A finite element analysis model of a 220kV cat-head transmission tower was established by using general FEA software ANSYS. The axial forces of tower members under three load cases were analyzed by static method and dynamic method, respectively. The typical three load cases include non-uniform settlement, inclination and horizontal slip of the tower foundation. The dynamic impact factors of the axial forces of tower members with sudden foundation deformation were calculated. It shows that the stress of the diagonal member located at the tower leg varies with the maximum amplitude in the process of foundation deformation. The diagonal member located at the tower leg will be firstly in failure state. The peak values of tower member forces occur near the initial time of the foundation, while the effect of damping ratios on the peak values is not significant. When the damping ratio is valued as 0.01 and 0.05, the variation between the peak axial forces of leg main member is only about 3.5%. For the transmission lines in the mining subsidence areas with dramatic surface deformation, the dynamic impact effect from sudden foundation deformation on transmission tower structures is significant. By considering the dynamic impact effect, the stress ratio of the diagonal member located at the tower leg under non-uniform settlement is increased by more than 50%. The increasing extents even exceed 100% for the single side inclination case and the horizontal slip case.
杨风利1. 采空区基础变形过程中输电铁塔结构动力冲击效应分析[J]. 振动与冲击, 2018, 37(1): 181-186.
Yang Fengli1. Impact effect analysis on the transmission tower structures with foundation deformation in mining subsidence areas. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(1): 181-186.
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