SR-EN 338 “Lemn pentru constructii. Clase de rezistenta”
Răș inoase C14
C16
C18
C22
C24
C27
C30
C35
C40
[N/mm2] f m,k m,k
14
16
18
22
24
27
30
35
40
f t,0,k t,0,k
8
10
11
13
14
16
18
21
24
f t,90,k t,90,k
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.4
f c,0,k c,0,k
16
17
18
20
21
22
23
25
26
f c,90,k c,90,k
4.3
4.6
4.8
5.1
5.3
5.6
5.7
6.0
6.3
f v,k v,k
1.7
1.8
2.0
2.4
2.5
2.8
3.0
3.4
3.8
2
[kN/mm ] E0,mean
7
8
9
10
11
12
12
13
14
E0,05
4.7
5.4
6.0
6.7
7.4
8.0
8.0
8.7
9.4
E90,mean
0.23
0.27
0.30
0.33
0.37
0.40
0.40
0.43
0.47
Gmean
0.44
0.50
0.56
0.63
0.69
0.75
0.75
0.81
0.88
370
380
400
420
[kg/m3] 290
k
310
320
340
350
D35
D40
D50
D60
Foioase D30
D70
[N/mm2]
m = încovoiere; t = întindere;
f m,k m,k
30
35
40
50
60
70
c = compresiune;
f t,0,k t,0,k
18
21
24
30
36
42
v = forfecare;
f t,90,k t,90,k
0.6
0.6
0.6
0.6
0.7
0.9
f = rezistență
f c,0,k c,0,k
23
25
26
29
32
34
k = cara caracte cteris ristic tică;
f c,90,k c,90,k
8.0
8.4
8.8
9.7
10.5
13.5
0 = paralel cu fibrele;
f v,k v,k
3.0
3.4
3.8
4.6
5.3
6.0
90 = perpendicular pe
[kN/mm2]
fibre.
E0,mean
10
10
11
14
17
20
E0,05
8.0
8.7
9.4
11.8
14.3
16.8
E90,mean
0.64
0.69
0.75
0.93
1.13
1.33
Gmean
0.60
0.65
0.70
0.88
1.06
1.25
650
700
900
[kg/m3] ρk
530
560
590
