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Appendix to report:

SBJ-33-C5-OON-22-RE-012

STRUCTURAL RESPONSE ANALYSES

Appendix title:

APPENDIX B – MODAL ANALYSIS

Contract no: 18/91094 Project number: 5187772/12777

Document number: SBJ-33-C5-OON-22-RE-012 App. B

Date: 15.08.2019

Revision: 0

Number of pages: 212

Prepared by: Vegard Kristensen Controlled by: Tor Martin Lystad Approved by: Kolbjørn Høyland

HEYERDAHL ARKITEKTER AS

CONCEPT DEVELOPMENT FLOATING BRIDGE E39 BJØRNAFJORDEN

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

Table of Content

1 INTRODUCTION ... 3

2 MODAL ANALYSIS ... 4

2.1 Summary of results ... 4

2.2 Mode shapes ... 11

3 REFERENCES ... 212

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

1 INTRODUCTION 3

Eigen periods and Eigen modes of the floating bridge is calculated with frequency-dependent added mass on the pontoons. A python script is developed which uses built-in routines based on ARPACK [1] to solve the eigenvalue problem. The script was verified against the

Eigenvalue solver in Sofistik [2] in phase 3 of the Bjørnafjorden project [3], for the bridge without added mass on the pontoons. The program performs an iteration loop to account for the frequency-dependent added mass to get a correct picture of the behavior of the floating bridge. The first 50 modes are reported.

Results from the Eigen value problem shows that added mass has a significant effect on the

Eigen periods of the structure. Especially for Eigen periods in between 5 and 10s. The slope

of the added mass curve is very steep in this area.

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

4 2 MODAL ANALYSIS

2.1 Summary of results

The first 100 Eigen periods with frequency dependent added mass included is found on olavolsen.interactive.no [4] for K12 – Model 27 and in Table 2-1.

> Table 2-1 Eigen periods with added mass

Mode Frequency [Hz] Period [s] Mode Frequency [Hz] Period [s]

1 0.0179 55.9 51 0.2239 4.47

2 0.0204 48.97 52 0.2313 4.32

3 0.0316 31.68 53 0.232 4.31

4 0.0474 21.09 54 0.2361 4.24

5 0.0633 15.81 55 0.2396 4.17

6 0.0772 12.96 56 0.2461 4.06

7 0.0875 11.43 57 0.2499 4

8 0.1035 9.66 58 0.2522 3.96

9 0.1141 8.76 59 0.2549 3.92

10 0.1276 7.84 60 0.2622 3.81

11 0.1358 7.36 61 0.2662 3.76

12 0.1445 6.92 62 0.2671 3.74

13 0.1456 6.87 63 0.2752 3.63

14 0.1486 6.73 64 0.2794 3.58

15 0.151 6.62 65 0.2833 3.53

16 0.1521 6.57 66 0.2846 3.51

17 0.1533 6.52 67 0.2904 3.44

18 0.1565 6.39 68 0.2916 3.43

19 0.1569 6.37 69 0.2944 3.4

20 0.1589 6.29 70 0.2996 3.34

21 0.1592 6.28 71 0.3014 3.32

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

Mode Frequency [Hz] Period [s] Mode Frequency [Hz] Period [s] 5

22 0.1612 6.2 72 0.3029 3.3

23 0.1613 6.2 73 0.3068 3.26

24 0.1613 6.2 74 0.3165 3.16

25 0.1613 6.2 75 0.3258 3.07

26 0.1615 6.19 76 0.3366 2.97

27 0.1617 6.19 77 0.3461 2.89

28 0.1624 6.16 78 0.3477 2.88

29 0.1631 6.13 79 0.3524 2.84

30 0.1643 6.09 80 0.3597 2.78

31 0.1658 6.03 81 0.3647 2.74

32 0.1676 5.97 82 0.3808 2.63

33 0.1679 5.96 83 0.3838 2.61

34 0.1701 5.88 84 0.3968 2.52

35 0.1728 5.79 85 0.4007 2.5

36 0.1748 5.72 86 0.4101 2.44

37 0.176 5.68 87 0.4178 2.39

38 0.1791 5.58 88 0.4241 2.36

39 0.1828 5.47 89 0.4408 2.27

40 0.1832 5.46 90 0.4455 2.24

41 0.1877 5.33 91 0.4483 2.23

42 0.1921 5.21 92 0.453 2.21

43 0.1963 5.09 93 0.4547 2.2

44 0.1974 5.07 94 0.4795 2.09

45 0.2007 4.98 95 0.48 2.08

46 0.2038 4.91 96 0.4951 2.02

47 0.2099 4.76 97 0.4976 2.01

48 0.2111 4.74 98 0.5028 1.99

49 0.2168 4.61 99 0.5073 1.97

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

6 Mode Frequency [Hz] Period [s] Mode Frequency [Hz] Period [s]

50 0.2211 4.52 100 0.5078 1.97

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

2.1.1 Horizontal modes 7

The first eleven modes are horizontal Eigen modes. See mode number 5 in Figure 2-1 located at a period of 15.81s.

> Figure 2-1 Fifth horizontal Eigen mode

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

8 2.1.2 Vertical modes

Pendulum modes and vertical modes around the mooring system can be located in between 6.9 seconds and 6.3 seconds. However the first global vertical mode can be found at a period of 6.2 seconds. See mode number 22 in Figure 2-2.

> Figure 2-2 Global vertical mode

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

9

2.1.3 Torsional modes

Many modes have torsional contributions. One of the first mode with a significant torsional contribution is seen at mode number 11 located at a period of 7.36s. See Figure 2-3.

> Figure 2-3 Torsional mode

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

10 2.1.4 Pendulum modes on high bridge

The first pendulum mode is located at 6.92s. See Figure 2-4. These are modes that trigger high response in the highest part of the floating bridge about the weak axis of the bridge girder.

> Figure 2-4 First pendulum mode

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APPENDIX B – MODAL ANALYSIS SBJ-33-C5-OON-22-RE-012, rev. 0

2.1.5 Tower modes 11

The tower starts to participate already in the first pendulum modes but becomes more active in the vertical modes from about mode number 27 located at a period of 6.2s. See mode 30 in Figure 2-5.

> Figure 2-5 Mode including tower response

2.2 Mode shapes

Mode shapes for the first 50 Eigen periods with added mass included are currently found on

the website olavolsen.interactive.no for K12 – Model 27 [4] and also displayed below.

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