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

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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.

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Authors and Affiliations

  1. Center of Excellence in Hydrodynamics and Dynamics of Marine Vehicles, Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran

    Tabeshpour Mohammad Reza, Dastan Diznab Mohammad Ali, Mohajernasab Saied & Seif Mohammad Saied

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

    Fatemi Dezfouli Mani

Authors
  1. Tabeshpour Mohammad Reza
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  2. Fatemi Dezfouli Mani
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  3. Dastan Diznab Mohammad Ali
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  4. Mohajernasab Saied
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  5. Seif Mohammad Saied
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Correspondence to Tabeshpour Mohammad Reza.

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Reza, T.M., Mani, F.D., Ali, D.D.M. et al. Response spectrum method for extreme wave loading with higher order components of drag force. J. Marine. Sci. Appl. 16, 27–32 (2017). https://doi.org/10.1007/s11804-017-1397-7

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  • DOI: https://doi.org/10.1007/s11804-017-1397-7

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