近海浅滩地区大尺度海上风电筒型基础在风荷载作用下的响应

Response of Large-Scale Bucket Foundation Used in Offshore Wind Turbine in Shoal Areas Under Wind Load

把现场实测的加速度时程转换为实际荷载作用在模型中,把风速时程转化为风荷载,用ABAQUS有限元软件分析了基础和土体在荷载作用下的响应,比较了风荷载和塔架涡激振动等其他因素分别对实际荷载的贡献;主要研究了沉降的发展和基础及周围土体应力在不同时程内的变化,以及加载结束后土体内的等效塑性区等影响区域的情况,通过变化土质参数(土体密度、弹性模量、黏聚力和内摩擦角等),考察了筒型基础在不同土质中荷载作用下的反应情况.研究表明:随着加载的持续,土体中的应力值逐渐增大,基础周围的土体会产生马鞍形的沉降,土体中的等效塑性区产生在基础底部距筒底端约2倍筒高处,土体的强度越大,筒的沉降越小其对周围土体的影响范围也越小.

The acceleration which is measured at scene is converted to the actual load and applied to the model. Wind speed is transformed into wind load, and the response of the foundation and soil under loads is analyzed by finite element software ABAQUS. The contributions to actual loads made by wind loads and other factors such as vortex- induced vibration of tower are compared. Not only the settlement and stress change of soil and foundation under dif- ferent time histories but also the equivalent plastic zone of soil after loading is mainly researched. The response of bucket foundation under wind load in different soil is investigated by changing soil parameters （soil density, modulus, cohesion and internal friction angle etc）. It is shown that with loading continuing, the stress of soil gradu- ally increases, and the soil around the foundation will form concave settlement. The equivalent plastic zone of soil appears in the area about two bucket high away from the bottom of the foundation. The larger the soil strength is, the smaller the settlement of the foundation and the influence area of soil will be.