Effect of High Frequency Response on Fatigue of Offshore Structuresby Shahram Sarkani, George Washington Univ, United States,
Abstract: Welded steel specimens have been tested under several loading spectra to determine the effect on fatigue life of high frequency components in the psd of the stress or strain in the joint. A standard Gaussian simulation technique is used to generate the load time history for a specimen from a given psd, which represents the dynamic response of a prototype structure. The experimental results indicate that the addition of a high frequency component can reduce the fatigue life substantially. The experimental results are also compared with commonly used analytical procedures such as the Rayleigh approximation, rainflow analysis and the peak counting method.
Subject Headings: Offshore structures | Approximation methods | Steel structures | Fatigue life | Lifeline systems | Power spectral density | Stress strain relations | Dynamic loads
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