【摘要】：連續(xù)剛構(gòu)橋以強度高、線形明快、施工簡便快捷、跨越能力強的優(yōu)勢在大跨度橋梁中具有廣泛的應(yīng)用。 連續(xù)剛構(gòu)橋常常采用對稱懸臂澆筑法施工。在懸臂施工過程中，橋梁結(jié)構(gòu)受多種因素的影響，如混凝土的收縮和徐變、設(shè)計參數(shù)與實際數(shù)值的差異、施工誤差、測量誤差、溫度變化等，因此采用懸臂澆筑法施工必然給橋梁結(jié)構(gòu)帶來非常復(fù)雜的內(nèi)力和位移變化。為了保證橋梁施工質(zhì)量和橋梁建設(shè)安全，確保連續(xù)梁橋成橋后的主梁線形和結(jié)構(gòu)內(nèi)力符合設(shè)計要求，使連續(xù)剛構(gòu)橋的實際狀態(tài)與設(shè)計狀態(tài)盡可能相符，橋梁施工控制是不可缺少的。 本文在分析總結(jié)國內(nèi)外大跨度預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋發(fā)展和施工控制技術(shù)的基礎(chǔ)上，對連續(xù)剛構(gòu)橋施工控制的特點以及方法進行概括介紹。以大渡河大山水電站省道S211及庫周交通復(fù)建工程什月河大橋為工程背景，闡述了灰色系統(tǒng)理論，建立預(yù)測模型GM(1,1),將什月河大橋?qū)嶋H工程看成一個灰色系統(tǒng)，以什月河大橋5號墩中跨的9號塊箱梁的預(yù)測計算為實例，運用GM(1,1)模型對9號塊撓度變化值進行預(yù)測計算，，得出下一階段立模板時的預(yù)留拱度。 本文結(jié)合什月河大橋?qū)嶋H工程，運用MIDAS/CIVIL模型軟件對參數(shù)進行分析計算，得到混凝土的彈性模量與容重的變化對該橋的標(biāo)高影響最為顯著，在彈性模量和容重分析參數(shù)減小10%的條件下，引起橋梁撓度值變化范圍達到15%左右。采用大型計算軟件MIDAS/CIVIL對全橋逐段懸臂施工進行仿真分析模擬，對施工各個階段進行調(diào)整控制。在線形控制中，通過對模型分析計算，得到了施工預(yù)拱度與成橋預(yù)拱度值，提出了立模標(biāo)高的計算公式，從合攏結(jié)果來看達到了設(shè)計的線形，說明了計算結(jié)果的正確性。在應(yīng)力控制中，由模型計算得到了施工各階段的箱梁理論應(yīng)力值，經(jīng)過比較分析，實測應(yīng)力值與理論應(yīng)力值基本吻合，達到了對該橋應(yīng)力控制的目的。 根據(jù)實際工程經(jīng)驗得出一些關(guān)于連續(xù)剛構(gòu)橋有益的結(jié)論和經(jīng)驗，為以后相同類型的橋梁施工控制具有一定的借鑒作用。
[Abstract]:Continuous rigid frame bridge has been widely used in long span bridges because of its advantages of high strength, quick alignment, simple construction and strong span ability. Continuous rigid frame bridges are often constructed by means of symmetrical cantilever casting. In the course of cantilever construction, bridge structure is affected by many factors, such as shrinkage and creep of concrete, difference between design parameters and actual values, construction error, measurement error, temperature change and so on. Therefore, the cantilever casting method will inevitably bring complex internal force and displacement change to the bridge structure. In order to ensure the quality of bridge construction and the safety of bridge construction, the alignment and internal force of the main beam after the continuous beam bridge is completed meet the design requirements, and the actual state of the continuous rigid frame bridge accords with the design state as much as possible. Bridge construction control is indispensable. On the basis of analyzing and summarizing the development and construction control technology of long span prestressed concrete continuous rigid frame bridge at home and abroad, this paper briefly introduces the characteristics and methods of construction control of continuous rigid frame bridge. Taking the Dadu River Dashan Hydropower Station provincial road S211 and Shiyuehe Bridge as the engineering background, this paper expounds the grey system theory, establishes the forecasting model GM (1,1), and regards the actual project of Shiyuehe Bridge as a grey system. Taking the prediction calculation of 9 box girder in the middle span of No. 5 pier of Shiyuehe Bridge as an example, the GM (1,1) model is used to predict the deflection value of Block 9, and the reserved camber of the formwork is obtained in the next stage. In this paper, according to the actual project of Shiyuehe Bridge, the parameters of the bridge are analyzed and calculated by using MIDAS/CIVIL model software. The results show that the change of elastic modulus and bulk density of concrete has the most significant influence on the elevation of the bridge. When the analytical parameters of elastic modulus and bulk density are reduced by 10%, the variation range of bridge deflection is about 15%. The large-scale calculation software MIDAS/CIVIL is used to simulate the cantilever construction of the whole bridge segment by section and adjust and control each stage of the construction. In the linear control, the pre-arch degree of construction and the pre-arch value of the bridge are obtained by analyzing and calculating the model, and the formula for calculating the standard height of vertical formwork is put forward. The alignment of the design is achieved from the closing result, and the correctness of the calculation result is explained. In the process of stress control, the theoretical stress values of box beams in each stage of construction are obtained by model calculation. Through comparison and analysis, the measured stress values are basically consistent with the theoretical stress values, and the purpose of stress control of the bridge is achieved. Based on the practical engineering experience, some useful conclusions and experiences about the continuous rigid frame bridge are drawn, which can be used for reference for the construction control of the same type of bridge in the future.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4

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