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大跨越输电塔是超高压输电网络的重要组成部分,具有塔体高、档距大及柔度大等特点,对地震、风以及导线覆冰等环境荷载反应灵敏。建立能够反映大跨越输电塔动态特性的有限元模型,对其进行结构健康监测与安全评估,并准确模拟其刚度是至关重要的。本文以500kV淮蚌线淮河大跨越输电塔为例,探讨了大跨度输电塔有限元建模中的刚度模拟。采用不同方案建立该塔的有限元模型,包括梁单元模型和梁杆混合模型,对两种模型进行了模态分析,获得了计算模态的频率及振型。而后,以实测模态数据为依据,对各方案进行了比较分析,确定梁杆混合的方案为优选方案。
Long span transmission towers are an important part of the EHV transmission network. They have the characteristics of high tower height, large span and high flexibility, and are sensitive to environmental loads such as earthquakes, winds and wire icing. It is very important to set up a finite element model that can reflect the dynamic characteristics of long-span transmission towers. It is very important to carry out structural health monitoring and safety assessment and accurately simulate the stiffness. In this paper, a 500kV Huaihe Huaihe large-span transmission tower is taken as an example to study the stiffness simulation in the finite element modeling of long-span transmission towers. Different schemes were used to establish the finite element model of the tower, including the beam element model and the beam-rod hybrid model. The modal analysis of the two models was carried out and the modal frequencies and mode shapes were obtained. Then, based on the measured modal data, a comparative analysis of each program was made to determine the optimal solution for the beam-rod hybridization.