塔-线耦联对输电塔抗地表变形的影响研究

以典型的110kV双回路自立式耐张塔为例,通过ANSYS有限元软件建立单塔和塔-线耦联体系两种有限元模型,研究了两种模型在采动区地表变形下的内力响应差异。有限元分析结果表明:塔-线耦联的影响使得整塔杆件在地表变形下最大轴向力比单塔模型增加了一倍多,各杆件的轴向力都增加显著;塔-线耦联作用使得整塔杆件在地表变形下的平面内弯矩也有所增加,但与轴向力的变化相比较为平缓;单塔和塔-线耦联体系杆件的最大截面应力都发生在塔腿根部主材上,应力值差别不大,但塔-线耦联体系整个结构其它杆件的截面应力都增加明显,塔-线耦联作用对输电塔抗地表变形性能的影响不容忽视。

Study on Coupling Effect of Tower-Line System on Transmission Tower under Surface Deformation

This paper established finite element models of a single tower and a tower-line coupling system for a typical double-circuit angle tower of 110kV to study the influence regularities of ground surface deformation on transmission tower-line system in the mining area.The results of finite element analysis show that,influenced by the coupling effect of tower and lines,the maximum value of axial force of bars in tower-line system model is more than twice bigger than that in single tower model and the values of axial forces of all bars in tower-line system model increase significantly;while the maximum value of in-plane bending moment of bars in tower-line system model increases with less sharp changing than that of axial force between the two models;same as in the tower-line system model,the maximum values of cross-section stress of bars occur in the roots of tower legs in single tower model,and the difference of the value is small between the two models,however,the section stresses of all the other bars in tower-line system increase significantly,the coupling effect of tower and line on anti-deformation properties of tower under surface deformation can not be ignored.