本文選題：曲軸構(gòu)件 + FRP��； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：近年來(lái)，不論國(guó)內(nèi)還是國(guó)外，隨著交通量的增大、車輛荷載的增加以及結(jié)構(gòu)損傷、材料不斷老化等多方面的原因，有很大一部分的現(xiàn)役橋梁出現(xiàn)了承載能力嚴(yán)重不足的現(xiàn)象，有些甚至出現(xiàn)了垮塌現(xiàn)象。鑒于此，關(guān)于現(xiàn)役的鋼筋混凝土橋梁的加固研究刻不容緩。 隨著加固理論與技術(shù)的發(fā)展，纖維增強(qiáng)材料（FRP）加固鋼筋混凝土橋梁得到了越來(lái)越廣泛的應(yīng)用。近些年，纖維增強(qiáng)材料加固梁橋無(wú)論從理論計(jì)算還是實(shí)際加固技術(shù)方面都日趨成熟，但是對(duì)于拱橋等曲軸形式橋梁的加固理論研究則相對(duì)較少，只停留在經(jīng)驗(yàn)方面，對(duì)于纖維增強(qiáng)材料加固曲軸構(gòu)件的界面粘結(jié)機(jī)理、界面破壞模式的研究還有待進(jìn)一步深入。 本文重點(diǎn)研究了FRP加固混凝土曲軸構(gòu)件的界面粘結(jié)機(jī)理。首先，文中通過(guò)對(duì)FRP加固的曲軸構(gòu)件試驗(yàn)研究的分析，回歸了界面應(yīng)變、粘結(jié)應(yīng)力以及粘結(jié)滑移關(guān)系等界面關(guān)鍵參數(shù)；利用界面粘結(jié)參數(shù)，借助通用有限元程序ABAQUS采用內(nèi)聚力模型對(duì)纖維加固鋼筋混凝土模型拱進(jìn)行了分析，并且與相應(yīng)文獻(xiàn)中的試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析，分析結(jié)果基本一致，從而驗(yàn)證了有限元模型的準(zhǔn)確性。其次，文中選取了鋼筋混凝土拱橋主拱圈上的一個(gè)微元體，利用彈性力學(xué)、材料力學(xué)及結(jié)構(gòu)力學(xué)的相關(guān)理論，，得到了FRP加固混凝土拱橋界面粘結(jié)剪應(yīng)力與剝離正應(yīng)力的計(jì)算公式，并通過(guò)試驗(yàn)結(jié)果驗(yàn)證了公式的合理性。 本文的研究為FRP加固混凝土曲軸形式橋梁提供了一個(gè)有效的界面粘結(jié)應(yīng)力計(jì)算方法，為以后FRP加固曲軸形式橋梁提供了理論指導(dǎo)以及借鑒意義。
[Abstract]:In recent years, with the increase of traffic volume, the increase of vehicle load, the damage of structure, the aging of materials and so on, a large part of active bridges have appeared the phenomenon of serious shortage of carrying capacity, both at home and abroad. Some have even collapsed. In view of this, it is urgent to study the reinforcement of existing reinforced concrete bridges. With the development of reinforcement theory and technology, reinforced concrete bridge strengthened with fiber reinforced material (FRP) has been applied more and more widely. In recent years, the reinforcement of beam bridges with fiber reinforced materials has become more and more mature in terms of theoretical calculation and practical reinforcement techniques. However, the theoretical study on the reinforcement of crankshaft bridges such as arch bridges is relatively few, and only stays in experience. The mechanism of interfacial bonding of crankshaft members strengthened with fiber reinforced materials and the study of interfacial failure mode need to be further studied. In this paper, the interfacial bonding mechanism of concrete crankshaft members strengthened with FRP is studied. Firstly, by analyzing the experimental study of crankshaft members strengthened by FRP, the key interface parameters such as interface strain, bond stress and bond-slip relationship are regressed. With the help of the universal finite element program ABAQUS, the cohesive force model is used to analyze the reinforced concrete model arch strengthened by fiber, and the results are compared with the experimental results in the corresponding literature. The results are basically consistent. The accuracy of the finite element model is verified. Secondly, a micro-element body on the main arch ring of reinforced concrete arch bridge is selected, and the theories of elastic mechanics, material mechanics and structural mechanics are used. The calculation formulas of bond shear stress and peeling normal stress at the interface of FRP reinforced concrete arch bridge are obtained, and the rationality of the formula is verified by the experimental results. The research in this paper provides an effective method for calculating the interfacial bond stress of concrete crankshaft type bridge strengthened by FRP, and provides theoretical guidance and reference significance for the future strengthening of crankshaft type bridge with FRP.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.72;U441

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