ABS 184-2011 GUIDE FOR BUILDING AND CLASSING DRILLSHIPS Guide to Color Coding Used in Online Version of the Guide.pdf

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1、 GUIDE FOR BUILDING AND CLASSING DRILLSHIPS AUGUST 2011 Guide to Color Coding Used in Online Version of the Guide The following summarizes the colors corresponding to Rule Changes, Corrigenda items and editorial changes in the Guide files which are available for download. Rule Changes: NOTICE NO. 1

2、January 2016 (effective 1 January 2016) Corrigenda: CORRIGENDA/EDITORIALS 1 January 2012 CORRIGENDA/EDITORIALS 1 July 2013 CORRIGENDA/EDITORIALS 1 February 2014 Editorials: Editorial Changes Guide for Building and Classing Drillships GUIDE FOR BUILDING AND CLASSING DRILLSHIPS HULL STRUCTURAL DESIGN

3、AND ANALYSIS AUGUST 2011 (Updated January 2016 see next page) American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2011 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Updates January 2016 consolidation includes: Fe

4、bruary 2014 version plus Notice No. 1 February 2014 consolidation includes: July 2013 version plus Corrigenda/Editorials July 2013 consolidation includes: January 2012 version plus Corrigenda/Editorials January 2012 consolidation includes: August 2011 version plus Corrigenda/Editorials ABSGUIDE FOR

5、BUILDING AND CLASSING DRILLSHIPS .2011 iii Foreword Foreword This ABS Guide for Building and Classing Drillships provides criteria that can be applied in the classification of the hull structure of monohull surface-type and ship-shaped drilling units (i.e., drillships). Requirements for classificati

6、on of drillships are included in the ABS Rules for Building and Classing Mobile Offshore Drilling Units (MODU Rules). The hull strength criteria contained in this Guide are to be used in conjunction with Part 3, Chapter 2 of the MODU Rules. The requirements for conditions of classification are conta

7、ined in the separate, generic ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1) for all units, installations, vessels or systems in offshore service. The purpose of the Rules for Conditions of Classification “Part 1” is to emphasize the common applicability of the cla

8、ssification requirements in “Part 1” to ABS-classed offshore units, pipelines, risers, and other offshore structures, and thereby make “Conditions of Classification” more readily a common Rule of the various ABS Rules and Guides, as appropriate. Section 1 of this Guide specifies only the unique supp

9、lemental requirements applicable to drillships. These supplemental requirements are always to be used with the aforementioned ABS Rules for Conditions of Classification Offshore Units and Structures (Part 1). The effective date of this Guide is 1 August 2011. The application of this Guide is optiona

10、l, and unless this Guide is specifically requested by an ABS Request For Class (RFC), ABS design review will follow current practice. However, from 1 January 2012, the ABS MODU Rules will require compliance with this Guide. Reference Note Reference to a paragraph in the Steel Vessel Rules or MODU Ru

11、les is made in the format P-C-S/ss.p.sp where P is the Part, C is the Chapter, S is the Section, ss is the Subsection, p is the Paragraph and sp is the Subparagraph. Reference to a paragraph in this Guide is made in the format S/ss.p.sp, where S is the Section, ss is the Subsection, p is the Paragra

12、ph and sp is the Subparagraph. Reference to a Figure or Table in this Guide is made, respectively, in the format S, Figure #, or S, Table #. iv ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 Table of Contents GUIDE FOR BUILDING AND CLASSING DRILLSHIPS CONTENTS SECTION 1 Introduction 1 1 General

13、 . 1 1.1 Classification Notations . 1 1.3 Application . 2 1.5 Internal Members . 2 1.11 Breaks . 3 1.13 Variations . 4 1.15 Loading Guidance 4 1.17 Alternatives 4 3 Definitions . 4 3.1 Length 4 3.3 Breadth (B) 5 3.5 Depth . 5 3.7 Draft (d) 5 3.9 Molded Displacement () . 5 3.11 Block Coefficient (Cb)

14、 . 5 3.13 Decks . 6 3.15 Deadweight and Lightship Weight . 6 3.17 Mode of Operation . 6 3.19 Units 6 FIGURE 1 . 3 FIGURE 2 . 5 SECTION 2 Design Considerations 7 1 General Requirements 7 1.1 General 7 1.3 Initial Scantling Requirements . 7 1.5 Total Strength Assessment Failure Modes . 8 1.7 Topside a

15、nd Hull Interface Structures 8 1.9 Material Selection 8 3 Net Scantlings and Nominal Design Corrosion Values 8 3.1 General 8 3.3 Nominal Design Corrosion Values for Design Life Greater than 20 years . 9 TABLE 1 Nominal Design Corrosion Values (NDCV) 10 ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .

