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Wood Science and Technology

Erschienen in:

01.05.2004 | Original

Influence of knot area ratio based grading rules on the engineering properties of Hem-fir used in Japanese post and beam housing

verfasst von: F. Lam, J. D. Barrett, S. Nakajima

Erschienen in: Wood Science and Technology | Ausgabe 2/2004

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Abstract

A study has been conducted to establish the influence of knot area ratio based grading rules on the bending properties of full size Hem-fir (Western Hemlock and Amabilis fir) timber used in Japanese post and beam building construction. Bending strength and modulus of elasticity test results and out turn information on the 105×105 mm², 90×90 mm², 45×105 mm², 30×105 mm², and 45×90 mm² specimens are presented in this paper. The in-grade test results indicate that the knot area ratio based grading rules can be successfully applied to the Hem-fir timber.

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In commercial practice specific KAR grading rules will be designed considering market requirements, product prices, and manufacturing costs.

American Society of Testing and Materials (ASTM) (1999) Annual book of ASTM standards. Section 4. Construction, vol 04.10 Wood. West Conshohocken, PA

Architectural Institute of Japan (1973) Standard for structural design of timber structures. Tokyo, Japan

Barrett JD, Lau W (1994) Canadian lumber properties. Jones ED (ed) Canadian Wood Council. Ottawa, Canada

Iwasaki KM (1998) In-grade test sampling program for Canadian Hem-fir. Report prepared for the Council of Forest Industries of BC. Vancouver, Canada

Lam F, Barrett JD, Nakajima S (2001) Engineering properties of Hem-fir used in Japanese post and beam housing. Forest Prod J 51(10):79–87

Leicester RH (1986) Confidence in estimates of characteristic values. In: proceedings of 19th conference of CIB-W18. Florence, Italy

Leicester RH, Bretinger HO, Fordham HF (1996) Equivalence of in-grade testing standards. In: Pproceedings of 29th conference of CIB-W18. Bordeaux, France

Ministry of Agriculture, Forest and Fisheries (1994) Japanese agricultural standard for structural softwood lumber. Japan

Ministry of Construction (2000) Notification no. 1452. Tokyo, Japan

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National Lumber Grades Authority (1998) Standard grading rules for Canadian lumber. Vancouver, Canada

Titel: Influence of knot area ratio based grading rules on the engineering properties of Hem-fir used in Japanese post and beam housing
verfasst von: F. Lam
J. D. Barrett
S. Nakajima
Publikationsdatum: 01.05.2004
Verlag: Springer-Verlag
Erschienen in: Wood Science and Technology / Ausgabe 2/2004
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-003-0214-4

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