Failure Simulation Of Iced Power Transmission Tower

As an important way of electrical energy transmission, the transmission towers are not only the guarantee of providing electric power, but also an essential prerequisite for sustainable development of the national economy. A lot of large span transmission towers appear recently with the climax of transmission towers. The height of transmission towers become higher and higher, and the span of two towers become larger and larger with the climax of transmission’s structure. The damage of towers covering by ice is one of electric transmission accidents. In addition, China is one of those regions who have their large area under ice loaded condition so that they have to face the power transmission under such circumstances. Therefore, the power transmission towers’failure simulation of iced is important both for theoretical significance and engineering value. Considering that the analysis of transmission tower’s iced load power and reform plans are taken ANSYS software as the tool,the buckling analysis are about the different models’iced load power of the tower such as the straight line tower and the intersection angle tower. When the transmission towers are covered by ice, the different climate conditions will damage the towers. Therefore, the buckling analysis must consider the horizontal and vertical span, the asymmetry ice co very, the wind load power as well as iced co very. In addition, the transmission towers’static analysis basing on buckling analysis and the instability analysis to improve the lowers are being done. The specific tasks done in this dissertation are as follow;(1) In this paper, the analysis using column stability and bucking analysis,basing on ANSYS, buckling analyze the Z3straight line tower and GJIA intersection angle tower under the effects of the homogeneous、uneven、 offset load、and wind load and work out the biggest ice loaded thickness. When Z3straight line tower and GJIA intersection angle tower have been iced, the maximum thickness ice have been reached respectively to46.03mm、35mm, and were not meet the transmission towers structure maximum ice thickness50mm in next50years’technical requirements. The buckling analysis under the interactive effect of wind and ice loaded conditions, is aimed at the wind velocity of transmission towers at a certain ice thickness. When the ice thickness of transmission towers reached separately5、10、15、25、30、35mm, the respective wind velocity are is29.07m/s、20.83m/s、12.83m/s、8.811m/s7、48m/s.(2) The analysis of transmission tower’strength structure and geometric nonlinear is to work out the member static force and deformation of tower under the typical loading. Processing the static analysis with Z3straight line towers and GJIA intersection angle tower, work out the biggest compressive stress point and analyze the stability compressive bar. Combine the results of compressive bar’s stability and buckling analysis to develop the structures of transmission towers. The improved methods are applying the high strength angel steel, increase the size of angel steel and change the layout of steel frame. After improved the transmission towers, the Z3straight line towers and GJIA intersection angle towers’even ice load thickness was increased6%、57%. With the uneven coefficient figures are0.2、0.4、0.8、1、1.5, The Z3tower’s increased separately by5.53、9.99、15.16、14.02、12.05mm. Z3tower under the condition of wind load and ice covering together, the thickness of the load ice cover is almost no significant increase.