16、2011 v SECTION 3 Loads . 11 1 General . 11 1.1 The Concept and Application of Environmental Severity Factors 11 1.3 Load Components . 11 3 Static Loads 11 3.1 Still-water Bending Moment and Shear Force . 11 5 Wave-induced Loads 12 5.1 Vertical Wave Induced Longitudinal Bending Moments and Shear Forc

17、es . 12 5.3 Horizontal Wave Induced Bending Moment and Shear Forces . 15 5.5 External Pressures 16 5.7 Internal Pressures Inertia Forces and Added Pressure Heads 19 7 Nominal Design Loads 27 7.1 General 27 7.3 Hull Girder Loads Longitudinal Bending Moments and Shear Forces . 27 7.5 Local Loads for D

18、esign of Transverse Bulkhead Structures 28 7.7 Local Pressures for Design of Plating and Longitudinals 28 9 Combined Load Cases . 28 9.1 Combined Load Cases for Structural Analysis 28 9.3 Combined Load Cases for Fatigue Analysis 29 9.5 Combined Load Cases for Failure Assessment 29 11 Sloshing Loads

19、. 33 11.1 General 33 11.3 Strength Assessment of Tank Boundary Structures 33 11.5 Sloshing Pressures . 34 13 Impact Loads 42 13.1 Impact Loads on Bow 42 13.3 Bottom Slamming 43 13.5 Bowflare Slamming . 46 13.7 Green Water on Deck 48 15 Deck Loads . 49 15.1 General 49 15.3 Loads for On-Site Operation

20、 50 15.5 Loads in Transit Condition . 51 TABLE 1 Combined Load Cases . 30 TABLE 2 Design Pressure for Local and Supporting Members . 31 TABLE 3 Values of 45 TABLE 4 Values of Ai and Bi. 45 TABLE 5 Values of Aiand Bi47 TABLE 6 Values of Ai. 49 TABLE 7 Correlation Factors cv, cT, cL, Cand C. 51 vi ABS

21、GUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 FIGURE 1 Sign Convention 12 FIGURE 2 Distribution Factor M . 14 FIGURE 3 Distribution Factor F1. 14 FIGURE 4 Distribution Factor F2. 14 FIGURE 5 Distribution Factor mh15 FIGURE 6 Distribution Factor fh16 FIGURE 7 Distribution of hdi18 FIGURE 8 Pressur

22、e Distribution Function ko. 18 FIGURE 9 Illustration of Determining Total External Pressure 19 FIGURE 10 Definition of Tank Geometry . 25 FIGURE 11 Location of Tank or Hold for Nominal Pressure Calculation 26 FIGURE 12 Vertical Distribution of Equivalent Sloshing Pressure Head, he. 38 FIGURE 13 Hori

23、zontal Distribution of Simultaneous Sloshing Pressure Heads, hc(ss) or ht(ss) . 39 FIGURE 14 Definitions for Opening Ratio, 40 FIGURE 15 Opening Ratios . 40 FIGURE 16 Dimensions of Internal Structures . 41 FIGURE 17 Definition of Bow Geometry 43 FIGURE 18 Distribution of Bottom Slamming Pressure Alo

24、ng the Section Girth . 45 FIGURE 19 Definition of Bowflare Geometry for Bowflare Shape Parameter . 47 FIGURE 20 Stem Angle, 48 SECTION 4 Initial Scantling Evaluation 52 1 General . 52 1.1 Strength Requirement 52 1.3 Calculation of Load Effects 52 1.5 Structural Details . 52 1.7 Evaluation of Grouped

25、 Stiffeners . 52 3 Hull Girder Strength 53 3.1 Hull Girder Section Modulus 53 3.3 Bending Strength Standard . 53 3.5 Longitudinal Strength with Higher-Strength Materials 54 3.7 Section Modulus Calculation . 55 3.9 Hull Girder Ultimate Strength . 56 5 Shearing Strength . 57 5.1 General 57 5.3 Methods

26、 of Calculation 57 5.5 Calculation of the Shear Flow Around Closed Sections . 57 5.7 Allowable Stresses 58 5.9 Three Dimensional Analysis 58 ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 vii 7 Double Bottom Structures . 58 7.1 General 58 7.3 Bottom Shell and Inner Bottom Plating 59 7.5 Bottom

