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Official Journal of the Japan Wood Research Society

Table 1 Experimental data of GLT beams with round holes in Japan

From: Study on the strength of glued laminated timber beams with round holes: proposal of the design formula for the splitting strength

Test series

Tree species

Strength class

Density

B

H

D

D/H

M/(QH)

QIni

QMax

(kg/m3)

(mm)

(mm)

(mm)

(kN)

(kN)

OKAa [3]

Scots pine

E105-F300

–

105

150

30

0.20

2.33

40.3

53.5

39.7

57.5

36.8

56.1

50

0.33

2.33

40.2

46.2

37.6

43.5

40.1

42.2

300

30

0.10

2.33

68.0

102.4

69.1

93.4

60

0.20

2.33

67.1

81.9

68.7

90.2

63.2

89.7

100

0.33

2.33

67.1

74.4

63.3

80.2

66.6

83.9

450

90

0.20

2.33

88.3

135.1

99.4

139.2

85.9

114.1

150

0.33

2.33

76.4

108.5

91.8

99.0

87.7

112.0

750

250

0.33

2.33

109.0

139.4

98.2

120.1

87.1

124.3

OKAb [3]

Japanese larch

E105-F300

–

105

150

30

0.20

2.33

42.2

68.3

41.2

51.0

46.8

66.5

50

0.33

2.33

45.3

56.0

44.8

55.6

37.0

51.0

300

30

0.10

2.33

67.3

74.9

81.8

88.0

76.7

92.3

60

0.20

2.33

71.2

73.6

65.5

76.8

74.2

85.3

100

0.33

2.33

66.5

76.7

72.7

73.1

70.9

78.5

450

90

0.20

2.33

102.5

124.6

97.4

124.3

150

0.33

2.33

96.5

101.4

93.1

105.4

97.0

97.7

OKAc [4]

Scots pine

E105-F345

522 ± 11

105

150

30

0.20

2.33

49.9

61.2

52.3

56.6

50

0.33

2.33

37.1

37.1

45.6

45.6

300

30

0.10

2.33

73.2

82.1

72.4

100.8

60

0.20

2.33

68.0

91.2

73.5

88.0

100

0.33

2.33

67.0

77.3

65.5

87.1

450

90

0.20

2.33

83.2

111.8

75.8

118.6

150

0.33

2.33

80.9

103.0

81.4

98.8

KAR [6]

Douglas fir

E120-F330

–

120

300

100

0.33

0.67

–

54.9

1.66

–

53.1

2.67

–

52.1

3.67

–

50.8

4.16

–

39.7

4.67

–

52.4

HIJ [7]

Scots pine

E120-F330

–

120

330

65

0.20

0.91

58.4

97.0

70.6

106.1

64.2

101.4

130

0.39

0.91

53.2

93.4

45.7

82.9

63.6

101.5

165

0.50

0.91

51.8

76.0

38.4

68.8

50.9

83.3

  1. M is the bending moment at the center of the hole, Q is the shear force at the center of the hole, QIni. is the shear force at the center of the hole when the initial crack has propagated over the entire beam width, QMax. is the shear force at the center of the hole at failure, E105-F300 and E120-F330 are GLT beams composed of heterogeneous glue, and â– represents the yield strength evaluated by the elastic-perfectly plastic model