Nonlinear response of fixed jacket offshore platform under structural and wave loads

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Nonlinear response of fixed jacket offshore platform under structural and wave loads

Author: Shehata E. Abdel Raheem | Size: 6.3 MB | Format: PDF | Quality: Unspecified | Publisher: Coupled Systems Mechanics, Vol. 2, No. 1 (2013) 111-126 | Year: 2013 | pages: 16

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 (veloc
ity 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 fixedoffshore structure together with th e distribution of displacement, axial force and bending moment along the leg are investigated for regular and extreme cond
itions, 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.

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