1000kV大型薄壁钢管变电构架风致振动响应研究
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摘要
1000kV变电构架属于风敏感结构,风荷载是设计的主要控制荷载。该文以某一大型薄壁钢管构架为工程背景,结合多阶模态力法和模态解耦原理,提出了多模态显式积分法,并推导了结构风致响应与风振系数的计算公式。在时域内得到了结构的风致振动响应时程,研究了结构位移平均值、位移均方根值和加速度均方根值的分布特点,同时计算比较了不同风向角时构架结构典型节点的荷载风振系数和位移风振系数。通过研究,揭示了1000kV大型变电构架的风致振动特性,为构架结构的抗风设计提供了依据。
1000 kV substation frame is wind-sensitive and the wind load governs structure design. Based on the multi-modal force method and modal decoupling principle, the multi-modal explicit integration method (MMEIM) is proposed to estimate the wind-induced response of substation frame. This method is illustrated further through the analysis of a large thin-walled steel tube frame for 1000kV substation. The wind-induced dynamic responses of the structure were obtained in the time domain, including Mean nodal displacement, RMS displacement and RMS acceleration. Meanwhile, the gust loading factor and gust displacement factor at key nodes for different wind directions were also calculated and compared. This study demonstrates some characteristics of wind-induced dynamic responses of 1000 kV substation frame, and the proposed method and analysis results can provide reference for the design of large substation frame structures.
1000 kV substation frame is wind-sensitive and the wind load governs structure design. Based on the multi-modal force method and modal decoupling principle, the multi-modal explicit integration method (MMEIM) is proposed to estimate the wind-induced response of substation frame. This method is illustrated further through the analysis of a large thin-walled steel tube frame for 1000kV substation. The wind-induced dynamic responses of the structure were obtained in the time domain, including Mean nodal displacement, RMS displacement and RMS acceleration. Meanwhile, the gust loading factor and gust displacement factor at key nodes for different wind directions were also calculated and compared. This study demonstrates some characteristics of wind-induced dynamic responses of 1000 kV substation frame, and the proposed method and analysis results can provide reference for the design of large substation frame structures.
引文
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[2]Chang Shuenn-Yih.Accurate representation of external force in time history analysis[J].Journal of Engineering Mechanics,ASCE,2006,132(1):34―45.
[3]Chang Shuenn-Yih.Accuracy of time history analysis of impulses[J].Journal of Structural Engineering,ASCE,2003,129(3):357―372.
[4]Chang Shuenn-Yih.Improved explicit method for structural dynamics[J].Journal of Engineering Mechanics,ASCE,2007,133(7):748―760.
[5]Deodatis G.Simulation of ergodic multivariate stochastic processes[J].Journal of Engineering Mechanics,ASCE,1996,122(8):778―787.
[6]张相庭,结构风压和风振计算[M].上海:同济大学出版社出版,1985.Zhang Xiangting.Wind pressure on structures and vibration Computation[M].Shanghai:Publishing Company of Tongji University,1985.(in Chinese)
[7]潘峰,孙炳楠,楼文娟.大跨开孔结构屋盖风致响应分析的多模态精细时程积分法[J].浙江大学学报(工学版),2007,41(6):1000―1006.Pan Feng,Sun Binnan,Lou Wenjuan.Wind-Induced dynamic response for long-span roof of opening structure by multi-modal precise time-integration method[J].Journal of Zhejiang University(Engineering Science),2007,41(6):1000―1006.(in Chinese)
[8]张哲,李天,李光.大召营高型变电构架的动力特性分析[J].世界地震工程,2004,20(3):141―145.Zhang Zhe,Li Tian,Li Guang.The dynamic performance analyses of the high power transformation truss in Dazhaoying[J].WOrld Earthquake Engineering,2004,20(3):141―145.(in Chinese)
[9]陈传新,刘素丽.750kV变电构架结构选型[J].电力建设,2007,28(5):33―35.Chen Chuanxin,Liu Su1i.Selection of750kV substation truss structures[J].Electric Power Construction,2007,28(5):33―35.(in Chinese)
[10]王世村,孙炳楠,楼文娟,叶尹.单杆输电塔气弹模型风洞试验研究和理论分析[J].浙江大学学报(工学版),2005,39(1):87―91.Wang Shicun,Sun Bingnan,Lou Wenjuan,Ye Yin.Wind tunnel test and theoretical analysis on aeroelastic model of single-rod transmission tower[J].Journal of Zhejiang University(Engineering Science),2005,39(1):87―91.(in Chinese)
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