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Fatigue Life Evaluation of Critical Components of Floating Offshore Renewable Energy Supporting Structure
  • R. Hemanth kumar,
  • S. Vishnuvardhan,
  • Venkat Lute
R. Hemanth kumar
Gayatri Vidya Parishad College of Engineering
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S. Vishnuvardhan
Structural Engineering Research Centre CSIR
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Venkat Lute
Gayatri Vidya Parishad College of Engineering

Corresponding Author:[email protected]

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Offshore platforms are used for many functions such as oil and gas production, renewable energies, navigation, ship loading and unloading. Nowadays, the focus on renewable energies is increasing, hence there is need of robust design such structure which will function effectively to carry out the required function. The effect of wind and wave current can cause fatigue load on these structures. In such scenario, the joints of the offshore structure are more vulnerable to fatigue loading. Therefore, in the present research work, fatigue life evaluation of critical component of a floating wind turbine semi-submersible structure is considered. A few researchers have done work on semi-submersible floating offshore wind turbine for fatigue life evaluation. Pontoons and cross braces are the critical components of the entire substructure. Pontoons and cross braces of a 5MW wind turbine floating structure is considered for fatigue life evaluation. The substructure is modelled in Finite element software (ABAQUS V-2020). Tension and compressive load coming from wind, wave current and operational loads are considered. Stress concentration factor (SCF) for all the components is evaluated for three load cases. It is revealed that load case-1 caused the highest SCF in cross bracing. The member which has highest SCF is identified among nine connecting members of the substructure. Once the critical member is identified by highest SCF, then the cyclic load is applied for the critical member. For the member having maximum SCF and evaluated for fatigue life based on maximum stress.