Jacket형 해양구조물(海洋構造物)의 비선형(非線形) 동적응답해석(動的應答解析)

Nonlinear Analysis of Dynamic Response of Jacket Type Offshore Structures

  • 김용철 (한국기계연구소 대덕선박분소) ;
  • 노인식 (한국기계연구소 대덕선박분소) ;
  • 박성식 (한국기계연구소 대덕선박분소)
  • 발행 : 1986.06.01

초록

In the present paper, the nonlinear analysis of dynamic response of the jacket type offshore structures subject to nonlinear fluid force is performed. Furthermore, several analysis methods, such as quasi-static analysis, Newmark-$\beta$ method and state vector time integration technique, and described and compared with each others in order to investigate the efficiency numerical of the schemes for this kind of nonlinear structural analysis. In the problem formulation, various environmental forces acting on the jacket type offshore structure have been studied and calculated. Particularly, hydrodynamic forces are calculated by using the Morison type formula, which contains the interaction effect between the motion of the structure and the velocity of fluid particles. Also, Stokes' 5th order wave theory and Airy's linear wave theory are used to predict the velocity distribution of the fluid particles. Finally, the nonlinear equation of motion of the structure is obtained by using three-dimensional finite element formulation. Based on the above procedures, two examples, i.e. a single pile and a typical offshore jacket platform, are studied in details.

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