【摘要】：變電站構(gòu)架是變電站內(nèi)重要的建筑物之一,主要用于懸掛站內(nèi)外各類(lèi)導(dǎo)地線。國(guó)內(nèi)現(xiàn)有構(gòu)架種類(lèi)較多,技術(shù)相對(duì)成熟,但是一直存在占地面積較大的缺陷,隨著國(guó)家城鎮(zhèn)化進(jìn)程發(fā)展,地價(jià)昂貴,變電站建設(shè)費(fèi)用逐年增高,因此必須要改變以往的出線方案,壓縮出線間隔,減小構(gòu)架的占地面積。受雙層出線構(gòu)架啟發(fā),針對(duì)戶外GIS變電站,創(chuàng)新性設(shè)計(jì)出了風(fēng)帆式聯(lián)合出線方案,通過(guò)與電氣專(zhuān)業(yè)配電裝置的優(yōu)化相結(jié)合,將傳統(tǒng)的水平出線改為立式出線,較常規(guī)構(gòu)架減小占地面積達(dá)50%。由于立式出線較常規(guī)的水平出線更為緊湊,使得單跨結(jié)構(gòu)受導(dǎo)線拉力增加一倍,因此構(gòu)架柱內(nèi)桿件布置型式顯得尤為重要。采用連續(xù)結(jié)構(gòu)拓?fù)鋬?yōu)化中的人工密度法優(yōu)化風(fēng)帆式構(gòu)架平面布置型式,以構(gòu)架柱為輪廓將優(yōu)化模型簡(jiǎn)化為一塊板,設(shè)置合理的位移約束條件,以體積最小化為優(yōu)化目標(biāo),通過(guò)保留所有指定密度閾值以上的單元,得到構(gòu)架平面內(nèi)的最優(yōu)布置。針對(duì)構(gòu)架三層出線特點(diǎn),研究了兩種端撐布置形式對(duì)構(gòu)架位移的影響,并進(jìn)行了優(yōu)選。對(duì)比分析了常規(guī)構(gòu)架柱頂節(jié)點(diǎn)和新型柱頂節(jié)點(diǎn)的結(jié)構(gòu)型式,結(jié)合鋼結(jié)構(gòu)經(jīng)濟(jì)合理、安全適用、確保質(zhì)量的設(shè)計(jì)準(zhǔn)則,提出了全新的梁柱節(jié)點(diǎn)構(gòu)造方案。依據(jù)構(gòu)架型式和節(jié)點(diǎn)布置方案建立整體構(gòu)架有限元模型,根據(jù)不同工況組合統(tǒng)計(jì)出的各位置最不利應(yīng)力比。結(jié)合結(jié)構(gòu)力學(xué)性能和鋼結(jié)構(gòu)構(gòu)造要求,確定各部分結(jié)構(gòu)型鋼型號(hào),并選取鋼管的連接法蘭。分析了新型構(gòu)架的支反力、應(yīng)力比、位移和屈曲系數(shù)等力學(xué)性能。并在線性屈曲失穩(wěn)計(jì)算結(jié)果基礎(chǔ)上,分析構(gòu)架在側(cè)向風(fēng)作用下的非線性失穩(wěn)情況。利用多重Ritz向量法計(jì)算結(jié)構(gòu)的振型基頻與振型參與質(zhì)量,采用地震設(shè)計(jì)反應(yīng)譜法校核了結(jié)構(gòu)在地震作用下的強(qiáng)度和剛度。建立構(gòu)架梁柱節(jié)點(diǎn)三維有限元模型,分析其在控制工況作用下的應(yīng)力和變形情況。結(jié)果表明風(fēng)帆式聯(lián)合出線構(gòu)架安全可靠,經(jīng)濟(jì)合理。
[Abstract]:Substation frame is one of the most important buildings in substation. There are many kinds of existing frameworks in China, and the technology is relatively mature, but there are always defects of occupying large areas. With the development of the national urbanization process, the land price is expensive, and the cost of substation construction is increasing year by year. Therefore, it is necessary to change the previous exit plan, reduce the space of the frame. Inspired by the bilayer outline frame, this paper innovatively designs the windsurfing joint outlet scheme for outdoor GIS substation. By combining with the optimization of electrical professional distribution equipment, the traditional horizontal outlet line is changed to vertical outlet line. Compared with the conventional frame to reduce the area of up to 50. Because the vertical output line is more compact than the conventional horizontal outlet line, the single span structure is doubled by the wire tension, so it is very important to arrange the bar in the frame column. The artificial density method in topology optimization of continuous structure is used to optimize the plane layout of the sails frame. The optimization model is simplified into a plate with the outline of the frame column, and the reasonable displacement constraint condition is set, and the volume minimization is turned into the optimization objective. By retaining all the elements above the specified density threshold, the optimal arrangement in the frame plane is obtained. According to the characteristics of the three-story frame, the influence of two kinds of end-brace arrangement on the displacement of the frame is studied, and the optimum selection is carried out. This paper compares and analyzes the structural types of the column top joint of the conventional frame and the new type of column top joint, and puts forward a new construction scheme of the Liang Zhu joint combining with the design criteria of the steel structure which is economical and reasonable, safe and applicable, and ensuring the quality. The finite element model of the whole frame is established according to the frame type and the joint arrangement scheme, and the most unfavorable stress ratio of each position is calculated according to the different working condition combination. According to the structural mechanical properties and structural requirements of steel structure, the steel type of each part of the structure is determined, and the connecting flange of steel pipe is selected. The mechanical properties of the new frame, such as support force, stress ratio, displacement and buckling coefficient, are analyzed. Based on the calculation results of linear buckling instability, the nonlinear instability of the frame subjected to lateral wind is analyzed. The fundamental frequency of vibration mode and the participating mass of modes are calculated by using multiple Ritz vector method, and the strength and stiffness of the structure under earthquake action are checked by seismic design response spectrum method. The three dimensional finite element model of Liang Zhu joints is established, and the stress and deformation of Liang Zhu joints under controlled working conditions are analyzed. The results show that the windsurfing joint outlet frame is safe, reliable and economical.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM63

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