水力发电2024，Vol.50Issue(6)：97-103,7.
基础环式基础连接旋转刚度的退化规律研究
Research on Degradation Pattern of Foundation Connection Rotational Stiffness in Ring Foundation Systems
摘要
Abstract
The damage to the ring foundation in a gravity-based foundation will reduce the anchoring stability between the foundation ring and the concrete base.Consequently,the wind turbine experiences significant tilting of the foundation ring during operation,which will adversely affect the operation safety of the wind turbine.Through monitoring tests on two wind turbines,considerable differences are observed in the foundation connection rotational stiffness between the two turbines.In order to understand the influence of different degrees of foundation damage on the foundation connection rotational stiffness,the finite element models of a 2.0 MW wind turbine foundation are established using ABAQUS for both intact and thirteen different damaged foundation scenarios.The results indicate that the rotational stiffness of foundation connection decreases with the enlargement of concrete void under the lower flange.Specifically,the rotational stiffness for the foundation with cracks penetrating through the foundation ring and concrete is 76.4%of the initial stiffness,while the foundation with a 15° void under the lower flange exhibits a rotational stiffness of 52.1%of the initial stiffness.The angles of the cavity within the range of 0°-15° and 30°-75° have a significant impact on the degree of degradation of the foundation connection rotational stiffness.Based on the observed degradation pattern of foundation connection rotational stiffness due to foundation damage,a method for evaluating the stability of wind turbine foundations is proposed.This method suggests using the foundation connection rotational stiffness in the ring foundation as a stability evaluation indicator for the ring foundation wind turbines.The method considers the foundation connection rotational stiffness after the wind turbine assembly as the initial value,providing a basis for comparing the subsequent foundation connection rotational stiffness of ring foundation wind turbines.关键词
风力机基础/基础损伤/基础连接旋转刚度/主风方向/有限元模型Key words
wind turbine foundation/foundation damage/foundation connection rotational stiffness/main wind direction/finite element model分类
能源科技引用本文复制引用
李建平,刘哲锋..基础环式基础连接旋转刚度的退化规律研究[J].水力发电,2024,50(6):97-103,7.基金项目
国家自然科学基金资助项目(51678072) （51678072）
长沙理工大学土木工程重点学科资助项目(18ZDXK01) （18ZDXK01）
