Stochastic dynamic response of fixed offshore structures
The dynamic response of fixed offshore platforms subjected to random wave loading has been determined. A model of stochastic linearization is utilized along with finite element analysis of the structural system. Specific formulae for hysteretic actions are developed to establish dynamic equations of motion. Wave loading is considered as a stochastic process, with the force on a pile being evaluated via the Morison equation. An iterative solution model is given. The response statistics evaluated include autospectral density of deck displacement and displacement-velocity covariance as functions of white noise excitation level. The analysis procedure is exemplified by selecting offshore platforms of the jacket type in moderate water depth and evaluating the various response statistics. The results indicate that hysteresis effects are significant.
- Research Organization:
- Illinois Inst. of Tech., Chicago, IL (USA)
- OSTI ID:
- 5234872
- Country of Publication:
- United States
- Language:
- English
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