摘要
为了保证海上风机桩的安全性与稳定性,基于流固耦合原理对海上风机桩基础受力性能进行分析。根据动量守恒定量构建海水域控制方程,采用流固耦合原理设计风机桩和海水交界耦合控制方程,通过Adina-STRUCTURE模块分析海水对风机桩基础受力性能的影响,构建海上风机桩有限元模型,模拟不同海水体积、流速、桩半径情况下,以及在风、波浪和二者共同作用下,机桩基础受力性能。试验结果表明,海水的体积与最大应力及桩顶最大位移变化成反比,当海水体积是风机桩基础体积6倍以上时,最大应力和桩顶最大位移降低程度随海水体积增大而减小;随着海水流体入口速度的增加,机桩基础的最大应力和桩顶的最大位移不断增加;风机桩基础半径由0.4 m增加到3.2 m,机桩基础最大应力和机桩桩顶最大位移分别由0.79 MPa降低到0.61 MPa、由0.89 mm降低到0.44 mm,且风电机组桩腿基础半径变化对桩顶最大位移的影响大于对最大应力的影响;风速、波浪有效波高及周期的增加,导致风机的桩基最大载荷及桩顶最大位移逐渐增加,风和波浪的共同作用会增加基础的最大载荷和桩顶最大位移。
To ensure the safety and stability of offshore fan pile,the stress performance of offshore wind turbine piles is analyzed based on the principle of fluid-structure interaction.According to the conservation of momentum,the control equation of sea water is constructed,and the coupling control equation of wind turbine pile and seawater junction is designed by using the principle of fluid-structure interaction.The influence of seawater on the stress performance of the wind turbine pile foundation was analyzed by the Adina-STRUCTURE module,and the finite element model of the offshore wind turbine pile is constructed.The mechanical performance of the machine-stake foundation is simulated under different sea water volume,velocity,radius of the stake,wind,wave and both.The test results show that the volume of sea water is inversely proportional to the change of maximum stress and maximum displacement of pile top.When the volume of sea water is more than 6 times the volume of fan pile foundation,the decrease of maximum stress and maximum displacement of pile top decreases with the increase of sea water volume.With the increase of seawater fluid inlet speed,the maximum stress of machine-stake foundation and the maximum displacement of the top of the stake increase continuously.The radius of the fan stake foundation increased from 0.4 m to 3.2 m,the maximum stress of the machine stake foundation and the maximum displacement of the top of the machine stake decreased from 0.79 MPa to 0.61 MPa and from 0.89 mm to 0.44 mm,respectively.The change of the radius of the wind turbine stake leg foundation has a greater influence on the maximum displacement of the stake top than on the maximum stress.The increase of wind speed and wave effective wave height and period will gradually increase the maximum load on the pile foundation and the maximum displacement on the top of the pile.The combined action of wind and wave will increase the maximum load on the foundation and the maximum displacement on the top of the pile.
作者
王安庆
WANG Anqing(China Electric Power Research Institute Co.,Ltd.,Beijing 100082,China)
出处
《电工技术》
2022年第23期19-23,共5页
Electric Engineering
关键词
流固耦合
质量守恒
动量守恒
有限元模型
边界条件
机桩基础应力
fluid structure interaction
conservation of mass
conservation of momentum
finite element model
boundary conditions
stress of machine pile foundation
