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Definition of Performance Levels and Risk Level of Fixed Offshore Platform

Rashvand, Mohammad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48336 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Golafshani, Ali Akbar
  7. Abstract:
  8. Offshore platforms are one of the most important structures in oil-rich countries, so that their economic benefit makes it very expensive to stop their usage. Therefore, it is essential that their performance is not disrupted by earthquake or the tidal waves made by severe storms. According to statistics many of the offshore platforms of their design life pass and need an important loss inspection. The assessment of existing platforms is a relatively new process. The lack of comprehensive standard creates some difficulty in establishing performance requirements, on a case by case basis depending upon the risks associated with the future operations of the platform. In this study the criteria and methodology for structural seismic assessment between API standard and ASCE 41-06 standard document for buildings has been compared. The first step in evaluating topics is performance based parameters that define modeling plastic joints. In this study, modeling parameters using hysteresis curves were obtained every member of tubular platform and The values provided by the structural Prestandard such as Fema 356 and ASCE 41-06 standard were compared. A comparison of the way that the existing regulations on the basis of any diameter or thickness slenderness ratio presented modeling parameters that were incomplete and Global and Local Buckling effect at the same time must be considered. It was concluded that the criteria and methodology of the offshore structure standard for seismic assessment can be improved and method of ASCE 41-06 that have details for correct evaluation of members’ capacity, can be used for offshore platforms. In the next section to define performance levels under the load of a incremental wave analysis a technique called nonlinear behavior better than the static method will show you was introduced
  9. Keywords:
  10. Fixed Offshore Platform ; Offshore Assessment Platforms ; Earthquake Load ; Performance Levels ; Incremental Wave Analysis ; Wave Loading

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