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A simplified formula for calculating the limit load of cracked offshore wind turbine monopile under bending
https://orcid.org/0000-0002-8748-8795
Abstract 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 near-instantaneous 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.
Highlights Evaluation of limit load for large diameter cracked pipes. Evaluation of limit load for offshore wind turbine monopile. Generalisation of net section collapse equations and its application to offshore wind turbine monopile. Evaluation of limit load for arbitrary shaped cracks and its application to offshore wind turbine monopile.
A simplified formula for calculating the limit load of cracked offshore wind turbine monopile under bending
https://orcid.org/0000-0002-8748-8795
Abstract 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 near-instantaneous 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.
Highlights Evaluation of limit load for large diameter cracked pipes. Evaluation of limit load for offshore wind turbine monopile. Generalisation of net section collapse equations and its application to offshore wind turbine monopile. Evaluation of limit load for arbitrary shaped cracks and its application to offshore wind turbine monopile.
A simplified formula for calculating the limit load of cracked offshore wind turbine monopile under bending
https://orcid.org/0000-0002-8748-8795
Abstract 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 near-instantaneous 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.
Highlights Evaluation of limit load for large diameter cracked pipes. Evaluation of limit load for offshore wind turbine monopile. Generalisation of net section collapse equations and its application to offshore wind turbine monopile. Evaluation of limit load for arbitrary shaped cracks and its application to offshore wind turbine monopile.
A simplified formula for calculating the limit load of cracked offshore wind turbine monopile under bending
Fajuyigbe, A. (author) / Brennan, F. (author)
Marine Structures ; 83
2022-01-16
Article (Journal)
Electronic Resource
English
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