ABS-130-2004.pdf
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1、 GUIDANCE NOTES ON THE STRENGTH ASSESSMENT OF CARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN OIL CARRIERS 150 METERS OR MORE IN LENGTH MAY 2004 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2004 American Bureau of Shipping ABS Plaza 16855 Nort
2、hchase Drive Houston, TX 77060 USA Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright Ame
3、rican Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON THE STRENGTH ASSESSMENT OF CARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN
4、OIL CARRIERS 150 METERS OR MORE IN LENGTH . 2004 iii Foreword These Guidance Notes were developed as a direct response to requests from our clients to develop an analysis procedure for the forward and aft tank structure beyond 0.4L. This procedure is based on existing ABS SafeHull procedures include
5、d in the ABS Rules. It should be noted that ABS is currently working within IACS on the Joint Tanker Project (JTP) and some components of these Guidance Notes have been developed using JTP procedures. It is understood that this process will continue and once the JTP Rules mature, these Guidance Note
6、s will be unified with respect to components such as the net thickness, loads, acceptance criteria, etc. These Guidance Notes describe a strength assessment procedure for cargo tank structures beyond 0.4L amidships in oil carriers having L greater than 150 meters. In addition to the Rule scantlings
7、as required by Section 5-1-6 “Hull Structure Beyond 0.4L Amidships” of the ABS Rules for Building and Classing Steel Vessels (SVR), these Guidance Notes may be optionally applied to verify the strength adequacy of main supporting members using a set of standard design load cases. Application of the
8、procedure is required for novel structural configurations or scantlings/details. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Th
9、is 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 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON THE STRENGTH ASSESSMENT OF C
10、ARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN OIL CARRIERS 150 METERS OR MORE IN LENGTH . 2004 v GUIDANCE NOTES ON THE STRENGTH ASSESSMENT OF CARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN OIL CARRIERS 150 METERS OR MORE IN LENGTH CONTENTS SECTION 1 Introduction1 1 Scope of Application1 3 Overview o
11、f Strength Assessment.1 5 Coordinate Systems.2 5.1 Ship Coordinate System for Ship Motion and External Pressure (Right Hand) 2 5.3 Tank Coordinate System for Internal Pressure (Left Hand)2 5.5 Finite Element Coordinate System (Right Hand).3 7 Nomenclature.3 FIGURE 1 Outline of the Strength Assessmen
12、t Procedure.5 FIGURE 2 Tank Coordinate System for Internal Pressure6 SECTION 2 SafeHull Dynamic Load Criteria7 1 General 7 3 Vertical Wave-induced Bending Moment.7 5 Horizontal Wave-induced Bending Moment 8 7 External Pressure 8 9 Internal Pressure9 9.1 Effective Pitch Amplitude 9 9.3 Effective Roll
13、 Amplitude 9 9.5 Effective Accelerations10 9.7 Internal Pressure.11 11 Bottom Slamming Pressure.11 TABLE 1 klo Coefficient .8 TABLE 2 Coefficient.12 TABLE 3 Ai and Bi Coefficients12 FIGURE 1 Distribution Factor for Vertical Wave-induced Bending Moment mv.13 Copyright American Bureau of Shipping Prov
14、ided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON THE STRENGTH ASSESSMENT OF CARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN OIL vi CARRIERS 150 METERS OR
15、 MORE IN LENGTH . 2004 FIGURE 2 Distribution Factor for Horizontal Wave-induced Bending Moment mh.13 FIGURE 3 Pressure Distribution Function klo14 FIGURE 4 External Pressure Calculation Points 14 SECTION 3 Standard Design Load Cases.15 TABLE 1 Standard Design Load Cases15 FIGURE 1 Standard Design Lo
16、ad Cases for Oil Carrier with Two Outer Longitudinal Bulkheads Only .16 FIGURE 2 Standard Design Load Cases for Oil Carrier with Two Outer Longitudinal Bulkheads and One Centerline Longitudinal Bulkhead18 FIGURE 3 Standard Design Load Cases for Oil Carrier with Two Outer Longitudinal Bulkheads and T
17、wo Inner Longitudinal Bulkheads.22 SECTION 4 Structural Modeling and Analysis27 1 Net Ship Approach.27 3 Structural Idealization 27 3.1 Extent of Finite Element Model27 3.3 Finite Element Modeling28 5 Boundary Constraints for Local and Hull Girder Sub Load Cases.29 5.1 Local Sub Load Case29 5.3 Hull
18、 Girder Sub Load Case30 7 Overall Check of Finite Element Results.30 TABLE 1 Nominal Design Corrosion Values (NDCV) .31 FIGURE 1 Nominal Design Corrosion Values (NDCV) .32 FIGURE 2 Typical Finite Element Model for Foremost Cargo Tank Structure32 FIGURE 3 Typical Finite Element Model for Aftmost Carg
19、o Tank Structure33 FIGURE 4 Modeling of Bracket Toe and Tapered Face Plate33 FIGURE 5 Boundary Constraints for Local Sub Load Cases34 FIGURE 6 Loads and Boundary Constraints for Hull Girder Sub Load Cases.35 SECTION 5 Acceptance Criteria.37 1 General 37 3 Yielding Failure Mode37 3.1 Field Stress .37
20、 3.3 Local Stress.37 3.5 Hot-Spot Stress.38 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON THE STRENGTH ASSE
21、SSMENT OF CARGO TANK STRUCTURES BEYOND 0.4L AMIDSHIPS IN OIL CARRIERS 150 METERS OR MORE IN LENGTH . 2004 vii 3.7 Allowable Stresses for Various Finite Element Mesh Sizes .38 5 Buckling Failure Mode .38 5.1 Buckling Control Concepts39 5.3 Buckling Criteria40 TABLE 1 Allowable Stresses (kgf/cm2) for
22、Various Finite Element Mesh Sizes38 FIGURE 1 Coordinate System for Buckling Strength Evaluation 40 SECTION 6 Documentation of Strength Assessment for Classification Review 41 APPENDIX 1 Calculation of Critical Buckling Stresses43 1 General 43 3 Rectangular Plates.43 5 Deep Girders, Webs and Stiffene
23、d Brackets.44 5.1 Critical Buckling Stresses of Web Plates and Large Brackets44 5.3 Effects of Cut-outs.44 5.5 Tripping.44 7 Stiffness and Proportions.45 7.1 Stiffness of Web Stiffeners45 7.3 Stiffness of Supporting Members45 7.5 Proportions of Flanges and Face Plates .46 TABLE 1 Buckling Coefficien
24、t Ki.47 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:24:15 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Pr
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