Page 170 - MORPHOLOGIE DES STRUCTURES
P. 170
www.academieroyale.be
170 LES TREILLIS
10 3F F 5 200
Wn(cs,1p) 2n n 180
W
9 β
F
n
4,5
8 4 160
F β = 15° 3,5 140
2 β = 22.5° Wn(cs,1p) ,β ≤6 0°
β = 30° 120
7 β = 45° HOWE/PRATT
β = 60°
6 3 barres sup, inf, diag
de section constante W (s1) ≤6 0° ∆W (%) 100
n=18 n,p ,β
n=16 2,5 80
HOWE/PRATT
5 n=14 2 barres de
section variable
n=12 1,5
n=10 60
4 n=8 1 40
n=6 W (s 1 ) β ≤6 0 °
n c, p ,
3 n=4
Wn(cs1) − Wn( s1)
n=2 Wn( s1)
100
2
0,5 20
Wn(cs,1p),β ≤4 5°
1
LL
0 H H
0 3 6 9 12 0
0
15 18 0 2 4 6 8 10 12 14 16 18
Figure 7.2.1.1. Figure 7.2.1.2.
10 F FF 5 200
Wn(cs,2p) 2n nn 180
W
9
F
n
4,5
β
8 4 160
F β = 15° 3,5 140
2 β = 22.5° Wn(cs,2p),β ≤6 0°
β = 30°
7 β = 45° HOWE/PRATT
β = 60°
6 3 barres sup, inf, diag
de section constante 120
n=18
n=16 2,5 ∆W (%) 100
5 n=14 2 Wn(,sp2,)β ≤60° 80
n=12 1,5 HOWE/PRATT
n=10 barres de
section variable
4 n=8
60
n=6
1 100Wn(cs2W) n−(s2W) n(s2) 40
3 n=4
n=2
2
Wn(cs,2p),β ≤60° 0,5 20
1 Wn(cs,2p),β ≤45°
0 L L
0 3 6 9 12
H H
Figure 7.2.2.1. 0
0
15 18 0 2 4 6 8 10 12 14 16 18
Figure 7.2.2.2.