本文選題：預(yù)應(yīng)力混凝土連續(xù)梁橋 + 徐變　； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：預(yù)應(yīng)力混凝土連續(xù)梁橋是當(dāng)今橋梁中應(yīng)用最為廣泛的橋型之一,其適應(yīng)跨徑可以從10-40m的中小跨徑直到200-300m的超大跨徑。目前連續(xù)梁橋的施工方法主要有滿堂支架現(xiàn)澆法、簡支變連續(xù)施工法、懸臂施工法以及頂推施工法等。已有研究表明,不同的施工方法建造的連續(xù)梁橋成橋后的恒載內(nèi)力不同。其中滿堂支架現(xiàn)澆法和頂推施工法建造的連續(xù)梁橋恒載內(nèi)力與一次成形結(jié)構(gòu)的內(nèi)力相同,而簡支變連續(xù)施工法建造的連續(xù)梁橋恒載內(nèi)力與簡支梁橋結(jié)構(gòu)內(nèi)力分布相似,懸臂施工法建造的連續(xù)梁橋恒載內(nèi)力與懸臂梁的恒載內(nèi)力分布相近。由于不同施工方法在混凝土連續(xù)梁中產(chǎn)生不同的內(nèi)力狀態(tài),進(jìn)而影響到徐變的發(fā)展,對于這一問題的研究尚不充分,從而導(dǎo)致在混凝土連續(xù)梁的長期性能分析缺乏必要的認(rèn)識,影響既有橋梁評估的正確性。因此,本文將對不同施工方法建造的預(yù)應(yīng)力混凝土連續(xù)梁橋的徐變效應(yīng)進(jìn)行研究,探討其基本規(guī)律。全文主要的研究內(nèi)容如下:采用有限元法,分別對滿堂支架施工法、簡支變連續(xù)施工法和懸臂澆筑法建造的連續(xù)梁橋成橋后恒載內(nèi)力的分布以及演變趨勢進(jìn)行分析,包括考慮結(jié)構(gòu)布置有預(yù)應(yīng)力鋼束和不考慮預(yù)應(yīng)力鋼束兩種情況,并進(jìn)行對比。分析混凝土徐變對這三種施工方法建造的連續(xù)梁橋恒載內(nèi)力的長期影響,并選取了主梁典型截面進(jìn)行具體分析。在簡支變連續(xù)施工法建造的連續(xù)梁恒載內(nèi)力演變分析中除了采用有限元法,還采用了狄辛格法理論計算主梁典型截面的恒載內(nèi)力,并與有限元法得出的結(jié)論進(jìn)行比較,結(jié)果表明這兩種方法得出的結(jié)論是一致的。對于懸臂澆筑法建造的連續(xù)梁橋,運(yùn)用無應(yīng)力狀態(tài)法分析施工過程對結(jié)構(gòu)內(nèi)力的影響;在進(jìn)行全橋內(nèi)力演變分析前,將實(shí)測的應(yīng)變值與有限元法的計算值進(jìn)行對比,驗(yàn)證了模型的可靠性。研究表明,布置有預(yù)應(yīng)力鋼束的連續(xù)梁,結(jié)構(gòu)的恒載內(nèi)力隨時間的增長變化相對較小。而對于沒有考慮預(yù)應(yīng)力鋼束作用的結(jié)構(gòu),若采用滿堂支架施工法施工,結(jié)構(gòu)的恒載內(nèi)力隨時間的增長變化很小;若采用簡支變連續(xù)或者懸臂澆筑法施工,結(jié)構(gòu)的恒載內(nèi)力分布隨著時間的增長趨向于一次成形結(jié)構(gòu)的恒載內(nèi)力。從簡支變連續(xù)施工法和懸臂施工法建造連續(xù)梁橋徐變次內(nèi)力的分析中可以看到,預(yù)應(yīng)力鋼束的存在對連續(xù)梁橋混凝土徐變次內(nèi)力有協(xié)調(diào)作用,制約了其發(fā)展。
[Abstract]:Prestressed concrete continuous beam bridge is one of the most widely used bridges. Its adaptive span can range from 10-40m to 200-300m. At present, the construction methods of continuous beam bridge include cast-in-situ method, simple support and continuous construction method, cantilever construction method and pushing construction method. Studies have shown that the dead load internal forces of the continuous beam bridges constructed by different construction methods are different. The internal force of dead load of continuous beam bridge constructed by cast-in-place method and pushing construction method is the same as that of primary forming structure, but the distribution of internal force of continuous beam bridge constructed by simply supported variable continuous construction method is similar to that of simply supported beam bridge structure. The distribution of dead load internal force of continuous beam bridge constructed by cantilever construction method is similar to that of cantilever beam. Because different construction methods produce different internal force state in concrete continuous beam, and then affect the development of creep, the research on this problem is not enough, which leads to the lack of necessary understanding on the long-term performance analysis of concrete continuous beam. Affects the correctness of the existing bridge assessment. Therefore, the creep effect of prestressed concrete continuous beam bridge constructed by different construction methods is studied in this paper, and its basic law is discussed. The main contents of this paper are as follows: the distribution and evolution trend of dead load internal force of continuous beam bridge constructed by full support construction method, simple support variable continuous construction method and cantilever pouring method are analyzed respectively by using finite element method. Including the consideration of the structural layout of prestressed steel bars and do not consider the prestressed steel bundles two cases, and compared. This paper analyzes the long-term influence of concrete creep on the dead load internal force of the continuous beam bridge constructed by these three construction methods, and selects the typical section of the main beam to carry on the concrete analysis. In the analysis of the evolution of the constant load internal force of the continuous beam constructed by simply supported variable continuous construction method, in addition to the finite element method, the theory of Deisinger's method is used to calculate the dead load internal force of the typical section of the main beam, and the conclusion obtained by the finite element method is compared with that obtained by the finite element method. The results show that the conclusions of the two methods are consistent. For the continuous beam bridge constructed by cantilever pouring method, the influence of the construction process on the internal force of the structure is analyzed by using the stress-free state method, and the measured strain value is compared with the calculated value of the finite element method before the analysis of the evolution of the internal force of the whole bridge. The reliability of the model is verified. The results show that the dead load internal force of the continuous beam with prestressed steel beam is relatively small with the increase of time. However, for structures that do not consider the role of prestressed steel bundles, the dead load internal forces of the structures will change little with time if the construction method of full support is adopted, and if the simple support is changed continuously or the cantilever pouring method is used, The distribution of the dead load internal force of the structure tends to the dead load internal force of the primary forming structure with the increase of time. From the analysis of the secondary internal force of creep of continuous beam bridge constructed by simply supported continuous construction and cantilever construction, it can be seen that the existence of prestressed steel bundle can coordinate the creep secondary internal force of concrete of continuous beam bridge, which restricts its development.
【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】：2017
【分類號】：U445.4

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