为了准确有效研究大跨越输电塔-线体系中杆塔结构在覆冰断线工况下的动力响应,以晋东南-南阳-荆门1 000 kV特高压输变电工程中的黄河大跨越段为原型,进行了模拟覆冰条件下五塔四线塔-线体系模型的断线冲击响应试验.试验测得了输电塔薄弱位置杆件的应变时程曲线,研究了塔-线体系在不同断线工况下杆塔的动力响应.通过分析得出了输电杆塔的最不利断线工况,找出了输电塔在断线冲击作用下的最不利位置,为输电塔结构抗冰灾设计提供了有价值的参考.通过进一步研究发现,当断线位置在导、地线悬挂点附近时,输电塔的测点应变突变值与覆冰厚度成近似的一元二次函数关系.%In order to study dynamic response of a tower structure to icing line disconnection on a long span transmission tower-line system accurately and effectively, taking a part crossing over Yellow River of a 1000kV ultra high voltage( UHV) transmission project as the prototype, a line disconnection test on an icing aeroelastic model was performed to find the dynamic response of a tower structure under different conditions of icing line disconnection. The time-history curves of strain at the weak locations of a transmission tower were observed in the test. Through analyging the dynamic response of the tower structure to icing line disconnection, the most unfavorable line disconnection conditions and the most unfavorable positions of the tower were obtained. The results provided a scientific basis for anti-ice disaster of tower structure. Further studies showed that the relation between dynamic response of each measured point on a tower and ice thickness is an approximate parabolic function.
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