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Materials 2016, 9(2), 89; doi:10.3390/ma9020089

Experimental and Statistical Evaluation of the Size Effect on the Bending Strength of Dimension Lumber of Northeast China Larch

1
Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China
2
International Center for Bamboo and Rattan, Beijing 100102, China
*
Author to whom correspondence should be addressed.
Academic Editor: Kim L. Pickering
Received: 8 December 2015 / Revised: 13 January 2016 / Accepted: 20 January 2016 / Published: 30 January 2016
(This article belongs to the Special Issue Bio- and Natural-Fiber Composites)
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Abstract

This study investigated the size effect on the bending strength (modulus of rupture—MOR) of dimension lumber of Northeast China larch (Larix gmelinii); providing a basis for the further application in light wood frame construction. Experimental and statistical evaluations were conducted on the bending strength. A total of 2409 full-size dimension lumber samples were tested by static bending tests; which included three different sizes: 2 × 3; 2 × 4; and 2 × 6. Results indicate that the size has a significant effect on the MOR. Both the chi-square (χ2) and Kolmogorov-Smirnov (K-S) test results show that the lognormal distribution generally fits to the MOR better than to the normal distribution. Additionally; the effects of partial safety factor (γR) and live-to-dead load ratio (ρ) were studied by reliability analysis. Reliability analysis results indicate that the reliability index increases nonlinearly with the decrease of γR and the rise of ρ. Finally; the design value of bending strength and its adjusting factor of size effect of 2 × 3; 2 × 4; and 2 × 6 larch dimension lumber were obtained according to the Chinese National Standards’ requirements of the reliability index. View Full-Text
Keywords: size effect; bending strength; dimension lumber; Northeast China larch (Larix gmelinii) size effect; bending strength; dimension lumber; Northeast China larch (Larix gmelinii)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhong, Y.; Ren, H.-Q.; Jiang, Z.-H. Experimental and Statistical Evaluation of the Size Effect on the Bending Strength of Dimension Lumber of Northeast China Larch. Materials 2016, 9, 89.

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