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Official Journal of the Japan Wood Research Society

Table 2 Experimental data of GLT beams with round holes from outside Japan [14]

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)

BEN [8]

Spruce

L40

-

90

500

250

0.50

1.20

–

37.5

–

39.2

PEN [9]

-

L40

458 ± 36

90

500

255

0.51

1.20

–

33.8

250

0.50

2.10

–

31.6

150

0.30

1.20

–

51.3

115

800

300

0.38

2.00

–

89.5

JOH [10]

Spruce

L40

–

90

500

250

0.50

1.30

25.7

39.5

1.30

33.4

33.4

2.80

35.0

35.0

2.80

31.3

39.9

0.60

28.8

44.6

0.60

38.8

38.8

88

495

125

0.25

2.53

46.9

–

56.4

–

55.2

–

49.2

–

HAL [11]

Spruce

–

350—550

90

315

150

0.48

2.78

24.5

–

HOF [12]

Spruce

GL32h

489

120

450

90

0.20

1.50

85.5

85.5

77.0

91.1

51.0

74.6

53.5

85.4

50.2

73.8

120

450

135

0.30

1.50

52.5

59.3

75.0

75.0

69.4

77.2

62.6

62.6

66.7

66.7

66.5

66.5

120

450

180

0.40

1.50

38.9

44.5

45.0

53.4

48.3

50.6

58.7

58.7

120

900

180

0.20

1.50

88.0

119.2

86.1

110.0

90.0

114.2

117.0

144.8

150.7

152.5

120

900

270

0.30

1.50

96.0

115.8

112.0

116.0

90.5

110.9

81.0

102.6

90.9

104.9

108.2

112.1

120

900

360

0.40

1.50

–

81.9

67.5

72.4

84.0

117.3

60.0

85.4

69.0

79.3

65.3

88.8

120

450

135

0.30

5.00

58.5

58.5

70.0

70.0

52.4

68.1

54.8

54.8

54.1

65.6

120

900

270

0.30

5.00

48.0

95.6

50.9

74.1

50.0

93.8

69.2

100.1

57.5

57.5

AIC [13]

Spruce

GL 32 h

471 ± 38

120

450

180

0.40

5.00

50.0

61.0

63.5

63.5

43.8

44.0

46.7

48.0

46.7

57.5

42.0

48.0

120

900

180

0.20

5.00

107.1

107.1

101.4

101.4

126.4

126.4

90.6

–

120

900

360

0.40

5.00

62.6

82.7

77.2

77.2

68.5

82.7

62.5

–

37.0

77.0

  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, and â–  represents the average value of 5 test specimens