六七式鐵路舟橋動(dòng)力學(xué)特性的研究
發(fā)布時(shí)間：2018-10-09 09:49
【摘要】：相較于傳統(tǒng)橋梁而言,由于浮橋在執(zhí)行短期、應(yīng)急任務(wù)時(shí)更加高效便捷,節(jié)省費(fèi)用,因此逐漸得到越來越廣泛的應(yīng)用。國內(nèi)外許多學(xué)者對于浮橋的力學(xué)特性開展了不同程度的理論探索和試驗(yàn)研究。然而,這些方法絕大多數(shù)都是將浮橋所處的流體視為靜止?fàn)顟B(tài),即只考慮了靜水的浮力作用,并未考慮不同水波狀態(tài)下(諸如水深、水波方向、浪高以及圓頻率等因素)對于浮橋所產(chǎn)生的影響�；谶@樣一種研究現(xiàn)狀,本文從全新的角度入手,尋找到了一種假設(shè)更為合理并且可以用來進(jìn)行浮橋水動(dòng)力作用分析的方法。論文首先從一個(gè)簡單浮體模型入手,利用勢流理論并借助數(shù)學(xué)手段,給出了浮體速度勢各部分的表達(dá)形式,并推導(dǎo)出了流場所要滿足的邊界條件;其次基于格林第三公式,利用三維源匯理論求解出了流場速度勢;再次,將作用在浮橋不同部位上的各種靜載和動(dòng)載加以耦合,根據(jù)頻域和時(shí)域相關(guān)分析理論,借助有限元相關(guān)知識(shí),推導(dǎo)出了浮橋動(dòng)力學(xué)方程。通過對該方程進(jìn)行求解,即可以計(jì)算出水波、列車等荷載作用下浮橋梁部內(nèi)力、位移、加速度、撓度、轉(zhuǎn)角等力學(xué)參數(shù)的變化情況。這就為浮橋水動(dòng)力學(xué)的理論研究提供了一種新的思路和方法。為了充分論證本文研究方法的可靠性,以一座浮橋?qū)嵗秊樵囁隳Ｐ?通過利用本文方法所算得的結(jié)果與參考文獻(xiàn)中借助軟件模擬所求得的結(jié)果相比較,發(fā)現(xiàn)二者在數(shù)值上非常接近,這就說明本論文所研究的方法是正確的,同時(shí)具有普遍適用性,可用于水波作用下的各種浮橋的水動(dòng)力學(xué)特性分析。接著,以京山線薊運(yùn)河六七式搶修鐵路舟橋作為工程實(shí)例展開研究,利用前文中所推導(dǎo)出的方法對該六七式鐵路舟橋進(jìn)行動(dòng)力學(xué)特性的分析,討論諸如波高、圓頻率以及入射波角度等波相關(guān)參數(shù)變化對浮橋所產(chǎn)生的影響。最后,在此基礎(chǔ)上又研究了水波和列車荷載聯(lián)合作用下浮橋水動(dòng)力學(xué)特性的研究,同時(shí)討論了不同軸重、不同車速下舟橋的通載情況。
[Abstract]:Compared with traditional bridges, floating bridges are more and more widely used because of their short-term, more efficient and convenient emergency tasks and less cost. Many scholars at home and abroad have carried out theoretical and experimental research on the mechanical properties of floating bridges to varying degrees. However, most of these methods treat the fluid in the floating bridge as a static state, that is, only the buoyancy of the static water is considered, but not in different water wave states (such as water depth, water wave direction, etc.) The influence of wave height and circular frequency on the floating bridge. Based on this kind of research status, this paper starts with a new point of view, and finds a method that is more reasonable and can be used to analyze the hydrodynamic action of floating bridge. This paper starts with a simple floating body model, using the potential flow theory and mathematical means, gives the expression form of each part of the velocity potential of floating body, and deduces the boundary conditions to be satisfied by the flow site, secondly, based on Green's third formula, The velocity potential of the flow field is solved by using the three-dimensional theory of source and sink. Thirdly, various static and dynamic loads acting on different parts of the floating bridge are coupled. According to the theory of correlation analysis in frequency domain and time domain, the knowledge of finite element is used. The dynamic equation of floating bridge is derived. By solving the equation, the variation of mechanical parameters such as internal force, displacement, acceleration, deflection and angle of the floating bridge beam can be calculated under the action of water wave and train. This provides a new idea and method for the theoretical study of hydrodynamics of floating bridges. In order to fully demonstrate the reliability of the research method in this paper, a floating bridge example is taken as a trial calculation model. The results obtained by using the method in this paper are compared with those obtained by software simulation in the reference. It is found that the two methods are very close to each other numerically, which shows that the method studied in this paper is correct and can be used to analyze the hydrodynamic characteristics of various floating bridges under the action of water waves. Then, taking Jiyue railway boat bridge of Jingshan line as an engineering example, the dynamic characteristics of the six or seven type railway boat bridge are analyzed by using the method deduced in the previous paper, and the wave height, for example, is discussed. The influence of the variation of wave parameters such as circular frequency and incident wave angle on the floating bridge. Finally, the hydrodynamic characteristics of the pontoon bridge under the combined action of water wave and train load are studied. At the same time, the on-load of the pontoon bridge under different axle loads and different speeds is discussed.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3
