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Structural reliability of offshore platforms considering fatigue damage and different failure scenarios

Gholizad, A ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.oceaneng.2012.01.033
  3. Publisher: 2012
  4. Abstract:
  5. Structural systems will normally fail as a consequence of a chain of different components failure es. In this paper, fatigue reliability of fixed offshore platforms is investigated by analyzing different failure scenarios. In order to evaluate the occurrence probability of a special scenario, it is divided into a finite number of sub-scenarios. All combinations of time sequences are generated for a given sequence of failures, using a specially developed program. In order to calculate the occurrence probability of each scenario, a massive reliability analysis should be done for each of corresponding sub-scenarios. A large number of sub-scenarios should be analyzed, therefore implementing time consuming traditional methods for evaluating fatigue reliability may be unrealistic, and a simplified and accurate method is required. Herein, an Artificial transfer function is used to calculate the cumulative fatigue degradation in components. The preciseness of the proposed method is evaluated using a numerical model, and then, it is used to calculate the occurrence probability of each sub-scenario. Based on the calculated values, probability of occurrence is obtained for each scenario, and finally, the failure probability of entire system is calculated. The proposed method can be used in inspection planning and evaluating the life extension of existing offshore platforms
  6. Keywords:
  7. Artificial transfer function ; Failure scenario ; Structural reliability ; Artificial transfer ; Calculated values ; Cumulative fatigue ; Entire system ; Failure Probability ; Fatigue reliability ; Finite number ; Fixed offshore platforms ; Inspection planning ; Occurrence probability ; Probability of occurrence ; Structural systems ; Time sequences ; Drilling platforms ; Fatigue damage ; Offshore structures ; Transfer functions ; Accuracy assessment ; Failure analysis ; Fatigue ; Numerical model ; Offshore structure ; Probability ; Reliability analysis
  8. Source: Ocean Engineering ; Volume 46 , June , 2012 , Pages 1-8 ; 00298018 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0029801812000662