【摘要】：預(yù)應(yīng)力混凝土連續(xù)梁橋由于具有剛度大、變形小、橋面曲線平緩以及行車舒適等特點(diǎn)，是國內(nèi)外被廣泛采用的橋型之一，其主要施工方法為懸臂施工法。懸臂施工過程中為了達(dá)到預(yù)期的目標(biāo)包括結(jié)構(gòu)線形和內(nèi)力要求，進(jìn)行施工控制仿真計(jì)算分析，建立有限元模型，模擬計(jì)算分析每一施工階段結(jié)構(gòu)內(nèi)力和撓度變化，采取一定的施工控制措施，使成橋后結(jié)構(gòu)內(nèi)力和橋面線形滿足設(shè)計(jì)要求。 施工控制計(jì)算方法主要有：正裝計(jì)算法倒裝計(jì)算法無應(yīng)力狀態(tài)法。由于實(shí)際橋梁施工過程中各種荷載及不確定因素的影響，與理想的橋梁施工狀況存在著較大的誤差，一般采用最小二乘法和卡爾曼濾波法進(jìn)行施工控制誤差調(diào)整。 本文的研究對(duì)象是跨徑為60+105+60m的預(yù)應(yīng)力混凝土連續(xù)梁，運(yùn)用有限元程序?qū)κ┕み^程進(jìn)行仿真計(jì)算分析，，并且提取了最大懸臂段邊跨合攏階段中跨合攏階段成橋階段運(yùn)營階段等關(guān)鍵施工階段的內(nèi)力圖，而且分析了在這些關(guān)鍵施工階段截面彎矩和應(yīng)力變化情況。由監(jiān)控實(shí)測(cè)施工階段標(biāo)高與應(yīng)變與理論計(jì)算值比較來，檢驗(yàn)施工控制效果。 連續(xù)梁的零號(hào)塊是一個(gè)復(fù)雜的受力結(jié)構(gòu)，是主要的承重部分，尤其是在最大懸臂階段要承受巨大的荷載作用。運(yùn)用桿系模型不能準(zhǔn)確真實(shí)反映局部應(yīng)力分布情況，因此采用FEA軟件建立零號(hào)塊模型進(jìn)行局部應(yīng)力分析，分別對(duì)零號(hào)塊頂板底板腹板橫隔板的縱向橫向及主應(yīng)力分布狀況進(jìn)行計(jì)算分析，分析零號(hào)塊局部應(yīng)力對(duì)于解決零號(hào)塊裂縫較多這一問題，具有重要意義和指導(dǎo)作用。
[Abstract]:Prestressed concrete continuous beam bridge is one of the most widely used bridges at home and abroad because of its large stiffness, small deformation, smooth curve of deck and comfortable driving. The main construction method is cantilever construction method. In order to achieve the expected objectives, including the structure alignment and internal force requirements, the construction control simulation calculation and analysis are carried out, the finite element model is established, and the structural internal force and deflection changes in each construction stage are simulated and analyzed. Certain construction control measures are adopted to make the internal force of the structure and the line shape of the bridge deck meet the design requirements after the completion of the bridge. Construction control calculation methods are mainly: the formal calculation method? Reverse calculation? Stress free state method. Due to the influence of various loads and uncertain factors in the actual bridge construction, there is a large error with the ideal bridge construction condition. The least square method and Kalman filter method are generally used to adjust the construction control error. The research object of this paper is the prestressed concrete continuous beam whose span is 6010560m. The finite element program is used to simulate and analyze the construction process, and the maximum cantilever section is extracted. Side span closing phase? Middle span closing stage? The bridge stage? The internal force diagrams of key construction stages such as operation stage are analyzed and the variation of cross-section bending moment and stress in these key construction stages are analyzed. The effect of construction control is tested by comparing the measured elevation and strain with the calculated values. The zero block of continuous beam is a complex structure, which is the main load-bearing part, especially in the maximum cantilever stage. The use of the bar system model can not accurately reflect the local stress distribution, so the FEA software is used to establish the zero block model for local stress analysis, respectively for the zero block roof? Floor? Web? Transverse diaphragm longitudinal? The distribution of transverse and principal stresses is calculated and analyzed. It is of great significance and guidance to analyze the local stress of block zero in order to solve the problem that there are more cracks in block zero.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445;U448.215

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本文編號(hào)：2408128