Final report for WP4.3: Enhancement of design methods ... - Upwind

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Table 5.28: Output locations for damage equivalent loads Jacket location Bladed identifier Load component Mbr 1 End 1 Axial force Fx Pile head Mbr 2 End 1 Mbr 3 End 1 Axial force Fx Axial force Fx Mbr 4 End 1 Axial force Fx Mbr 109 End 1 Axial force Fx Upper joint Mbr 110 End 1 Mbr 111 End 1 Axial force Fx Axial force Fx Mbr 112 End 1 Axial force Fx Tower base Mbr 134 End 1 Overturning bending moment Mz Figure 5.6: Output locations for damage equivalent loads Sources of loading For jacket structures it is generally assumed that wind loads dominate over hydrodynamic loads, due to the relative hydrodynamic transparency of jackets. In order to confirm this assumption, two additional fatigue load sets were performed, one with wind only and one with waves only, in order to investigate the relative influence of the different sources of loading. Figure 5.7 shows a sample time history of the axial force at one of the pile heads, during normal power production. Figure 5.8 presents normalized DELs at the chosen output locations on the jacket for the three different cases. 60
Tower Fx, Mbr 2 End 1 [kN] 1000 0 -1000 -2000 -3000 -4000 -5000 -6000 0 100 200 300 400 500 600 Time [s] 61 Wind and waves Wind only Waves only Figure 5.7: Sample time history of axial force at pile head Figure 5.8: Normalised DELs with variation in sources of loading
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Project UpWind Contract No.: 019945
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Acknowledgement The presented work
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Summary The overall aim of the UpWi
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Table of Contents Acknowledgement..
Page 10 and 11: Task 4.1 Integration of support str
Page 12 and 13: Sequential coupling The sequential
Page 14 and 15: analysis. In the new multibody code
Page 16 and 17: Figure 2.4: 2nd global bending mode
Page 18 and 19: 3.2 Comparison of deterministic loa
Page 20 and 21: Figure 3.5: Time series of axial fo
Page 22 and 23: • Time domain simulation in ADCoS
Page 24 and 25: • A supplementary load vector for
Page 26 and 27: The following results are found: Fi
Page 28 and 29: Figure 4.5: Output positions in the
Page 30 and 31: It is directly visible that there i
Page 32 and 33: ated eigenfrequency is shifted into
Page 34 and 35: Water levels For the calculation of
Page 36 and 37: guidelines for the inclusion of cli
Page 38 and 39: damaging if the frequency of the ex
Page 40 and 41: uncertain parameters carefully. Thr
Page 42 and 43: Table 5.3 shows annual reliability
Page 44 and 45: Steel substructure for offshore win
Page 46 and 47: Table 5.16 shows the required FDF v
Page 48 and 49: A Fracture Mechanical (FM) modellin
Page 50 and 51: Figure 5.4: Annual reliability indi
Page 52 and 53: Further, the effect of possible ins
Page 54 and 55: Rainflow evaluation The load cases
Page 56 and 57: For DLC 7.2 it has to be considered
Page 58 and 59: Guideline, DLC 1.5). Furthermore, t
Page 62 and 63: From these results it can be clearl
Page 64 and 65: Figure 5.11: Normalised DELs with v
Page 66 and 67: Figure 5.14 presents normalized DEL
Page 68 and 69: Figure 5.16: Output locations for e
Page 70 and 71: UPWIND WP4: Offshore Support Struct
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UPWIND WP4: Offshore Support Struct
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Final report for WP4.3: Enhancement of design methods ... - Upwind

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