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A New Method for Assessment of Fixed Offshore Platforms under Wave Load

Mohajernassab, Saeed | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44848 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed; Tabeshpour, Mohammad Reza
  7. Abstract:
  8. Nowadays, according to existence of oil resources in offshore areas and the necessity of extracting, constructing of offshore platforms is developed. The design of these structures has high effect on the cost of construction and maintenance and the performance under the loads such as wave, earthquake, impact, etc. Therefore, if the analysis of platform structure is more accurate the evaluation of the behavior and consequently the better design in different conditions is better. In this thesis, a modification of Endurance Wave Analysis (EWA) in evaluation of offshore structures is introduced in this study. EWA is a new method to predict the response of offshore structures in different sea states by stepwisely intensifying records. In presented Modified Endurance Wave Analysis (MEWA), a practical methodology for selecting time duration and increasing trend of the records is addressed. Generation procedure is described based on three practical wave theories: random wave theory, new-wave theory and constrained new-wave theory. Also, generation of the desired records is done based on the Persian Gulf wave records. In addition, the assessment of a simplified model of a realistic fixed offshore platform (Ressalat platform) under the extreme wave conditions is viewed through the lens of a MEWA study. A comparative analysis of MEWA, EWA and 3-hour random wave simulation has been also carried out to investigate the accuracy and the time demanding. Several statitical distributions are considered for fitting the responses. The results indicate that the MEWA is very effective for the dynamic analysis and assessment of offshore structures subjected to sea loads. Also, it is a time-saving andconvenient method both in design and assessment of offshore platforms rather than EWA
  9. Keywords:
  10. Modified Endurance Wave Analysis ; Fixed Offshore Platform ; Extreme Waves ; Offshore Assessment Platforms

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