有限元模型对输电塔架结构动力特性分析的影响  

Effection of Finite Element Models for the Dynamical Characteristics Analysis of Transmisson Tower Structure

作　　者：赵滇生[1] 金三爱 

机构地区：[1]浙江工业大学建筑工程学院,杭州310014 [2]绍兴第一建工集团,312000

出　　处：《特种结构》2004年第3期8-11,共4页Special Structures

摘　　要：本文较全面地分析讨论了节点构造和节点刚度等因素对塔架动力性能的影响及在有限元建模中的处理方法。本文选取一个 5 0 0kV输电线路中常见的猫头型塔架 ,建立了 1个空间桁架模型、1个空间刚架模型和 3个由杆单元和梁单元组成的混合有限元模型 ,对输电塔架结构进行了模态分析 ,系统研究讨论了不同有限元模型、连接偏心对模态分析结果的影响 ,指出了各种有限元模型在塔架动力特性分析中的特点和适用范围 ,对输电塔架结构的动力特性研究具有实用意义。In this paper,the effects of different constructions and rigidities of tower joints on the dynamic properties of transmission tower are systematically analyzed,and elements type of members in FEM are discussed.In a study case of a full-scale 500kV transmission tower,a space truss model,a space frame model and three mix models constructed of bar and beam-column elements with deferent eccentric connections are modeled.The five FEM models are used for modal analyses of the transmission tower.The frist 100 order intrinsic frequencies of each model have all drawn,and the effects of the models and connection eccentricities on the results from the modal analyses are studied.The characteristics and conditions suitable to use of each model are pointed out,which may be useful in studing on the dynamic properties of transmission towers.

关 键 词：塔架结构 节点刚度 空间桁架 节点构造 有限元模型 动力特性分析 空间刚架 输电塔 500kV输电线路 梁单元 

分 类 号：TU347[建筑科学—结构工程]