Application of composite renovation scheme in wind turbines foundation upgrading
Based on the practical need that the existing foundation of the outdated wind turbine cannot withstand the increased load resulting from the improvement and enhancement of the upper structure,a thorough investigation is conducted on the vulnerable aspects of the renovated foundation.Evaluation criteria for the effectiveness of the foundation renovation are established.At the same time,taking the existing ring-type foundation of a wind turbine in a specific wind farm in Hunan province as the research object,a feasibility study is conducted on its expansion,upgrading and transformation.A composite solution incorporating a hoop beam and applying circumferential pressure in the hoop beam region is proposed by conducting numerical analysis to investigate the influence of different circumferential pressure parameters on the mechanical performance of the expanded wind turbine foundation,an optimal combination of circumferential pressure parameters is determined.Subsequently,the dimensions of the hoop beam are further optimized through design.The analysis results indicate that the composite foundation expansion and upgrading scheme consisting of the hoop beam and circumferential pressure increases the contact area between the tower sidewall and the foundation concrete,thereby enhancing their interaction and effectively alleviating the stress on the bottom part of the foundation ring.At the same time,the scheme also reduces displacement,strengthens the coordination between the steel and concrete structures,and enables the foundation to accommodate larger loads from the upper structure,thereby supporting the completion of this expansion and upgrading project.
wind turbinesembedded-ring foundationfinite element analysisconcrete ring beamcircumferential pressureupgrading