| 王天政, 范顺涛, 付登锋, 闫玥.海上风机筒形基础筒体屈曲特性研究[J].海洋工程,2025,(4):133~145 |
| 海上风机筒形基础筒体屈曲特性研究 |
| Research on the buckling behavior of offshore wind turbine bucket foundations |
| 投稿时间：2024-06-08 |
| DOI：10.16483/j.issn.1005-9865.2025.04.012 |
| 中文关键词: 筒形基础 屈曲失稳 非线性数值模拟 临界初始几何缺陷 屈曲荷载 |
| 英文关键词:bucket foundation buckling instability nonlinear numerical simulation critical initial geometric imperfection buckling load |
| 基金项目:国家自然科学基金资助项目（42177122，52271290）；山东省泰山学者青年专家项目（tsqn202211071） |
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| 摘要点击次数: 18 |
| 全文下载次数: 8 |
| 中文摘要: |
| 为研究筒形基础屈曲失稳时，结构产生弹性变形及塑性变形随相关尺寸参数的变化机理，基于一致缺陷模态法选择了4种不同长径比的筒形基础进行大量非线性屈曲数值模拟，并结合结构屈曲失稳时产生弹性变形及塑性变形的界限临界初始几何缺陷进行分析。模拟得到各筒形基础在不同径厚比D/t、沉放比h/L下，结构屈曲荷载随相对初始几何缺陷的变化关系。结果表明，筒形基础结构的径厚比D/t减小、沉放比h/L增大，均会导致结构临界初始几何缺陷的减小，使结构屈曲失稳时更容易产生塑性变形。基于筒形基础屈曲失稳时变形主要集中在结构自由长度上这一变形特点，将现行《DNV-RP-C202》规范针对筒形基础屈曲失稳的计算方法进行优化，结合筒形基础非线性屈曲荷载进行无量纲化对比，完善筒形基础屈曲荷载设计方法。 |
| 英文摘要: |
| In order to study the mechanism of elastic and plastic deformation of the structure in relation to dimensional parameters during the buckling instability of bucket foundations, a large number of nonlinear buckling numerical simulations were carried out using the eigenmode-affine imperfection method for four types of bucket foundations with different aspect ratios. The boundaries between elastic deformation and plastic deformation were analyzed in conjunction with the critical initial geometric imperfection. The simulations yielded the relationships between the structural buckling load and relative initial geometric imperfections for each bucket foundation under different diameter-to-thickness ratios D/t and settlement ratios h/L. The results show that a decrease in D/t and an increase in h/L both lead to a reduction in the critical initial geometric imperfection, making the structure more prone to plastic deformation during buckling. Based on the observation that deformation during buckling is mainly concentrated within the free length of the structure, the current DNV-RP-C202 specification was optimized for calculating the buckling load of bucket foundations. Combined with the nonlinear buckling load, a dimensionless comparison was conducted to improve the design method for the buckling load. |
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