Abstract
This chapter discusses simplified fatigue assessment. Fatigue assessment of structural connections is one of the most critical issues in the design of marine structures such as ships, fixed platforms, floating structures, pipelines, risers, and mooring lines. The results of fatigue assessment are influenced by several aspects of cost and safety, including the quality of connection materials, quality of welding fabrication, frequency of inspections and repairs, consequences of potential fatigue failure, and residual strength of partially damaged structural systems. This chapter describes a simplified procedure for fatigue assessment based on a two-parameter Weibull distribution. The Weibull shape parameter depends on the wave climate and the character of the structural response, especially the possible influence of structural dynamics. Cracks around cutout openings are seen often in many types of ship structures. Past studies have concluded that single-hull tankers experience most of this cracking in side shell and bottom shell areas because of cyclic wave pressure. The chapter discusses simplified fatigue assessment, including calculation of accumulated damage, Weibull stress distribution parameters, simplified fatigue assessment for bilinear S–N curves, and design criteria for connections around cutout openings.
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