27、and Inner Bottom Longitudinals 62 7.7 Bottom Girders/Floors . 63 9 Side Shell and Deck Plating and Longitudinals . 69 9.1 Side Shell Plating 69 9.3 Deck Plating 71 9.5 Deck and Side Longitudinals . 72 11 Side Shell and Deck Main Supporting Members . 74 11.1 General 74 11.3 Minimum Thickness for Web

28、Portion of Main Supporting Members . 74 11.5 Minimum Depth for Web Portion of Main Supporting Members . 74 11.7 Brackets 75 11.9 Web Stiffeners and Tripping Brackets . 75 11.11 Slots and Lightening Holes 75 13 Longitudinal and Transverse Bulkheads . 75 13.1 Longitudinal Bulkhead Plating . 75 13.3 Mo

29、onpool Longitudinal Side Plating 77 13.5 Transverse Bulkhead Plating and Moonpool Transverse Side Plating . 79 13.7 Longitudinals and Vertical/Horizontal Stiffeners 80 15 Stringers Forming Tank Boundaries . 81 15.1 Side Stringers Forming Tank Boundaries 81 15.3 Watertight Flat Forming Tank Boundarie

30、s . 82 15.5 Tween Deck Forming Tank Boundaries 83 15.7 Longitudinal Stiffeners . 83 15.9 Minimum Thickness for Non-tight Flat and Non-tight Tween Deck 84 15.11 Tween Deck Not Forming Tank Boundary. 84 15.13 Stiffeners on Tween Deck Not Forming Tank Boundary . 84 17 Corrugated Bulkheads 85 17.1 Gener

31、al 85 17.3 Plating . 85 17.5 Stiffness of Corrugation . 86 17.7 Supporting Structures 86 FIGURE 1 Effective Area of Hull Girder Members . 56 FIGURE 2 . 59 FIGURE 3 Unsupported Span of Longitudinal . 67 FIGURE 4 Effective Breadth of Plating be. 68 FIGURE 5 Definition of Parameters for Corrugation 86

32、FIGURE 6 . 87 FIGURE 7 Supporting Structures for Corrugation 87 viii ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 SECTION 5 Total Strength Assessment . 88 1 Structural Analysis 88 1.1 General 88 1.3 Loads and Load Cases 88 1.5 Stress Components . 88 1.7 Stress Adjustment 89 3 Failure Criteria

33、 Yielding 89 3.1 General 89 3.3 Watertight Structural Members and Elements . 89 3.5 Non-tight Structural Members and Elements . 92 5 Failure Criteria Buckling and Ultimate Strength . 93 5.1 General 93 5.3 Plate Panels 94 5.5 Longitudinals and Stiffeners 95 5.7 Stiffened Panels. 96 5.9 Deep Girders a

34、nd Webs 97 5.11 Corrugated Bulkheads . 99 7 Calculation of Critical Buckling Stresses 100 7.1 General 100 7.3 Rectangular Plates 100 7.5 Longitudinals and Stiffeners 103 7.7 Stiffened Panels. 105 7.9 Stiffness and Proportions . 108 9 Fatigue Life . 109 9.1 General 109 9.3 Procedures 110 9.5 Spectral

35、 Analysis . 110 11 Calculation of Structural Responses . 111 11.1 Methods of Approach and Analysis Procedures 111 11.3 3D Finite Element Models 111 11.5 Local Structural Models . 111 11.7 Load Cases . 111 13 Critical Areas . 111 13.1 General 111 13.3 Strength Evaluation . 111 13.5 Fatigue Evaluation

36、 . 112 TABLE 1 Buckling Coefficient, Ki. 101 TABLE 2 Allowable Stresses for Various Finite Element Fine Mesh Sizes . 112 FIGURE 1 Stress Checking Points of Plate 90 FIGURE 2 Coordinate System for Buckling Strength Evaluation . 98 FIGURE 3 Net Dimensions and Properties of Stiffeners 105 FIGURE 4 . 10

37、7 FIGURE 5 Critical Areas in Transverse Web Frame 112 FIGURE 6 Critical Areas in Horizontal Supporting Member on Transverse Bulkhead 113 ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 ix SECTION 6 Hull Structure Beyond 0.4L Amidships 114 1 General Requirements 114 1.1 General 114 1.3 Structures

38、 Beyond 0.4L Amidships . 114 3 Forebody Side Shell Structure 114 3.1 Side Shell Plating 114 3.3 Forecastle Side Shell Plating . 115 3.5 Side Frames and Longitudinals . 116 3.7 Side Transverses/Stringers . 117 3.9 Bow Thruster Tunnel . 119 5 Transition Zone . 120 7 Aftbody Structure 120 7.1 Poop Side

