本文選題：先簡支后連續(xù)T梁橋 + 有限元　； 參考：《南昌大學(xué)》2014年碩士論文

【摘要】：預(yù)應(yīng)力混凝土T型連續(xù)梁橋具有變形小、剛度大、伸縮縫數(shù)量少等優(yōu)點(diǎn)，而且行車舒適，施工及養(yǎng)護(hù)方便，往往在各類橋梁的比選中受到業(yè)主們的青睞。 在連續(xù)T型梁橋的幾種施工方法中，，先簡支后連續(xù)施工方法是一種經(jīng)濟(jì)有效的施工方法，與普通混凝土連續(xù)梁橋相比，此種方法造價(jià)低廉，施工便捷，周期較短，受到了設(shè)計(jì)者和施工者們的歡迎。 但我國先簡支后連續(xù)梁橋還處在發(fā)展階段，施工技術(shù)和設(shè)備相對(duì)落后，在建設(shè)施工和使用過程中產(chǎn)生了諸多問題和病害，造成了大量經(jīng)濟(jì)損失，故對(duì)這些病害加以分析研究很有必要。 本文通過利用大型有限元軟件Midas/Civil，以典型預(yù)應(yīng)力T梁橋作為研究對(duì)象，對(duì)其上部結(jié)構(gòu)進(jìn)行整體仿真計(jì)算與分析研究。 分析支座病害發(fā)現(xiàn)，支座脫空和支座異常變形對(duì)結(jié)構(gòu)受力影響均較大，邊梁支座脫空比中梁支座脫空更不利。 分析了不同預(yù)應(yīng)力損失量下的負(fù)彎矩鋼束張拉對(duì)結(jié)構(gòu)受力的影響，其中主要的影響主要在支座附近的截面。除了對(duì)負(fù)彎矩所在的主梁受力產(chǎn)生明顯影響，還對(duì)其相鄰的主梁造成了影響，但其他相隔的主梁無明顯變化。 分析施工順序表明，同一墩頂處各片主梁負(fù)彎矩張拉施工次序中，優(yōu)先選擇對(duì)稱張拉各片主梁負(fù)彎矩鋼束；縱橋向施工順序中，先澆筑所有主梁間濕接縫，然后對(duì)稱澆筑或者間隔澆筑濕接頭，并張拉負(fù)彎矩鋼束。 最后采用大型有限元軟件ANSYS對(duì)后連續(xù)段濕接頭部分進(jìn)行局部分析，對(duì)其成橋階段分析表明，濕接頭中間部分和底緣部分容易受到較大的拉應(yīng)力，此處應(yīng)該提高配筋率、采用高強(qiáng)度混凝土等方法來加強(qiáng)結(jié)構(gòu)剛度，并減少預(yù)應(yīng)力損失。
[Abstract]:Prestressed concrete T-type continuous beam bridge has the advantages of small deformation, large stiffness, small number of expansion joints and so on. It is also comfortable in driving, convenient in construction and maintenance, and often favored by the owners in the comparison and selection of various kinds of bridges. Among several construction methods of continuous T-beam bridge, the method of simple support and then continuous construction is an economical and effective construction method. Compared with ordinary concrete continuous beam bridge, this method is cheap, easy to construct and has a shorter period. It was welcomed by designers and builders. However, the construction technology and equipment are relatively backward, which has caused many problems and diseases in the process of construction and use, resulting in a large number of economic losses. Therefore, it is necessary to analyze and study these diseases. By using the large-scale finite element software Midas / Civil, this paper takes the typical prestressed T-beam bridge as the research object, carries on the overall simulation calculation and the analysis to its superstructure. Based on the analysis of the bearing diseases, it is found that the bearing void and the abnormal deformation of the support have great influence on the stress of the structure, and the side beam support is more disadvantageous than the middle beam support. In this paper, the influence of negative moment steel bundle tension on the stress of the structure under different prestressing loss is analyzed, in which the main influence is on the section near the bearing. In addition to the negative bending moment of the main beam force has a significant impact on its adjacent main beam, but the other separated main beam has no obvious change. The analysis of the construction sequence shows that in the construction sequence of negative moment tension of each piece of main beam at the same pier top, priority is given to symmetrical tensioning each piece of negative moment steel beam, and in the construction sequence of longitudinal bridge, the wet joints between all main beams are first cast. The wet joints are then poured symmetrically or at intervals, and the negative moment steel bundles are tensioned. Finally, the local analysis of the wet joint part of the back continuous segment is carried out by using the large-scale finite element software ANSYS. The analysis of the bridge stage shows that the middle part and the bottom edge part of the wet joint are vulnerable to large tensile stress, and the reinforcement ratio should be increased here. High-strength concrete is used to strengthen the stiffness of the structure and reduce the loss of prestress.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441

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本文編號(hào)：2075199