【作者】 申琳；

【导师】 陈平； 赵冬；

【作者基本信息】 西安建筑科技大学 ， 防灾减灾工程及防护工程， 2008， 硕士

【摘要】 随着电厂装机容量越来越大,电力输送逐渐形成输电线路远、电压高的特点。输电线铁塔多建在崇山峻岭及交通不便地区,抱杆作为建造铁塔的一种吊装工具,由于操作简单,稳定性能好,效率高,机具设备少,占地面积小,既经济又安全,在电力建设施工中应用非常广泛。抱杆结构属于高耸结构,其主要问题是稳定问题。随着输送电压的提高,抱杆高度也随之增加,其稳定问题尤为突出。已有的研究多针对某一具体工程,不具有普遍性。另外,抱杆所使用的材料、抱杆高度、抱杆节间的长度等因素都对抱杆结构的性能有不同程度的影响,目前的研究尚不够深入。受陕西送变电工程公司委托,对□800×40000mm全钢抱杆进行了负荷试验,试验分三种工况对抱杆施加荷载,分别测出了三种工况下各个测点的应力、应变以及变形值,检验了抱杆的强度、稳定性及变形性能。以试验为基础,采用有限元分析软件建立了抱杆空间三维模型,计算出三种工况下各个测点的应力、应变,并与试验值对比;对抱杆进行了模态分析,得到了抱杆的基本频率以及抱杆结构的各阶模态运动形式;对抱杆结构进行了特征值屈曲分析。研究表明:试验抱杆在三种工况下的强度、稳定性及变形均满足设计要求;抱杆结构易发生整体失稳,在设计与使用中,注意加强拉索的刚度以增加抱杆的稳定性能。更多还原

【Abstract】 With the increasing capacity of power plants, power transmission is gradually characterized longer transmission lines and higher voltage. Most of power-transmission tower were built in mountain and suburban region. Holding pole, which is simple, good stable performance, high efficiency, few machinery equipment, small footprint, economy and security, is a widely used lifting tool.The holding pole, which is a high-rise structure, has a shortcoming of instability. The height of holding pole was increased with the increase of power transmission voltage. The instability of holding pole became more and more serious with its height increased to meet the increased power transmission voltage. There are few research which can be utilized in general projects, most of research results can only be utilized in some specific project. There are several factors which affect the performance of hold-pole, for example, material used, height, length of inter-section, etc. The current study is still not enough.Commissioned by the Shaanxi Transmission and Distribution Company, this paper carried on a load test on a 800×40000mm all-steel holding pole. Holding pole loading test were performed under three kinds of condition and stress, strain and deformation features were measured at each test point. Results show that the hold-pole passed strength, stability and variability test.A 3-dimensional model was constructed by finite element analysis software based on experimental data. Strength, stability and variability data of each test point were computed by the software and compared with the experimental results. Analyzes the mode of holding pole, and obtains basic frequency as well as various steps modality movement form of holding pole and carries on the eigenvalue buckling analysis.Research results show that our proposed holding pole model can meet the requirement of design in strength, stability and variability. But overall structure stability is liable to lost. Stiffness of bracing-wire should be increased in designing and applications to improve stability of hold-pole, this is very important.更多还原