Performance of timber board models for prediction of local bending stiffness and strength-with application on douglas fir sawn timber

Olsson, Anders, 1973- (author): Linnéuniversitetet,Institutionen för byggteknik (BY)

Hu, Min, 1979- (author): Linnéuniversitetet,Institutionen för byggteknik (BY)

Oscarsson, Jan, 1958- (author): Linnéuniversitetet,Institutionen för byggteknik (BY)

(creator_code:org_t)

2022-11-23
2022
English.
In: Wood and Fiber Science. - : Society of Wood Science Technology. - 0735-6161. ; 54:4, s. 226-245

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Abstract Subject headings

Efficient utilization of structural timber requires accurate methods for machine strength grad-ing. One of the most accurate methods presented this far is based on data of local fiber orientation on board surfaces, obtained from laser scanning. In this paper, two potential improvements of this method are exam-ined. The first one consists of replacing a model based on simple integration over cross sections of boards for calculation of local bending stiffness by a 3D solid finite element (FE) model from which local bending stiffness is derived. The second improvement concerns replacement of a simple model for the fiber orienta-tion in the interior of board by a more advanced one taking location of pith and growth direction of knots into account. Application of the alternative models on a sample of more than 200 Douglas fir boards, size 40 mm x 100 mm x 3000 mm, cut from large logs, show that each of the evaluated model improvements contributes to improved grading accuracy. When local bending stiffness is calculated utilizing the herein suggested FE model in combination with the improved model of fiber orientation in the interior of boards, a coefficient of determination to bending strength as high as 0.76 is obtained. For comparison, a coefficient of determination of 0.71 is obtain using the simpler original models.

LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Trävetenskap (hsv//swe)
AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Wood Science (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Building Technologies (hsv//eng)

By the author/editor: Olsson, Anders, ...; Pot, G.; Viguier, J.; Hu, Min, 1979-; Oscarsson, Jan, ...

About the subject

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Wood Science

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Building Technol ...

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