The bending strength of laminated beams composed of Douglas fir [Pseudotsuga menziesii timber] and sugi [Cryptomeria japonica timber]
2001
Hasegawa, S.(Toyama-ken. Forestry and Forest Products Research Center, Imizu (Japan)) | Inoue, M.
The author examined the bending strength of Japanese cedar laminated beams with different compositions of wood species, which used Douglas fir as the outer layer lamina. Douglas fir is used commonly as a lamina in structural laminated beams, since its strength is higher than cedar. The number of composite lamina of the laminated beams was 10. The results are summarized as follows: 1) The bending strength (modulus of direct elasticity, and bending strength) of the laminated beams increased, as the modulus of elasticity of the lamina increased. 2) Bending modulus of elasticity of the laminated beams could be estimated by the modulus of the composite lamina. 3) Under the experimental conditions (lamina composition, section size, and loading method), shear deflection accounted for all deflections in the bending became 7.67%. The effect of the shearing deformation on the apparent bending modulus of elasticity was large. 4) At most edges of the outer layer lamina, larger stress was observed than was estimated by the apparent bending strength. Actual shearing stress was a little smaller than the apparent shearing stress.
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