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http://dx.doi.org/10.5658/WOOD.2010.38.6.470

Feasibility of Domestic Yellow Poplar (Liriodendron tulipifera) Dimension Lumber for Structural Uses  

Lim, Jin-Ah (Dept. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Oh, Jung-Kwon (Dept. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Yeo, Hwan-Myeong (Dept. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Lee, Jun-Jae (Dept. of Forest Sciences, College of Agriculture & Life Sciences, Seoul National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.38, no.6, 2010 , pp. 470-479 More about this Journal
Abstract
In this study, the visual grading based on the visual characteristics and structural timber bending test were conducted for domestic yellow poplar dimension lumber. Structural performance of domestic yellow poplar dimension lumber was conducted through the evaluation of strength and stiffness. Visual grading rule of yellow poplar dimension lumber did not exist in Korea. Visual grading of yellow poplar dimension lumber was performed according to the NSLB (Northern Softwood Lumber Bureau) standard grading rules including several hardwood dimension lumber. The allowable bending stress was calculated from the results of a visual grading. Compared with NDS (National Design Specification), the yellow poplar dimension lumber showed enough strength for structural uses. In addition, the visual grading was performed according to the KFRI (Korea Forest Research Institute) grading rule to calculated allowable bending stress and to evaluated the feasibility. The yellow poplar was classified into the pine groups by the KFRI criteria regulated by specific gravity. Allowable bending stress based on weibull distribution had became highly than KFRI criteria, as No. 1 (10.0 MPa), No. 2 (7.4 MPa) and No. 3 (4.1 MPa). And the availability of yellow poplar dimension lumber for structural uses had been confirmed. The Modulus of Elasticity (MOE) of domestic yellow poplar dimension lumber had not met the NDS and KFRI criteria. However, for the use of domestic yellow poplar, average values of MOE which obtained through this test were suggested as design value for domestic yellow poplar. Design values were supposed No. 1, 2 (9,000 MPa) and No. 3 (8,000 MPa).
Keywords
hardwood; dimension lumber; yellow poplar; visual grading; allowable bending stress;
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Times Cited By KSCI : 4  (Citation Analysis)
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