输电塔-线体系断线冲击分析

输电线路工程是重要的能源传输工程,但由于输电线路大多架设于乡间野外,长年累月受到环境荷载的作用,极有可能发生导线断裂事故.为了探究断线对输电塔-线体系的冲击作用,运用ABAQUS有限元软件建立“四塔三线”模型,模拟不同输电线断线工况下的动态过程,开展了断线后输电塔的受力分析.基于定义的冲击系数,分析了断线前后输电塔主材...

Finite element analysis of the impact on the transmission tower caused by wire breakage

The transmission tower-line systems play a vital role in power transmission. However, since most of the transmission tower-line systems are situated in rural areas subjected to various extreme weather conditions, transmission conductors are prone to be broken. In order to investigate the dynamic impact of conductor breakage on the transmission tower, a finite element model is established in ABAQUS, and the global state of the transmission tower is determined according to the base reaction. By calculating the impact coefficient of the main members in different parts of the tower under different working conditions, the changes of axial forces of the main members in different positions are shown, and the most severely impacted parts of the tower are identified. Finally, the simulation results are compared with the current norm, and the shortcomings of the criteria are pointed out. The results show that the main failure modes of transmission tower caused by wire breakage are bending failure and torsion failure, and the bending failure is more serious. When a single wire is broken, the impact caused by the rupture of the upper wire is the most serious, and the place suffering the greatest impact is the section between the crossarm connected with the broken wire and the adjacent crossarm. With the increase of the number of broken wires, the proportion of torsion failure increases, and the sections between two adjacent crossarms are damaged seriously. In addition, it is necessary to use dynamic methods to analyze structures, because using current codes and static methods to calculate the influence of wire rupture on structures cannot ensure that structures are still safe under the dynamic impact of wire rupture.