110kV输电线路铁塔塔基沉降应力仿真分析与试验

Stress simulation and experiment for tower foundation settlement of 110 kV transmission line

针对输电线路铁塔塔基沉降问题,利用ANSYS建立110 kV三塔两档-塔线体系有限元分析模型,研究各种沉降组合工况下铁塔关键杆件所承受的最大等效应力随沉降度的变化规律,并基于输电线路铁塔塔基沉降实验平台,采用光纤光栅解调仪测量关键杆件所受应力对仿真结果进行测试验证。结果表明:随着沉降值增大,关键杆件承受的最大等效应力近似呈线性增加;各种沉降组合工况下,发生单个或3个塔基沉降时的关键杆件所受应力最先超过应力屈服临界值;在外荷载相同时,塔基横向沉降位移限值为50 mm,纵向沉降、单个或3个沉降位移限值分别为15 mm、10 mm。

A finite element analytical model of 110kV tower-line system with three towers and two spans is established in ANSYS for analyzing the variation law of the maximum equivalent stress undertaken by the key member bars of tower for different tower foundation settlement conditions. Based on the tower foundation settlement experiment platform for transmission line,the fiber grating demodulator is applied to measure the stress for verifying the simulative results. Results show that ,the maximum equivalent stress undertaken by key member bars increases approximately linearly along with the increase of tower foundation settlement;among different tower foundation settlement conditions,the stress undertaken by key member bar exceeds the yield stress foremost in mono-foundation or tri-foundation settlement;under same external load,the displacement limit of lateral settlement is 50 mm and that of longitudinal settlement is 15ram for mono-foundation settlement or 10 mm for tri-foundation settlement.