Mechanical Performance of Sugi (Cryptomeria japonica) Wooden Frame-Construction Lumber and Evaluation of Stress Grading

Shiiba, Atsushi; Aratake, Shiro; Fujimoto, Yoshiaki; Oda, Hisato; Matsumoto, Akihiro

doi:10.2488/jwrs.58.90

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Although air-dry density showed significant relationships with both the MOE and MOR overall and in SS grade lumber, the correlation coefficients were lower. Similar weak correlation coefficients between density and MOR were found in L. kaempferi lamina (r = 0.242) [32], and 2 by 4 lumber of C. japonica (r = 0.094) [13]. In addition, the relationships between wood density and MOR might be affected by presence of large amounts of arabinogalactan in the species.…”

Section: Correlations Between Lumber Propertiesmentioning

confidence: 52%

“…Numerous studies have focused on mechanical properties, especially the modulus of elasticity (MOE) and modulus of rupture (MOR) in bending for structural lumber sawn from softwood species grown in plantations and natural forests [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Characteristic values, such as the lower tolerance limits of the MOE and MOR, are very important for structural lumber in construction [10,13,[20][21][22]. The 5th percentile ultimate stress value is used to calculate allowable design stress [4].…”

Section: Introductionmentioning

confidence: 99%

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Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

et al. 2020

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The modulus of elasticity (MOE) and modulus of rupture (MOR) were evaluated for 190 pieces of dimension lumber (2 by 4 lumber, 38 by 89 mm in cross-section) produced from Larix sibirica trees grown in Mongolia. The 5% tolerance limits of the MOE and MOR were 5.70 GPa and 15.1 MPa, respectively. The value of the 5% tolerance limit of the MOR exceeded the characteristic value of 2 by 4 lumber in visual grading class No. 3 of the Japanese Agricultural Standard for the D. fir-L, Hem-Tam, JS-III and S-P-F softwood species groups. A significant positive correlation was found between the MOE and MOR, although air-dry density was weakly correlated with bending properties in L. sibirica.

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Section: Correlations Between Lumber Propertiesmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

et al. 2020

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“…Mechanical properties of structural lumber, such as dimension lumber, have been investigated for softwood species by many researchers [3][4][5][6][7][8][9][10][11][12][13]. In terms of mechanical properties, the 5% lower tolerance limit with a 75% confidence level (f 0.05 ) in modulus of elasticity (MOE) and modulus of rupture (MOR) is important information for utilization of wood as structural material [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

et al. 2020

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The quality of dimension lumber (2 by 4 lumber) was preliminarily investigated in four common Mongolian softwoods: Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. to produce high quality dimension lumber for structural use. In total 61, 39, 67, and 37 pieces of lumber were prepared for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. The lumber was visually graded and then tested in static bending to obtain the 5% lower tolerance limits at 75% confidence level (f0.05) of the modulus of elasticity (MOE) and the modulus of rupture (MOR). In addition, the effects of sawing patterns on bending properties were also analyzed. The f0.05 of the MOE and MOR were 4.75 GPa and 15.6 MPa, 3.39 GPa and 11.0 MPa, 3.78 GPa and 11.7 MPa, and 6.07 GPa and 22.3 MPa for Pinus sylvestris, Pinus sibirica, Picea obovata, and L. sibirica, respectively. These results suggested that with a few exceptions, characteristic values of MOR in the four common Mongolian softwoods resembled those in similar commercial species already used. In visual grading, over 80% of total lumber was assigned to select structural and No. 1 grades in Pinus sylvestris and Pinus sibirica, whereas approximately 40% of total lumber in L. sibirica was No. 3 and out of grades. Sawing patterns affected bending properties in Pinus sylvestris and L. sibirica, but did not affect Pinus sibirica and Picea obovata. Dynamic Young's modulus was significantly correlated with bending properties of dimension lumber for the four species. Based on the results, it was concluded that dimension lumber for structural use can be produced from the four common Mongolian softwoods.

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Sawn-timber quality of six half-sib families of hinoki cypress (Chamaecyparis obtusa (Siebold et Zucc.) Endl.)

Takahashi

Ishiguri

Nezu

et al. 2022

Wood Material Science & Engineering

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Mechanical Performance of Sugi (Cryptomeria japonica) Wooden Frame-Construction Lumber and Evaluation of Stress Grading

Cited by 3 publications

References 4 publications

Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

Bending properties of dimension lumber produced from Siberian larch (Larix sibirica) in Mongolia

Preliminary evaluation for quality of dimension lumber in four common softwoods in Mongolia

Sawn-timber quality of six half-sib families of hinoki cypress (Chamaecyparis obtusa (Siebold et Zucc.) Endl.)

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