本文編號(hào)：2258895
[Abstract]:Compared with traditional bridges, floating bridges are more and more widely used because of their short-term, more efficient and convenient emergency tasks and less cost. Many scholars at home and abroad have carried out theoretical and experimental research on the mechanical properties of floating bridges to varying degrees. However, most of these methods treat the fluid in the floating bridge as a static state, that is, only the buoyancy of the static water is considered, but not in different water wave states (such as water depth, water wave direction, etc.) The influence of wave height and circular frequency on the floating bridge. Based on this kind of research status, this paper starts with a new point of view, and finds a method that is more reasonable and can be used to analyze the hydrodynamic action of floating bridge. This paper starts with a simple floating body model, using the potential flow theory and mathematical means, gives the expression form of each part of the velocity potential of floating body, and deduces the boundary conditions to be satisfied by the flow site, secondly, based on Green's third formula, The velocity potential of the flow field is solved by using the three-dimensional theory of source and sink. Thirdly, various static and dynamic loads acting on different parts of the floating bridge are coupled. According to the theory of correlation analysis in frequency domain and time domain, the knowledge of finite element is used. The dynamic equation of floating bridge is derived. By solving the equation, the variation of mechanical parameters such as internal force, displacement, acceleration, deflection and angle of the floating bridge beam can be calculated under the action of water wave and train. This provides a new idea and method for the theoretical study of hydrodynamics of floating bridges. In order to fully demonstrate the reliability of the research method in this paper, a floating bridge example is taken as a trial calculation model. The results obtained by using the method in this paper are compared with those obtained by software simulation in the reference. It is found that the two methods are very close to each other numerically, which shows that the method studied in this paper is correct and can be used to analyze the hydrodynamic characteristics of various floating bridges under the action of water waves. Then, taking Jiyue railway boat bridge of Jingshan line as an engineering example, the dynamic characteristics of the six or seven type railway boat bridge are analyzed by using the method deduced in the previous paper, and the wave height, for example, is discussed. The influence of the variation of wave parameters such as circular frequency and incident wave angle on the floating bridge. Finally, the hydrodynamic characteristics of the pontoon bridge under the combined action of water wave and train load are studied. At the same time, the on-load of the pontoon bridge under different axle loads and different speeds is discussed.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 辛實(shí);鐵路浮橋結(jié)構(gòu)的整體分析[J];鐵道建筑技術(shù);1995年03期
，本文編號(hào)：2258895
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