39、 Plating 120 7.3 Transom Plating 120 7.5 Aft Peak Bulkhead . 121 9 Deck Structures 122 9.1 Deck Structures in Forebody . 122 9.3 Forecastle Decks . 123 9.5 Poop Decks . 124 9.7 Pillars or Struts 124 11 Collision Bulkheads . 125 11.1 Plating . 125 11.3 Stiffeners . 125 13 Forebody Strengthening for S

40、lamming . 126 13.1 Bottom Slamming 126 13.3 Bowflare Slamming . 127 FIGURE 1 Transverse Distribution of pd. 117 FIGURE 2 Definition of Spans 119 SECTION 7 Topside and Hull Interface Structures 129 1 Design and Analysis of Hull Interface Structures . 129 1.1 Hull-Topside Interface Modeling 129 1.3 Lo

41、ad Conditions 130 1.5 Inertial Load Cases . 131 1.7 Hull Girder Load Cases . 131 1.9 Acceptance Criteria . 131 1.11 Fatigue Calculations 132 1.13 Fillet Weld Design . 133 1.15 Stool and Crane Pedestal Weld Requirements . 135 3 Topside Structures 137 3.1 General 137 3.3 Loads 137 3.5 Strength Assessm

42、ent 138 3.7 Material Selection for Topside and Hull Interface Structures . 138 3.9 Fatigue Assessment 138 x ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 TABLE 1 Safety Factors for Fatigue Life of Hull-Topside Interface Structures 133 FIGURE 1 Topside Stool Minimum Weld Requirements 136 FIGURE

43、 2 Crane Pedestal Minimum Weld Requirements . 136 APPENDIX 1 Determination of Environmental Severity Factors 139 1 General . 139 3 ESFs of the Beta () Type 139 5 ESFs of the Alpha () Type 140 TABLE 1 The 13 Dynamic Load Parameters or ESFs (NN). 140 APPENDIX 2 Fatigue Strength Assessment of Drillship

44、s . 142 1 General . 142 1.1 Note . 142 1.3 Applicability 142 1.5 Loadings 142 1.7 Effects of Corrosion . 142 1.9 Format of the Criteria . 142 3 Connections to be Considered for the Fatigue Strength Assessment. 143 3.1 General 143 3.3 Guidance on Locations 143 5 Fatigue Strength Assessment . 149 5.1

45、Assumptions 149 5.3 Criteria . 149 5.5 Long Term Stress Distribution Parameter, 149 5.7 Cumulative Fatigue Damage . 150 7 Fatigue Inducing Loads and Determination of Total Stress Ranges 154 7.1 General 154 7.3 Wave-induced Loads Load Components 154 7.5 Fatigue Assessment Loading Conditions 154 7.7 P

46、rimary Stress fd1. 157 7.9 Secondary Stress fd2157 7.11 Additional Secondary Stresses f*d2and Tertiary Stresses fd3157 9 Resulting Stress Ranges 160 9.1 Definitions 160 11 Determination of Stress Concentration Factors (SCFs) . 161 11.1 General 161 11.3 Sample Stress Concentration Factors (SCFs) . 16

47、1 13 Stress Concentration Factors Determined From Finite Element Analysis . 168 13.1 Introduction 168 13.3 S-N Data 168 13.5 S-N Data and SCFs . 168 13.7 Calculation of Hot Spot Stress for Fatigue Analysis . 170 ABSGUIDE FOR BUILDING AND CLASSING DRILLSHIPS .2011 xi TABLE 1 Fatigue Classification fo

48、r Structural Details 144 TABLE 2A Design Fatigue Load Cases for Fatigue Strength Assessment (Load Combination Factors for Dynamic Load Components for Transit Condition) 155 TABLE 2B Design Fatigue Load Cases for Fatigue Strength Assessment (Load Combination Factors for Dynamic Load Components for No

49、rmal Drilling Condition) . 156 TABLE 3 Ks(SCF) Values 162 FIGURE 1 Basic Design S-N Curves . 152 FIGURE 2 Cn= Cn() . 159 FIGURE 3 Cut-outs (Slots) For Longitudinal 163 FIGURE 4 Fatigue Classification for Longitudinals in way of Flat Bar Stiffener . 165 FIGURE 5 . 165 FIGURE 6 . 166 FIGURE 7 . 166 FIGURE 8 . 167 FIGURE 9 Doublers and Non-load Carrying Members on Deck or Shell Plating 167 FIGURE 10 . 170 FIGURE 11 . 170 FIGURE 12 . 171 APPENDIX 3 Hull Girder Ultimate Strength 172 1 Genera