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                                         LES PORTIQUES                                                                                                                                                                              413

70                   L = H = 10                     0.70                                                          70                                      L =10; H = 5                    0.70
                     h1 h2                 b                                                                                                              h1 h2                  b
      α                                    H 0.65                                                                       α                                                        H 0.65
                                                                                                                                                          Hα            α
60                                                  0.60                                                          60                                                                      0.60
                                         0.57                                                                                                                                  0.57
50               Hα  α
       Z =0.25                                      0.55                                                                                                                                  0.55
       Z =0.375
                 bLb                                0.50                                                                                                  bL b                            0.50
40                                                                                                                                                                             0.46
       Z =0.75                           0.46                                                                     50 Z =0.25
                                                    0.45                                                                 Z =0.375                                                         0.45

                                                    0.40                                                                 Z =0.75                                                          0.40
                                                                                                                  40
                                         0.36                                                                                                                                  0.36
                                                    0.35                                                                                                                                  0.35

                                                                                                                               0.30 0.30

30 0.26 30 0.26
                                                                                                                               0.25 0.25

                                                                                                                  0.20 0.20

20 20

                                                  0.15                                                                                                                         k=1 0.15

                                         k=1

                                                                                                                        2 0.10                                                  2

10 10                                                                                                                                                                                 0.10

                                                                                                                                                       4                        4
                                                                                                                                                      6                         6
                                                                                                                                                                                8
                                                                                                                        8 0.05
                                                                                                                                                                               10 0.05
                                                                                                                                                      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

70               Figure 2.20.11.                  0.70                                                            70                                      Figure 2.20.12.               0.70
                                         b                                                                                                                                     b
      α                      L = H = 10                                                                                 α                                        L =10; H = 5
                             h1 h2       H 0.65                                                                                                                  h1 h2         H 0.65

60               Hα  α                              0.60                                                          60 Z =0.25                              Hα            α                 0.60
                                         0.57                                                                            Z =0.375                                              0.57
       Z =0.25
       Z =0.375                                     0.55                                                                                                                                  0.55
50
                 bLb                                0.50                                                                                                  bLb                             0.50
                                                                                                                                                                               0.46
                                         0.46                                                                     50
                                                    0.45                                                                 Z =0.75                                                          0.45

40                                                  0.40                                                          40                                                                      0.40
       Z =0.75
                                         0.36                                                                                                                                  0.36
                                                    0.35                                                                                                                                  0.35

                                                                                                                               0.30 0.30

30 0.26 30 0.26
                                                                                                                               0.25 0.25

                                                                                                                  0.20 0.20

20 20

                                                                                                                  0.15 k=1 0.15

                                         k=1

                                                                                                                       2 0.10                                                  2

10 10                                                                                                                                                                                 0.10
                                                                                                                                                      4
                                                                                                                                                      6                         4
                                                                                                                        8 0.05                                                  6
                                                                                                                                                      10
                                                                                                                                                                                8

                                                                                                                                                                               10 0.05

                                                                                                               L                                                                                                                 L
                                                                                                              H
0 k =∞                                                                                                                                                                                                                          H
   0 1 2 3 4 5 6 7 8 9 10                                                                                         0 k =∞

                                                                                                                     0 1 2 3 4 5 6 7 8 9 10

                 Figure 2.20.13.                                                                                                                          Figure 2.20.14.
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