A simplified formula for calculating the limit load of cracked offshore wind turbine monopile under bending

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A simplified methodology is proposed for calculating the plastic collapse (limit) bending moment load of a pipe with a circumferential flaw with an emphasis on its application for use in the assessment of cracked offshore wind turbine monopile using failure assessment diagrams. The proposed methodology is based on the theory of net section collapse (NSC) but differs from existing approaches in that it does not need idealisation and categorisation of the crack before assessment. The proposed methodology is validated against results presented in literature and also finite element analysis results. Although it is possible to obtain limit loads using FE analysis, this is computationally expensive and time consuming. The proposed approach allows for nearinstantaneous calculation of limit load for any arbitrary crack configuration and loading direction. This is a significant development for the analysis of offshore wind turbine monopiles as it
allows the suitability of the cracked structure to be assessed in pseudo-real time.
Original languageEnglish
Article number103164
Number of pages8
JournalMarine Structures
Early online date22 Jan 2022
Publication statusPublished - 31 May 2022


  • net section collapse
  • limit load
  • load ratio
  • failure assessment diagram
  • wind turbine monopile

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