Nonlinear Buckling Analysis of Collapsed Steel Tower for 220KV Guajing Iced Transmission Line
Li Xue 1 Li Hong-nan 1 Huang Lian-zhuang 2
1. State Key Laboratory of Costal and Offshore Engineering, Dalian University of Technology, Dalian 116023 China;2. Liao Ning Electric Power Survey & Design Institute, Shenyang 110005 China
Abstract：In this paper, based on the principle of collapsed steel tower design for Guajing transmission line, the finite element model of multi-tower-line coupled system has been established according to the original data of engineering. The curve of ice increasing with time has been given according to the data of icing record. Considering the high deference, ice increasing, asymmetry between ices of conductors and wind load, nonlinear buckling analysis of transmission tower-line system under ice load and wind load has been carried out. The ultimate load of tower structure has been studied by using nonlinear buckling analysis and the cause of the tower falling down is analyzed in this paper. It can be concluded that wind load and unbalanced tension caused by overload and asymmetry between ices of conductors are the main reasons why the steel towers fell down, and technical code of design overhead transmission line in heavy icing area needs to be modified.
2009, Vol. 28 
