Peak response of offshore structures to wave and current forces
The differential equations governing the motion of an offshore structure subjected to Morrison wave loads are nonlinear. The solution of these equations is generally based on approximate methods, such as statistical linearization. This work develops methods for estimating the quasi-static and dynamic peak responses of offshore structures subjected to wave forces. Response descriptors such as mean upcrossing rates and average peak responses are obtained for the quasi-static response by point crossing formula and vector-crossing analysis. The peak desciptors for the dynamic response are obtained by Monte-Carlo simulation and time discretization methods. The Monte-Carlo simulation developed here uses the FFT technique and is computationally efficient. It can account for the spatial correlation of the wave forces. In the method of time discretization, the wave load is discretized in time and represented as an independent sequence. The methods are applied to the analysis of two offshore platforms; a Tension Leg Platform and a Tower Platform.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 5424070
- Country of Publication:
- United States
- Language:
- English
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DIFFERENTIAL EQUATIONS
DYNAMIC LOADS
EQUATIONS
MONTE CARLO METHOD
NONLINEAR PROBLEMS
OFFSHORE PLATFORMS
WAVE FORCES