变电站在役避雷针塔受力分析与剩余寿命评估

发布时间：2018-04-01 20:29

本文选题：避雷针塔　切入点：静力分析　出处：《天津大学》2014年硕士论文

【摘要】：长期服役的避雷针塔易存在倾倒的安全隐患。目前防止避雷针塔倾倒的有效方法是对长期服役的避雷针塔进行更换,对其全部更换所产生的费用数额巨大,盲目的更换更会造成资金资源的浪费。因此,本研究对这些已经长期服役避雷针塔进行安全性评估,确定是否可以继续服役。本文的主要工作可分为三部分。(1)根据避雷针塔的结构特点,建立有限元分析模型,进行静力学分析。通过对避雷针塔的有限元分析得知,其受到的最大的综合应力分布在5m高度处,具体数据为σmax=113.8MPa,最大变形发生在顶端,具体数据为Smax=453.3 mm。(2)根据避雷针塔静力学分析结果,选取受力较小部位和较大部位的试样进行了金相检验,扫描电镜检验,拉伸试验、冲击试验和疲劳试验。结果表明,除疲劳试验呈现出受力较大部位疲劳强度下降外,其余性能均表现出相近的水平,并且差距不大。(3)根据避雷针塔静力学分析结果,对危险点进行极限承载力与剩余寿命分析。结果表明,在基本风压W0=1.026KN/m2时,最大变形发生在顶端,具体数据为Smax=930.1 mm,最大综合应力σmax=233 MPa接近于Q235钢的屈服强度235MPa。该类型避雷针塔的最小寿命为10000天,这种型避雷针塔在这样的工作环境下可以连续工作27.40年。
[Abstract]:Lightning rod towers in service for a long time are vulnerable to potential safety hazards of dumping. At present, the effective way to prevent lightning rod towers from dumping is to replace them for a long time, and the total cost of replacing them is huge. Blind replacement will lead to a waste of money and resources. Therefore, the safety of these long-serving lightning rod towers is evaluated in this study. The main work of this paper can be divided into three parts. (1) according to the structural characteristics of the lightning arrester tower, the finite element analysis model is established, and the static analysis is carried out. Through the finite element analysis of the lightning rod tower, it is known that, The maximum comprehensive stress is distributed at a height of 5 m, the specific data is 蟽 maxmax 113.8MPa, the maximum deformation occurs at the top, and the specific data is Smax=453.3 mm.t2) according to the results of static analysis of lightning arrester tower, Metallographic examination, scanning electron microscope test, tensile test, impact test and fatigue test were carried out on the specimens of the smaller and larger parts. The results showed that the fatigue strength of the larger part was decreased except the fatigue test. The other performances show a similar level, and the gap is not big. (3) according to the results of static analysis of lightning rod tower, the ultimate bearing capacity and residual life of the dangerous point are analyzed. The results show that the maximum deformation occurs at the top when the basic wind pressure is W0=1.026KN/m2. The concrete data is Smax=930.1. The maximum comprehensive stress 蟽 max=233 MPa is close to the yield strength of Q235 steel. The minimum life of this type of lightning rod tower is 10000 days, and this type of lightning rod tower can work continuously for 27.40 years in this working environment.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63;TM862

【参考文献】