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426 LES PORTIQUES
50 L = H =10 b 50 L =10 ; H = 5 b
h1 h2 H 1.10 h1 h2 H 1.10
α α
Hα α 1 Hα α 1
40 Z =0.25
Z =0.25 0.90 40 0.90
Z =0.375 0.83 0.83
Z =0.375
Z =0.75 0.80 0.80
30 bLb b Lb
0.70
20 0.70 Z =0.75
k=1 0.60
0.60 30
2
k=1
0.50
2 0.50
4
4 20
6 0.40
0.40
8
6 10
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 2.22.13. Figure 2.22.14.