【摘要】 针对海上风机三筒基础在循环荷载长期作用下的性能问题，文章建立了考虑随动硬化本构的三筒基础-土相互作用有限元模型，系统探讨了不同循环荷载参数对基础动力响应的影响规律。通过7种典型工况的对比，发现：单向循环荷载作用下，基础累积变形与荷载峰、谷值差呈3～4次方线性关系，幂指数大小与荷载幅值相关；双向循环荷载作用下，基础整体沉降与差异沉降显著增大，当荷载峰、谷绝对值相等时，累积沉降量较单向工况增幅达394%。研究揭示了多筒协同承载机制下，土体循环弱化效应导致的基础整体刚度退化规律，可为该类基础在循环荷载作用下的优化设计提供理论依据。更多还原

【Abstract】 Regarding the performance of offshore wind turbine triple-bucket foundations under long-term cyclic loading, this paper establishes a finite element model for soil-triple bucket foundation interaction that incorporates a kinematic hardening constitutive model. It systematically investigates the influence patterns of different cyclic loading parameters on the dynamic response of the foundation. A comparative study of seven typical working conditions revealed that under one-way cyclic loading, the accumulation of deformation exhibits a 3 rd to 4 th power linear relationship with the difference between the peak and valley values of the load, and the magnitude of the power exponent is related to the load amplitude. In contrast, under two-way cyclic loading,both the overall settlement and differential settlement of the foundation increase significantly.Particularly when the absolute values of the load peaks and valleys are equal, the cumulative settlement amount increases by 394% compared to the one-way loading condition. Furthermore,the research elucidates the degradation of the foundation’s overall stiffness resulting from the cyclic softening effect of the soil under the multi-bucket bearing mechanism. These findings provide theoretical support for the optimal design of such foundations under cyclic loading.更多还原