摘要
为研究大跨度大高差输电塔线体系的抗震性能,采用ANSYS建立了输电塔线体系和单塔的有限元模型,开展了模态分析和动力时程分析。研究结果表明:塔线体系的自振频率小于单塔的自振频率;一塔两线模型和三塔两线模型中输电塔的1阶频率分别是单塔模型的0.79倍和0.71倍;各模型垂直导地线方向(X向)的位移和加速度相差不大,塔线体系顺导地线方向(Y向)位移明显大于单塔顺导地线方向位移;在峰值加速度为0.62g的Taft波作用下,X向加载时,各模型的塔腿轴力差异不大,Y向加载时,三塔两线模型的塔腿轴力约为一塔两线模型的2.00倍、单塔模型的1.72~1.90倍。在抗震设计分析中,应正确选择输电塔线体系模型。
To study the seismic performance of long-span and large height difference transmission tower-line systems,finite element models of long-span and large height difference transmission tower-line system and a single tower were established by ANSYS,and modal analysis and time history analysis were carried out.The results indicate that the natural frequencies of tower-line systems are lower than that of a single tower,the first-order frequencies of the one-tower-two-line model and the three-tower-two-line model are 0.79 times and 0.71 times that of the single tower model,respectively.The displacement and acceleration perpendicular to the line direction(X direction)of each model are not significantly different.The displacements of the tower-line systems along the line direction(Y direction)are significantly greater than that of the single tower model.Moreover,under the excitation of Taft wave with a peak ground acceleration of 0.62g,the axial forces of the tower leg elements in each model are not significantly different when loaded in the X direction,while in the Y direction,the axial force of the tower leg elements in the three-tower-two-line model is about 2.00 times that in the one-tower-two-line model and about 1.72-1.90 times that in the single tower model.In seismic design analysis,the model for the transmission tower-line system should be appropriately selected.
作者
郭锐
杨利容
刘翔云
何松洋
蒲凡
张晋芳
GUO Rui;YANG Lirong;LIU Xiangyun;HE Songyang;PU Fan;ZHANG Jinfang(School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China;Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610056,China)
出处
《四川建筑科学研究》
2026年第1期13-22,共10页
Sichuan Building Science
基金
超高压输电线路在地震作用下的灾害调研及动力响应研究(企事业单位委托项目KQ0877)。
关键词
大跨度
大高差
塔线体系
动力特性
抗震性能
long-span
large height difference
tower-line system
dynamic characteristic
seismic performance
