TITLE:
Finite Element Numerical Method for Nonlinear Interaction Response Analysis of Offshore Jacket Affected by Environment Marine Forces
AUTHORS:
Seyyed Mahmood Ghassemi Zadeh, Reza Shojayee Baghdar, Seyyed Mohammad Saleh Vaziri Kang Olia
KEYWORDS:
Fixed Jacket Platform, Finite Element Method, Stokes Wave Theory, Nonlinear Response of Structure
JOURNAL NAME:
Open Journal of Marine Science,
Vol.5 No.4,
October
21,
2015
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.