| The fundamental purpose is to understand different forms of UHV transmissiontower under the action of earthquake damage, and improve the capacity of UHVtransmission tower to resist earthquake and severe damage to environment load underdifferent site conditions. Today, in the rapid development of UHV transmission line,1000kV UHV transmission tower is becoming more and more widely applied. Usingthe angle iron transmission tower has already can’t satisfy the design requirements ofthe1000kV power transmission tower, so we introduced the steel tube materials.CoMPared with the angle iron, steel tube has the smaller area, the better performanceof Cross-sectional area, and the higher ultimate bearing capacity. At the same timecoMParing the UHV transmission tower with the common transmission tower, it hashigher tower structure, greater distance between the towers and more flexible. So thereaction of UHV transmission tower is particularly sensitive in disasters such asearthquakes, especially in the case of strong earthquakes. Under seismic load, thelocal of towers are vulnerable to damage, and severe cases may even make the wholetower collapsed. Therefore, the research of the UHV steel tube tower under theearthquake loads is very necessary, and this paper aimed at study the dynamiccharacteristics of transmission tower under the8degree seismic load.Firstly, it introduces the research status of the finite element model oftransmission tower under the seismic load, and discusses several important influencefactors of seismic wave. Secondly, it takes the1000kV double circuit steel tube toweras the prototype, discusses the dynamic behavior of the transmission tower with theconductor simplified model under the seismic load and extracts the12orderfrequency and vibration mode in the modal analysis. Thirdly, it establishes the finiteelement model and simulates the seismic detector under the different ground motion.One typical seismic waves with each type of site soil is chosen to input to the modelwith single direction，double directions and three directions to research on the steeltube tower form the influence of ground motion. Adjusting each peak of the seismicwave acceleration explores the changing rule of the dynamic characteristics oftransmission tower under the8degree seismic basic intensity and expected rareseismic intensity, and also explores the wire nonlinear vibration effects for the ultrahigh voltage UHV transmission tower with the conductor simplified model under the earthquake loads. It accesses to the change tendency of the displacement, the internalforce and stress of UHV transmission tower. Then we can grasp the dynamiccharacteristics of transmission tower under8degree of intensity and provide thereliable basis for the seismic research of UHV transmission tower. |
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