Official Journal of the Japan Wood Research Society
Table 1 Results of the shear tests
Specimens | Support span [mm] | Span-to-thickness ratio | n | Out-of-plane shear strength [N/mm2] | CV [%] | Number of laminae in transverse layers | Failure type | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Min | Mean | Max | S | SB | B | ||||||
3-layer 4-ply (MC: 10.8%) (Density: 512 kg/m3) | 600 | 5 | 4 | 2.37 | 2.66 | 2.98 | 10.5 | 10 | 4 | 0 | 0 |
720 | 6 | 4 | 2.06 | 2.22 | 2.32 | 5.5 | 12 | 4 | 0 | 0 | |
960 | 8 | 4 | 1.64 | 1.66 | 1.67 | 0.9 | 16 | 3 | 1 | 0 | |
1200 | 10 | 4 | 1.33 | 1.38 | 1.45 | 3.6 | 20 | 4 | 0 | 0 | |
1440 | 12 | 4 | 1.20 | 1.27 | 1.33 | 4.6 | 24 | 4 | 0 | 0 | |
1680 | 14 | 4 | 1.03 | 1.07 | 1.12 | 3.4 | 28 | 3 | 0 | 1 | |
1920 | 16 | 4 | 0.81 | 1.04 | 1.24 | 17.7 | 32 | 2 | 0 | 2 | |
5-layer 7-ply (MC: 11.2%) (Density: 523 kg/m3) | 1050 | 5 | 4 | 2.56 | 2.77 | 2.94 | 6.4 | 18 | 3 | 1 | 0 |
1260 | 6 | 6 | 1.92 | 2.11 | 2.33 | 6.9 | 22 | 3 | 3 | 0 | |
1680 | 8 | 4 | 1.57 | 1.63 | 1.72 | 4.1 | 28 | 3 | 1 | 0 | |
2100 | 10 | 4 | 1.72 | 1.76 | 1.79 | 1.6 | 34 | 4 | 0 | 0 | |
2520 | 12 | 4 | 1.21 | 1.44 | 1.58 | 11.2 | 42 | 3 | 0 | 1 | |
2940 | 14 | 4 | 0.76 | 1.27 | 1.59 | 29.9 | 48 | 1 | 1 | 2 | |
7-layer 7-ply (MC: 11.2%) (Density: 514 kg/m3) | 1050 | 5 | 4 | 2.15 | 2.21 | 2.29 | 2.9 | 27 | 4 | 0 | 0 |
1260 | 6 | 4 | 1.49 | 1.78 | 1.91 | 11.0 | 33 | 2 | 1 | 1 | |
1680 | 8 | 4 | 1.28 | 1.47 | 1.55 | 9.0 | 42 | 4 | 0 | 0 | |
2100 | 10 | 4 | 1.38 | 1.60 | 1.73 | 9.3 | 51 | 1 | 1 | 2 | |
2520 | 12 | 4 | 1.17 | 1.31 | 1.58 | 14.7 | 63 | 1 | 0 | 3 | |
2940 | 14 | 4 | 1.01 | 1.18 | 1.45 | 16.0 | 72 | 2 | 0 | 2 | |
3360 | 16 | 4 | 0.63 | 0.79 | 0.88 | 14.6 | 81 | 0 | 0 | 4 | |
9-layer 9-ply (MC: 11.6%) (Density: 501 kg/m3) | 1260 | 6 | 4 | 1.67 | 1.74 | 1.77 | 2.8 | 52 | 3 | 0 | 1 |
2160 | 8 | 4 | 1.46 | 1.56 | 1.64 | 4.8 | 72 | 3 | 0 | 1 | |
2700 | 10 | 4 | 1.20 | 1.34 | 1.50 | 9.3 | 88 | 3 | 0 | 1 | |