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Prediction of tensile strength of sawn timber: models for calculation of yield in strength classes
Linnéuniversitetet, Institutionen för byggteknik (BY).ORCID iD: 0000-0003-4518-570X
Linnéuniversitetet, Institutionen för byggteknik (BY).ORCID iD: 0000-0002-6410-1017
Linnéuniversitetet, Institutionen för byggteknik (BY).ORCID iD: 0000-0002-8513-0394
2020 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 53, no 3, p. 1-15, article id 55Article in journal (Refereed) Published
Abstract [en]

In Europe, strength classes for structural timber and glulam lamellae are defined by minimum requirements of characteristic values of the grade determining properties (GDPs). To fulfill these minimum requirements of characteristic values in the daily production at sawmills, indicating properties (IPs) to GDPs are calculated for each board and based on predetermined limits of the IPs (settings) boards are assigned to the graded class, or rejected. The aims of this paper is to address and discuss two different grading procedures/models that can be applied when settings for IPs that reflects a local board property are derived and to show how the yield in different T-classes depend on the model applied. It is not always that a board’s weakest cross-section is evaluated in a destructive test. An IP representing a local board property can therefore be determined either as the lowest property of the tested part of the board or as the lowest property along the whole board when applied to derive settings. Results presented in this paper show that too low settings and too large yields are obtained when the latter IP is employed. Similarly, IPs reflecting a global board property, like axial dynamic MOE, also give too low settings and too high yield in strength classes. This paper is the second and closing part of a series of two paper on prediction of GDPs and procedures for grading sawn timber into T-classes.

Place, publisher, year, edition, pages
Springer, 2020. Vol. 53, no 3, p. 1-15, article id 55
Keywords [en]
Grading of timber, Laser scanning, Fibre direction, Dynamic modulus of elasticity, Norway spruce
National Category
Other Civil Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:hj:diva-50155DOI: 10.1617/s11527-020-01485-wISI: 000534325800002OAI: oai:DiVA.org:hj-50155DiVA, id: diva2:1457019
Funder
Knowledge Foundation, 20150179Available from: 2020-05-04 Created: 2020-08-10Bibliographically approved

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Briggert, AndreasOlsson, AndersOscarsson, Jan

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