Journal of Marine Science and Application

, Volume 16, Issue 1, pp 27–32 | Cite as

Response spectrum method for extreme wave loading with higher order components of drag force

  • Tabeshpour Mohammad Reza
  • Fatemi Dezfouli Mani
  • Dastan Diznab Mohammad Ali
  • Mohajernasab Saied
  • Seif Mohammad Saied
Article

Abstract

Response spectra of fixed offshore structures impacted by extreme waves are investigated based on the higher order components of the nonlinear drag force. In this way, steel jacket platforms are simplified as a mass attached to a light cantilever cylinder and their corresponding deformation response spectra are estimated by utilizing a generalized single degree of freedom system. Based on the wave data recorded in the Persian Gulf region, extreme wave loading conditions corresponding to different return periods are exerted on the offshore structures. Accordingly, the effect of the higher order components of the drag force is considered and compared to the linearized state for different sea surface levels. When the fundamental period of the offshore structure is about one third of the main period of wave loading, the results indicate the linearized drag term is not capable of achieving a reliable deformation response spectrum.

Keywords

offshore structure design response spectrum method wave analysis Morison equation higher order components drag force wave loading extreme wave 

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Copyright information

© Harbin Engineering University and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Tabeshpour Mohammad Reza
    • 1
  • Fatemi Dezfouli Mani
    • 2
  • Dastan Diznab Mohammad Ali
    • 1
  • Mohajernasab Saied
    • 1
  • Seif Mohammad Saied
    • 1
  1. 1.Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering DepartmentSharif University of TechnologyTehranIran
  2. 2.Department of Marine Industries, Science and Research BranchIslamic Azad UniversityTehranIran

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