单桩基础弱化对海上风机动力响应的影响  

Influence of monopile foundation weakening on dynamic response of offshore wind turbine

作　　者：席义博 龚优华 潘嘉宁 王振宇[1] XI Yibo;GONG Youhua;PAN Jianing;WANG Zhenyu(College of Civil and Architecture,Zhejiang University,Hangzhou 310058,China;CGN New Energy Holdings Co.Ltd.,Taiyuan 030000,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]中国广核新能源控股有限公司,山西太原030000

出　　处：《中南大学学报（自然科学版）》2023年第1期229-237,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51779224,51579221);浙江省基础公益研究计划(LHZ19E090002)。

摘　　要：为研究海上风机在基础弱化条件下的动力响应特性以及基础刚度对其动力响应的影响,以某单桩基础的海上风机为例,建立考虑基础刚度弱化的海上风机动力分析模型,进行不同基础刚度条件下风机的整体动力响应分析。研究结果表明:基础刚度降低,对上部结构的约束作用减弱,结构的自振频率随基础刚度降低而减小,逐渐接近风机1P频率,增大结构共振风险;泥面和塔底处的水平位移受基础刚度影响较大,而塔顶水平位移对基础刚度变化不敏感;基础刚度降低会轻微增大极限弯矩荷载,但会较明显地增大塔底疲劳荷载,导致对结构疲劳的不利影响;风机紧急停机会产生更剧烈的结构响应,并且基础刚度降低会加剧这一现象。In order to study the dynamic response characteristics of offshore wind turbine under foundation weakening conditions and the influence of foundation stiffness on its dynamic response, a monopile supported offshore wind turbine was taken as an example, a dynamic analysis model of offshore wind turbine was built in consideration of underlying stiffness weakened, and dynamic response of wind turbines under different foundation stiffness conditions were analyzed. The results show that due to the decrease in the foundation stiffness, the constraint of the upper structure is reduced, and the natural frequency of the structure decreases with the decrease of the foundation stiffness, gradually approaching the wind turbine 1P frequency, and the resonance risk of the structure wound be increased. The horizontal displacement of mudline and bottom of tower are greatly affected by the foundation stiffness, while the horizontal displacement of tower top is not sensitive to the change of foundation stiffness. The decrease in the foundation stiffness will slightly increase the extreme bending moment, but it will increase the fatigue load of bottom of tower, resulting in the adverse effects on structural fatigue. The wind turbine emergency shutdown produces a more intense structural response, and the decrease of foundation stiffness will aggravate this phenomenon.

关 键 词：海上风机 单桩基础 基础刚度 动力响应 基础变形 疲劳荷载 

分 类 号：TU3[建筑科学—结构工程]