110kV大型高压输电塔架的静动力特性研究

发布时间：2018-03-08 20:04

本文选题：输电塔架　切入点：静力特性　出处：《东北石油大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电网的不断升级，输电线路作为电网的大动脉，其安全稳定的运行关乎着国民经济的稳定。而输电塔架作为支持输电线路的空间结构，它的安全可靠的运行是电网稳定运行的重要保证。由于自然环境的日益恶化，极端天气的不断出现，输电塔架在极端恶劣的环境下能否保持正常的工作状态受到大家的广泛关注。因此，研究输电塔架在各种复杂极端情况下的静动力特性对提高输电线路的安全可靠性有着重要的研究以及工程价值。本文以有限软软件ANSYS15.0为研究平台，根据已有的研究以及设计资料，研究了输电塔架的有限元模型的建立方法，建立了ZB1酒杯型直线塔的有限元分析模型，并提出了塔架在风载荷、覆冰载荷、基础沉降等工况下的研究处理办法。以ZB1直线塔为例根据设计规程，通过分析计算得出了输电塔架在大风作用下的风载荷，并分段施加在输电塔架以实现风载荷的准确施加。此外，本文通过模拟分析得到了输电塔架在风载荷作用下杆件的位移以及轴力分布情况，提出了输电塔架在风载荷的作用下可忽略输电线重量对输电塔架分析结果的影响。然后研究了输电塔架在覆冰、基础沉降等工况下的静力学特性。在覆冰均匀的情况下，在输电线上施加瞬时节点力来模拟覆冰过程，研究了输电塔架在不同冰厚时的静力响应。接下来研究了输电塔架在基础不均匀沉降的工况下的内力变化，模拟分析了输电塔架模型在沉降量为60mm时的杆件受力情况，得到了杆件应力与沉降量的变化曲线图，提出了在塔身底部放置加强板来预防和解决沉降量过大对输电塔架强度的影响。最后着重研究了ZB1输电塔架的动力特性，对有限元模型进行了模态分析，得到了输电塔架的前10阶振型以及相对应的自振频率，，通过研究发现在塔腿和塔身部分容易过早的出现局部模态，通过对比分析在输电塔架上增加横隔面的方式提高了输电塔架的强度；对输电塔架有限元模型运用Davenport风速功率谱进行了脉动风动力分析。
[Abstract]:With the continuous upgrading of the power grid, transmission lines as the main artery of the grid, its safe and stable operation is related to the stability of the national economy, and the transmission tower as a spatial structure to support the transmission lines. Its safe and reliable operation is an important guarantee for the stable operation of the power grid. Due to the worsening of the natural environment and the continuous appearance of extreme weather, Whether the transmission tower can maintain the normal working condition in the extremely bad environment has attracted wide attention. It is important to study the static and dynamic characteristics of transmission towers in various complex extreme cases to improve the safety and reliability of transmission lines. Based on the finite software ANSYS15.0, based on the existing research and design data, the finite element model of transmission tower is studied in this paper, and the finite element analysis model of ZB1 wine cup straight line tower is established. The research and treatment methods of tower under wind load, icing load and foundation settlement are put forward. Taking the ZB1 linear tower as an example, according to the design code, the wind load of transmission tower under the action of high wind is obtained through analysis and calculation, and the wind load is applied to the transmission tower by stages. In addition, In this paper, the displacement and axial force distribution of the transmission tower members under wind load are obtained by simulation analysis, and the influence of transmission line weight on the transmission tower analysis results is proposed. Then the static characteristics of transmission tower under icing and foundation settlement are studied. In the case of uniform icing, the transient node force is applied on the transmission line to simulate the icing process. The static response of transmission tower under different ice thickness is studied. Then, the change of internal force of transmission tower under the condition of uneven settlement of foundation is studied, and the stress of transmission tower model is simulated and analyzed when the settlement is 60 mm. The curves of stress and settlement of members are obtained, and the influence of excessive settlement on the strength of transmission tower is prevented and solved by placing stiffening plates at the bottom of tower. Finally, the dynamic characteristics of the ZB1 transmission tower are studied, and the modal analysis of the finite element model is carried out. The first 10 vibration modes and the corresponding natural frequencies of the transmission tower are obtained. It is found that the local modes appear prematurely in the tower legs and the tower body, and the strength of the transmission tower is improved by comparing and analyzing the way of adding the transverse plane to the transmission tower. The finite element model of transmission tower is analyzed by Davenport wind power spectrum.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM753

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