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This part of IEC 61400 specifies requirements and general principles to be used in assessing the structural integrity of wind turbine support structures (including both onshore and offshore above the splash zone and onshore foundations). The scope includes the geotechnical assessment of the soil for generic or site specific purposes. The strength of any flange and connection system connected to the rotor nacelle assembly (including connection to the yaw bearing) are designed and documented according to this document or according to IEC 61400-1:2019. The scope includes all life cycle issues that may affect the structural integrity such as assembly and maintenance.
The assessment assumes that load data has been derived as defined in IEC 61400-1:2019 or IEC 61400-2 and IEC 61400-3-1:2019 or IEC 61400-3-2:2025 and using the implicit reliability level and partial safety factors for loads.
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