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LES TREILLIS 173

10 n=18 10 200
Wn(cs,2P) n=16 180
n=14 W
9
9

n=12 8 160

8

n=10

n=8 7 140
Wn(cs,2P),β ≤6 0° 120
7
HOWE/PRATT
n=6 barres sup, inf, diag

n=4 6 de section constante

6

n=2

5 5 ∆W (%) 100
4
4 3 Wn(,sP2,)β ≤6 0° 80
Wn(cs,2P),β ≤6 0° 60
HOWE/PRATT
3 Wn(cs,2P),β ≤4 5° barres de
section variable
2
β = 15°
β β = 22.5°
β = 30°
1 β = 45°
β = 60°

F2 Wn(cs 2) − Wn(s 2) 40
1 Wn( s 2 ) 20
100

LL

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

Figure 7.2.7.1. Figure 7.2.7.2.

10 200

W

9 9 180

n=18 8 160
n=16
7 140
8 n=14 120
Wn(ic,)P,β ≤6 0°
n=12 6 HOWE/PRATT

7 n=10 barres sup, inf, diag
de section constante
n=8

6 n=6

5 n=4 β = 15° 5 Wn(,iP) , β ≤6 0° ∆W (%) 100
β = 22.5° 4
4 β = 30° 3 HOWE/PRATT 80
β = 45° 2 barres de 60
n=2 β = 60° section variable 40

3 Wn(ic,)P ,β ≤6 0° 100Wn(ci) − Wn(i)
Wn(i)
2
Wn(ic,)P,β ≤4 5° β

1 1 20
R1 F
L
L

0 H0 H
0

0 3 6 9 12 15 18 0 2 4 6 8 10 12 14 16 18

Figure 7.2.8.1. Figure 7.2.8.2.