横隔面在高压输电塔抗风设计中的作用分析
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摘要
采用数值模拟方法来研究横隔面在高压输电塔抗风计中的作用问题。具体步骤是:采用考虑随高度变化Kaimal风速谱和Devenport相干函数,并结合谐波合成法数值模拟线路风场;在ANSYS有限元软件中建立不同横隔面配置方式的输电塔线体系的有限元模型,用ANSYS有限元软件分别对模型进行动力特性分析及风致动力响应时程分析;分析结果显示在输电塔设计中合理配置横隔面,可以消除输电塔局部阵型过早出现,有效抑制输电塔斜撑的面外变形和降低主材内力,从而进一步提高输电塔的抗风性能。
Numerical simulation is used in this paper to study effects of diaphragm on wind resistant design of power transmission towers.Firstly,using 'Kaimal' wind speed spectral changed with height and 'Devenport' correlation function,then combining with WAWS to simulate the wind field around lines.Secondly,many models about transmission line system at different cross section are established in ANSYS,and made analysis about dynamic characteristic and time history of wind-induced response.The results show that rational allocation of cross section in design can avoid early appearance of local modal shapes of transmission towers,effectively restrain the out-plane deformation of sprag,and reduce the force of main member.Then the wind resistance performance of transmission tower is further improved.
Numerical simulation is used in this paper to study effects of diaphragm on wind resistant design of power transmission towers.Firstly,using 'Kaimal' wind speed spectral changed with height and 'Devenport' correlation function,then combining with WAWS to simulate the wind field around lines.Secondly,many models about transmission line system at different cross section are established in ANSYS,and made analysis about dynamic characteristic and time history of wind-induced response.The results show that rational allocation of cross section in design can avoid early appearance of local modal shapes of transmission towers,effectively restrain the out-plane deformation of sprag,and reduce the force of main member.Then the wind resistance performance of transmission tower is further improved.
引文
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[10]Yan Bo,Liu Xiaohui,Liu Baoan.Dynamic response analysis of windage yaw of overhead transmission lines[J].WSEAS Transactions on Ap-plied Theoretical Mechanics,2006,1(1):90-97.
[11]国家电力公司东北电力设计院.电力工程高压送电线路设计手册[M].第二版.北京:中国电力出版社,2003:103-327.
[12]谢强,丁兆东,赵桂峰,李杰.不同横隔面配置方式的输电塔抗风动力响应分析[J].高电压技术,2009,35(3):683-687.
[13]刘小会.架空高压输电线路风偏数值模拟研究[D].重庆大学,2007:32-35.
[2]谢强,李杰.电力系统自然灾害的现状与对策[J].自然灾害学报,2006,15(4):126-131.
[3]谢强,李杰.横隔面在高压输电塔设计中的作用分析[J].高电压技术,2006,32(4):1-4.
[4]张希黔,葛勇,严春风,晏致涛.脉动风场模拟技术的研究与进展[J].地震工程与工程振动,2008,28(6):206-211.
[5]白海峰,李宏男.大跨越输电塔线体系随机脉动风场模拟研究[J].工程力学,2007,24(7):146-151.
[6]贺德馨.风工程与工业空气动力学[M].北京:国防工业出版社,2006:29-42.
[7]Shinozuka M,Jan C M.Digital simulation of random processes and its applications[J].Journal of Sound and Vibration,1972,25(1):111-128.
[8]杨帆,杜文风,王永峰,刘磊.输电铁塔结构脉动风模拟的谐波叠加法[J].中国科技信息,2008(5):274-275.
[9]石辛民,郝整清.基于MATLAB的实用数值计算[M].北京:清华大学出版社,2006:12-75.
[10]Yan Bo,Liu Xiaohui,Liu Baoan.Dynamic response analysis of windage yaw of overhead transmission lines[J].WSEAS Transactions on Ap-plied Theoretical Mechanics,2006,1(1):90-97.
[11]国家电力公司东北电力设计院.电力工程高压送电线路设计手册[M].第二版.北京:中国电力出版社,2003:103-327.
[12]谢强,丁兆东,赵桂峰,李杰.不同横隔面配置方式的输电塔抗风动力响应分析[J].高电压技术,2009,35(3):683-687.
[13]刘小会.架空高压输电线路风偏数值模拟研究[D].重庆大学,2007:32-35.
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