Page 361 - MORPHOLOGIE DES STRUCTURES

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LES PORTIQUES 361

20 L = H = H =10 20 L =10 ; H = H = 5 W
W h1 h2 h3 W h1 h2 h3

18 W
18

16 16 L3
H3
1 3 L + 13 I1 + 5 I1 + 1 L3 1 3 L + 13 I1 + 5 I1 + 1
8 H3 W + H 2k H 4 I2 4 I3 8
W + H 2k H 4 I2 4 I3 L + I1 + I1
L L + I1 + I1 L H I2 I3

H I2 I3

14 14

12 k =1 1 L + 3 I1 + 11 I1 + 1 L3 12 1 L + 3 I1 + 11 I1 + 1 L3
W + H 2k H 4 I2 4 I3 8 H3 W + H 2k H 4 I2 4 I3 8 H3
10 10
2 L L + I1 + I1 k =1 L L + I1 + I1
8 H I2 I3 8 H I2 I3
7.5 7.5
6 4 6 2
86
4 10 4 10 86 4
3.75 3.75 ∞
∞
2.5 2.5
2 2 Z =0.75

0 k =1 Z =0.75 0
0 0
2 k =1

86 4 2
∞ 10
∞ 1086 4

∞ 10 8 6 4 2 k =1 Z =0.375 ∞ 10 8 6 4 2 k =1 Z =0.375
78 Z =0.25
Z =0.25
123456 L
L H
Figure 2.8.3. H 1 2 3 4 5 6 7 8 9 10
9 10
Figure 2.8.4.

12 L = H = H =10 12 L =10 ; H = H = 5
h1 h2 h3 h1 h2 h3
Ω1σ Ω1σ

p1L p1L

10 10

8 Z =0.75 8
∞
10 k =1 Z =0.75
8 64 2 k = 1 8642

6 10
6

∞

4 Z =0.375 4 Z =0.375
k =1 Z =0.25 k =1 Z =0.25

42 2
64
∞ 10 8

2 k =1 ∞
4 k =1
8 6
2
8 4
10 10 6

2∞ 2
∞

L L
H H

0 0
0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10

Figure 2.8.5. Figure 2.8.6.