Reliability assessment of transmission tower in mining subsidence area

Against the background of transmission line erected on a certain mining subsidence area, the coal-mining situation at this area where transmission line passes through is analyzed, and the deformation of ground surface in the subsidence area is estimated and analyzed. Using numerical analysis, the impacting rule of ground surface deformation on structural internal force and deformation of transmission towers is re-searched. Research results show that except the downward displacement load exerted on single support abutment, it is reputed that the abutment displacement is within 5‰ of the foot distance of a tower under other working conditions when the yield load of bars will not be achieved; it is possible to taken the abutment displacement that appear when the material Q235 begin to yield as the criterion to judge whether the tower is safe, i.e., when the estimated ground surface deformation is smaller than the abutment displacement under the yield limit of the material Q235, the transmission tower can be considered as in safe condition.