平地和山地风场下输电塔的风荷载相关问题研究

发布时间：2018-01-16 19:23

本文关键词：平地和山地风场下输电塔的风荷载相关问题研究　出处：《浙江大学》2015年硕士论文　论文类型：学位论文

【摘要】：近些年来我国的电力行业不断蓬勃发展,所以大量超高压大跨越输电塔不断兴建。同时,我国又是一个以山地地貌为主的国家,近65%的面积都是山地。大跨越输电塔由于跨越距离比较长,通常修建于山区附近,而山区的复杂地形会导致输电塔的风致响应生产一定的加速效应。因此,对输电塔在平地风场和山地风场下的风荷载相关问题进行研究有着重要的意义。首先,本文以一个长塔臂输电塔和一个常规输电塔为例,采用时域法、频域法、HFFB风洞试验以及气弹模型风洞试验四种方法对输电塔在平地风场下进行详细地风致响应分析。研究结果表明时域法计算时选取本征正交分解法、频域法计算时选取平方和开方法能够极大地提高计算效率。基于HFFB风洞试验数据通过分段估计各节点风荷载功率谱法求得的位移均方根沿高度变化趋势和时域法、频域法相同,数值上比时域法和频域法略大。其次,本文分别利用阵风荷载因子法、背景共振分别计算法计算得到两个典型输电塔在平地风场下的等效风荷载。并与基于HFFB风洞试验数据的结果进行了对比分析。分析结果表明基于HFFB风洞试验数据采用分段估计法得到等效风荷载稍小于GLF法和背景共振法得到的等效风荷载。最后本文按照缩尺比1：500的比例制作了两个不同直径的山丘模型,分别进行了单山和双山工况的试验。研究单山风场和双山风场的特征,并提取出典型单山风场和典型双山风场进行风洞试验模拟。对比常规输电塔在平地B类地貌、典型单山和典型双山风场下的风致响应和等效风荷载。最后将计算结果与各国规范进行详细比较。研究结果表明典型单山和典型双山风场下的等效风荷载比较接近,但是远大于平地B类地貌下的计算结果。
[Abstract]:In recent years, the power industry of our country has been booming, so a large number of ultra-high voltage large span transmission towers have been built. At the same time, China is also a country dominated by mountainous landforms. Nearly 65% of the area is mountainous. Long span transmission tower is usually built near the mountain area due to its long span distance, and the complex terrain in the mountain area will lead to a certain acceleration effect of wind induced response production of transmission tower. It is of great significance to study the wind load of transmission tower under the wind field of flat ground and mountain. Firstly, this paper takes a long tower with a long arm and a conventional transmission tower as an example, using time domain method and frequency domain method. HFFB wind tunnel test and Aeroelastic model wind tunnel test are used to analyze the wind induced response of transmission tower under the flat wind field in detail. The results show that the eigenorthogonal decomposition method is used in the calculation of time domain method. The calculation efficiency can be greatly improved by selecting the square sum method in frequency domain method. Based on the HFFB wind tunnel test data, the variation trend of displacement root-mean-square root along the height of each node is estimated by means of piecewise estimation of wind load power spectrum method. Time domain method. The frequency domain method is the same, and the numerical value is slightly larger than the time domain method and the frequency domain method. Secondly, this paper uses the array wind load factor method respectively. The equivalent wind load of two typical transmission towers under the flat wind field is calculated by the background resonance calculation method, and the results are compared with the results based on the HFFB wind tunnel test data. The results show that the two transmission towers are based on HFFB. The equivalent wind load obtained by using the piecewise estimation method is slightly smaller than that obtained by the GLF method and the background resonance method. Finally, according to the scale ratio of 1: 1, the equivalent wind load is obtained by the method of wind tunnel test. Two mound models with different diameters were made at a scale of 500. The characteristics of single mountain wind field and double mountain wind field were studied. The typical single mountain wind field and the typical double mountain wind field are extracted to simulate the wind tunnel test. The wind-induced responses and equivalent wind loads under typical single-hill and typical double-mountain wind fields are compared in detail with the codes of various countries. The results show that the equivalent wind loads under typical single-hill and typical double-mountain wind fields are compared in detail. Close. But it is much larger than the calculated results under the B geomorphology of the flat land.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1

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