The dynamics of steel offshore structures with respect to fatigue is described, expounding the basic ideas underlying the approach to design and analysis. Fatiguing due to both wind and ocean wave has been treated with particular reference to the latter. Both spectral and deterministic approaches to design have been presented, emphasising the importance of cross-spectra. Fatigue analysis of offshore structures using the concept of damage intensity variation with applied wave height is described, developed and discussed. Both linear and nonlinear systems behaviour have been assessed. Concise analytical expressions enabling the determination of fatigue durability from the premises of applied power spectral density and structural dynamic response have been presented. Endurance limit deductions are included. Both approaches, Damage summation - Palmgren-Miner and Crack propagation - Fracture Mechanics, have received attention. A brief discussion of the methodology of prediction and the validity of the applicability of theory to practice follows. Analytical concepts of prediction require sufficient corroboration in reality to be of use in application. Complete sets of observable dynamical effects must be comprehensively represented in a truly causal analytical formula of prediction. These necessary requirements, it is believed, would be sufficiently met in the methodology presented.
Fatigue dynamics and design
Dauerschwingfestigkeit und Konstruktion
1983
28 Seiten, 7 Bilder, 13 Quellen
Conference paper
English
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