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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 3 Results obtained from modified load-slip curves of the bolted joint and the combined joint

From: Effective lateral resistance of combined timber joints with nails and bolts

t (mm)

K (kN/mm)

U (kN mm)

P max (kN)

δ P (mm)

P y (kN)

δ y (mm)

P u (kN)

μ

0.2P u (2μ − 1)0.5 (kN)

2/3P max (kN)

P a (kN)

Bolted joints (C = 4 mm)

 60

3.0

187

21.8

11.5

47.4b (14.3)

6.48

16.7

2.53

6.7 (4.2)

14.5 (7.2)

4.2

 90

2.9

409

34.8

17.8

19.0 (13.6)

6.60

28.0

2.03

9.7 (7.4)

23.2 (14.3)

7.4

 120

2.9

644

40.7

23.4

22.1 (18.7)

7.74

31.6

2.32

12.1 (9.3)

27.1 (24.6)

9.3

Combined joints (C = 0 mm)

 60

25.6

392

43.4

6.8

25.3 (18.5)

1.00

41.3

6.61

28.2 (21.4)

28.9 (21.0)

18.5

 90

18.8

674

51.7

11.6

30.0 (19.9)

1.66

48.0

6.12

31.6 (25.1)

34.5 (24.7)

19.9

 120

14.6

962

54.3

14.8

33.1 (23.2)

2.30

49.9

6.23

33.4 (25.3)

36.2 (30.5)

23.2

Combined joints (C = 4 mm)

 60

8.9

442

42.9

8.3

5.5a (−24.2a)

2.12

41.0

3.20

17.5 (10.8)

28.6 (21.3)

−24.2a

 90

5.3

710

48.5

14.4

172b (−769a)

6.45

50.6b

2.07

17.4 (15.2)

32.3 (23.0)

−769a

 120

4.9

990

50.9

18.9

−177a (−1231a)

6.94

49.9

2.72

20.5 (16.9)

33.9 (28.5)

−1231a

  1. Parentheses denote 95% lower limit value
  2. C total clearance between lead-hole and bolt, t main member thickness, K initial stiffness, U energy capacity, P max maximum load, δ P slip at P max, P y yield load, δy slip at P y, P u ultimate load, μ ratio of δ u to δ v as shown in Fig. 4, P a short-term allowable resistance
  3. aValue too low or negative value
  4. bValue higher than P max
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