ABS-104-2005.pdf
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1、 GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES MARCH 2005 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2005 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Copyright Amer
2、ican Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under li
3、cense with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES . 2005 iii Foreword These Guidance Notes provide additiona
4、l information and suggestions about particular aspects of the ABS Classification criteria. The present Guidance Notes serve to illustrate an envisioned scope and method to perform spectral fatigue analysis for various types of floating offshore structures. The Rules and Guides for Classification to
5、which these Guidance Notes are considered to be most relevant are: ABS Rules for Building and Classing Mobile Offshore Drilling Units ABS Guide for Building and Classing Offshore Installations ABS Guide for Building and Classing Floating Production Installations Additionally, the use of these Guidan
6、ce Notes relies on reference to: ABS Guide for the Fatigue Assessment of Offshore Structures These Guidance Notes specifically relate to the latest editions of the above-mentioned Rules and Guides. The use and relevancy of these Guidance Notes to other editions of these references, or with other ABS
7、 criteria, should be established in consultation with ABS. These Guidance Notes are based on an earlier publication entitled: ABS Guidance Notes on Spectral-Based Fatigue Analysis for Floating Production, Storage and Offloading (FPSO) Systems (January 2002) The present document supersedes the earlie
8、r one. ABS welcomes comments and suggestions for the improvement of these Guidance Notes. Comments or suggestions can be sent electronically to rddeagle.org. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46
9、 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted with
10、out license from IHS -,-,- ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES . 2005 1 GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES CONTENTS SECTION 1 Introduction5 1 Background and Applicability.5 3 FPSO Areas for Fatigue Ass
11、essment6 3.1 Hull Structure 6 3.3 FPSO-Specific Structural Areas7 5 Tanker Conversion.7 7 General Comments about the Spectral-based Method.7 FIGURE 1 Schematic Spectral-based Fatigue Analysis Procedure.9 SECTION 2 Establishing Fatigue Demand.11 1 Introduction11 3 Stress Transfer Function .11 5 Base
12、Vessel Loading Conditions.11 7 Combined Fatigue from Multiple Base Vessel Loading Conditions12 9 Transit Cases.12 SECTION 3 Environmental Conditions 13 1 General 13 3 Waves13 3.1 Wave Spectra (Short-term Wave Statistics)13 3.3 Wave Scatter Diagram and Rosette (Long-term Wave Statistics) 14 5 Current
13、s .15 7 Wind.15 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATIN
14、G OFFSHORE STRUCTURES. 2005 SECTION 4 Motion Analysis and Wave-induced Loads.17 1 General 17 3 Still-water Loads 17 5 Essential Features of Motion and Wave Load.18 5.1 General Modeling Considerations .18 5.3 Diffraction-Radiation Methods.18 5.5 Low Frequency Motions 18 SECTION 5 Wave-induced Load Co
15、mponents21 1 General 21 3 External Pressure Component.21 3.1 Total Hydrodynamic Pressures .21 3.3 Intermittent Wetting .21 5 Internal Tank Pressure Component.22 7 Loads from the Motions of Discrete Masses22 SECTION 6 Loading for Global Finite Element Method (FEM) Structural Analysis Model.23 1 Gener
16、al 23 3 Number of Load Cases23 5 Mooring Loads .23 7 Equilibrium Check24 SECTION 7 Structural Modeling and Analysis25 1 General 25 3 Areas for Fatigue Strength Evaluations.25 5 3-D Global Analysis Modeling25 7 Analyses of Local Structure.26 9 Hot Spot Stress Concentration 26 FIGURE 1 Fine Mesh FEM M
17、odel.27 FIGURE 2 Local Structural FE Model: Welds modeled.27 FIGURE 3 Weld Toe Extrapolation Points.29 FIGURE 4 Elements Adjacent to Weld Toe.29 SECTION 8 Fatigue Strength 31 1 General 31 3 S-N Data 31 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/59
18、10770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES . 2005 3 SECTION 9 Fatigue Life (Damage) Calculation and Acceptance Criteria.33 1 General 33 3
19、 Combination of Wave-Frequency and Low-Frequency Responses.33 5 Fatigue Damage due to Loading/Offloading of Produced Fluids .34 7 Acceptance Criteria35 APPENDIX 1 Outline of a Closed Form Spectral-based Fatigue Analysis Procedure37 1 General 37 3 Key Steps in Closed Form Damage Calculation .37 5 Clo
20、sed Form Damage Expression.40 FIGURE 1 Spreading Angles Definition38 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Inte
21、ntionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:43:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOA
22、TING OFFSHORE STRUCTURES . 2005 5 S E C T I O N 1 Introduction 1 Background and Applicability These Guidance Notes serve to illustrate an envisioned scope and method to perform spectral fatigue analysis for various types of floating offshore structures. Spectral fatigue analysis relies on the presum
23、ed linearity of wave-induced loads with respect to waves. This condition is sufficiently satisfied for ship-type offshore installations; such as Floating Production, Storage and Offloading (FPSO) and Floating Storage and Offloading (FSO) systems. For a ship-type hull, linear diffraction forces are t
24、he dominant component of wave load. The presentation given herein illustrates the application of the spectral fatigue analysis method to a ship-type hull. For other structural types composed of members with relatively large cross sectional dimensions; such as a Tension Leg Platform, Spar, or Column
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