本文選題：臨時固結(jié) + 簡化模式��； 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：在PC連續(xù)梁橋的施工過程中,往往需要通過施工控制以保證主梁的成橋線形。本文以三跨連續(xù)梁為工程背景,利用Midas/civil建立橋梁結(jié)構(gòu)的計算模型,針對懸臂施工控制中墩梁臨時固結(jié)的相關(guān)問題、合龍附加壓重的計算及其對成橋后結(jié)構(gòu)線形的影響作了相應(yīng)的分析和探索。主要完成以下工作并得出相關(guān)結(jié)論:(1)在查閱相關(guān)資料的基礎(chǔ)上,了解預(yù)應(yīng)力混凝土連續(xù)梁橋的發(fā)展歷程和懸臂施工的特點,并對懸臂施工中臨時固結(jié)、壓重的確定及實施措施進行了探討。(2)針對臨時固結(jié)受力分析中計算模型存在的問題,通過對桿系模型中臨時固結(jié)模擬方法的研究,探索其在不同施工階段對結(jié)構(gòu)狀態(tài)的影響。(3)在計算分析臨時固結(jié)彈性支撐剛度的基礎(chǔ)上,以主梁轉(zhuǎn)角剛度為主要參數(shù),探討臨時固結(jié)剛度、橋墩剛度對體系轉(zhuǎn)換過程中主梁變形的影響,結(jié)果表明:臨時固結(jié)是一種彈性連接,鉸接和固結(jié)是它的兩種極限狀態(tài);當(dāng)墩梁轉(zhuǎn)角剛度比值很大時,施工控制計算中可以不計入橋墩的影響。(4)在對強制合龍工程措施作用效果分析的基礎(chǔ)上,針對施工中合龍段兩端出現(xiàn)相對高差的現(xiàn)象,按照兩種合龍順序分別推導(dǎo)相應(yīng)的附加壓重計算公式以及對應(yīng)的強制合龍成橋后主梁變形方程,并結(jié)合工程實例對其進行有限元分析予以驗證。施工合龍時所需的附加壓重與誤差成正比,誤差越大對于成橋后主梁的線形影響越大。(5)通過建立強制合龍的數(shù)值分析模型,探討合龍誤差對成橋階段、橋面鋪裝階段以及三年徐變后等工況的結(jié)構(gòu)線形影響。成橋后主梁對稱截面上的位移變化趨勢一致,且隨時間增大;合龍誤差對成橋階段的梁體線形影響較大,而在橋面鋪裝完成后,其影響程度減小,經(jīng)過三年收縮徐變后,梁體線形變化趨于穩(wěn)定,而且由合龍誤差引起的主梁位移值,不會因混凝土的徐變作用而緩解或消除;通過對先邊后中和先中后邊兩種合龍順序的對比分析,發(fā)現(xiàn)前者強制合龍成橋后梁體線形所受影響為主跨大于邊跨,而后者為邊跨大于主跨。
[Abstract]:In the construction process of PC continuous beam bridge, it is often necessary to ensure the bridge alignment through construction control. In this paper, taking three-span continuous beam as the engineering background, using Midas / civil to establish the calculation model of bridge structure, aiming at the problems related to temporary consolidation of pier beam in cantilever construction control. The calculation of additional pressure weight and its influence on the structure alignment after completion of the bridge are analyzed and explored. The main work and relevant conclusions are as follows: (1) on the basis of consulting relevant data, understand the development of prestressed concrete continuous beam bridge and the characteristics of cantilever construction, and the temporary consolidation of cantilever construction, The determination of compression weight and the practical measures are discussed. (2) in view of the problems existing in the calculation model of temporary consolidation force analysis, the method of temporary consolidation simulation in the bar system model is studied. On the basis of the calculation and analysis of the stiffness of the temporary consolidation elastic support, the angle stiffness of the main beam is taken as the main parameter, and the temporary consolidation stiffness is discussed. The effect of pier stiffness on the deformation of the main beam in the course of system transformation is shown. The results show that the temporary consolidation is an elastic connection, and the hinge and consolidation are its two limiting states, and when the ratio of stiffness to rotation angle of the pier beam is high, The influence of bridge piers can not be taken into account in the calculation of construction control. (4) based on the analysis of the effect of forced closure engineering measures, the phenomenon of relative height difference between the two ends of the closure section in construction is pointed out. According to the two kinds of closure sequence, the corresponding formulas of additional pressure and weight and the corresponding deformation equation of the main girder after the forced closure of the bridge are derived respectively, and the finite element analysis is carried out to verify the equation in combination with the engineering examples. The additional pressure is proportional to the error, and the greater the error is, the greater the influence of the error on the alignment of the main girder after completion. (5) by establishing the numerical analysis model of forced closure, the stage of bridge completion is discussed. The influence of bridge deck paving stage and three years creep on the structure alignment. After completion of the bridge, the variation trend of the displacement on the symmetrical section of the main beam is consistent and increases with time, and the closure error has a great influence on the beam alignment in the completion stage, but after the completion of the deck pavement, the influence degree decreases, and after three years of shrinkage and creep, The linear variation of beam body tends to be stable, and the displacement value of the main beam caused by the closing error will not be alleviated or eliminated by the creep of concrete. Through the comparative analysis of the sequence of the first edge and the first side and the middle side and the second side, the displacement value of the main beam will not be alleviated or eliminated by the creep action of concrete. It is found that the main span is greater than the side span, while the latter is the edge span larger than the main span.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4

【參考文獻】

相關(guān)期刊論文 前1條

1 韋初寬;彭蓉;;預(yù)應(yīng)力混凝土連續(xù)梁橋線形控制影響因素研究[J];西部交通科技;2012年07期

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本文編號：2087727