以广东某深远海域大容量风电机组五连筒导管架基础为研究对象,采用有限元软件对五连筒基础在倾斜率、极限承载力和屈曲特性等方面开展深入研究,并对筒顶处导管架与基础连接节点进行多参数敏感性分析,从而得到受力及承载最优的结构体型。研究结果表明：满足相同容量机组荷载运行要求的前提下,五连筒基础与单筒基础结构相比,前者在倾斜率、承载力及抗屈曲特性上优势明显;随着筒顶节点的外移,筒型基础边筒竖向变形逐渐增大,中筒则相反;当筒顶节点靠近中筒时,主要由中筒受力,应力最大部位主要集中在边筒和中筒筒裙底部连接处;当筒顶节点向外偏移时,受力部位由中筒转移到边筒,且应力最大部位转移到沿加载方向的边筒筒裙顶部;基础的极限承载力均随导管架根部开度增加呈线性趋势增长,在水平及弯矩荷载分别作用下,旋转中心附近的被动土压力受筒顶节点位置影响较大,筒顶节点越往外偏移,被动土压力越小;旋转中心以下的主动土压力受筒顶节点位置影响同样较大,筒顶节点越往外偏移,主动土压力越大。
Abstract
The research focuses on a five-bucket jacket foundation that used for a large wind turbine in a far-reaching sea area in Guangdong. The finite element software was used to carry out on the tilt rate, ultimate bearing capacity and buckling characteristics of the bucket. And the multi-parameter sensitivity analysis was carried out on the nodes at the top of the bucket to obtain the optimal structural. It is found that the five-bucket foundation has obvious advantages compared with the single-bucket foundation in the following parts. When the top nodes are close to the middle bucket, the stress is mainly exerted by the middle bucket, and the maximum stress is mainly concentrated at the joint of the side bucket and the bottom of the middle bucket skirt. When the top nodes of the bucket shift outward, the stress is transferred from the middle bucket to the side bucket, and the maximum stress is transferred to the top of the side bucket skirt along the loading direction.The ultimate bearing capacity of the foundation increases linearly with the increase of the opening of the jacket root. Under the horizontal load and the bending moment load respectively, the passive earth pressure near the center of rotation is greatly affected by the bucket top nodes. The more the top nodes deviates, the smaller the passive earth pressure becomes. The active earth pressure below the center of rotation is greatly affected by the bucket top nodes, and the more the top nodes is shifted outward, the greater the active earth pressure will be.
关键词
海上风电 /
应力分析 /
承载力 /
五连筒基础 /
筒顶节点
Key words
offshore wind /
power stress analysis /
bearing capacity /
five-bucket structure /
bucket top node
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