Small-diameter logs are intended to function as high-value structural timber. Bending strength properties is an essential phenomenon for structural lumber. Herein, the modulus of elasticity, the modulus of rupture and the allowable bending stress (ABS) of domestic (Korea) small and large-diameter larch and large diameter Douglas fir timber were measured and compared according to the standard of ASTM D 2915. Samples were visually graded as Grade 1 to Grade 4 following the provisions included in KS F 3021.2013. The large-diameter Douglas fir timber (Grade 1 to Grade 4) exhibited the highest MOE value, but in Grade 4, it showed the lowest MOR value compared with the small and large diameter of larch timber. The ABS of small-diameter larch was 12.0 MPa, higher relative to KBC 2009 Grade 1 structural lumber (8.0 MPa). The ABS of large-diameter of larch and Douglas fir timber exhibited 15.5 and 18.1 MPa, respectively.
AllenGS, OwensJN.1972. The life history of Douglas Fir., Life Hist. Douglas Fir.
2.
CukorJ, ZeidlerA, VacekZ, VacekS, ŠimůnekV, GalloJ.2020. Comparison of growth and wood quality of Norway spruce and European larch: effect of previous land use. Eur J For Res. 139:459–472.
3.
CurtisRO.1967. Height-diameter and height-diameter-age equations for second-growth Douglas-Fir. For Sci. 13:365–375.
De FegelyR.2005. Forests for Woods’ Sake: the demand for primary Wood Products to 2020.
6.
DongL, XieY, SunX.2020. Full-diallel-based analysis of genetic parameters for growth traits in Japanese larch (Larix kaempferi). New For. 51:261–271. DOI:10.1007/s11056-019-09729-6.
7.
F. KS. n.d. ‘2199 (2011), Determ. Moisture Content Wood,’ Korean Stand. Assoc. Seoul, Korea.
8.
F. KS. n.d. 2150: 2004. 2004, Method Static Bend. Test Full Sized Struct. Lumber. Korean Stand. Assoc. Seoul, Korea.
9.
FranklinJF.1981. Ecological characteristics of old-growth Douglas-fir forests, US Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station.
10.
FranklinJF, DonatoDC.2020. Variable retention harvesting in the Douglas-fir region. Ecol Process. 9:1–10.
11.
HeinPRG, SilvaJRM, BrancheriauL.2013. Correlations among microfibril angle, density, modulus of elasticity, modulus of rupture and shrinkage in 6-year-old eucalyptus urophylla× E. grandis. Maderas Cienc y Tecnol. 15:171–182.
12.
HongJ-P, OhJ-K, ParkJ-S, HanYJ, PangS-J, KimC-K, LeeJ-J.2015. Analysis of allowable stresses of machine graded lumber in Korea. J. Korean Wood Sci Technol. 43:456–462.
13.
Il YooB.1997. Asia-Pacific forestry sector outlook study, Working paper series. FAO.
14.
IsebrandsJG, HuntCM.2007. Growth and wood properties of rapid-grown Japanese larch. Wood Fiber Sci. 7:119–128.
15.
K.S. Association. 2001. KS F 2198, Determ. Density Specif. Gravity Wood.
16.
K.S. Association. 2004. Method of bending test for wood. KS F. 2208.
17.
K.S. Association. 2013. KS F 3021 structural glued laminated timber, Minist. Knowl. Econ. Korean Agency Technol. Stand.
18.
KimY-H, JangS-S.2014. Effects of finger-joint on bending performance of square timbers produced from domestic small diameter larch logs. J. Korean Wood Sci Technol. 42:301–308.
19.
KimY-H, ShinI-J, YangJ-M, JangS-S.2012. Allowable stress calculation of domestic Japanese larch small diameter lumbers. J Korea Furnit Soc. 23:214–221.
20.
LamF, BarrettJD, NakajimaS.2005. Influence of knot area ratio on the bending strength of Canadian Douglas fir timber used in Japanese post and beam housing. J Wood Sci. 51:18–25.
21.
LeeC-T.1993. Utilization of small timber. J Korean Wood Sci Technol. 21:65–73.
22.
LeeC-T, KimS-C.1990. A study on sawing and utilization structure of lumber from small-diameter logs of Larix leptolepis. J Korean Wood Sci Technol. 18:53–68.
23.
LeeS-M, KimK-D.2015. Outlook of the timber supply to the wood industry buildup master plan. J Korea Acad Coop Soc. 16:1715–1724.
24.
LeeDK, ParkPS, ParkYD.2015. Forest restoration and rehabilitation in the Republic of Korea, restor. boreal temp. For. Second Ed. CRC Lewis, Boca Raton, Florida. USA. 217–231.
25.
MasciaNT, KretschmannDE, RibeiroAB.2020. Evaluation of tension perpendicular to grain strengths in small clear samples of sugar maple for radial,tangential and 45-degree loading directions. Mater Res.23(3). DOI:10.1590/1980-5373-mr-2019-0323.
26.
PangS, OhJ, ParkC, ParkJ, ParkM, LeeJ.2011. Characteristics evaluation of bending strength distributions on revised Korean visual grading rule. J Korean Wood Sci Technol. 39:1–7.
27.
Riesco MuñozG, Remacha GeteA.2012. Prediction of bending strength in oak beams on the basis of elasticity, density, and wood defects. J Mater Civ Eng. 24:629–634.
28.
RochaMFV, CostaLR, CostaLJ, de AraújoACC, SoaresBCD, HeinPRG.2018. Wood knots influence the modulus of elasticity and resistance to compression. Floresta e Ambient. 25(4). DOI:10.1590/2179-8087.090617.
29.
RuelJ-C, AchimA, HerreraRE, CloutierA.2010. Relating mechanical strength at the stem level to values obtained from defect-free wood samples. Trees. 24:1127–1135.
30.
SaavedraH, García-HerreraC, VascoDA, Salinas-LiraC.2020. Characterization of mechanical performance of pinus radiata wood impregnated with octadecane as phase change material. J Build Eng.:101913. DOI:10.1016/j.jobe.2020.101913.
31.
SpinelliR, EliassonL, HanH-S.2020. A critical review of comminution technology and operational logistics of wood chips. Curr For Reports. 6:210–219. DOI:10.1007/s40725-020-00120-9.
32.
TumenjargalB, IshiguriF, TakahashiY, NezuI, BaasanB, ChultemG, Aiso-SanadaH, OhshimaJ, YokotaS.2020a. Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia. J Wood Sci. 66:17. DOI:10.1186/s10086-020-01863-6.
33.
TumenjargalB, IshiguriF, TakahashiY, NezuI, BaasanB, ChultemG, Aiso-SanadaH, OhshimaJ, YokotaS.2020b. Predicting the bending properties of Larix sibirica lumber using nondestructive-testing methods. Int Wood Prod. J. 11:115–121. DOI:10.1080/20426445.2020.1735754.
34.
ZobelBJ, van BuijtenenJP.1989. Wood variation and wood properties. In: Wood variation. Springer; p. 1–32.
