摘要
海上风力机与船舶碰撞概率随着海上风电场建设而逐渐增加。为此,基于非线性动力学理论,采用LS-Dyna模拟4 MW海上风力机单立柱三桩基础受船舶碰撞的过程,对比p-y曲线法和固定底端约束法,研究桩柱能量转换、水平位移与土层深度关系、接触力、剪切力及应力应变关系。结果表明:较之固定底端约束法,p-y曲线法中桩柱受船舶碰撞能量转换迅速;固定底端约束法下船舶碰撞海上风力机基础,其钢管柱底端更易遭受破坏;土层由浅至深,三根钢管柱水平位移逐渐减小,土层对桩结构稳定性影响最大的是浅层土,改善浅层土体性质可有效提高桩体安全;船舶质量增加,单立柱三桩基础所受接触力、剪切力增加;p-y曲线法与固定底端约束下产生的接触力差值随着船舶质量增加而增加,剪切力差值随着船舶质量增加而减小。
The probability of collisions between offshore wind turbines and ships increases with the development of offshore wind farm.Based on nonlinear dynamic analysis method,through LS-DYNA to simulate the ship impact a 4 MW offshore wind turbine tripod,the paper compare p-y curve method and fixed bottom end constraint.The author has a comparison and analysis of energy conversion、maximum collision force、relationship of horizontal displacement and depth of soil、contact force、shear force and stress-strain.The results show that energy conversion of the pie column under the p-y curve is faster than that under the fixed bottom end restraint;the bottom end of the steel pipe column is more susceptible to be damaged when a ship impacts offshore wind turbine foundation under the fixed bottom end restraint method;the soil layer is from shallow to deep,in which shallow soil has the most influence on the stability of the pile and the horizontal displacement of three steel column gradually decreases,the improvement of the properties of the shallow soil can effectively improve the safety of the pile;the increase of the ship quality,the contact force and shear force are increasing;the difference in contact force between the curve method and the fixed bottom end constraint increases with the increase of the quality of the ship,and the shear force difference decreases.
作者
韩志伟
周红杰
李春
丁勤卫
HAN ZhiWei;ZHOU HongJie;LI Chun;DING QinWei(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《机械强度》
CAS
CSCD
北大核心
2020年第2期384-391,共8页
Journal of Mechanical Strength
基金
国家自然科学基金项目(51676131,51811530315,51176129)资助。
