输电塔线体系的动力响应分析

Dynamic Response Analysis of Transmission Tower-Line System

以有限单元法为理论依据,建立了较精确的塔线体系模型,先对其进行模态分析,可以得出塔线体系主要振型与单塔振型接近,只是耦合了导、地线的模态;然后对单塔和塔线体系两种模型分别进行地震响应分析,通过对比可以得出:导、地线的存在使输电塔的位移和加速度响应有所减小,在一定程度上起到了类似阻尼器的作用,但因为导、地线的质量不可忽视,塔底支座各个方向的反力并非都减小,设计时应综合考虑输电线对输电塔的影响。

In this paper, accurate model of transmission tower-line system is established according to finite element method theory. Through the modal analysis, the conclusion has been reached that the main vibration mode of transmission tower-line system is close to vibration mode of single tower except coupling the modality of transmission lines. Then it discusses on the transmission lines＇ effects on transmission tower by means of analysis of seismic response and comparison of the seismic response between the tower-line system and the single tower. Results show that the displacement response decreases due to the transmission tower and the transmission lines to some extent play the role of the damper. Meanwhile the quality of transmission is a factor to be reckoned with, and the bearing reaction of bottom isn＇t reduced, which is worth of attention in design.