Response Spectrum Method for Extreme Wave Loading With Higher Order Components of Drag Force

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Response Spectrum Method for Extreme Wave Loading With Higher Order Components of Drag Force

Tabeshpour Mohammad Reza1*, Fatemi Dezfouli Mani2, Dastan Diznab Mohammad Ali1,

Mohajernasab Saied1 and Seif Mohammad Saied1

1. Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering Department,

Sharif University of Technology, Tehran, Iran

2. Department of Marine Industries, Science and Research Branch, Islamic Azad University, Tehran, Iran

 

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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