本文選題：鋼筋混凝土拱橋 + 收縮徐變�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：國(guó)內(nèi)大多采用無支架纜索吊裝法或勁性骨架法建造大跨度鋼筋混凝土拱橋,纜索吊裝法雖然降低了節(jié)段吊裝重量,但存在接頭數(shù)量多、整體性差的問題;勁性骨架法存在用鋼量大、施工時(shí)間長(zhǎng)、后期徐變收縮大的問題。國(guó)外自上世紀(jì)60年代起,普遍采用懸臂澆筑法或懸臂澆筑與勁性骨架組合法施工混凝土拱橋,拱圈整體性好、外形美觀。采用組合法施工的鋼筋混凝土拱橋,拱腳區(qū)段采用懸臂澆筑法、拱頂段先用勁性骨架合龍,再圍繞勁性骨架外包混凝土,最終形成鋼筋混凝土拱�；炷潦湛s徐變對(duì)以受壓為主的鋼筋混凝土拱圈的變形和受力有較大影響,迄今為止國(guó)內(nèi)尚未針對(duì)采用懸臂澆筑與勁性骨架組合施工的鋼筋混凝土拱橋收縮徐變效應(yīng)影響開展過理論研究。本文依托貴州省交通運(yùn)輸廳科技項(xiàng)目“懸臂澆筑與勁性骨架組合施工大跨度混凝土拱橋技術(shù)關(guān)鍵與示范”,以跨徑210m的貴州省夜郎湖大橋?yàn)檠芯繉?duì)象,采用數(shù)值分析方法,研究收縮徐變對(duì)采用懸臂澆筑與勁性骨架組合施工的鋼筋混凝土拱橋主拱圈受力及線形影響:①收集國(guó)內(nèi)外混凝土收縮徐變研究資料,對(duì)具有代表性收縮徐變預(yù)測(cè)模型、徐變計(jì)算理論和各種預(yù)測(cè)模型進(jìn)行對(duì)比分析�？偨Y(jié)目前常用的收縮徐變有限元計(jì)算分析方法。②運(yùn)用MIDAS/CIVIL有限元軟件,采用D62-2004模型、GL2000模型、NCHRP496模型,開展夜郎湖大橋主拱圈收縮徐變效應(yīng)分析,對(duì)比三種模型計(jì)算所得出的施工過程及成橋后主拱圈的變形和應(yīng)力重分布規(guī)律。探討懸臂澆筑段與勁性骨架不同長(zhǎng)度組合下收縮徐變對(duì)主拱圈受力及變形影響。③通過D62-2004、GL2000、NCHRP496這三種模型對(duì)收縮徐變效應(yīng)的理論分析研究,給出了三種模型下夜郎湖大橋主拱圈的預(yù)拱度值,分析表明,按拱腳推力影響線分配預(yù)拱度與擬合的預(yù)拱度函數(shù)分配方式較為接近。
[Abstract]:In our country, the cable hoisting method or the rigid skeleton method are mostly used to construct the long-span reinforced concrete arch bridge. Although the cable hoisting method reduces the lifting weight of the segment, there are many joints and poor integrity. The stiffness skeleton method has the problems of large amount of steel, long construction time and large creep and shrinkage. Since 1960s, cantilever pouring method or cantilever pouring combined with rigid skeleton method have been widely used in foreign countries to construct concrete arch bridge. The arch ring has good integrity and beautiful appearance. The reinforced concrete arch bridge constructed by combination method is constructed with cantilever pouring method in the arch foot section. The arch section is first closed with a rigid skeleton and then wrapped around the rigid skeleton to form a reinforced concrete arch. The shrinkage and creep of concrete have great influence on the deformation and force of reinforced concrete arch ring which is mainly under compression. Up to now, no theoretical research has been carried out on the effect of shrinkage and creep of reinforced concrete arch bridge constructed by cantilever pouring and rigid skeleton. Based on the scientific and technological project of Guizhou Provincial Communications and Transportation Department, "the key and demonstration of cantilever construction and rigid skeleton combination construction of long-span concrete arch bridge", this paper takes the Yilang Lake Bridge of Guizhou Province with a span of 210 m as the research object, and adopts the numerical analysis method. This paper studies the influence of shrinkage and creep on the main arch ring force and linear shape of reinforced concrete arch bridge constructed by cantilever pouring and rigid skeleton combination. The research data of shrinkage and creep at home and abroad are collected, and the representative shrinkage and creep prediction model is given. The creep calculation theory and various prediction models are compared and analyzed. This paper summarizes the commonly used finite element analysis method of shrinkage and creep by using MIDAS/CIVIL finite element software and using D62-2004 model GL2000 model and NCHRP496 model to analyze the shrinkage and creep effect of the main arch ring of Yilang Lake Bridge. The construction process of the three models and the distribution of deformation and stress of the main arch ring after completion of the bridge are compared. The effects of shrinkage and creep on the stress and deformation of the main arch ring under the combination of cantilever casting section and stiffened skeleton are discussed. 3 the effects of shrinkage and creep on the shrinkage and creep of the main arch ring are studied theoretically by using the three models of D62-2004 and GL2000and NCHRP496. In this paper, the pre-arch values of main arch ring of Yaolang Lake Bridge under three kinds of models are given. The analysis shows that the distribution of pre-arch degree according to the influence line of arch foot thrust is close to the distribution mode of fitting pre-arch function.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.22

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本文編號(hào)：1847925