GB/T 36409-2018Method of structural design for self-elevating units—Load and resistance factor design (LRFD) method (English PDF)
自升式平台结构设计方法 载荷抗力系数设计法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 7, 2018
Implementation date
January 1, 2019
Scope
GB/T 36409-2018 is the English-translated version of 自升式平台结构设计方法 载荷抗力系数设计法.
GB/T 36409-2018 sets out the structural design of steel self-elevating units, or jack-ups, by the load and resistance factor design (LRFD) method. It covers structural classification into primary, secondary and special members, material selection, and design criteria with design conditions, environmental conditions and analysis methods.
It then deals with design loads, namely fixed, variable functional, environmental, deformation, accidental and fatigue loads and their combination. Checks are organised by limit state: ultimate limit state, fatigue limit state and accidental limit state, the last covering collision, falling objects, fire, explosion and accidental water.
Special considerations include pre-ballasting capacity, overturning stability and air gap. It was issued on 7 June 2018 and has applied since 1 January 2019.
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Document preview — GB/T 36409-2018
National Standard of the People's Republic of China
- ICS
- 47.020.99
- Classification
- U 11
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Symbols and Abbreviations
- 4.1 Symbol
- 4.2 Abbreviations
- 5 Structural classification and material selection
- 5.1 General
- 5.2 Structural classification
- 5.3 Material Selection
- 6 Design Criteria
- 6.1 General Rules
- 6.2 Design Condition
- 6.3 Environmental conditions
- 6.4 Analysis Method
- 7 Design Load
- 7.1 General
- 7.2 Fixed load
- 7.3 Variable Functional Load
- 7.4 Environmental Loads
- 7.5 Deformation load
- 7.6 Unexpected load
- 7.7 Fatigue Load
- 7.8 Load Combination
- 8 Ultimate Limit State (ULS)
- 8.1 General Rule
- 8.2 Structural Performance
- 9 Fatigue Limit State (FLS)
- 9.1 General Clause
- 9.2 Fatigue Analysis
- 10 Unexpected Extreme State (ALS)
- 10.1 General Rule
- 10.2 Collision
- 10.3 Falling Objects
- 10.4 Fire
- 10.5 Explosion
- 10.6 Accidental water
- 11 Special Considerations
- 11.1 Pre-ballasting capacity
- 11.2 Overturn stability
- 11.3 Air gap
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the structure classification, material selection, and design criteria for self-elevating platform structure design based on the load resistance coefficient design method. Design load, final limit state, fatigue limit state, unexpected limit state, and special considerations.
This standard applies to the structural design of steel self-elevating platforms.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 712-2011 Structural Steel for Ships and Marine Engineering
ISO 19901-2 Particular Requirements for Offshore Structures Part 2. Seismic Design Procedures and Standards
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Self-elevating platform
A platform body with sufficient buoyancy is used to migrate to a predetermined job site and establish a foundation in a work mode by lowering the legs to A mobile platform that raises the main body to the desired height in order to achieve the operating mode.
3.2 Baseline
Pass a horizontal line on the top edge of the platform floor.
3.3 Primary member
Components that have an important role in the overall integrity of the platform structure.
3.4 Secondary member
Failures do not affect non-essential components of the overall structural integrity of the platform.
3.5 Special member
Main components at key load transfer points and stress concentrations.
3.6 In situation conditions
The platform lowers the legs and raises the main body.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 22 pages — is available in the English PDF.
Referenced standards
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