Abstract
This chapter discusses spectral fatigue analysis (SFA) and design. In simplified fatigue assessment, the fatigue damage is estimated assuming the long-term stress response follows a Weibull distribution. Fatigue analysis and design include several analysis steps including fatigue screening, detailed structural analysis, and reanalysis of design improvements, welding improvements, combined design and welding improvements, etc. This chapter describes fatigue analysis of floating structures, such as SFA including computer modeling, load conditions, structural analysis and validation, loading combinations, and fatigue damage assessment; time–domain fatigue analysis; and fatigue design of local structural details. This chapter explains that some terms applied in fatigue analysis have specific meanings. This chapter also discusses SFA, including fatigue damage acceptance criteria and fatigue damage calculated using frequency–domain solutions. Time–domain fatigue assessment is also discussed in this chapter. This section presents aspects of modeling, load evaluation, and structural analysis applicable to overall structural analysis. These loading conditions include hydrodynamic loads due to waves, including dynamic pressure, and inertial loads due to motions, etc. Symmetrical or asymmetrical load conditions are checked to confirm analytical results. This chapter also discusses effective fatigue analysis and design.
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