本文選題：既有鐵路橋梁　切入點：強度、剛度衰減　出處：《長安大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著我國經(jīng)濟水平的日益提高,交通事業(yè)蒸蒸日上。在政府幾十年以來的大力投資下,我國公路、鐵路網(wǎng)得到了巨大的發(fā)展。就目前整體情況來說,我國鐵路網(wǎng)已經(jīng)基本成熟,在可以預見的未來數(shù)十年內(nèi),新建工程有所減少。同時,國內(nèi)許多運營時間較長的鐵路橋梁會出現(xiàn)不同程度的病害,會對交通運輸造成安全隱患。因此,對于該種橋梁的檢測、維修、養(yǎng)護、加固及改造工程就不可避免。從國內(nèi)外普遍建設(shè)運營情況看,對舊橋進行加固、改造具有良好的經(jīng)濟、社會效益,且重新投入運行后表現(xiàn)良好,性能完全滿足現(xiàn)有標準。目前,我國有關(guān)橋梁加固設(shè)計與計算的研究開展還相對比較相對滯后,不能滿足日益增多的加固需求。本文以破損情況較為典型的既有鐵路橋梁(清姜河鐵路橋)為研究目標,對其進行了實地檢測。對該橋梁的病害情況進行了詳細的描述并以太行1內(nèi)燃機車對其分別進行了靜力荷載和動力荷載試驗研究,得出跨中撓度、混凝土應(yīng)變、鋼筋應(yīng)變等主要工程數(shù)據(jù)。將2013年的數(shù)據(jù)與2006年的清江河鐵路橋檢測報告進行了對比分析,得出了其強度、剛度衰減的一些特點和規(guī)律,并對強度以及剛度衰減后的橋梁的加固補強效果進行了分析評價。然后利用Midas/civil有限元軟件建立了該橋梁其中一跨的П型梁有限元模型。利用所建立的橋梁π形梁實體模型,分別對其進行增大橫截面、粘貼一定尺寸和厚度的碳纖維布、粘貼8mm厚度的鋼板處理,然后進行計算分析。通過軟件計算結(jié)果分析這三種措施對該π形梁正截面的極限抗彎承載力、撓度、剛度以及塑性變形能力等多方面的影響。最后歸納出這三種方法對于本項工程的適用性,方便實際工程的應(yīng)用。
[Abstract]:In recent years, with the development of our country's economic level, the transportation industry is booming. Thanks to the government's strong investment in the past decades, the highway and railway networks in our country have been greatly developed. As far as the overall situation is concerned, China's railway network has been basically mature, in the foreseeable future decades, the number of new projects has decreased. At the same time, many domestic railway bridges with longer operating time will have different degrees of disease. Therefore, for the detection, maintenance, maintenance, reinforcement and reconstruction of this kind of bridge, it is inevitable. From the general construction and operation situation at home and abroad, strengthening and rebuilding the old bridge has a good economy. At present, the research on bridge reinforcement design and calculation in China is relatively lagging behind. The purpose of this paper is to study the existing railway bridges (Qingjiang River Railway Bridge), which are typical of the damaged situation. The damage of the bridge is described in detail, and the static load and dynamic load of the bridge are studied by using Taihang No. 1 diesel locomotive. The deflection of span and the strain of concrete are obtained. By comparing the data of 2013 with the test report of Qingjiang River Railway Bridge on 2006, some characteristics and rules of strength and stiffness attenuation are obtained. Then the finite element model of the bridge with one span is established by using the Midas/civil finite element software, and the solid model of the 蟺-shaped beam is established by using the model of the 蟺-shaped beam of the bridge, and the reinforcement effect of the bridge is analyzed and evaluated after the strength and stiffness of the bridge are attenuated. The cross section is enlarged, the carbon fiber cloth of certain size and thickness is pasted, and the steel plate with 8 mm thickness is treated. Then the calculation and analysis are carried out. The results of software calculation are used to analyze the ultimate flexural bearing capacity and deflection of the 蟺-shaped beam. Finally, the applicability of these three methods to this project is summarized, which is convenient for practical application.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U445.72

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本文編號：1567301