ABS 124-2014 GUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELFELEVATING UNITS.pdf
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1、 GUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS FEBRUARY 2014 Guide to Color Coding Used in Online Version of the Guidance Notes The following summarizes the colors corresponding to Rule Changes, Corrigenda items and editorial changes in the Guidance Notes files which are avai
2、lable for download. Rule Changes: Changes effective 1 February 2014 Corrigenda: CORRIGENDA/EDITORIALS 1 September 2014 Editorials: Editorial Changes Guidance Notes on Dynamic Analysis Procedure for Self-Elevating Units GUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS FEBRUARY 20
3、14 (Updated September 2014 see next page) American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2014 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Updates September 2014 consolidation includes: February 2014 versio
4、n plus Corrigenda/Editorials ABSGUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS .2014 iii Foreword Foreword The guidance contained herein should be used in conjunction with the ABS Rules for Building and Classing Mobile Offshore Drilling Units for the purpose of ABS Classificat
5、ion of a Self-Elevating Unit. The guidance indicates acceptable practice in a typical case for types of designs that have been used successfully over many years of service. The guidance may need to be modified to meet the needs of a particular case, especially when a novel design or application is b
6、eing assessed. The guidance should not be considered mandatory, and in no case is this guidance to be considered a substitute for the professional judgment of the designer or analyst. In case of any doubt about the application of this guidance ABS should be consulted. A self-elevating unit is referr
7、ed to herein as an “SEU”, and the ABS Rules for Building and Classing Mobile Offshore Drilling Units, are referred to as the “MODU Rules”. 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 v
8、erify that this version of these Guidance Notes is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to rsdeagle.org. iv ABSGUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS .2014 Table of Contents GUIDANCE NOTES ON DYNAMIC AN
9、ALYSIS PROCEDURE FOR SELF-ELEVATING UNITS CONTENTS SECTION 1 Introduction 1 1 Background . 1 3 Basic Concepts of the Inclusion of Dynamic Effects into Structural Analysis . 1 5 Exception 2 FIGURE 1 Flowchart of the Two-Step Procedure 3 SECTION 2 Specification of Wave Parameters and Spudcan-Soil Stif
10、fness . 4 1 Introduction . 4 3 Spectral Characterization of Wave Data for Dynamic Analysis 4 5 Spudcan-Soil Rotational Stiffness (SC-S RS) 5 SECTION 3 Dynamic Analysis Modeling 6 1 Introduction . 6 3 Stiffness Modeling . 6 3.1 Leg Stiffness 6 3.3 Hull Stiffness 7 3.5 Leg-to-Hull Connection Stiffness
11、 . 7 3.7 P-Delta Effect (P-) . 7 3.9 Foundation Stiffness 8 5 Modeling the Mass 8 7 Hydrodynamic Loading . 8 9 Damping 8 SECTION 4 Dynamic Response Analysis Methods . 10 1 General . 10 3 Random Wave Dynamic Analysis in Time Domain 10 3.1 General 10 3.3 Random Wave Generation 10 3.5 Calculation of St
12、ructural Response 11 3.7 Prediction of Extreme Responses 12 5 Other Dynamic Analysis Methods . 17 5.1 Single-Degree-of-Freedom Approach 17 ABSGUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS .2014 v FIGURE 1 The Drag-Inertia Method Including DAF Scaling Factor . 14 FIGURE 2 Grap
13、hical Representation of DAF Scaling Factor, FDAF, Applied in the Drag-Inertia Method . 15 FIGURE 3 Dynamic Amplification Factor (SDOF) 19 SECTION 5 Dynamic Amplification Factor and Inertial Load Set . 20 1 Introduction . 20 3 Inertial Load Set based on Random Wave Dynamic Analysis . 20 5 Inertial Lo
14、ad Set based on SDOF Approach 21 7 Inertial Load Set Applications . 21 APPENDIX 1 Equivalent Section Stiffness Properties of a Lattice Leg . 22 1 Introduction . 22 3 Formula Approach 22 3.1 Equivalent Shear Area of 2D Lattice Structures 22 3.3 Equivalent Section Stiffness Properties of 3D Lattice Le
15、gs . 23 5 Unit Load Approach 26 5.1 Unit Axial Load Case . 26 5.3 Unit Shear Load Case . 26 5.5 Unit Torsional Moment Case . 27 TABLE 1 Equivalent Shear Area of 2D Lattice Structures . 24 TABLE 2 Equivalent Moment of Inertia Properties of 3D Lattice Legs 25 FIGURE 1 Shear Force System for X Bracing
16、and its Equivalent Beam . 22 APPENDIX 2 Equivalent Leg-to-Hull Connection Stiffness Properties 28 1 Introduction . 28 3 Empirical Formula Approach. 28 3.1 Horizontal Stiffness . 28 3.3 Vertical Stiffness 28 3.5 Rotational Stiffness . 28 5 Unit Load Approach 29 5.1 Unit Axial Load Case . 29 5.3 Unit
17、Moment Case . 29 5.5 Unit Shear Load Case . 29 APPENDIX 3 Equivalent Hydrodynamic Coefficients of Lattice Legs 30 1 Introduction . 30 3 Equivalent Diameter 30 5 Equivalent Drag Coefficient 30 7 Equivalent Mass Coefficient 32 9 Current Associated with Waves 33 vi ABSGUIDANCE NOTES ON DYNAMIC ANALYSIS
18、 PROCEDURE FOR SELF-ELEVATING UNITS .2014 FIGURE 1 One Bay of Lattice Leg . 31 FIGURE 2 Split-Tube Chord Section 31 FIGURE 3 Triangular Chord Section 32 FIGURE 4 Current Velocity Profile . 33 APPENDIX 4 References 34 ABSGUIDANCE NOTES ON DYNAMIC ANALYSIS PROCEDURE FOR SELF-ELEVATING UNITS .2014 1 Se
19、ction 1: Introduction SECTION 1 Introduction (1 February 2014) 1 Background These Guidance Notes present acceptable practice for an important aspect in the Classification of self-elevating units (SEUs). The technical criteria contained in the original version of these Guidance Notes published in 200
20、4 were based on the results of a Joint Industry Project sponsored by Owners, Designers, Builders, Operators and Classification Societies. The criteria were subsequently published as Reference 1. That reference is specifically aimed at providing assessment criteria for the site-specific use of the SE
21、U. Reference 1 was also used in the development of the International Standards Organization (ISO) Standard 19905-1 Reference 6 for site-specific assessment of mobile offshore units Jack-Ups. There were changes in both required and acceptable methods of assessment when the ISO 19905-1 standard was de
22、veloped from Reference 1. The changes that are relevant to Classification were incorporated into this revision of these GNs. The fundamental difference between site-specific evaluation and Classification is that the latter is not site-specific in nature. Instead, the Owner specifies conditions for w
23、hich the unit is to be reviewed for Classification. The basic dimensions of the envelope of conditions that the Owner may specify for Classification are: i) Water depth (plus air gap and penetration depth into the seabed) ii) Environmental conditions of wind, wave and current iii) Total elevated loa
24、d iv) Spudcan-soil rotational stiffness (The last item is a consideration introduced by ABS in 2003 when dynamic response is assessed for Classification.) Therefore, a major theme of these Guidance Notes is to designate the portions of the criteria in References 1 and 6 that can be applied without m
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