输电线路格构式结构风荷载特性研究

发布时间：2018-05-05 16:06

本文选题：三角塔 + 全联合变电构架　；参考：《湖南大学》2015年硕士论文

【摘要】：随着我国经济和社会的发展,我国对能源的需求越来越大,其中电力资源由于其输送方便、清洁卫生等优点而被广泛应用于我们生产生活的方方面面。正是由于电力资源的深入普及及其与我们的息息相关性,其能否安全顺利运行会对我们的生产和生活产生重要影响。而影响电力运行安全的其中一个重要威胁就是由于风灾造成的输变电结构的破坏。而本文正是基于此,以风洞试验为基础结合有限元模拟的方式对输变电格构式结构的风荷载特性进行了研究,得出了一些实用结论。主要研究内容如下:(1)输电塔架体型系数测试。通过对三角形角钢塔架和钢管-角钢组合塔架进行风洞试验,得到了三角形塔架体型系数的变化规律。将角钢塔架风洞测试的体型系数值与现行规范取值进行对比分析发现测试值比建筑结构荷载规范取值大11%左右,规范取值偏于不安全。最后提出了一种关于钢管-角钢组合塔架风荷载体型系数的取值方法,补充国内现行规范对此类结构体型系数定义的不足。(2)全联合变电构架体型系数测试。通过对全联合构架进行干扰系数的风洞测试,得到不同位置处的横梁相应的干扰系数取值。在单梁体型系数测试值和不同位置处横梁相应的干扰系数测试值的基础上,将二者相乘得到全联合构架最终的横梁体型系数取值。(3)全联合变电构架风振响应分析。根据谐波合成法的原理对全联合变电构架的脉动风速时程进行数值模拟,由得到的脉动风速时程数据,通过对全联合变电构架建立有限元模型,以时域分析的方法对其风振响应进行了有限元分析,计算了不同阻尼比、不同约束条件情况下结构的风振响应。通过选取结构典型位置处的结果进行比较分析,介绍对结构风振产生显著影响的一些主要诱因。(4)全联合变电构架风振系数分析。在全联合变电构架风振响应分析的结果的基础上,根据Davenport提出的阵风荷载因子法通过编制MATLAB程序对其风振系数进行计算。并研究了不同阻尼比、不同支座约束形式对其产生的影响,同时将计算结果与现行规范中风振系数的取值进行比较,发现高耸结构设计规范和建筑结构荷载规范(按高耸结构)的取值过于保守,比计算值均大10%以上,最大甚至大37%;而计算值与变电站建筑结构设计规程的取值相对较为接近,且其沿高度方向的变化规律也与其一致。
[Abstract]:With the development of our economy and society, the demand for energy in our country is increasing, among which the power resources are widely used in all aspects of our production and life because of its advantages of convenient transportation, clean and sanitary, etc. It is precisely because of the popularization of power resources and its close relationship with us that its safe and smooth operation will have an important impact on our production and life. One of the important threats to the safety of electric power operation is the destruction of transmission and transformation structure caused by wind disaster. Based on the wind tunnel test and finite element simulation, this paper studies the wind load characteristics of grid structure of transmission and transformation, and draws some practical conclusions. The main contents of this study are as follows: 1) Measurement of transmission tower shape coefficient. Through wind tunnel test on triangle angle steel tower and steel pipe-angle steel composite tower, the variation law of shape coefficient of triangle tower is obtained. By comparing the shape coefficient of the wind tunnel test of angle steel tower frame with the current code, it is found that the test value is about 11% larger than the value of the code for building structure load, and the value of the code is more unsafe than that of the code for building structure. In the end, a method for determining the wind load shape coefficient of steel pipe / angle steel composite tower is proposed, which complements the lack of definition of shape coefficient of this kind of structure in the current domestic code. 2) the shape coefficient of the fully combined transformer truss is tested. Through the wind tunnel test of the interference coefficient of the whole joint frame, the corresponding interference coefficients of the beams at different positions are obtained. On the basis of the test value of single beam shape coefficient and the corresponding interference coefficient at different positions, the wind vibration response analysis of the whole joint truss is obtained by multiplying the two values to obtain the final shape coefficient of the cross beam of the whole joint frame. According to the principle of harmonic synthesis method, the pulse wind speed time history of fully combined substation frame is numerically simulated. Based on the obtained pulsating wind speed time history data, a finite element model is established for the fully combined substation frame. The response of wind-induced vibration is analyzed by finite element method in time domain, and the wind-induced vibration response of the structure under different damping ratio and constraint condition is calculated. By comparing and analyzing the results of selecting the typical location of the structure, this paper introduces some main inducements, I. e., the wind vibration coefficient analysis of the fully combined substation frame, which has a significant effect on the wind vibration of the structure. Based on the results of wind vibration analysis of fully combined substation frame, the wind vibration coefficient is calculated by compiling MATLAB program according to the gust load factor method proposed by Davenport. The effects of different damping ratios and different bearing constraints on the damping ratio are also studied. The calculated results are compared with the values of wind-induced vibration coefficients in the current code. It is found that the values of the design code for high-rise structures and the load codes for building structures (according to high-rise structures) are too conservative, which are more than 10% larger than the calculated values, and the maximum value is even larger than 37%, while the calculated values are relatively close to those of the design rules for substation structures. And its variation along the height direction is consistent with it.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU312.1

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