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Sensitivity Analysis of Rehabilitation Options the Existing Platform

Beyginaloo, Mohammad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57216 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza
  7. Abstract:
  8. Nowadays, offshore platforms are widely used for drilling and extraction. in the Persian Gulf due to the shallow depth Water in this area is commonly used from the offshore platforms of Jacket. Most of the structures built in the Persian Gulf They are designed for a useful life of 20-30 years. Many structures that are in operation in Iran have passed their useful life and require more rounds of inspections and the management of the integrity of the structural (SIM) to determine the adequacy of the structural capacity, and after Inspections, if needed, the structure will enter the stage of repair, rehabilitation and strengthening.The API standard is one of the most common The standards for evaluating platforms are jacket.One of the most important issues in Iran's offshore industry is rehabilitation and strengthening The members of the offshore platforms are jacketed against the environmental loads of waves, wind, currents and earthquakes. members of offshore platforms due to corrosion, Fatigue caused by wave load, floating impact and buckling of members against environmental loads, etc. be. Getting to know the types of damages in the members of offshore platforms and the various methods of improving the members of highly damaged platforms It is important. Usually, many employers refuse to design and build new platforms due to high economic costs They do and prefer to improve the existing platforms. Studying and understanding different methods of improving platforms Offshore, due to the large amount of failures of jacket offshore platforms in Iran, it is very useful for increase the performance of these platforms It will be that in this research. In this research, we investigate and analyze four rehabilitation methods,buckling restrained brace, concrete filled tube, replacement of braces and clamp. In addition, considerations related to computer simulation and analysis of capacity determination have been carried out in a comparative manner, and the sensitivity of the system to each of the methods has been examined that ,buckling restrained brace in terms of ultimate strength and clamp in terms of ductility show better performance compared to other methods. . Considering that the members filled with concrete have the best performance in terms of ultimate strength and ductility, respectively, after the buckling restrained brace and clamp methods and because they are less expensive than other methods from an economic point of view, it can be the most ideal method to improve the existing structure
  9. Keywords:
  10. Jacket-type Offshore Platforms ; Structural Integrity Management ; Fatigue ; Corrosion ; Reserve Strength Ratio (RSR) ; Sensitivity Analysis ; Offshore Platforms

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