| 影响不对称支撑圆形钢天线风致疲劳寿命的因素 |
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| 引用本文： | 王钦华,顾明.影响不对称支撑圆形钢天线风致疲劳寿命的因素[J].土木建筑与环境工程,2010,32(4):19-25. |
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| 作者姓名： | 王钦华 顾明 |
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| 作者单位： | 同济大学,土木工程防灾国家重点实验室,上海,200092;汕头大学,土木工程系,广东汕头,515063;同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金创新研究群体科学基金(50621062);国家自然科学基金重大研究计划重点项目(90715040);国家自然科学基金重点项目(50638010) |
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| 摘 要： | 在求得结构不同风向、风速下风致响应以及结构所在位置处的风速风向联合分布函数的基础上,基于经典的疲劳累积损伤理论,对一实际不对称支撑圆形截面钢结构进行风致疲劳寿命估计。通过实例分析的结果,讨论了风向、结构表面粗糙度、涡激共振以及平均风速等重要因素对结构风致疲劳寿命的影响。计算结果表明:1)风向对结构的风致疲劳累积损伤影响较大,在出现概率大的风向区间内造成的疲劳累积损伤较大;2)结构表面粗糙度对结构的风致疲劳寿命影响也较大,疲劳寿命随着表面粗糙度的增加而减小;3)涡激共振对结构的疲劳寿命有一定的影响,在计算结构的风致疲劳寿命时,不应该忽略涡激共振的影响;4)平均风荷载对结构的风致疲劳寿命影响较小。
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| 关 键 词： | 不对称支撑结构 风致疲劳寿命 风速风向联合分布 结构表面粗糙度 涡激共振 |
| 收稿时间： | 2009/12/27 0:00:00 |
Influence Factors on Wind induced Fatigue Life of Steel Circular Antenna with Asymmetric Brace |
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| WANG Qin hua and GU Ming.Influence Factors on Wind induced Fatigue Life of Steel Circular Antenna with Asymmetric Brace[J].土木建筑与环境工程,2010,32(4):19-25. |
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| Authors: | WANG Qin hua and GU Ming |
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| Affiliation: | State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,P. R. China;Department of Civil Engineering,Shantou university,Shantou 515063,P. R. China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,P. R. China |
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| Abstract: | Wind induced responses of a single steel circular antenna with an asymmetric brace were computed considering wind speed and direction joint distribution function at location of the structure, and then wind induced fatigue life of the structure was estimated in frequency domain and time domain, respectively. Some parameters, including wind direction, surface roughness, vortex induced resonance and mean wind speed, which would have effects on the wind induced fatigue life of the structure,were discussed. It is found that 1) wind direction has great effects on wind induced fatigue damage, that is, significant fatigue can occur in wind direction of high probability; 2) the more roughness the surface of structure is, the shorter the wind induced fatigue life is; 3) the effects of vortex resonance on wind induced fatigue life should not be neglected; 4) the mean velocity has slight impact on the wind induced fatigue life of the structure. |
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| Keywords: | structure with asymmetric wind induced fatigue life wind speed and direction joint distribution function surface roughness vortex induced resonance |
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