海上风力机大直径单桩数值模拟对比分析  

Numerical Simulation Comparative Analysis of Large Diameter Pile for Offshore Wind Turbine

作　　者：张灵熙 蔡新[1,2] 潘盼[1] 朱杰[1] 舒超[1] 

机构地区：[1]河海大学力学与材料学院,南京210098 [2]河海大学水利水电学院,南京210098

出　　处：《三峡大学学报（自然科学版）》2015年第2期51-54,共4页Journal of China Three Gorges University：Natural Sciences

基　　金：江苏高校"沿海开发与保护协同创新中心"计划(苏政办发[2013]56号);南通市科技引导专项(2013400303)

摘　　要：利用有限元软件ABAQUS数值模拟,从节省材料用量的角度出发,通过增大桩径的同时减小桩身壁厚来保持桩身材料横截面积不变,来考察不同桩径下,桩身的应力应变的变化规律及荷载传递机理.得到分别在水平和竖向荷载作用下,桩径较大的桩虽然桩壁变薄,仍拥有较好的结构安全储备.再考察大直径单桩侧摩阻力随深度的变化规律,发现桩侧摩阻力随着桩径的增大而增大,表明当桩径足够大时,不能忽略桩径变化对桩侧摩阻力的影响.最后通过分析轴力与桩侧摩阻力之间的关系,得出短桩与中长桩具有不同的荷载传递机理.This paper uses the numerical simulation techniques of ABAQUS to explore the stress mechanism of the large diameter pile for offshore wind turbine.From the perspective of saving material consumption,through the method of increasing diameter while reducing tube thickness to keep the cross-sectional area unchanged to explore the change law of pile＇s stress and strain and the load transfer mechanism.It is obtained that under the horizontal load and vertical load,the larger diameter pile also have better safety stock although its tube thickness has thinned.Further investigating the change law between side friction and the depth of the pile,it is discovered that the pile side friction increases along with the diameter growth.The results show that when the diameter of pile is large enough,the effect of the pile side friction can not be ignored.Finally,by analyzing the relation between axial force and pile side friction,it is found that the load transfer mechanism is different between short and long piles.

关 键 词：大直径单桩 材料用量 强度刚度 受力机理 

分 类 号：TU473[建筑科学—结构工程]