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LES TREILLIS 171
10 5 200
Wn(ci,)p 180
W
9
4,5
8
F β 4 160
7 2n
FF
6 F nn
2
β = 15°
β = 22.5° 3,5 140
β = 30°
β = 45° Wn(ci,)p,β ≤6 0°
β = 60°
3 HOWE/PRATT
barres sup, inf, diag 120
de section constante
5 2,5 ∆W (%) 100
n=18 W (i ) , β ≤6 0° 80
n=16 60
n=14 2 n, p
4 n=12 HOWE/PRATT
barres de
n=10 section variable
n=8 1,5
3 n=6 1 40
n=4
n=2
2
Wn(ci,)p,β ≤6 0° 0,5 100 Wn(ci) − Wn(i) 20
1 Wn(i)
Wn(ci,)p,β ≤4 5°
0 L L
0 3 6 9 12 H
H
0 0
15 18 0 2 4 6 8 10 12 14 16 18
Figure 7.2.3.1. Figure 7.2.3.2.
10 3F F 5 200
Wn(cn,1p) 4n 2n 180
W
9 β
F
8 2n
7 4,5
F 4 160
4n
FF
F 2n 2n
2
β = 15°
β = 22.5° 3,5 140
β = 30°
β = 45° Wn(cn,1p),β ≤6 0°
β = 60°
HOWE/PRATT
6 3 barres sup, inf, diag 120
de section constante
n=18
n=16 2,5 ∆W (%) 100
5 n=14 2 Wn(,np1,)β ≤6 0° 80
n=12 HOWE/PRATT
barres de
n=10 section variable
4 n=8
n=6
3 n=4 1,5 60
n=2 1 40
2
Wn(nc,1p),β ≤6 0° 0,5 1 00 Wn(nc1) − Wn(n1) 20
1 Wn(cn,1p),β ≤4 5° Wn(n1)
0 L L
0 3 6 9 12 H
H
Figure 7.2.4.1. 0 0
15 18 0 2 4 6 8 10 12 14 16 18
Figure 7.2.4.2.
