1. LOCAL ANALYSIS FOR OFFSHORE PLATFORMS
1.1. Load Estimation and Distribution
1.1.1. Primary Structure
1.1.2. Secondary Structures
1.1.3. Mechanical Equipment
1.1.4. Piping & Bulks
1.1.5. Electrical Equipment
1.1.6. Instrumentation
1.2. Topside Components
1.2.1. Production Equipment
1.2.2. Facilities
1.2.3. Modular Design
1.3. Jacket Design Principles
1.3.1. Dimension Determination
1.3.2. Hydrodynamic Load Evaluation
1.4. Jacket Design Forces
1.4.1. Horizontal Forces from Waves
1.4.1.1. Inertia Forces
1.4.1.2. Drag Forces
1.4.2. Force Calculation
1.4.3. Iterative Design Process
1.4.3.1. Member Sizing Optimization
2. In-Place Analysis For Fixed Offshore Platforms
2.1. Purpose
2.1.1. Checks global integrity against premature failure.
2.2. Most Critical Analysis
2.2.1. Ultimate Limit State (ULS) design for jackets.
2.3. Analysis Software
2.3.1. SACS
2.4. Material Properties
2.4.1. S420 for legs, piles, and primary members.
2.4.2. S355 for secondary members.
2.5. Loading Considerations
2.5.1. Variable Load
2.5.2. Environmental Loads
2.5.3. Permanent Load
2.6. Environmental Data
2.6.1. Metocean design reports
2.7. Design Principles
2.7.1. Efficient Operation
2.7.2. Safety
2.7.3. Economy
2.7.4. Service Life
2.8. Topside Design Considerations
2.9. Topside Structural Systems
2.9.1. Trusses
2.9.2. Portal Frames
2.9.3. Diagonals
3. GLOBAL ANALYSIS AND DESIGN
3.1. Platform Structure Design Process
3.1.1. Structure Modeling
3.1.1.1. FE Analysis
3.1.2. Simulation
3.1.2.1. Environmental loads
3.1.3. Analysis
3.1.3.1. Worst-case conditions
3.2. Fatigue Life Prediction and Specialized Analyses
3.2.1. Global Hull Girder Strength
3.2.1.1. Floating structures
3.2.2. Jacket In-Place Analysis
3.2.2.1. Fixed platforms
3.2.3. Jacket-Topside Mating Point Analysis
3.2.3.1. Long-term structural integrity and safety
3.3. Maximum Global Loads Calculation
3.3.1. Maximum Base Shear Method
3.3.2. Maximum Overturning Moment Method
3.4. Wave And Current Load Analysis
3.4.1. Calculate wave forces
3.4.2. Calculate current forces
3.4.3. Combine wave and current forces
3.5. Buoyancy Load In Offshore Structures
3.5.1. Installation
3.5.1.1. Jacket structures
3.5.2. Structural Behavior
3.5.2.1. Overall behavior
3.5.3. Reserve Buoyancy
3.5.3.1. Typically, 10-15% for jacket structures
3.6. Ice Loads
3.6.1. Ice Sheets
3.6.2. Moving Ice Sheets
3.6.3. Understanding and Accounting
3.7. Mud Loads
3.7.1. Relevant
3.7.1.1. Platforms near river mouths (shallow water)
3.7.2. River Flow
3.7.2.1. Brings sediment transport and nearby mud towards the platform
3.7.3. Mud Slide
3.7.3.1. May slide through the location