Grading Oak Structure 0809

Granville Bois sarl
Mob
+33 (0)6 18 00 61 54
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+44 (0)870 128 23 30 (UK)
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+33 (0)2 33 61 46 06 (France)
SARL au capital de 12000.00€
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Siège / Main Office :
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F-50800 Villedieu les Poêles - France
Wood & Structure
Oak Structural Grading
This specification is based on NF B 52 001 annex B (hardwood) dated 1947.
Considered dimensions of the beams are:
Width: 15 to 200mm
Height: 25 to 300mm
Length: up to 6m
OAK structural class
Class 1 / D35
Grain
Knots diameter
Shakes, splits
³ 7mm
£ 30mm
Local
general
Length
Height
Grain slope
Wanes
Black knot
Rot
Volume weight
Class 2 / D30
At 20% MC
³ 4mm
£ 40mm
Not considered
£ 10%
£ 20%
£ 7%
£ 12%
£ 1/3 beam length or 1m (min of two)
£ 1/3 side width
1 side maximum
Excluded
³ 800 kg/m³
³ 750 kg/m³
Note that there is no equivalence between QPx grading and class 1 & 2 in the sense of the
NF B 52 001 standard. However, we could consider that QP1 matches with D30 and QPA
with D35 class.
Parameters
sf
s
st
s‘
s ‘t
t
Ef
EG
r average at 15% mc
Grading oak Structure 0809
Unit
N/mm²
N/mm²
N/mm²
N/mm²
N/mm²
N/mm²
kN/mm²
D30
13,2
7,9
0,3
10,1
3,5
1,3
9,0
D35
15,4
9,2
0,3
11,0
3,7
1,5
9,5
D40
17,6
10,5
0,3
11,4
3,9
1,7
10,0
kN/mm² 0,55
Kg/m³
640
0,60
670
0,65
700