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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

36卷

期数:

2019年02期

页码:

92-100

栏目:

出版日期:

2019-03-26

文章信息/Info

Title:

Fatigue Reliability Analysis on High-strength Bolt Used in Wind Turbine Tower Under Combined Effect of Wind and Ice

文章编号:

1673-2049(2019)02-0092-09

作者:

谭冬梅,金 超,瞿伟廉,赵紫毅

(武汉理工大学 土木工程与建筑学院,湖北 武汉 430070)

Author(s):

TAN Dong-mei, JIN Chao, QU Wei-lian, ZHAO Zi-yi

(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei,China)

关键词:

海上风电塔;  风-冰联合作用;  高强螺栓;  疲劳可靠度

Keywords:

offshore wind turbine tower;  combined effect of wind and ice;  high-strength bolt;  fatigue reliability

分类号:

TU311.2

DOI:

-

文献标志码:

A

摘要:

针对风力机塔筒法兰联结螺栓结构特殊、受力复杂、易于失效等特点,对风-冰联合作用下高强螺栓节点的疲劳可靠度进行了研究。首先通过谐波叠加法生成风速时程,按照概化冰力函数求出作用于风电塔上的冰力时程; 然后应用ANSYS建立风电塔模型,施加生成的风荷载及动冰荷载,得到法兰中心处的应力时程曲线; 基于Schmidt-Neuper理论及有限元方法分别对法兰联结螺栓结构进行计算,得到法兰受载与螺栓应力之间的关系; 通过MATLAB多项式拟合得到外荷载作用下螺栓的应力时程曲线; 最后基于累积损伤理论,计算螺栓在不同荷载工况下的疲劳可靠度,并讨论预紧力、螺栓位置、冰速对其疲劳可靠度的影响。结果表明:考虑冰载后螺栓的疲劳可靠度均有所下降,冰载对螺栓疲劳可靠度的影响不容忽视; 预紧力的大小对风载作用下的螺栓疲劳可靠度影响较大,对冰载作用下的螺栓疲劳可靠度影响不大; 螺栓所在位置对各荷载工况下的螺栓疲劳可靠度均存在较大影响,且对冰载作用下的螺栓疲劳可靠度影响最为明显; 法兰所受外荷载大于使螺栓节点分开所需的荷载时,会增加螺栓的应力幅值,从而降低其疲劳可靠度; 冰载作用下影响螺栓疲劳可靠度的主要因素为冰激作用导致的塔架共振。

Abstract:

In view of the special structure, complex stress and easy failure of flange-bolt of wind turbine tower, the fatigue reliability of high strength bolted joints under combined effect of wind and ice was studied. Firstly, the wind speed time history was generated by harmonic superposition method, and ice force time history acting on wind power tower was calculated according to generalized ice force function. Then, ANSYS was used to build the wind tower model, and the generated wind load and dynamic ice load were applied to obtain the stress time history curve at the center of flange. Based on Schmidt-Neuper theory and finite element method, the flange bolt structure was calculated, and the relationship between flange load and bolt stress was obtained. The stress time history curve of bolt under external load was obtained by MATLAB polynomial fitting. Finally, based on the cumulative damage theory, the fatigue reliability of bolts under different load conditions was calculated, and the effects of preload, bolt position and ice speed on the fatigue reliability were discussed. The results show that after considering the ice load, the fatigue reliability of the bolt decreases, and the effect of ice load on the fatigue reliability of bolt can not be ignored. The preload has great influence on bolt fatigue reliability under wind load, but has little influence on bolt fatigue reliability under ice load. The location of bolts has great influence on the fatigue reliability of bolts under various load conditions, and has the most obvious influence on the fatigue reliability of bolts under ice load. When the external load on the flange is greater than the load needed to separate the bolted joints, the stress amplitude of the bolts will be increased, thus the fatigue reliability of the bolts will be reduced. The main factor affecting the fatigue reliability of bolts under ice load is tower resonance caused by ice-induced action.

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相似文献/References:

[1]宋 波,李吉人,王海龙,等.考虑潮位及动水压力影响的在役海上风电塔地震响应分析[J].建筑科学与工程学报,2015,32(02):35.
　SONG Bo,LI Ji-ren,WANG Hai-long,et al.Earthquake Response Analysis of In-service Offshore Wind Towers Considering Effects of Tide Level and Hydrodynamic Pressure[J].Journal of Architecture and Civil Engineering,2015,32(02):35.

备注/Memo

备注/Memo:

收稿日期:2018-09-01
基金项目:国家自然科学基金项目(51408452); 道路桥梁与结构工程湖北省重点实验室开放
基金项目(DQJJ201509)
作者简介:谭冬梅(1976-),女,四川秀山人,副教授,工学博士,E-mail:smiledongmei@163.com。

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更新日期/Last Update: 2019-03-27