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为研究采动区地表变形对输电铁塔的抗风性能的影响,本文以典型的110kV输电铁塔为例,建立了该铁塔的有限元模型。考虑不同类型地表变形的作用,分析了铁塔在风荷载作用下的破坏特征,获得了铁塔极限风荷载与地表变形的相关关系。研究表明:输电铁塔的抗风极限承载力随着地表水平变形值的增大而减小,且地表变形值越大,抗风极限承载力的减小幅度变化越明显;与垂直于风荷载方向的地表水平变形相比,当地表水平变形的方向与风荷载方向相同时,输电铁塔抗风性能的下降更为明显;地表水平拉伸变形对输电铁塔抗风性能的不利影响比地表水平压缩变形更为明显。单支座的竖向下沉对铁塔抗风性能的不利影响非常显著。
In order to study the influence of surface deformation on the wind resistance of transmission tower in mining area, a typical 110kV transmission tower is taken as an example to establish the finite element model of the tower. Considering the role of different types of surface deformation, the failure characteristics of the tower under wind load are analyzed, and the correlation between the ultimate wind load of the tower and surface deformation is obtained. The results show that the ultimate wind resistance of transmission tower decreases with the increase of surface horizontal deformation, and the greater the value of surface deformation is, the more obvious the change of the decrease of ultimate bearing capacity is. Compared with the horizontal deformation of the surface of the tower, when the direction of the horizontal deformation of the local surface is the same as that of the wind load, the decline of the wind resistance performance of the tower is more obvious. The adverse effect of the surface horizontal tensile deformation on the wind resistance of the transmission tower is lower than that of the surface horizontal compression deformation More obvious. The vertical subsidence of a single bearing has a significant impact on the anti-wind performance of the tower.