Course Details
Subject {L-T-P / C} : CE6236 : Design of offshore Structures { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Pradip Sarkar
Syllabus
Types of offshore structures and conceptual development - Analytical models for jacket structures - Materials and their behaviour under static and dynamic loads - Statutory regulations - Allowable stresses - Various design methods and Code Provisions - Design specification of API, DNV, Lloyd's and other classification societies - Construction of jacket and gravity platforms.
Operational loads - Environmental loads due to wind, wave, current and buoyancy - Morison's Equation - Maximum wave force on offshore structure - Concept of Return waves - Principles of Static and dynamic analyses of fixed platforms - Use of approximate methods - Design of structural elements.
Introduction to tubular joints - Possible modes of failure - Eccentric connections and offset connections - Cylindrical and rectangular structural members – In-plane and multi-plane connections - Parameters of in-plane tubular joints - Kuang's formulae - Elastic stress distribution - Punching shear Stress - Overlapping braces - Stress concentration - Chord collapse and ring stiffener spacing - Stiffened tubes - External hydrostatic pressure - Fatigue of tubular joints - Fatigue behaviour - S-N curves - Palmgren-Miner cumulative damage rule - Design of tubular joints as per API Code.
Corrosion - Corrosion mechanism - Types of corrosion - Offshore structure corrosion zones – Biological corrosion - Preventive measures of Corrosion - Principles of cathode protection systems - Sacrificial anode method and impressed current method – Online corrosion monitoring - Corrosion fatigue.
Course Objectives
- To develop the knowledge and skills to carry out basic tasks regarding structural design and dimensioning of marine structures.
Course Outcomes
1. Students will be able to understand the layout of marine structures from functional and safety requirements. <br />2. Students will be able to perform fundamental stability checks of various floating and bottom supported offshore structures.
Essential Reading
- T. H. Dawson, Offshore Structural Engineering, Prentice Hall
- W. J. Graff, Introduction to Offshore Structures, Gulf Publ. Co.
Supplementary Reading
- B. McClelland, M. D. Reifel, Planning & Design of fixed Offshore Platforms, Van Nostrand
- API RP 2A, Planning, Designing and Constructing Fixed Offshore Platforms, API