Page 348 - MORPHOLOGIE DES STRUCTURES

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348 LES PORTIQUES

20 L = H =10 20 L =10, H = 5
W h1 h2 W h1 h2

18 18

16 16 W+1H W+1H
W+1H W+1H W
W
kL kL
kL kL

14 14

12 12

10 10

∞ 10 10 4 2 k =1
86 4 ∞
8 2 k =1
7.5
8
7.5

Z =0.75 Z =0.75

6 8 2 k =1 6
10 6 4 2 k =1
∞ ∞
10 4 2 k = 1

4 10 Z =0.375 4 ∞ 10 2 k =1 Z =0.375
3.75 ∞ 8 64 Z =0.25 3.75 Z =0.25

2.5 2.5
2 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 2.3.3. Figure 2.3.4.

2.4. LE PORTIQUE II2

p2H 2 − p1L − p2H 2 − p1L − p2 H 2 − p1L p2H 2 p1
2L 2 2L 2 2L 2 2

p2H p2H p1 L 2 p2 H2 2
T 8 p1 L2
1+
Figure 2.4.2.
N p2H 2 p2 h1 , Ω1 , I1 p2 H
Rv, A h2 , Ω2 , I 2 MD
2
M L 2.4.1.
2.4.2.
nb = 3 ; nl = 5 ; nm = 3 ; nn = 4 ; nr = 5 : Dh = 0 . Rh, A Rh,D
Rv,D

Figure 2.4.1.

– si (L H )2 ≤ 1 k : W = H L + 4 (Z k ) (L h1 + H h2 + H h3 ) ( H L )2 + (1 k ) ( H L )3 ;
– si (L H )2 ≥ 1 k :

W = H L + Z[(L h1 ) (L H + (1 k ) H L )2 + (4 k ) H h2 + (4 k ) H h3 ]( H L )2 + (1 k ) ( H L )3 .

Lorsque p2 = 0 ( k = ∞ ) : W = Z L h1 + H L .
Pour L h1 = H h2 = H h3 = 10 :