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LES PORTIQUES 425
50 L = H =10 b 50 L =10 ; H = 5 b
h1 h2 H 1.10 h1 h2 H 1.10
α α
1 1
40
Z =0.25 Hα α 0.90 Hα α 0.90
Z =0.375 0.83 0.83
bL b 40 b Lb
30 0.80 0.80
Z =0.75 Z =0.25
0.70 Z =0.375 0.70
20
0.60 Z =0.75 0.60
0.57 30
k=1
k=1
2 0.50
0.50
4
2
0.40
4 20
6
0.40 8
10
6
8 0.30
10
0.30
0.20 0.20
10 0.17 10 0.17
0.10 0.10
L L
H H
0 k =∞ 0 k =∞
0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10
Figure 2.22.9. Figure 2.22.10.
20 L = H =10 20 L =10; H = 5
W h1 h2 W h1 h2
18 18
Hα α Hα α
16 16
b Lb bL b
14 14
12 12
k=1 k=1
2 2
864
10 10 10
∞
8 8 4
7.5 6
6 10
4 ∞ 8
3.75 7.5
Z =0.75 Z =0.75
2.5 6
2 k=1 k=1 Z =0.375
Z =0.25
2
2
84 8 64
6 10
10 ∞
∞
∞ 10 8 6 4 2 k=1 Z =0.375 4 ∞ 10 8 6 4 2 k=1
Z =0.25 3.75
2.5
2
LL
HH
00
0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10
Figure 2.22.11. Figure 2.22.12.
