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工程科学与技术:2021,53(2):38-44
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风电塔在地震和风荷载下的失效概率评估
(1.四川大学 建筑与环境学院,四川 成都 610065;2.四川大学 深地科学与工程教育部重点实验室,四川 成都 610065;3.四川大学 破坏力学与工程防灾减灾四川省重点实验室,四川 成都 610065;4.同济大学 土木工程学院,上海 200092)
Failure Probability Evaluations of a Wind Turbine Under Earthquakes and Wind Loads
(1.College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China;2.Key Lab. Deep Underground Sci. and Eng., Ministry of Education, Sichuan Univ., Chengdu 610065, China;3.Failure Mechanics & Eng. Disaster Prevention and Mitigation, Key Lab. of Sichuan Province, Sichuan Univ., Chengdu 610065, China;4.College of Civil Eng., Tongji Univ., Shanghai 200092, China)
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投稿时间:2020-04-21    修订日期:2020-06-22
中文摘要: 对某在役风电塔进行了地震和风荷载下的失效概率对比。首先,结合风电塔特有的设计使用年限对于特定地区下的地震和风的发生概率进行概率分析,得到灾害危险性曲线。接着,以壳体单元和梁单元建立了包含叶片和塔体的有限元模型,以地震反应谱和风谱为基准选择和生成多组时程记录,使用增量时程动力时程分析的方法,分别在地震和风荷载下,进行非线性有限元计算,得到该风电塔在两个灾种下的易损性曲线。最后,根据危险性和易损性分析结果,使用全概率公式,比较在地震和风两种不同灾种下的总体失效概率。结果表明,采用特定设计使用年限对风电塔危险性进行评估可以避免计算过于保守的问题。由于可变桨距,在风荷载和运转工况范围内,风电塔响应大致保持不变。另外,风荷载下风电塔的失效概率大于地震,一方面,因为风电塔的固有周期相对较长,位于地震反应谱的下降段,实际的地震响应比较低;另一方面,风电塔建设在风能的充沛区域,强风荷载的发生概率较大。本文考虑风电塔特有设计使用年限的概率分析对风电领域在多灾种下的概率评估提供了有益指导。
Abstract:Comparative evaluations of failure probability were conducted with respect to an in-service wind turbine under earthquakes and wind loads. Firstly, to obtain the hazard curves under earthquakes and wind loads for a specific region where the wind turbine was built, hazard probability analyses were performed based on the special lifetime of this wind turbine. Then, to obtain structural fragility curves under earthquakes and wind loads, a blade-tower finite element model was established by shell and beam elements in a commercial finite element software and multiple sets of time histories were selected or generated based on the target seismic response and wind spectra. Numerous incremental dynamic analyses under material and geometric nonlinearity were conducted, respectively. Finally, according to the results of hazard and fragility analyses and the law of total probability, failure probabilities of the wind turbine under the two different disasters were compared. Results showed that the issue of conservative calculations was avoided by the hazard analysis based on the specific lifetime of wind turbines. On the account of the controllable pitch installed on the wind turbine, wind-resist responses under operational conditions were similar. Additionally, the failure probability of the wind turbine under wind loads was larger compared with the probability under earthquakes. On the one hand, the wind turbine was a long-period structure whose frequency was located at a point in the descending range of the seismic response spectrum; therefore, earthquake response was relatively low due to the short-period dynamic loads. On the other hand, the wind-rich areas were typically selected as the sites for wind farms, enlarging the probability of strong wind conditions and improving the failure probability under wind loads. The conducted investigations in this paper, considering the special lifetime of the wind turbine, guides the development of the multi-hazard probability evaluation in the wind turbine field.
文章编号:202000323     中图分类号:TU313    文献标志码:
基金项目:国家自然科学基金项目(51878426);四川省国际合作项目(18GJHZ0111)
作者简介:第一作者:戴靠山(1977-),男,教授,博士.研究方向:土木工程防灾及能源基础设施韧性.E-mail:kdai@scu.edu.cn;通信作者:赵志,E-mail:doublezzzzz@tongji.edu.cn
引用文本:
戴靠山,赵志,孟家瑶.风电塔在地震和风荷载下的失效概率评估[J].工程科学与技术,2021,53(2):38-44.
DAI Kaoshan,ZHAO Zhi,MENG Jiayao.Failure Probability Evaluations of a Wind Turbine Under Earthquakes and Wind Loads[J].Advanced Engineering Sciences,2021,53(2):38-44.