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178 LES TREILLIS

10 10 200
Wn(cs,2P)
W

9 n=18 9 180

n=16 8 160

8 n=14 7 140

n=12 Wn(cs,2P),α ≤90° 120
n=10 6

7 W (s2) ≤1 2 0°
n c,P ,α
n=8
WARREN ∆W (%) 100
6 n=6
barres sup, inf, diag 80
n=4 60
5 de section constante
5
Wn(cs,2P),α≤1 20° 4 Wn(,sP2,α) ≤9 0°
n=2
Wn(,sP2,α) ≤12 0°
4 WARREN
barres de
α=30° section variable
α=45°
3 Wn(cs,2P),α ≤9 0° α=60° 3
α=90°
α=120°
F

2 2 40

1 α 1 100 Wn(cs2) − Wn(s2) 100 Wn(cs2 ) − Wn(s2 ) 20
Wn(s 2 ) Wn( s 2 ) 0
0 R1 L α ≤90 ° α ≤1 2 0°
03 6 9 12 H
L
10 Figure 7.3.7.1. 0
Wn(ci,)P H

15 18 0 2 4 6 8 10 12 14 16 18

Figure 7.3.7.2.

10 200

W

9 9 180

n=18 8 160
8
7 140
n=16
6 120
n=14
7 W (i ) ,α ≤9 0°

n=12 nc, P

n=10 5 ∆W (%) 100
6 Wn(ci,)P,α ≤1 2 0°
Wn(,iP) ,α ≤9 0° 80
n=8 WARREN 60
barres sup, inf, diag Wn(,iP) ,α ≤1 2 0°
5 n=6
4 de section constante WARREN
n=4 barres de
4 section variable

3 α=30° 3
n=2 α=45°
Wn(ci,)P,α ≤1 20° α=60°
2 α=90°
α=120° 2 40
1
Wn(ci,)P,α ≤90°
0
03 α 100 Wn(ci) − Wn(i) Wn(ic) − Wn(i )
Wn(i ) Wn(i )
1 α ≤9 0 ° 100 20

α ≤1 2 0° L
H
R1 F L 0
15 H 024 0
6 9 12
18 6 8 10 12 14 16 18
Figure 7.3.8.1.
Figure 7.3.8.2.