Abstract
This paper presents a spectral fatigue damage calcualation on offshore structures subjected to non-narrow banded Gaussian stress processes. The calculation is based on use of the Palmgren-Miner's rule and a multilinear S-N fatigue model. In the calculation, an equivalent stress range, which is defined as dependent on the absolute value of stress maxima and a parameter, is used. This parameter is calculated in terms of the spectral bandwidth measure of the stress process and the slope of the S-N line used. For this purpose, the rainflow cycle counting algorithm and the Monte-Carlo procedure are used to determine stress ranges and cycles from time simulations of a number of stress spectra of a monopod structure. A relation between the equivalent stress range parameter and the commonly known damage correction factor is constructed. Cumulative damage arising during a sea state and in a long-term period is presented.
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