Loading...

Developing Dynamic Increasing Amplitude and Period (DIAP)Method for Evaluation of Offshore Structures

Jahanmard, Vahid Reza | 2014

643 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46258 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Tabeshpour, Mohammad Reza; Dastan Diznab, Mohammad Ali
  7. Abstract:
  8. In this study, Wave Endurance Time (WET) is introduced as an applicable method for assessment of offshore structures under extreme waves. In this method, artificial records called Wave Functions (WFs) are used instead of usual extreme wave records. WFs are designed so that their excitations gradually increase with time. Therefore, one WF can be replaced by a large number of sea surface records with different excitation levels. The main advantage of proposed method is that it assesses the structural performance under various extreme waves with low computational cost especially in comparison with three-hour simulasions. Moreover, reliability of structures can be evaluated based on the time that the structural response is still acceptable.
    To achieve these goals, wide studies have been done about random and irregular sea waves, and according to nature of the waves, proposed procedure is presented to generate artificial record of Wave Functions. For considering the accuracy of this method in estimation of structural response, two structural states (MDOF and FEM) are investigated against Persian Gulf waves. In these models, Engineering Demand Parameters (EDPs) in WET approach and three-hour simulations are compared to each other. The results of these studies indicate that WET is a convenient method to estimate the structural response with less computational effort and acceptable accuracy.
  9. Keywords:
  10. Wave Function ; Dynamic Analysis ; Extreme Waves ; Offshore Structures ; Offshore Platforms ; Wave Endurance Time

 Digital Object List

 Bookmark

No TOC