Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Calibration of Design Fatigue Factors for Offshore Wind Turbine Support Structure Based on Fatigue Test Database

Version 1 : Received: 2 September 2020 / Approved: 4 September 2020 / Online: 4 September 2020 (11:00:22 CEST)

How to cite: Zhao, W.; Hsu, W. Calibration of Design Fatigue Factors for Offshore Wind Turbine Support Structure Based on Fatigue Test Database. Preprints 2020, 2020090095 (doi: 10.20944/preprints202009.0095.v1). Zhao, W.; Hsu, W. Calibration of Design Fatigue Factors for Offshore Wind Turbine Support Structure Based on Fatigue Test Database. Preprints 2020, 2020090095 (doi: 10.20944/preprints202009.0095.v1).

Abstract

The concept of Design Fatigue Factors (DFFs) was introduced for providing desired level of safety in structural fatigue design, often associated with damage calculated from S-N curves. Calculation of fatigue damage from S-N curves can be affected by multiple factors, e.g. types of weld class, corrosion condition, loading conditions, stress concentration on different geometries etc. Each of them can be subject to different level of uncertainties. This study intends to recalibrate the DFFs from a detailed reliability analysis by investigating the probabilistic models derived from the database of S-N curves that has been most frequently used in offshore wind industry. The results of such study indicate that the DFFs can be reduced substantially for the corrosive environmental fatigue models from current standards to the same level of target reliability.

Subject Areas

fatigue; design fatigue factor; offshore wind turbine foundation; corrosion fatigue; target reliability

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