發(fā)布時間：2018-05-14 02:20

  本文選題：簡支變連續(xù) + T梁橋��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：本文通過總結(jié)國內(nèi)外關(guān)于混凝土橋梁的裂縫研究概況，發(fā)現(xiàn)預(yù)應(yīng)力混凝土橋梁裂縫研究多集中于懸臂現(xiàn)澆法、滿堂支架現(xiàn)澆法等一些現(xiàn)場制作構(gòu)件的橋梁，而對于公路橋梁中占據(jù)大部分?jǐn)?shù)量的裝配式預(yù)應(yīng)力混凝土橋梁研究較少。經(jīng)過對福建省混凝土橋梁裂縫病害的調(diào)研發(fā)現(xiàn)，裝配式預(yù)應(yīng)力混凝土橋梁在服役若干年后出現(xiàn)了不少裂縫病害，，嚴(yán)重降低了橋梁的耐久性及使用性能。 以福建省某簡支變連續(xù)T梁橋為依托工程，將橋面翼緣板為研究對象，概括了工程界常用的分析研究混凝土開裂的數(shù)學(xué)模型和開裂判斷準(zhǔn)則，其中包括空間應(yīng)力狀態(tài)的描述和強度理論，歸納了T梁橋翼緣板上裂縫病害的形式并分析了可能的原因。選擇預(yù)應(yīng)力損失和翼緣板厚度兩個方面，建立ANSYS有限元模型，分析其對翼緣板應(yīng)力狀態(tài)的影響規(guī)律。研究結(jié)果表明：預(yù)應(yīng)力分別損失對翼緣板頂面中心處、翼緣板加腋與腹板交接處應(yīng)力增加貢獻(xiàn)最大；隨著預(yù)應(yīng)力損失的增大，翼緣板加腋與腹板交接處應(yīng)力增加的速率變大；隨著翼緣板厚度變化，翼緣板頂面中心處、翼緣板加腋與腹板交接處應(yīng)力變化幅度較大，其他點處應(yīng)力變化非常��；翼緣板厚度為16cm時邊跨、中跨的跨中截面翼緣板頂面中心處應(yīng)力出現(xiàn)峰值，較其他工況大很多；隨著翼緣板加厚，邊跨支點截面頂面中心處、翼緣板加腋與腹板交接處應(yīng)力變化曲線斜率由大變小。最后本文從施工和運營兩方面，對T梁翼緣板混凝土提開裂控制措施，并介紹了混凝土裂縫修補方法。
[Abstract]:This paper summarizes the research situation of cracks in concrete bridges at home and abroad, and finds out that the research on cracks of prestressed concrete bridges is mainly focused on cantilever cast-in-place method, cast-in-situ method of full support, and so on. However, there is little research on the prestressing concrete bridge which accounts for most of the highway bridges. Through the investigation and investigation of cracks in concrete bridges in Fujian Province, it is found that there are many cracks in prestressing concrete bridges in service for several years, which seriously reduces the durability and performance of the bridges. Based on a simply supported and continuous T-beam bridge in Fujian Province, the flange slab of bridge deck is taken as the research object, and the mathematical model and criterion of cracking analysis and research in engineering field are summarized. Including the description of spatial stress state and strength theory, the form of crack on flange plate of T-beam bridge is summarized and the possible causes are analyzed. The ANSYS finite element model is established to analyze the influence of prestressing loss and flange plate thickness on the stress state of flange plate. The results show that the stress increase at the junction of flange plate and axillary plate is the greatest contribution to the stress increase of the flange plate at the center of the top surface of the flange plate, and with the increase of the prestress loss, the rate of stress increase at the junction between the flange plate and the axillary plate and the web plate increases with the increase of the prestress loss. With the change of flange plate thickness, the stress changes at the center of the flange plate top surface, the flange plate plus axillary and web interface are larger, and the stress changes at other points are very small, and the flange plate thickness is 16cm when the edge span, the thickness of the flange plate is the same as that of the flange plate. The stress at the center of the top surface of the mid-span flange plate has a peak value, which is much larger than that of other conditions, and with the flange plate thickening, the slope of the stress curve changes from large to small at the center of the top plane of the side span fulcrum section and the junction between the flange plate and the web plate. Finally, the paper introduces the crack control measures of T-beam flange slab concrete from two aspects of construction and operation, and introduces the concrete crack repair method.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.6

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本文編號：1885891