钢质天线结构风振疲劳寿命估算方法比较研究
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摘要
根据一屋顶钢质天线结构气弹模型风洞试验结果,计算了疲劳分析关键点处的应力响应功率谱;基于疲劳累积损伤理论在频域上用等效窄带法对钢天线进行寿命估算;同时,根据关键点处的应力响应功率谱,用Monte Carlo方法模拟了应力时程响应,并用雨流法对应力时程响应进行计数,用Goodm an法则考虑平均应力的影响后得到应力范围出现的概率,然后拟合了应力范围的概率密度函数,对天线进行寿命估计。结果表明,采用两种方法估算的结构风致疲劳寿命相近;平均风对结构的疲劳寿命影响很小。
The power spectra of the stress responses at critical points of a steel antenna are obtained with a wind tunnel test on its aerodynamic full model.The accumulated fatigue life is firstly calculated in frequency domain using the equivalent narrow band method.Meanwhile,the time histories of the critical stress are simulated from their power spectra using Monte Carlo method.Furthermore the stress range probability is estimated in terms of the rain flow count method considering mean stress effects with Goodman rule and then the probability density function of the stress range are fitted.And finally the fatigue life of the antenna is evaluated in time domain.The results show that the estimated fatigue life using the frequency domain method is close to that using the time domain method and the mean wind velocity has little effects on the fatigue life of the antenna.
The power spectra of the stress responses at critical points of a steel antenna are obtained with a wind tunnel test on its aerodynamic full model.The accumulated fatigue life is firstly calculated in frequency domain using the equivalent narrow band method.Meanwhile,the time histories of the critical stress are simulated from their power spectra using Monte Carlo method.Furthermore the stress range probability is estimated in terms of the rain flow count method considering mean stress effects with Goodman rule and then the probability density function of the stress range are fitted.And finally the fatigue life of the antenna is evaluated in time domain.The results show that the estimated fatigue life using the frequency domain method is close to that using the time domain method and the mean wind velocity has little effects on the fatigue life of the antenna.
引文
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[2]Petrov A.Dynamic response and life prediction of steel struc-tures under wind loading[J].Journal of Wind Engineeringand Industrial Aerodynamics,1998,74—76:1057—1065.
[3]Mikitarenko M A,Perelmuter A V.Safe fatigue life of steeltowers under the action of wind vibration[J].Journal ofWind Engineering and Industrial Aerodynamics,1998,74:1091—1100.
[4]Repetto MP,Solary G.Dynamic alongwind fatigue of slendervertical structure[J].Engineering Structure,2001,23:1622—1633.
[5]Repetto MP,Solary G.Dynamic crosswind fatigue of slendervertical structures[J].Wind and Structures,2002,5(6):527—542.
[6]Repetto M P,Solary G.Directional Wind-induced Fatigue ofSlender Vertical Structure[J].Journal of Structural Engi-neering,2004,130(7):1032—1040.
[7]Gu M,Xu Y L,Chen L Z,Xiang H F.Fatigue life estima-tion of steel girder of Yangpu cable-stayed Bridge due to buf-feting[J].Journal of Wind Engineering and Industrial Aero-dynamics,1999,80:383—400.
[8]邓洪洲,屠海明,王肇民.桅杆结构随机风振疲劳研究[J].土木工程学报,2003,36(4):19—23.
[9]王世村.高耸结构风振响应和风振疲劳分析[D]:[学位论文].杭州:浙江大学,2005.
[10]顾明,洪小健.两种天线方案抖振位移响应的比较[J].振动与冲击,2004,23(1):17—20.
[11]胡毓仁,陈伯真.船舶及海洋工程结构疲劳可靠性分析[M].北京:人民交通出版社,1996.
[12]Wirsching H,Light M C.Fatigue under Wide Band RandomStress[J].Journal of Structural Division,1980,106(7):1593—1607.
[13]星谷胜.随机振动分析[M].北京:地震出版社,1997.
[14]李桂青,曹宏.结构动力可靠性理论及其应用[M].北京:地震出版社,1993.
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