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Official Journal of the Japan Wood Research Society

Table 2 Maximum load and initial crack load

From: Study on the strength of glued laminated timber beams with round holes: difference in structural performance between homogeneous-grade and heterogeneous-grade timber

H (mm) D (mm) E105-F345, homogeneous-grade E105-F300, heterogeneous-grade
Maximum load (kN) Initial crack load (kN) Maximum load (kN) Initial crack load (kN)
No. 1 No. 2 Ave No. 1 No. 2 Ave No. 1 No. 2 No. 3 Ave No. 1 No. 2 No. 3 Ave
150 30 (H × 1/5) 111.3 102.9 107.1 90.7 95.1 92.9 97.2 104.5 102.1 101.3 73.3 72.2 66.8 70.8
50 (H × 1/3) 67.4 83.0 75.2 67.4 83.0 75.2 84.0 79.1 76.7 80.0 73.1 68.4 72.9 71.4
300 30 (H × 1/10) 149.3 183.2 166.3 133.1 131.6 132.4 186.3 160.0 169.8 172.0 123.7 117.2 125.6 122.2
60 (H × 1/5) 165.9 160.1 163.0 123.6 133.6 128.6 148.9 164.0 163.0 158.6 122.1 125.0 115.0 120.7
100 (H × 1/3) 140.6 158.4 149.5 121.8 119.1 120.4 135.2 145.8 152.6 144.6 122.1 115.1 121.1 119.4
450 30 (H × 1/15) 203.6 234.0 218.8 159.5 156.8 158.1 199.8 229.6 214.5 214.6 154.6 152.8 163.7 157.0
90 (H × 1/5) 203.4 215.6 209.5 151.3 137.7 144.5 245.6 253.2 207.5 235.4 160.6 180.7 156.1 165.8
150 (H × 1/3) 187.3 179.7 183.5 147.1 148.1 147.6 197.3 179.9 203.6 193.6 138.9 167.0 159.4 155.1
  1. Initial crack load is the 0.2 mm offset load, italic data—no crack