Shearing strength performance in laminated lumber composed of several softwoods with the same modulus of elasticity
2010
Ohno, H., Tochigi-ken. Forestry Research Center, Utsunomiya (Japan) | Kameyama, Y. | Suzuki, H. | Yoshida, K. | Matsumoto, K. | Ishiguri, F. | Yokota, S. | Iizuka, K. | Yoshizawa, N.
In the present study, shearing strength performance was investigated for three types of laminated lumber (10 ply) composed of several softwood species which have almost the same modulus of elasticity in static bending (MOE). Sugi (Cryptomeria japonica D. Don) laminae were used for the inner 8 layers and hinoki (Chamaecyparis obtusa Sieb. et Zucc.) or karamatu (Larix kaempferi Carriere) laminae were used for the outermost 2 layers. In addition, laminated lumber members composed of 10 ply sugi laminae were also produced. Almost no difference in shearing strength was observed among the three types of laminated lumber, suggesting that the shearing strength of laminated lumber might be related to the shearing properties of the laminae. There was no significant correlation between shearing strength and dynamic modulus of elasticity (Esub(fr)) or MOE. Thus, it can be said that Esub(fr), and MOE of laminae are not related to the shearing strength of laminated lumber. Shearing strength of laminated lumber was more affected by density than by Esub(fr). Based on the obtained results, MOE and density of laminae should be considered for manufacturing laminated lumber composed of several softwood species.
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