Journal of the Korean Wood Science and Technology

  • 제39권5호
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  • Pages.444-450
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  • 2011
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  • 1017-0715(pISSN)
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  • 2233-7180(eISSN)
한국목재공학회 (The Korean Society of Wood Science & Technology)
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Bending Strength of Korean Softwood Species for 120×180 mm Structural Members

  • Pang, Sung-Jun (Department of Forest Sciences, Seoul National University, Research Institute for Agriculture and Life Sciences) ;
  • Park, Joo-Saeng (Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Hwang, Kweon-Hwan (Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Jeong, Gi-Young (Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Park, Moon-Jae (Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Lee, Jun-Jae (Department of Forest Sciences, Seoul National University, Research Institute for Agriculture and Life Sciences)
  • 투고 : 2011.08.17
  • 심사 : 2011.09.20
  • 발행 : 2011.09.25
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초록

The goal of this study is to investigate bending properties of domestic timber. Three representative structural timber from Larix kaempferi, Pinus koraiensis, and Pinus densiflora, in the northeastern South Korea were selected. Visual grading for the timber was conducted based on KFRI notification 2009-01 and the bending strength for the timber was evaluated based on ASTM D 198 bending. The high percentage of grade 1 and 2 for Larix kaempferi shows that the KFRI notification was optimized for this species. The bending strength distributions from Pinus koraiensis and Pinus densiflora were very similar. It could be possible to specify the allowable bending properties of these two Specification using a united species group similar to spruce-pine-fir. Lastly, the bending strength of $120{\times}180mm$ structural members was higher than both existing values in KBC 2009 and design values for timber of imported species described in the NDS. Thus, 120 mm thick domestic softwoods could replace the commercial imported species and the KBC should be modified to provide design values for both timber and dimensional lumber, respectively, like NDS.

키워드

참고문헌

  1. KFRI notification 2009-01. Korea Forest Research Institute.
  2. Korean Building Code 2009. Minister of Land, Transport and Maritime Affairs notification 2009-1245.
  3. American Society for Testing and Materials. ASTM D-198. Standard Methods of Static Tests of Lumber in Structural Sizes. pp. 2-6.
  4. American Society for Testing and Materials. ASTM D-245. Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber. p. 11.
  5. American Forest & Paper Association. 2005. National Design Specification (NDS) for Wood Construction Supplement: Design Values for Wood Construction 2005 Edition. pp. 44-49.
  6. Jang, S. S. 1989. Measurement and modification of allowable properties of wood. Mokchae Konghak 17(2): 74-83.
  7. Oh, S. C., M. J. Park, and K. Shim. 1993. Stress Grading of Domestic Softwood 2${\times}$4 Lumber. Journal of Korea Furniture Society 4(1): 8-13.
  8. Oh, S. C. 1996. Assignment of the Allowable Design Values for Domestic Softwood Structural Lumber. Mokchae Konghak 24(1): 11-16.
  9. Foley, C. 2001. A three-dimensional paradigm of fiber orientation in timber. Wood Science and Technology 35(5): 453-465. https://doi.org/10.1007/s002260100112
  10. Lee, J. J., G. C. Kim, K. M. Kim, and J. K. Oh. 2003. Distribution Characteristics of Bending Properties for Visual Graded Lumber of Japanese Larch. Mokchae Konghak 31(5): 72-79.
  11. Park, C. Y., H. K. Kim, and J. J. Lee. 2004. Study on soft conversion from ASD to RBD code in Larch. Mokchae Konghak 32(5): 45-50.
  12. Park, C. Y., S. J. Pang, J. S. Park, K. M. Kim, M. J. Park, and J. J. Lee. 2010. Study of the distribution properties and LRFD code conversion in Japanese larch. Mokchae Konghak 38(2): 94-100. https://doi.org/10.5658/WOOD.2010.38.2.94
  13. Lim, J. A., J. K. Oh, H. M. Yeo, and J. J. Lee. 2010. Feasibility of Domestic Yellow Poplar (Liriodendron tulipifera) Dimension Lumber for Structural Uses, Mokchae Konghak 38(6): 470-479. https://doi.org/10.5658/WOOD.2010.38.6.470
  14. Pang, S. J., J. K. Oh, C. Y. Park, J. S. Park, M. J. Park, and J. J. Lee. 2011. Characteristics Evaluation of Bending Strength Distributions on Revised Korean Visual Grading Rule, Mokchae Konghak 39(1): 1-6.

피인용 문헌

  1. Determination of Grades and Design Strengths of Machine Graded Lumber in Korea vol.43, pp.4, 2015, https://doi.org/10.5658/WOOD.2015.43.4.446
  2. Review of Visual Grading and Allowable Stress Determination Methodologies for Domestic Softwood vol.43, pp.1, 2015, https://doi.org/10.5658/WOOD.2015.43.1.25
  3. Evaluation of Allowable Bending Stress of Dimension Lumber; Confidence Levels and Size-adjustment vol.41, pp.5, 2013, https://doi.org/10.5658/WOOD.2013.41.5.432
  4. Analysis of Allowable Stresses of Machine Graded Lumber in Korea vol.43, pp.4, 2015, https://doi.org/10.5658/WOOD.2015.43.4.456
  5. Load sharing and weakest lamina effects on the compressive resistance of cross-laminated timber under in-plane loading vol.64, pp.5, 2018, https://doi.org/10.1007/s10086-018-1741-9