本文選題：鋼管混凝土拱橋　切入點：有限元仿真分析　出處：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：拱橋作為一種古老的橋型，在我們國家的橋梁史上留下了光輝的歷史。鋼管混凝土拱橋則是基于對鋼管混凝土新技術(shù)應(yīng)用于古代拱橋中發(fā)展起來的新型拱橋。近年來，異軍突起的鋼管混凝土系桿拱橋，是60-200m主跨徑范圍內(nèi)非常具有競爭力的橋型之一。吊桿是重要的結(jié)構(gòu)在下承式系桿拱橋中，橋梁的受力狀況受吊桿張拉力影響較大，尤其是對主梁和拱肋。 本文的工程背景為沈丹線太子河系桿拱橋，利用MIDAS CIVIL計算軟件對全橋建立了有限元模型，，并且對該模型進行了有限元分析。吊桿的張力根據(jù)力的平衡法確定，確保了拱肋和主梁有更理想的恒載彎矩分布，吊桿的受力更均勻。利用倒裝法計算出施工階段的吊桿初始張力。通過優(yōu)化調(diào)整吊桿張拉力，令主梁以及拱肋的內(nèi)力更趨于合理。對成橋前后吊桿的受力變化進行了對比，看出活載使得吊桿張力增加，索力有大概一致的增幅，活載對吊桿的影響較大。本文的主線是系桿拱橋吊桿力張拉調(diào)整，利用三種不同的方法對吊桿力優(yōu)化調(diào)整并從不同的角度進行了比較分析，這三種方法分別是剛性吊桿法、一次落架法、剛性支承梁法。根據(jù)該橋的實際情況以及計算結(jié)果，不論從設(shè)計還是施工上，一次落架法都能夠滿足要求；接著對太子河系桿拱橋的吊桿張拉順序方案1、方案2作對比計算分析，通過張拉順序方案的比較，得出方案2更為合理可靠。 最后對索力測試原理進行了介紹，重點介紹了頻率法。該橋的索力測試應(yīng)用了頻率法。通過對吊桿索力實測值和本階段目標(biāo)索力值比較，相對誤差均在10%以內(nèi)，滿足落架條件，可以進行系梁落架。待落架完成后，測試了各個吊桿的索力，并且通過與設(shè)計值的比較確定是否調(diào)索，以保證每根吊桿的索力均沒有超過設(shè)計誤差的允許范圍。 根據(jù)索力的測試結(jié)果并根據(jù)設(shè)計院提供的目標(biāo)索力進行了兩次調(diào)索，由調(diào)索完成后的結(jié)果可以看出，全橋吊桿力控制均勻，每根吊桿的目標(biāo)值與實際測量值吻合較好，目標(biāo)值與實際測量值的誤差都在合理的誤差范圍以內(nèi)，從全橋和局部來看都是理想的，滿足設(shè)計對吊桿力的要求。
[Abstract]:As an ancient bridge type, arch bridge has left a glorious history in the history of bridges in our country.Concrete-filled steel tubular (CFST) arch bridge is a new arch bridge based on the application of new concrete filled steel tube (CFST) technology to ancient arch bridges.In recent years, Concrete-filled steel tubular tied arch bridge is one of the most competitive bridges in the range of 60-200 m main span.The suspension rod is an important structure in the through tie arch bridge, the stress condition of the bridge is greatly affected by the tension of the suspender, especially to the main beam and arch rib.In this paper, the finite element model of the whole bridge is established by using MIDAS CIVIL software, and the finite element analysis of the model is carried out.The tension of the suspender is determined by the method of force balance, which ensures that the arch rib and the main beam have more ideal distribution of dead load bending moment, and the force of the suspender is more uniform.The initial tension of the suspender in the construction stage is calculated by using the inversion method.By optimizing the tension of the suspender, the internal force of the main beam and arch rib is more reasonable.By comparing the stress changes of the suspenders before and after the bridge, it is found that the live load increases the tension of the suspenders, and the cable force increases roughly, and the live load has a great influence on the suspenders.The main line of this paper is the tension adjustment of suspenders of tied arch bridge. Three different methods are used to optimize and analyze the force of suspenders. The three methods are rigid suspension method, primary fall method and rigid support beam method.According to the actual situation of the bridge and the result of calculation, the single drop frame method can meet the requirements in both design and construction.Through the comparison of tensioning sequence scheme, it is concluded that scheme 2 is more reasonable and reliable.Finally, the principle of cable force measurement is introduced, and the frequency method is emphasized.The frequency method is used to test the cable force of the bridge.The relative error is less than 10% by comparing the measured value of suspension cable force with the value of target cable force at this stage, which satisfies the condition of falling frame, and can be used to tie beam drop frame.After the drop frame is finished, the cable force of each suspender is tested, and whether the cable is adjusted or not is determined by comparing with the design value to ensure that the cable force of each suspension does not exceed the allowable range of the design error.According to the test results of the cable force and the target cable force provided by the design institute, the cable is adjusted twice. From the results of the cable adjustment, it can be seen that the force of the suspension rod of the whole bridge is controlled evenly, and the target value of each suspender is in good agreement with the actual measured value.The error between the target value and the actual measurement value is within the reasonable error range, which is ideal from the whole bridge and the local point of view, and meets the requirements of the design for the suspender force.
【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】：2014
【分類號】：U448.225

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