【摘要】：在變電站及其他鋼結(jié)構(gòu)設(shè)計(jì)中,鋼節(jié)點(diǎn)起到連接各桿件,保證結(jié)構(gòu)充分發(fā)揮其功能的重要作用,是設(shè)計(jì)者工作中的重中之重。鋼管相貫節(jié)點(diǎn)在實(shí)際工程中應(yīng)用較早,范圍較廣,其力學(xué)性能已得到相對(duì)充分的研究,已得出相應(yīng)的力學(xué)理論公式可供設(shè)計(jì)者參考。插板節(jié)點(diǎn)因其安裝施工便捷、制作工藝簡單、運(yùn)輸方便等優(yōu)勢(shì),近些年逐漸被廣泛應(yīng)用于工程中。有關(guān)其力學(xué)性能的研究較少,國內(nèi)外有關(guān)規(guī)范尚有欠缺。因此,同時(shí)具有相貫節(jié)點(diǎn)和插板節(jié)點(diǎn)特征的鋼管節(jié)點(diǎn)在工程應(yīng)用和理論分析中具有很重要的研究意義。本文以220kV風(fēng)帆式聯(lián)合構(gòu)架變電站工程為背景,對(duì)構(gòu)架中的空間節(jié)點(diǎn)足尺模型進(jìn)行了靜力加載試驗(yàn)和非線性有限元分析。文中所研究的多支管空間節(jié)點(diǎn)同時(shí)具有相貫節(jié)點(diǎn)和插板節(jié)點(diǎn)的特征。在足尺模型試驗(yàn)中,詳細(xì)介紹了加載方案、布片方案、測(cè)試方案,并對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行了分析;針對(duì)5種荷載工況,研究了節(jié)點(diǎn)在1.5倍各工況設(shè)計(jì)荷載下的力學(xué)性能,了解了節(jié)點(diǎn)在各加載階段的應(yīng)力分布及發(fā)展情況,分別得出5種工況下各測(cè)點(diǎn)的應(yīng)力發(fā)展曲線;由試驗(yàn)可知,加載結(jié)束時(shí),節(jié)點(diǎn)各測(cè)點(diǎn)應(yīng)力均未超過材料的屈服強(qiáng)度,節(jié)點(diǎn)并無明顯變形。在試驗(yàn)的基礎(chǔ)上,同時(shí)考慮了材料非線性和幾何非線性,建立了節(jié)點(diǎn)有限元模型,嚴(yán)格按照試驗(yàn)加載制度,對(duì)節(jié)點(diǎn)進(jìn)行了有限元分析。分別針對(duì)5種工況,得出各測(cè)點(diǎn)應(yīng)力發(fā)展的數(shù)值模擬解、荷載-位移曲線、破壞形式及極限承載力。結(jié)果表明,試驗(yàn)結(jié)果和有限元結(jié)果吻合良好,節(jié)點(diǎn)在各工況下的極限承載力較大。節(jié)點(diǎn)設(shè)計(jì)安全合理,從而保證了變電站工程的安全性。
[Abstract]:In the design of substation and other steel structures, the steel joint plays an important role in connecting the members and ensuring the structure to give full play to its function, which is the most important task in the designer's work. The intersected steel pipe joints have been used in practical engineering earlier and have a wide range. The mechanical properties of the joints have been studied sufficiently and the corresponding mechanical theoretical formulas can be used for reference by designers. Because of the advantages of convenient installation and construction, simple manufacturing technology and convenient transportation, the splint joint has been widely used in engineering in recent years. There are few researches on its mechanical properties, and the relevant codes at home and abroad are still lacking. Therefore, the steel pipe joints with the characteristics of intersecting joints and plate joints are of great significance in engineering application and theoretical analysis. In this paper, the static loading test and nonlinear finite element analysis of the full-scale model of the spatial node in the frame are carried out under the background of the 220kV windsurfing combined frame substation project. In this paper, the multi-branch tubular space node has the characteristics of the intersecting node and the interlocking joint. In the full-scale model test, the loading scheme, the cloth scheme and the test scheme are introduced in detail, and the test data are analyzed. According to five load conditions, the mechanical properties of the joints under 1.5 times design load are studied, and the stress distribution and development of the joints at each loading stage are understood, and the stress development curves of each measuring point under five conditions are obtained respectively. The test results show that at the end of loading, the stress at each measuring point of the joint does not exceed the yield strength of the material, and there is no obvious deformation of the joint. On the basis of the experiment, considering the material nonlinearity and the geometric nonlinearity, the finite element model of the joint is established, and the finite element analysis of the joint is carried out strictly according to the test loading system. The numerical simulation solution, load-displacement curve, failure form and ultimate bearing capacity of each measuring point are obtained according to five working conditions. The results show that the test results are in good agreement with the finite element results, and the ultimate bearing capacity of the joints under various conditions is larger. The node design is safe and reasonable, thus ensuring the safety of substation engineering.
【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
【分類號(hào)】：TM63

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