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4. STRUCTURAL DESIGN OF LVL STRUCTURES
Table 4.6.
Strength classes for structural LVL-C with crossband veneers
15
.
LVL 04, Table 4.6
Strenght class
Property
a
Symbol
Unit
LVL 22 C LVL 25 C LVL 32 C LVL 36 C LVL 70 C LVL 75 C
Bending
strength
Edgewise, parallel to grain
(depth 300 mm)
f
m,0,edge,k
N/mm²
19
20
28
32
54
60
Flatwise, parallel to grain
f
m,0,flat,k
N/mm²
22
25
32
36
70
75
Size effect parameter
s
-
0,15
0,15
0,15
0,15
0,15
0,15
Flatwise, perpendicular to grain
f
m,90,flat,k
N/mm²
MDV
c
MDV
c
7
8
32
20
Tension
strength
Parallel to grain
(length 3 000 mm)
f
t,0,k
N/mm²
14
15
18
22
45
51
Perpendicular to grain,
edgewise
f
t,90,edge,k
N/mm²
4
4
5
5
16
8
Compression
strength
Parallel to grain for service
class 1
f
c,0,k
N/mm²
18
18
18
26
54
64
For service class 2 according to
EN 1995-1-1
b
15
15
15
21
45
53
Perpendicular to grain,
edgewise
f
c,90,edge,k
N/mm²
8
8
9
9
45
23
Perpendicular to grain,
flatwise (except pine)
f
c,90,flat,k
N/mm²
1,0
1,0
2,2
2,2
16
16
Perpendicular to grain,
flatwise, pine
f
c,90,flat,k,pine
N/mm²
MDV
c
MDV
c
3,5
3,5
–
d
–
d
Shear
strength
Edgewise parallel to grain
f
v,0,edge,k
N/mm²
3,6
3,6
4,5
4,5
7,8
7,8
Flatwise, parallel to grain
f
v,0,flat,k
N/mm²
1,1
1,1
1,3
1,3
3,8
3,8
Flatwise, perpendicular to grain
f
v,90,flat,k
N/mm²
MDV
c
MDV
c
0,6
0,6
MDV
c
MDV
c
Modulus of
elasticity
Parallel to grain, edgewise
E
0,edge,mean
e
N/mm²
6 700
7 200
10 000 10 500 11 800
13200
Parallel to grain, edgewise
E
0,edge,k
f
N/mm²
5 500
6 000
8 300
8 800
10 900
12200
Perpendicular to grain, edgewise
E
90,edge,mean
g
N/mm²
MDV
c
MDV
c
2 400
2 400
MDV
c
MDV
c
Perpendicular to grain, edgewise
E
90,edge,k
h
N/mm²
MDV
c
MDV
c
2 000
2 000
MDV
c
MDV
c
Perpendicular to grain, flatwise
E
m,90,flat,mean
N/mm²
MDV
c
MDV
c
1 200
2 000
MDV
c
MDV
c
Perpendicular to grain, flatwise
E
m,90,flat,k
N/mm²
MDV
c
MDV
c
1 000
1 700
MDV
c
MDV
c
Shear
modulus
Edgewise, parallel to grain
G
0,edge,mean
N/mm²
500
i
500
i
600
600
820
820
Edgewise, parallel to grain
G
0,edge,k
N/mm²
300
i
300
i
400
400
660
660
Flatwise, parallel to grain
G
0,flat,mean
N/mm²
70
i
70
i
80
120
430
430
Flatwise, parallel to grain
G
0,flat,k
N/mm²
55
i
55
i
60
100
380
380
Flatwise, perpendicular to grain
G
90,flat,mean
N/mm²
MDV
c
MDV
c
22
22
MDV
c
MDV
c
Flatwise, perpendicular to grain
G
90,flat,k
N/mm²
MDV
c
MDV
c
16
16
MDV
c
MDV
c
Density
ρ
mean
kg/m³
440
440
510
510
800
800
ρ
k
kg/m³
410
410
480
480
730
730
a
Additional strength, stiffness and density properties not covered by the classes may be declared as individual values
b
Value may also be applied in Service Class 1 as a conservative value
c
Property is not expressed as strength class but rather as individual manufacturer´s declared value (MDV)
d
Class not produced from pine
e
Covering
E
m,0,edge,mean,
E
t,0,mean,
E
m,0,flat,mean,
and
E
c,0,mean
f
Covering
E
m,0,edge,k,
E
t,0,k,
E
m,0,flat,k,
and
E
c,0,k
g
Covering
E
m,90,edge,mean,
E
t,90,edge,mean
and E
c,90,edge,mean
h
Covering
E
m,90,edge,k,
E
t,90,edge,k
and E
c,90,edge,k
i
Property need not be tested if all other properties meet the minimum values for the strength class
LVL Handbook Europe
119