STRENGTH PROPERTIES OF 2-PLY LAMINATED LU MBER .2. MODULUS OF RUPTUREIN FLATWISE BENDING

Flatwise bending tests were made on two-ply laminated lumber composed of mechanically-graded sugi (Cryptomeria japonica D. Don). Effects of the lamination on the distribution of the moduli of rupture (MOR) are discussed. The laminating effects which decreased the variations of th e strength distributions, were not remarkable. The average MOR and the lower 5% exclusion limits of the 2 -ply laminated lumber with finger- joints were the same as those of single finger-jointed lumber. This re sult was in sharp contrast to the previous tensile test results in whi ch laminating effects were observed more positively.