Author(s): G. I. Schuëller

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Abstract: Two sources of uncertainties to be considered when computing spectral densities of wind-generated wave forces are discussed. The size of resolution and degree of confidence of spectral estimates as well as the filtering process are found to be important for the spectral shape particularly in the subrange significant for structural design of dynamically excited linear systems. The second type of uncertainty is introduced by the fact that the coefficients of drag and inertia are random variables. The effect of their dispersion on the variation of the force spectral estimate in terms of exceedance probabilities of the dynamic wave loads - using similarity wave height spectra - is discussed. The analysis is illustrated utilizing a template steel platform in 550 ft of water as a sample structure.

DOI: https://doi.org/10.1080/00221687609499670

Year: 1976