by adopting a general rule that the characteristic tensile strength is sixty percent of the characteristic bending strength, or by performing tensile tests on an adequate number of laminations representative of the whole population. The present paper presents an investigation aimed at establishing such an adequate experimental background for the assignment of strength classes for glulam made of visually strength graded laminations from Nordic sawmills. The investigation includes more than 1800 boards (laminations) of Norway spruce (Picea abies) sampled from eight different regions in Scandinavia, two in Norway, two in Finland and four in Sweden. About twenty percent of the sample is tested in bending and the rest in tension. The investigation includes laminations of different depth for the assessment of size effect. The proper glulam classes are asssigned to laminations of the two major visual strength grades currently used in the Scandinavian countries
    Original languageEnglish
    Title of host publicationProceedings of PTEC '99
    Place of PublicationRotorua, New Zealand
    PublisherForest Research Bulletin No. 212
    Publication date1999
    Pages223-230
    Publication statusPublished - 1999
    EventPacific Timber Engineering Conference - Rotorua, New Zealand
    Duration: 14 Mar 199918 Mar 1999

    Conference

    ConferencePacific Timber Engineering Conference
    Country/TerritoryNew Zealand
    CityRotorua
    Period14/03/199918/03/1999

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