高寒地域静冰压力对输电塔影响的数值分析

Analysis of Shear Failure of Transmission Tower under Static Ice Pressure in High-cold Region

以大庆地区输电线路铁塔入冬后底部结冰致使输电塔遭到破坏为例,建立冰层—输电塔腿模型,并运用有限元分析软件ANSYS分析水结冰产生静冰压力对输电塔的影响。模拟结果表明,冰层因温度升高而膨胀从而产生静冰压力,冰层在冻结过程中对置于其中的输电塔产生横向剪切作用,致使塔材产生弯曲,从而改变了输电铁塔塔材原有的传力方式,塔腿部分在铁塔自重、风荷载与静冰压力组合作用下发生破坏和变形,严重时可导致输电塔倒塔,从而影响供电可靠性。

Water frozen in bottom of transmission towers in Daqing area can cause the transmission towers being damaged in winter.The model of ice-transmission tower leg was established.And then the finite element analysis software ANSYS was to analyze the impact of static ice pressure on the transmission tower.The calculation results show that the temperature of ice increases with the increase of air temperature and then the static ice pressure is produced.The effect of the static ice pressure generated by the ice on the transmission tower during the freezing process caused the tower bent.Thus,the original stress mode of transmission tower material was changed.The combined action of the dead weight of tower body,wind load and static ice pressure cause the part of tower leg shear failure and deformation.It can lead to the tower collapse to affect the reliability of power supply.