發(fā)布時間：2018-05-25 01:37

  本文選題：月牙肋岔管 + 三維參數(shù)化設(shè)計　； 參考：《廣西大學(xué)》2014年碩士論文

【摘要】：水電站引水系統(tǒng)采用集中供水和分組供水時,管道分流需要設(shè)置分岔管,其是管道體系的重要組成部位,被認(rèn)為是管道系統(tǒng)的“咽喉”。分岔管有多種結(jié)構(gòu)型式,月牙肋岔管是其中一種,因其具有受力明確、結(jié)構(gòu)合理和制作安裝難度較低等優(yōu)點,在國內(nèi)外大中型電站,尤其是抽水蓄能電站中得到了廣泛的應(yīng)用。然而,月牙肋岔管由空間薄殼和內(nèi)加強(qiáng)月牙肋構(gòu)成,其傳力體系復(fù)雜,結(jié)構(gòu)設(shè)計繁瑣,現(xiàn)設(shè)計方法是在多個假設(shè)基礎(chǔ)上推導(dǎo)得到的,難于準(zhǔn)確地進(jìn)行結(jié)構(gòu)安全評估。同時,月牙肋岔管內(nèi)壓通常較高,靠近廠房,一旦發(fā)生事故將造成重大生命和財產(chǎn)損失。鑒于此,論文在課題組以往研究工作基礎(chǔ)上,針對月牙肋岔管,開展了三維參數(shù)化設(shè)計與安全評估研究： (1)提出了月牙肋岔管三維參數(shù)化設(shè)計的方法。通過聯(lián)合應(yīng)用程序化語言、設(shè)計和分析軟件,實現(xiàn)了月牙肋岔管的三維參數(shù)化設(shè)計,可以顯著提高該結(jié)構(gòu)的設(shè)計效率。 (2)提出了基于應(yīng)力的月牙肋岔管安全評估方法。研究確定了月牙肋岔管結(jié)構(gòu)分析模型的范圍和邊界條件,分析了結(jié)構(gòu)響應(yīng)的主要影響因素和工程規(guī)律,引入熱點應(yīng)力和承載比,提出了有效的基于應(yīng)力的月牙肋岔管安全評估方法。 (3)提出了基于內(nèi)力的月牙肋岔管安全評估方法。采用由結(jié)點力求解斷面內(nèi)力的方法,提出肋板結(jié)構(gòu)的安全評估方法,同時引入板殼結(jié)構(gòu)的廣義屈服準(zhǔn)則,提出基于內(nèi)力的月牙肋岔管安全評估方法。
[Abstract]:When centralized water supply and grouped water supply are adopted in the diversion system of hydropower stations, bifurcation pipes are required for pipe diversion, which is an important part of the pipeline system and is considered to be the "throat" of the pipeline system. There are many structural types of bifurcation pipe, and crescent rib bifurcation pipe is one of them. Because of its advantages such as clear force, reasonable structure and low difficulty in fabrication and installation, it has been widely used in large and medium-sized power stations at home and abroad, especially in pumped storage power stations. However, the branch tube of crescent rib is composed of space thin shell and inner strengthened crescent rib, its transmission system is complex and the structure design is complicated. The present design method is derived on the basis of many hypotheses, and it is difficult to accurately evaluate the structural safety. At the same time, the inner pressure of the crescent rib bifurcation pipe is usually high and close to the factory building, which will cause great loss of life and property in the event of an accident. In view of this, based on the previous research work of the research group, the paper carried out the three-dimensional parametric design and safety evaluation research for the crescent rib bifurcation pipe. A three-dimensional parameterized design method of crescent rib bifurcation pipe is presented. The 3D parameterized design of the crescent rib bifurcation pipe is realized by combining the programming language with the design and analysis software, and the design efficiency of the structure can be improved significantly. A stress-based method for evaluating the safety of crescent rib bifurcation pipe is proposed. The range and boundary conditions of the structural analysis model of the crescent rib bifurcation pipe are determined, the main influencing factors and engineering rules of the structural response are analyzed, and the hot spot stress and load ratio are introduced. An effective method for evaluating the safety of crescent rib bifurcation pipe based on stress is presented. A method for evaluating the safety of crescent rib bifurcation pipe based on internal force is proposed. By using the method of seeking to solve the internal force of the cross section by the node, the safety assessment method of the ribbed structure is put forward. At the same time, the generalized yield criterion of the plate and shell structure is introduced, and the method of evaluating the safety of the crescent rib bifurcation pipe based on the internal force is put forward.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV732.43

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本文編號：1931513