大跨越输电塔有限元刚度模拟实例研究  

Case Study on Stiffness Modeling of Long-span Power Transmission Tower Using Finite Element Method

作　　者：汪江[1] 杜晓峰[1] 张会武[1] 韩晓林[2] 何顶顶[2] 费庆国[2] 

机构地区：[1]安徽省电力科学研究院,合肥230022 [2]东南大学土木工程学院,南京210096

出　　处：《特种结构》2009年第2期28-30,91,共4页Special Structures

基　　金：国家电网公司重大科技创新项目(SGKJ[2007]1070)

摘　　要：大跨越输电塔是超高压输电网络的重要组成部分,具有塔体高、档距大及柔度大等特点,对地震、风以及导线覆冰等环境荷载反应灵敏。建立能够反映大跨越输电塔动态特性的有限元模型,对其进行结构健康监测与安全评估,并准确模拟其刚度是至关重要的。本文以500kV淮蚌线淮河大跨越输电塔为例,探讨了大跨度输电塔有限元建模中的刚度模拟。采用不同方案建立该塔的有限元模型,包括梁单元模型和梁杆混合模型,对两种模型进行了模态分析,获得了计算模态的频率及振型。而后,以实测模态数据为依据,对各方案进行了比较分析,确定梁杆混合的方案为优选方案。Long-span power transmission towers are vital important part of the state grid. The towers are always sensitive to environmental loads such as earthquake, wind and ice because of its flexibility and span. Stiffness modeling of the tower is essential for building the mechanical model of the tower with the purpose of studying the structural health monitoring and safety evaluation. This paper presents case study on stiffness modeling of long-span power trans- mission tower using finite element method, taking the 500kV Huai-Ben Line transmission tower crossing the Huaihe River as example. Multiple finite element models are established and analyzed by computing the modal frequencies and mode shapes. The models are evaluated by comparing the analytical modal frequencies with the experimental modal frequencies identified from field measurement records. It could be concluded that the model using both the beam elements and bar elements are able to model the stiffness of the tower.

关 键 词：大跨越输电塔 结构健康监测 安全评估 有限元建模 刚度模拟 

分 类 号：TU347[建筑科学—结构工程]