Abstract
The aim of this study was to assess the static bending strength of pine glulam manufactured when obtaining the main yield, i.e., structural timber or timber to be used in the production of structural glulam. Analyses were conducted on pine timber harvested from three different locations in Poland. Two beam variants were manufactured, differing in the timber arrangement, horizontal vs. vertical. It was shown that the static bending strength of beams manufactured in the vertical timber arrangement variant is slightly higher than that of beams produced from horizontally arranged layers, with the latter beams characterised by a smaller confidence interval for this strength. Moreover, it was found that the difference in the value of the 5th percentile for both beam types is slight and both beam types are considered to exhibit a high bending strength of over 40 N/mm2.
Highlights
IntroductionLiterature concerning timber obtained from tree stems, timber conversion methods and analyses of structural elements manufactured from timber is vast, while the wide range of materials obtained from various tree species is being expanded rapidly and it is invariably considered very attractive
Sawn timber originated from the conversion of of round wood obtained from three forest districts: Olesno (50◦ 520 3000 N 18◦ 250 0000 E), round wood obtained from three forest districts: Olesno (50°52′30′′ N 18°25′00′′ E), Wymiarki and Kalisz Pomorski
High values of the modulus of elasticity are probably connected with the high density of the tested timber pieces
Summary
Literature concerning timber obtained from tree stems, timber conversion methods and analyses of structural elements manufactured from timber is vast, while the wide range of materials obtained from various tree species is being expanded rapidly and it is invariably considered very attractive. The scope of the above-mentioned studies does not fully reflect the behaviour of bent beams with vertically bonded lamellas It seems that the discussed problem needs to be analysed in more detail, since the thickness of side boards is much smaller than that of the main yield. It seems that the discussed problem needs to be analysed in more detail, since the thickness of side boards is muchsystem smallerresults than that the main yield. Used in the production of bonded structural elements or structural sawn timber
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