单桩式海上风机基频计算方法及参数分析  

Fundamental frequency calculation method and parameter analysis of monopile offshore wind turbines

作　　者：余云燕[1] 候浩胜 孔嘉乐 YU Yunyan;HOU Haosheng;KONG Jiale(College of Civil English,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《地震工程学报》2025年第2期281-288,共8页China Earthquake Engineering Journal

基　　金：甘肃省科技计划项目资助(23JRRA854)。

摘　　要：海上风机结构体系属于动力敏感型结构,参数变化易对系统基频产生影响。系统基频是海上风机结构与基础设计的关键,精确计算系统基频具有非常重要的工程意义。文章基于Euler-Bernoulli梁理论,考虑桩-土相互作用、水体附加质量和塔筒变截面特性,采用回传射线矩阵法建立单桩式海上风机系统横向基频计算方法。利用实际工程验证该方法的精确性和有效性,并对系统基频偏移因素进行综合分析。分析表明,桩-土相互作用、水体附加质量和塔筒变截面特性对系统基频影响显著;系统基频对参数的敏感性为:桩基埋深>桩径>地基土模量>上部质量>海水深度>桩基壁厚;桩基埋深、桩径、地基土模量和桩基壁厚存在临界值,超过该值后参数变化对系统基频基本无影响。文章在一定程度上揭示了系统基频偏移因素影响规律,可为风机的结构和基础设计提供参考。As a dynamic-sensitive structure,the changes in the offshore wind turbine structure are easy to affect the fundamental frequency of the system.The fundamental frequency of the system is key to the structure and foundation design of offshore wind turbines;hence,it is of great engineering significance to accurately calculate the fundamental frequency of the system.Based on the Euler-Bernoulli beam theory,considering the pile-soil interaction,added water mass,and the variable section characteristics of the tower,a calculation method of the transverse fundamental frequency of the single-pile offshore wind turbine system was established using the reverberation-ray matrix method.The accuracy and effectiveness of the proposed method were verified by a practical project,and the fundamental frequency excursion factors of the system were comprehensively analyzed.The analysis results showed that the pile-soil interaction,the added water mass,and the variable section characteristics of the tower all have a significant effect on the fundamental frequency of the system.The sensitivity of the system's fundamental frequency to different parameters is as follows:buried depth of pile foundation>pile diameter>modulus of foundation soil>upper mass>seawater depth>wall thickness of pile foundation.When the buried depth of the pile foundation,the pile diameter,the foundation soil modulus,and the wall thickness of the pile foundation exceed the critical value,the change of parameters has little effect on the fundamental frequency of the system.To a certain extent,this paper revealed the influence law of fundamental frequency excursion factors of the system,thus providing a reference for the structure design of offshore wind turbines.

关 键 词：海上风机 单桩基础 自振频率 水-桩-土相互作用 参数分析 

分 类 号：TU473[建筑科学—结构工程]