本文關(guān)鍵詞： 預(yù)應(yīng)力混凝土曲線梁橋 載荷試驗(yàn) 剪力滯效應(yīng) 扭轉(zhuǎn)變形 預(yù)應(yīng)力非對(duì)稱(chēng)設(shè)計(jì) 截面參數(shù)　出處：《安徽工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：預(yù)應(yīng)力混凝土曲線梁橋結(jié)構(gòu)以其特有的橋型和對(duì)地形的高度適應(yīng)性等優(yōu)點(diǎn)，在交通工程中得到廣泛使用。但由于對(duì)曲線梁橋計(jì)算理論和受力特點(diǎn)研究尚有不足，使其在施工過(guò)程和運(yùn)營(yíng)中易產(chǎn)生相關(guān)病害。論文以某預(yù)應(yīng)力混凝土曲線箱梁實(shí)橋?yàn)檠芯繉?duì)象，通過(guò)對(duì)實(shí)橋施工全過(guò)程參與，，并借助有限元分析軟件ANSYS平臺(tái)，綜合運(yùn)用試驗(yàn)、數(shù)值方法探討了預(yù)應(yīng)力混凝土曲線梁橋受力特點(diǎn)和扭轉(zhuǎn)變形效應(yīng)。主要研究?jī)?nèi)容有： 1、基于有限元分析軟件ANSYS平臺(tái)，采用空間實(shí)體單元和其它空間單元相互組合的有限法，建立了適用于預(yù)應(yīng)力混凝土曲線梁橋的數(shù)值建模理論。實(shí)橋箱梁預(yù)應(yīng)力張拉模擬與試驗(yàn)對(duì)比結(jié)果表明，論文建議的數(shù)值模型能很好地表現(xiàn)曲線梁橋的空間受力特性，具有一定的可靠性。 2、綜合應(yīng)用現(xiàn)場(chǎng)載荷試驗(yàn)和有限元模擬數(shù)值分析的研究手段，在充分考慮曲線梁橋彎扭耦合效應(yīng)影響的前提下，研究了成橋后主梁截面應(yīng)力、變形及其分布情況，探討了曲線梁橋箱梁截面剪力滯及曲率半徑對(duì)箱梁截面剪力滯分布的影響規(guī)律。結(jié)果表明，實(shí)橋試驗(yàn)數(shù)據(jù)均小于模擬計(jì)算值，且主梁應(yīng)力均在設(shè)計(jì)容許值范圍內(nèi)。 3、通過(guò)對(duì)曲線箱梁橋內(nèi)外側(cè)腹板預(yù)應(yīng)力鋼束張拉控制應(yīng)力和位置非對(duì)稱(chēng)設(shè)計(jì)情況的模擬分析，分析預(yù)應(yīng)力混凝土曲線箱梁橋在腹板預(yù)應(yīng)力鋼束非對(duì)稱(chēng)設(shè)計(jì)時(shí)梁體的扭轉(zhuǎn)變形效應(yīng)。結(jié)果表明：隨著外側(cè)腹板預(yù)應(yīng)力鋼束張拉控制應(yīng)力的增大或內(nèi)側(cè)腹板預(yù)應(yīng)力鋼束位置高度的減小，梁體的扭轉(zhuǎn)變形效應(yīng)明顯減小。 4、運(yùn)用數(shù)值方法探討了諸截面參數(shù)對(duì)曲線箱梁橋扭轉(zhuǎn)變形的影響規(guī)律，結(jié)果表明：隨著箱梁截面高度、底板寬度以及頂板厚度的增大，主梁的扭轉(zhuǎn)變形效應(yīng)減小，其中截面高度和底板寬度對(duì)其扭轉(zhuǎn)變形影響較大。且隨著曲率半徑的增大，主梁扭轉(zhuǎn)變形效應(yīng)逐漸減小。
[Abstract]:Prestressed concrete curved girder bridge structure is widely used in traffic engineering because of its unique bridge type and high adaptability to terrain. This paper takes a prestressed concrete curved box girder bridge as the research object, participates in the whole construction process of the bridge, and makes use of the finite element analysis software ANSYS platform. The stress characteristics and torsional deformation effect of prestressed concrete curved girder bridge are discussed by numerical method. The main contents are as follows:. 1. Based on the finite element analysis software ANSYS platform, the finite method of combining spatial entity element with other spatial element is adopted. The numerical modeling theory of prestressed concrete curved girder bridge is established. The results of simulation and test show that the numerical model proposed in this paper can well represent the spatial stress characteristics of curved girder bridge. It has certain reliability. 2. The stress, deformation and distribution of the main beam section after the completion of the bridge are studied on the premise of fully considering the influence of the coupling effect of bending and torsion on the curved girder bridge by the means of field load test and finite element simulation numerical analysis. The influence of shear lag and radius of curvature of box girder section on shear lag distribution of box girder section of curved girder bridge is discussed. The results show that the experimental data of real bridge are all less than those calculated by simulation, and the stress of main beam is within the range of design allowable value. 3, through the simulation analysis of the control stress and position asymmetry design of the prestressed steel strands of the inner and outer side web of the curved box girder bridge, The torsional deformation effect of prestressed concrete curved box girder bridge in asymmetric design of web prestressed steel girders is analyzed. The results show that with the increase of the tension control stress of the external web prestressed steel bundle or the prestress of the inner web plate, the torsional deformation effect of the prestressed concrete curved box girder bridge is analyzed. The reduction of the height of the steel bundle, The torsional deformation effect of beam is obviously reduced. 4. The influence of section parameters on torsional deformation of curved box girder bridge is discussed by numerical method. The results show that the torsional deformation effect of main girder decreases with the increase of box girder cross section height, floor width and roof thickness. The section height and the width of the bottom plate have great influence on the torsional deformation, and with the increase of the radius of curvature, the torsional deformation effect of the main beam decreases gradually.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441;U446

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