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Coupled Systems Mechanics
  Volume 2, Number 1, March 2013, pages 111-126

Nonlinear response of fixed jacket offshore platform under structural and wave loads
Shehata E. Abdel Raheem

Abstract     [Full Text]
    The structural design requirements of an offshore platform subjected to wave induced forces and moments in the jacket can play a major role in the design of the offshore structures. For an economic and reliable design; good estimation of wave loadings are essential. A nonlinear response analysis of a fixed offshore platform under structural and wave loading is presented, the structure is discretized using the finite element method, wave plus current kinematics (velocity and acceleration fields) are generated using 5th order Stokes wave theory, the wave force acting on the member is calculated using Morison\'s equation. Hydrodynamic loading on horizontal and vertical tubular members and the dynamic response of fixed offshore structure together with the distribution of displacement, axial force and bending moment along the leg are investigated for regular and extreme conditions, where the structure should keep production capability in conditions of the 1-yr return period wave and must be able to survive the 100-yr return period storm conditions. The result of the study shows that the nonlinear response investigation is quite crucial for safe design and operation of offshore platform.
Key Words
    finite elements; fixed offshore platform; nonlinear response; wave-structure interaction
Shehata E. Abdel Raheem : Taibah University, Medina, Saudi Arabia, Civil Engineering Department, Faculty of Engineering, Assiut University, Egypt

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