复合加载模式下海上风机圆形浅基础亚塑性宏单元模型

海上风机基础不但承受着上部结构传来的竖向荷载、风浪等引起的水平荷载与弯矩，还承受着叶片等旋转机构传来的扭矩。基于亚塑性本构理论框架，引入相应的圆形浅基础广义屈服面函数及塑性势函数，构建了一个六自由度复合加载模式下砂土地基上海上风机基础宏单元模型。为了能够合理描述循环加载条件下基础的宏观力学响应，该模型将等效粒间应变概念引入到广义力与其对应位移关系中。通过对已有模型试验结果的数值模拟，在一定程度上验证了提出的宏单元模型的合理性。

A Hypoplastic Macro-Element Model for Circular Shallow Foundations of Offshore Wind Turbines Under Combined Loading

The foundation for offshore wind turbines is subjected to vertical loading caused by structural weight and horizontal loading and moment due to wind- or wave-induced loading. Furthermore, it sustains torque from rotor blades. Based on the framework of hypoplasticity theory, the available general yield function and plastic potential function, a macro-element model for circular shallow foundations on sands under six-degree-of-freedom combined loading has been developed. In this model, to correctly reproduce the mechanical response of offshore foundations under cyclic loading, the concept of equivalent inter-granular strain is introduced into the relationship of generalized forces as well as its corresponding displacements. The performance of the proposed macro-element model is demonstrated by comparing the model predictions with available experimental data from a series of model tests.