本文選題：三角塔 + 全聯(lián)合變電構(gòu)架��； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)和社會(huì)的發(fā)展,我國(guó)對(duì)能源的需求越來(lái)越大,其中電力資源由于其輸送方便、清潔衛(wèi)生等優(yōu)點(diǎn)而被廣泛應(yīng)用于我們生產(chǎn)生活的方方面面。正是由于電力資源的深入普及及其與我們的息息相關(guān)性,其能否安全順利運(yùn)行會(huì)對(duì)我們的生產(chǎn)和生活產(chǎn)生重要影響。而影響電力運(yùn)行安全的其中一個(gè)重要威脅就是由于風(fēng)災(zāi)造成的輸變電結(jié)構(gòu)的破壞。而本文正是基于此,以風(fēng)洞試驗(yàn)為基礎(chǔ)結(jié)合有限元模擬的方式對(duì)輸變電格構(gòu)式結(jié)構(gòu)的風(fēng)荷載特性進(jìn)行了研究,得出了一些實(shí)用結(jié)論。主要研究?jī)?nèi)容如下:(1)輸電塔架體型系數(shù)測(cè)試。通過(guò)對(duì)三角形角鋼塔架和鋼管-角鋼組合塔架進(jìn)行風(fēng)洞試驗(yàn),得到了三角形塔架體型系數(shù)的變化規(guī)律。將角鋼塔架風(fēng)洞測(cè)試的體型系數(shù)值與現(xiàn)行規(guī)范取值進(jìn)行對(duì)比分析發(fā)現(xiàn)測(cè)試值比建筑結(jié)構(gòu)荷載規(guī)范取值大11%左右,規(guī)范取值偏于不安全。最后提出了一種關(guān)于鋼管-角鋼組合塔架風(fēng)荷載體型系數(shù)的取值方法,補(bǔ)充國(guó)內(nèi)現(xiàn)行規(guī)范對(duì)此類結(jié)構(gòu)體型系數(shù)定義的不足。(2)全聯(lián)合變電構(gòu)架體型系數(shù)測(cè)試。通過(guò)對(duì)全聯(lián)合構(gòu)架進(jìn)行干擾系數(shù)的風(fēng)洞測(cè)試,得到不同位置處的橫梁相應(yīng)的干擾系數(shù)取值。在單梁體型系數(shù)測(cè)試值和不同位置處橫梁相應(yīng)的干擾系數(shù)測(cè)試值的基礎(chǔ)上,將二者相乘得到全聯(lián)合構(gòu)架最終的橫梁體型系數(shù)取值。(3)全聯(lián)合變電構(gòu)架風(fēng)振響應(yīng)分析。根據(jù)諧波合成法的原理對(duì)全聯(lián)合變電構(gòu)架的脈動(dòng)風(fēng)速時(shí)程進(jìn)行數(shù)值模擬,由得到的脈動(dòng)風(fēng)速時(shí)程數(shù)據(jù),通過(guò)對(duì)全聯(lián)合變電構(gòu)架建立有限元模型,以時(shí)域分析的方法對(duì)其風(fēng)振響應(yīng)進(jìn)行了有限元分析,計(jì)算了不同阻尼比、不同約束條件情況下結(jié)構(gòu)的風(fēng)振響應(yīng)。通過(guò)選取結(jié)構(gòu)典型位置處的結(jié)果進(jìn)行比較分析,介紹對(duì)結(jié)構(gòu)風(fēng)振產(chǎn)生顯著影響的一些主要誘因。(4)全聯(lián)合變電構(gòu)架風(fēng)振系數(shù)分析。在全聯(lián)合變電構(gòu)架風(fēng)振響應(yīng)分析的結(jié)果的基礎(chǔ)上,根據(jù)Davenport提出的陣風(fēng)荷載因子法通過(guò)編制MATLAB程序?qū)ζ滹L(fēng)振系數(shù)進(jìn)行計(jì)算。并研究了不同阻尼比、不同支座約束形式對(duì)其產(chǎn)生的影響,同時(shí)將計(jì)算結(jié)果與現(xiàn)行規(guī)范中風(fēng)振系數(shù)的取值進(jìn)行比較,發(fā)現(xiàn)高聳結(jié)構(gòu)設(shè)計(jì)規(guī)范和建筑結(jié)構(gòu)荷載規(guī)范(按高聳結(jié)構(gòu))的取值過(guò)于保守,比計(jì)算值均大10%以上,最大甚至大37%;而計(jì)算值與變電站建筑結(jié)構(gòu)設(shè)計(jì)規(guī)程的取值相對(duì)較為接近,且其沿高度方向的變化規(guī)律也與其一致。
[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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU312.1

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本文編號(hào)：1848350