【摘要】：隨著橋梁建設(shè)的發(fā)展和預(yù)應(yīng)力技術(shù)的提高,預(yù)應(yīng)力混凝土連續(xù)梁橋作為一種大跨度橋型,得到越來越多的應(yīng)用。為保證連續(xù)梁橋的成橋線形與設(shè)計(jì)線形很好的吻合,以及結(jié)構(gòu)在施工過程的安全和穩(wěn)定,施工監(jiān)控受到越來越多的重視。本文以隴海路北輔道橋?yàn)楣こ瘫尘?對大跨度預(yù)應(yīng)力混凝土連續(xù)梁橋施工監(jiān)控進(jìn)行研究,主要研究內(nèi)容及結(jié)論如下： (1)基于有限元原理及隴海路北輔道橋施工特點(diǎn),利用Midas/Civil軟件建立有限元模型,對該橋進(jìn)行施工過程模擬分析,得出橋梁控制截面的應(yīng)力狀態(tài)； (2)通過建立的有限元計(jì)算模型,對北輔道橋設(shè)計(jì)參數(shù)進(jìn)行敏感性分析。由敏感性的分析結(jié)果可知：混凝土容重、預(yù)應(yīng)力誤差、收縮徐變對主梁的撓度和應(yīng)力的影響很大；墩身基礎(chǔ)不均勻沉降對主梁撓度的影響很大；混凝土彈性模量對主梁的撓度和應(yīng)力影響較��； (3)結(jié)合本工程受力特征及施工進(jìn)度,編制施工監(jiān)控方案,對大橋的施工全程進(jìn)行線形監(jiān)控和應(yīng)力監(jiān)控。通過有效的施工監(jiān)控,北輔道橋各應(yīng)力監(jiān)測斷面實(shí)際應(yīng)力狀態(tài)隨施工進(jìn)程發(fā)展?fàn)顩r符合預(yù)期設(shè)計(jì)目標(biāo),線形符合設(shè)計(jì)要求； (4)在應(yīng)力監(jiān)測中,對實(shí)測應(yīng)力計(jì)算方法進(jìn)行了研究。本文實(shí)測應(yīng)力計(jì)算考慮階段施工中收縮、徐變的影響,并用Matlab進(jìn)行編程計(jì)算。通過比較分析,考慮混凝土收縮、徐變所得的實(shí)測應(yīng)力與計(jì)算值差別較小,按此方法由實(shí)測應(yīng)變得到橋梁的真實(shí)應(yīng)力狀態(tài)是可行的； (5)以隴海路北輔道橋?yàn)楣こ瘫尘?測試了梁體的溫度場。以溫度場測試結(jié)果為依據(jù),分析了晴天和陰天箱梁的溫度場隨時(shí)間變化的規(guī)律,得出箱梁截面的溫度場分布形式并通過曲線擬合獲得箱梁最大溫差分布函數(shù)。在最大懸臂狀態(tài)下,借助有限元軟件Midas/Civil對橋梁結(jié)構(gòu)溫度梯度的作用效應(yīng)進(jìn)行了分析,結(jié)果表明溫度梯度對結(jié)構(gòu)變形的影響比較大。
文內(nèi)圖片：
圖片說明：全橋合龍底板應(yīng)力分布(MPa
[Abstract]:With the development of bridge construction and the improvement of prestress technology, prestressed concrete continuous beam bridge, as a kind of long-span bridge type, has been more and more used. In order to ensure that the bridge alignment of continuous beam bridge is in good agreement with the design alignment, as well as the safety and stability of the structure in the construction process, more and more attention has been paid to construction monitoring. In this paper, based on the engineering background of Longhai Road North Auxiliary Road Bridge, the construction monitoring of long-span prestressed concrete continuous beam bridge is studied. the main research contents and conclusions are as follows: (1) based on the finite element principle and the construction characteristics of Longhai Road North Auxiliary Road Bridge, the finite element model is established by using Midas/Civil software, and the stress state of the bridge control section is obtained by simulating and analyzing the construction process of the bridge. (2) through the finite element calculation model, the sensitivity analysis of the design parameters of Beifu Road Bridge is carried out. The results of sensitivity analysis show that the bulk density of concrete, prestress error, shrinkage and creep have great influence on the deflection and stress of the main beam, the uneven settlement of the pier foundation has a great influence on the deflection of the main beam, and the elastic modulus of concrete has little effect on the deflection and stress of the main beam. (3) according to the stress characteristics and construction progress of the project, the construction monitoring scheme is worked out, and the linear monitoring and stress monitoring are carried out in the whole construction process of the bridge. Through effective construction monitoring, the actual stress state of each stress monitoring section of Beifu Road Bridge accords with the expected design goal and the alignment meets the design requirements with the development of the construction process. (4) in the stress monitoring, the calculation method of the measured stress is studied. In this paper, the measured stress calculation takes into account the influence of shrinkage and creep in construction, and the programming calculation is carried out with Matlab. Through comparative analysis, considering the shrinkage of concrete, the difference between the measured stress and the calculated value is small, and it is feasible to obtain the real stress state of the bridge from the measured strain according to this method. (5) taking the north auxiliary road bridge of Longhai Road as the engineering background, the temperature field of the beam body is tested. Based on the test results of temperature field, the variation of temperature field of box girder in sunny and cloudy days with time is analyzed, and the temperature field distribution form of box girder section is obtained, and the maximum temperature difference distribution function of box girder is obtained by curve fitting. Under the condition of maximum cantilever, the effect of temperature gradient on the temperature gradient of bridge structure is analyzed by means of finite element software Midas/Civil. The results show that the temperature gradient has a great influence on the deformation of the structure.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 顧安邦,常英,樂云祥;大跨徑預(yù)應(yīng)力連續(xù)剛構(gòu)橋施工控制的理論與方法[J];重慶交通學(xué)院學(xué)報(bào);1999年04期

2 黎雙邵;張勇;黃沛;;監(jiān)測與監(jiān)控技術(shù)在橋梁施工中的作用[J];中國港灣建設(shè);2008年02期

3 方華兵;田啟賢;;大跨度預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋主梁線形控制參數(shù)敏感性分析[J];橋梁建設(shè);2006年02期

4 周南;;塌橋之痛——近年中國橋梁垮塌事故之TOP8[J];中國市場;2007年33期

5 徐洪濤;郭國忠;蒲煥玲;苑敏;;我國近年來橋梁事故發(fā)生的原因與教訓(xùn)[J];中國安全科學(xué)學(xué)報(bào);2007年11期

6 李立峰,邵旭東,程翔云;混凝土箱形梁橋的溫度梯度研究[J];中南公路工程;2001年04期

，

本文編號：2511460