ABS 172-2017 GUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS.pdf
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1、 Guidance Notes on Springing Assessment for Container Carriers and Ore Carriers GUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS JUNE 2017 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2017 American Bureau of Shipping. All
2、rights reserved. ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword The 2017 edition of these Guidance Notes expands the scope from just container carriers to include ore carriers; which has necessitated the title change to the ABS Guidance Notes on Springing Assessment for Con
3、tainer Carriers and Ore Carriers. These Guidance Notes provide detailed procedures for the assessment of springing loads and the subsequent structural fatigue damage for container and ore carriers. The technical background is based on direct analysis of hydrodynamic load and structure dynamic respon
4、se. Additionally, these Guidance Notes supplement the Rules and Guides that ABS has issued for the Classification for container carriers. The ABS Guide for Application of Higher-Strength Hull Structural Thick Steel Plates in Container Carriers requires the evaluation of the springing effect on fatig
5、ue damage of hull structures. These Guidance Notes address how to carry out such evaluations. The 2014 edition included an updated wave scatter diagram table and editorial changes. The 2017 edition includes new and updated standard speed profiles, a new time-domain approach for fatigue damage, updat
6、ed S-N curves to include second segment, and editorial changes. These Guidance Notes become effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of these Guidance Notes is the most current. Commen
7、ts or suggestions can be sent electronically to rsdeagle.org Terms of Use The information presented herein is intended solely to assist the reader in the methodologies and/or techniques discussed. These Guidance Notes do not and cannot replace the analysis and/or advice of a qualified professional.
8、It is the responsibility of the reader to perform their own assessment and obtain professional advice. Information contained herein is considered to be pertinent at the time of publication, but may be invalidated as a result of subsequent legislations, regulations, standards, methods, and/or more up
9、dated information and the reader assumes full responsibility for compliance. This publication may not be copied or redistributed in part or in whole without prior written consent from ABS. ii ABSGUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS .2017 Table of Contents GU
10、IDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS CONTENTS SECTION 1 Introduction 1 1 General . 1 2 Springing Phenomenon 1 3 Springing Assessment Procedure 2 FIGURE 1 Time History of Measured Vertical Bending Moment . 1 FIGURE 2 Springing Assessment Procedure. 3 SECTION 2
11、Loading Conditions, Speeds, and Headings . 4 1 General . 4 2 Loading Conditions . 4 3 Standard Speed Profile . 4 4 Wave Heading 4 TABLE 1 Standard Speed Profile for Container Carriers . 4 TABLE 2 Standard Speed Profile for Ore Carriers . 4 SECTION 3 Wave Environments . 5 1 Wave Scatter Diagram 5 2 W
12、ave Spectrum 5 TABLE 1 ABS Wave Scatter Diagram for Unrestricted Service Classification . 5 SECTION 4 Springing Susceptibility Assessment 7 1 General . 7 2 Hull Girder Natural Frequency 7 3 Wave Characteristics 7 4 Springing Susceptibility . 8 FIGURE 1 Probability Distribution of Tz8 FIGURE 2 Typica
13、l Dynamic Amplification Factor . 9 FIGURE 3 Springing Susceptibility Indicator 9 ABSGUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS .2017 iii SECTION 5 Calculation of Response Amplitude Operator . 10 1 General . 10 2 Vertical Bending Moment RAOs of Rigid Body . 10 2.1
14、General Modeling Consideration . 11 2.2 Hydrostatic Balance . 11 2.3 Roll Damping . 11 3 Vertical Bending Moment RAO of Flexible Body 12 3.1 Calculation of 2-Node Vibration Mode . 12 3.2 Hydroelasticity . 13 3.3 Large Range of Wave Frequency 13 4 Springing Damping . 14 5 Stress RAO Calculation 14 FI
15、GURE 1 Definition of Ship Motion . 10 FIGURE 2 Vertical Bending Moment RAO (rigid body) 12 FIGURE 3 2-Node Vertical Vibration Mode 12 FIGURE 4 Bending Stiffness Distribution . 13 FIGURE 5 Vertical Bending RAO Distribution 13 SECTION 6 Response Statistics . 15 1 General . 15 2 Short Term Statistics .
16、 15 FIGURE 1 Vertical Bending Moment Response Spectra . 16 SECTION 7 Fatigue Assessment . 17 1 General . 17 2 Frequency-Domain Approach for Fatigue Damage 17 2.1 General 17 2.2 Wave-Frequency Response Fatigue Damage . 18 2.3 Combined Wave and Springing Response Fatigue Damage . 18 3 Time-Domain Appr
17、oach for Fatigue Damage . 19 3.1 General 19 3.2 Short-Term Fatigue Damage . 20 3.3 Long-Term Fatigue Damage 20 4 Fatigue Damage Assessment . 21 4.1 Springing Contribution to Fatigue Damage 21 4.2 Fatigue Damage Assessment 21 APPENDIX 1 Fatigue Strength Assessment . 22 1 General . 22 1.1 Note . 22 1.
18、2 Applicability 22 1.3 Loadings 22 1.4 Effects of Corrosion . 22 1.5 Format of the Criteria . 22 iv ABSGUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS .2017 2 Connections to be Considered for the Fatigue Strength Assessment 23 2.1 General 23 2.2 Guidance on Locations f
19、or Container Carriers 23 2.3 Guidance on Locations for Ore Carriers 23 2.4 Fatigue Classification 24 3 Fatigue Damage Calculation 36 3.1 Assumptions 36 3.2 Criteria . 37 3.3 Long Term Stress Distribution Parameter, 37 3.4 Fatigue Damage 37 4 Fatigue Inducing Loads and Load Combination Cases 40 4.1 G
20、eneral 40 4.2 Wave-induced Loads . 40 4.3 Combinations of Load Cases for Fatigue Assessment 40 5 Determination of Wave-induced Stress Range 41 5.1 General 41 5.2 Hatch Corners . 41 6 Hot Spot Stress Approach with Finite Element Analysis 50 6.1 Introduction 50 6.2 Calculation of Hot Spot Stress at a
21、Weld Toe . 51 6.3 Calculation of Hot Spot Stress at the Edge of Cut-out or Bracket 53 TABLE 1 Fatigue Classification for Structural Details 25 TABLE 2 Welded Joint with Two or More Load Carrying Members for Container Carriers . 28 TABLE 3 Welded Joint with Two or More Load Carrying Members for Ore C
22、arriers 34 TABLE 4 Combined Load Cases for Fatigue Strength Formulation for Container Carriers . 40 TABLE 5 Combined Load Cases for Fatigue Strength Formulation for Ore Carriers 41 FIGURE 1 Basic Design S-N Curves . 39 FIGURE 2 Hatch Corners at Decks and Coaming Top 48 FIGURE 3 Circular Shape 49 FIG
23、URE 4 Double Curvature Shape 49 FIGURE 5 Elliptical Shape 49 FIGURE 6 Hatch Corner for Longitudinal Deck Girder . 50 FIGURE 7 . 51 FIGURE 8 . 53 ABSGUIDANCE NOTES ON SPRINGING ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS .2017 v This Page Intentionally Left Blank ABSGUIDANCE NOTES ON SPRINGING
24、 ASSESSMENT FOR CONTAINER CARRIERS AND ORE CARRIERS .2017 1 Section 1: Introduction SECTION 1 Introduction 1 General (1 June 2017) The design and construction of the hull, superstructure, and deckhouses of container carriers and ore carriers are to be based on the applicable requirements of the ABS
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