- Original Article
- Published:
Methods to estimate the length effect on tensile strength parallel to the grain in Japanese larch
Journal of Wood Science volume 47, pages 269–274 (2001)
Abstract
To find a desirable method for estimating the length effect on tensile strength (σ t), we used three methods to analyze theσ t data from a Japanese larch (Larix kaempferi) small, clear specimen. These methods included a nonparametric method, the projection method of Hayashi, and a proposed method. The estimated length effect parameters (g) by the nonparametric method were 0.0237 and 0.0626 for 50th and 5th percentileσ t distributions, respectively. The projection method requires a standardE f level (E *: dynamic Young's modulus), arbitrarily chosen for calculating theg value. Theg values from the projection method were 0.1122 for lowE *, 0.0898 for averageE *, and 0.0759 for highE *. The estimatedg values by the proposed method using selectedσ t data were 0.1020 and 0.1838 for the 50th and 5th percentiles, respectively. Among the three methods, the nonparametric method did not consider the different distribution of Young's modulus among specimens, and the estimated length effect parameters (g) by this method were small. The projection method reduced the influence of Young's modulus, but the length effect parameters varied with theE * level. The proposed method minimized the dependence onE f distributions among specimens. we believe the latter method is desirable for estimating the length effect on tensile strength.
References
Hayashi T (1998) Engineered wood. Nihon Mokuzai Shinbunsha, Tokyo
American Society for Testing and Materials (1995) Standard practice for establishing allowable properties for visually-graded dimension lumber from in-grade tests of full-size specimens. ASTM D1990-95, ASTM
Japanese Industrial Standards Committee (1994) Methods of test for woods: JIS Z 2101 (in Japanese). Japanese Standards Association, Tokyo
Madsen B (1992) Structural behaviour of timber. Timber Engineering, North Vancouver, pp 237–247
Madsen B (1990) Size effects in defect-free Douglas fir. Can J Civil Eng 17:238–242
Masuda M, Okohira Y (1985) Size effect of wood in bending (in Japanese). Bull Faculty Agric Mie Univ 71:61–69
Okohira Y, Masuda M, Suzuki N (1989) The size effect of compressive strength of wood (in Japanese). Bull Faculty Bioresources Mie Univ 2:13–21
Okohira Y, Masuda M, Suzuki N (1988) The size effect of tensile strength on western hemlock (in Japanese). Bull Faculty Bioresources Mie Univ 1:1–6
Saito I, Goto C, Fujita K, Zushi T, Komatsu K, Iijima Y (2000) Discussion on tensile strength of laminae used for glulam. In: Abstracts of the 50th annual meeting of the Japan Wood Research Society, Kyoto, p 125
Madsen B (1990) Length effects in 38mm spruce-pine-fir dimension lumber. Can J Civil Eng 17:226–237
Hayashi T, Miyatake A, Miyahara H (1997) Size effect on tensile strength of sugi laminae (in Japanese). Mokuzai Kogyo 52:15–19
Zhu J, Nakano T, Tokumoto M, Takeda T (2000) Variation of tensile strength with annual rings for lumber of Japanese larch. J Wood Sci 46:284–288
Sobue N (1986) Measurement of Young's modulus by the transient longitudinal vibration of wooden beams using a fast Fourier transformation spectrum analyzer. Mokuzai Gakkaishi 32:744–747
American Society for Testing and Materials (1994) Standard practice for evaluating allowable properties for grades of structural lumber. ASTM D2915-94
Takeda T, Hashizume T (1999) Differences of tensile strength distribution between mechanically high-grade and low-grade Japanese larch lumber. I. Effect of length on the strength of lumber. J Wood Sci 45:200–206
Sugiyama H (1976) Design of timber engineering structure (in Japanese). Maruzen, Tokyo, pp 80–85
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhu, J., Kudo, A., Takeda, T. et al. Methods to estimate the length effect on tensile strength parallel to the grain in Japanese larch. J Wood Sci 47, 269–274 (2001). https://doi.org/10.1007/BF00766712
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00766712