Finite Element Numerical Method for Nonlinear Interaction Response Analysis of Offshore Jacket Affected by Environment Marine Forces

Seyyed Mahmood Ghassemi Zadeh^1*, Reza Shojayee Baghdar², Seyyed Mohammad Saleh Vaziri Kang Olia³

¹Marine Structures Engineering, Amirkabir University of Technology, Tehran, Iran.
²Hydraulic Structures Engineering, Shahrood University, Shahrood, Iran.
³Structure Engineering, Ferdowsi University, Mashhad, Iran.

DOI: 10.4236/ojms.2015.54034                

Abstract

In this paper a nonlinear response of a fixed offshore platform under the combined forces of waves, wind and sea currents is presented. Wave force acting on the elements is calculated using Morison equation. Hydrodynamic loads on horizontal and vertical tubular members and the dynamic response of offshore fixed platform coupled with distribution of displacement, axial force, and bending moment along the base of the platform for regular and severe cases have been investigated. The structure must be able maintain production in a one-year wave return period condition and also to be able to continue with one hundred-year storm return period. The results of this study show that bending moment values with a one-year wave return period condition for the base platform and junction of platform to deck are 70 percent and 59 percent, respectively more than bending moment with a one-year wave return period. The direction of wave and wind hit has significant effects on the shift platform response, also nonlinear response is important for the safe design and operation of offshore structures.

Keywords

Fixed Jacket Platform, Finite Element Method, Stokes Wave Theory, Nonlinear Response of Structure

Conflicts of Interest

The authors declare no conflicts of interest.

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