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                                                                                 LES PORTIQUES                                                                                            441

70                                                   Z = 0.25 ; L = H =10     b 2.60                      70                                      Z = 0.25 ; L =10 ; H = 5        b 2.60
                                                                 h1 h2        H 2.40                                                                          h1 h2               H 2.40
      α                                                                                                         α
                                                                                        2.20                                                                                              2.20
65                                                                                                        65
60                                                                                   2                    60                                                                              2
55
50                                                                               10  1.80                                                                                             10  1.80
                                                                                 8                                                                                                  8     1.60
                                                                              6                                                                                                     6
                                                                                                                                                                                  4
                                                                              4                                                                                                     2

                                                                                 2 1.60                                                                                             k=1

                                                                                        1.40              55                                                                              1.40

                                                                              k=1

                                                                                     1.20 50                                                                                              1.20

45 1 45 1

40 40
                                                                                                                               0.80 0.80

35                                                        Hα               α                              35                                           Hα                      α

                                                          b L bL                                                                                                                                   L
                                                                                                  H 0.60                                                   bLb

                                                                                                                                                                                                  H 0.60

30 30

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

20                                Figure 2.24.17.                                                         20                                      Figure 2.24.18.
       W                                                                                                         W
                                             L = H =10                                                                                                      L =10; H = 5
                                             h1 h2                                                                                                          h1 h2

18 18

                                  Hα                          α                                                                       Hα                   α

16                                                                                                        16

                                                     bLb                                                                                               bL                   b

14                                                                                                        14

12 12

10 k=1                                                                                                    10

                                                  2                                                       8                                  k=1

                                  8 64                                                                                                 2
                                     10                                                                                   8 64

 8∞                                                                                                                         10
                                                                                                                       ∞

                                                                                     Z =0.75                                                                                              Z =0.75

6 k=1                                                                                                     6 k=1

          ∞                 2                                                                                       ∞              2
             8 64                                                                                                      8 64
             10
                                                                                                                       10

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

                               2                     k=1                             Z =0.375                                                                                             Z =0.375

                                                                                     Z =0.25                                                                                              Z =0.25

22

                                                                                     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 2.24.19.                                                                                                 Figure 2.24.20.
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