The Effect of Nonlinear Drag PSD on Fatigue of Compliant Offshore Structures

by Jin Wang, Bechtel Corp, Houston, United States,
Loren D. Lutes, Bechtel Corp, Houston, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract: Structural fatigue damage induced by random ocean wave loading on a compliant type of offshore structure is considered. The nonlinear wave force is modeled by the Morison equation and its effect on fatigue is investigated using an appropriate PSD in the frequency domain. It is shown that the nonlinear drag effect on PSD is very significant for compliant offshore structures. Fatigue damage predictions using nonlinear and linearized wave force PSD's are compared with time domain simulation.

Subject Headings: Offshore structures | Fatigue (material) | Nonlinear waves | Ocean waves | Wave forces | Power spectral density | Nonlinear response

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