鼓型输电塔的模态分析及地震荷载下的响应
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摘要
为研究输电塔的动力特性,以新密市煤炭局某一输电线工程为背景,利用ANSYS有限元分析软件建立鼓型输电塔的三维模型,研究角钢朝向对结构自振频率的影响,并进行了输电塔的模态分析及在地震作用下的瞬态分析。结果表明:角钢不同朝向对塔的自振频率有一定影响;由于振型的多样性,鼓型输电塔的动力特性较为复杂;在地震激励下,结构横担下局部区域位移和加速度均较大,局部刚度较小。这为进一步对鼓型输电塔的结构优化、修改和加固提供了可靠的理论依据。
To study the dynamic characteristics of the transmission tower,a 3-D model of drum type transmission tower has been established by the general finite element software ANSYS,which is based on a transmission line engineering of the Coal Authority in Xinmi.The influence of the structure angle on the natural frequencies has been studied,and the modal analysis of the transmission tower as well as the transient analysis under the earthquake action has also been conducted.The analysis indicates that the different angle orientation has a certain effect on the frequencies of the tower,and the diversity of the vibration modes reveals the complex dynamic characteristics of the drum type transmission tower.With the seismic excitation,both the regional displacements and accelerations under the tower cross arm are lager while the regional stiffness is smaller.The study results offer a reliable theoretical basis for the further optimal design,modification and reinforcement of the drum type transmission tower.
To study the dynamic characteristics of the transmission tower,a 3-D model of drum type transmission tower has been established by the general finite element software ANSYS,which is based on a transmission line engineering of the Coal Authority in Xinmi.The influence of the structure angle on the natural frequencies has been studied,and the modal analysis of the transmission tower as well as the transient analysis under the earthquake action has also been conducted.The analysis indicates that the different angle orientation has a certain effect on the frequencies of the tower,and the diversity of the vibration modes reveals the complex dynamic characteristics of the drum type transmission tower.With the seismic excitation,both the regional displacements and accelerations under the tower cross arm are lager while the regional stiffness is smaller.The study results offer a reliable theoretical basis for the further optimal design,modification and reinforcement of the drum type transmission tower.
引文
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[12]曹枚根,周福霖,徐忠根,等.钢管组合大跨越输电塔结构动力特性研究[J].广州大学报,2005,4(6):543.
[2]任超,高强,冯志华,等.大跨越输电塔的模态分析[J].苏州大学学报,2009,29(1):66.
[3]曲靖,郭建波.九五期间我国电网稳定事故统计分析[J].电网技术,2004,28(21):42-45.
[4]罗靓,刘本玉,牛钲昊,等.鼓型高压输电塔的动力特性研究[J].工业建筑,2010,40(2):172-174.
[5]张晓志,孙旭壮.模态分析中输电铁塔模型的进一步简化[J].山东科技大学学报,2011,30(1):23-24.
[6]肖俊杰.输电塔塔架极限荷载及动力学分析[D].武汉:华中科技大学,2011.
[7]赵滇生,金三爱.有限元模型对输电塔架结构动力特性分析的影响[J].特种结构,2004,21(3):8-11.
[8]杜雪松,林腾蛟,李润芳.塔架结构静动态特性有限元分析[J].现代制造工程,2005(7):45-47.
[9]张庆华,顾明,黄鹏,等.格构式输电塔结构多质点简化模型研究[J].振动与冲击,2012,30(5):149-8-152.
[10]李喜来,王开明,尹鹏,等.大跨越输电塔动力特性[J].电力建设,2010,31(5):44.
[11]付鹏程,邓洪洲,吴静.输电塔结构的动力特性的模态分析[J].特种结构,2005,22(1):47-49.
[12]曹枚根,周福霖,徐忠根,等.钢管组合大跨越输电塔结构动力特性研究[J].广州大学报,2005,4(6):543.
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