大跨越输电塔线体系地震时程响应研究

Research on Seismic Time-history Response of Long-span Transmission Tower-line System

本文针对国外某大跨越输电塔线体系,利用ANSYS15.0软件建立了导线、单塔和塔线体系模型。然后,进行了动力特性分析,发现导地线的质量作用使塔线体系中跨越塔的自振频率降低,且在横导线方向降低幅度更大。最后,采用时程分析法对单塔及塔线体系进行双向输入地震响应分析。发现导地线对钢塔顺导线与横导线方向地震响应的影响程度不同,塔线体系的顺导线方向是结构抗震更为不利的作用方向;两种体系大部分杆件轴力峰值的差别不大,但对于部分控制杆件的轴力,塔线体系的结果比单塔体系小,说明输电线对塔线体系的抗震起到有利作用。

A long-span overseas transmission tower-line system was studied in this paper and ANSYS15.0 software was used to establish the finite element model of the transmission line single tower and tower-line system.Then the dynamic characteristics were analyzed separately.It was found that the natural frequency of the tower in the tower line system was reduced by the mass effect of the transmission line and the reduction in the direction of the transverse line was greater.Finally the time-history analysis method was used to study the seismic responses of the single tower and the tower-line system under bidirectional input conditions.The results showed that the transmission line had different effects on the seismic response of the transmission tower in the transverse direction and longitudinal direction.The longitudinal direction of the tower-line system was the more unfavorable direction of the structure under the action of earthquakes.The difference in the peak axial force of most members of the two systems was not significant but for the axial force of some control members the results of the tower line system were smaller than those of the single tower.It indicated that the transmission line played a beneficial role in the earthquake resistance of the tower-line system.