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172 LES TREILLIS

10 F F F 5 200
Wn(cn,2p) 4n 2n 2n 180
W
9 F β
8 4n F
7 2n
F
2 4,5

4 160

6 FF 3,5 140
2n 2n Wn(cn,2p),β ≤6 0° 120
n=18
n=16 β = 15° HOWE/PRATT
β = 22.5° barres sup, inf, diag
5 n=14 β = 30°
β = 45° 3 de section constante
n=12 β = 60°
n=10
2,5 ∆W (%) 100
4 n=8
Wn(,np2,β) ≤6 0°
n=6
HOWE/PRATT
3 n=4
barres de
n=2
2 section variable 80
2
1,5 60

1 Wn(cn2 ) − Wn(n 2 ) 40
Wn( n 2 )
100

Wn(cn,2p),β ≤6 0° 0,5 20
1 Wn(cn,2p),β ≤4 5°

LL

0 H H
03 0
0
10
Wn(cs,1P) 6 9 12 15 18 0 2 4 6 8 10 12 14 16 18

Figure 7.2.5.1. Figure 7.2.5.2.

10 200

W

9 9 180

n=18 8 160
n=16
7 140
8 n=14 Wn(cs,2P),β ≤6 0° 120

n=12 HOWE/PRATT
barres sup, inf, diag
7 n=10
6 de section constante
n=8
5 Wn(,sP2,)β ≤6 0° ∆W (%) 100
6 4
3 HOWE/PRATT 80
n=6 barres de 60
section variable
5

n=4

4

3 β = 15°
β = 22.5°
n=2 β = 30°
β = 45°
2 β = 60°

1 Wn(cs,1P), β≤60° F2 Wn(cs2) − Wn(s 2) 40
Wn(cs,1P),β ≤45° 1 Wn(s 2) 20
β 100

LL

0 H H
0 3 6 9 12 0
0
Figure 7.2.6.1.
15 18 0 2 4 6 8 10 12 14 16 18

Figure 7.2.6.2.