發(fā)布時間：2018-04-19 05:05

  本文選題：吊桿拱橋 + 索力監(jiān)控��； 參考：《吉林大學(xué)》2014年碩士論文

【摘要】：鋼管混凝土系桿拱橋是一種新型的梁拱組合體系橋梁。該體系主要由拱肋，系梁，吊桿等結(jié)構(gòu)構(gòu)成。吊桿作為系梁和拱肋的之間的聯(lián)系構(gòu)件，其受力狀態(tài)是否合理可靠直接影響著整個橋梁的受力性能，從而將決定著橋梁工作時是否安全可靠。而在系桿拱橋中，尤其對于大跨徑橋梁的吊桿張拉都不是一步到位的，吊桿索力需要多次的張拉調(diào)整，才能達到施工設(shè)計所要求的受力狀態(tài)以及成橋的整體線形的要求。系桿拱橋這種內(nèi)部超靜定，外部靜定的結(jié)構(gòu)體系再加上混凝土收縮，徐變的影響使得拱橋的受力狀態(tài)更加復(fù)雜。由于結(jié)構(gòu)體系的復(fù)雜性，在橋梁的施工期間再精確的理論計算也不能完全代替現(xiàn)場監(jiān)測工作。因此，在吊桿張拉期間，對吊桿索力進行監(jiān)測，依據(jù)監(jiān)測結(jié)果制定詳盡合理的張拉方案是十分必要的。 另一方面，在橋梁的使用過程中，由于吊桿本身存在松弛和應(yīng)力損失，再加上交通荷載的交變作用，吊桿的索力隨著橋梁使用會發(fā)生變化。工程實踐表明，吊桿索力的退化是一個隨機的、非線性過程。因此可以認為在橋梁的運營期間，對吊桿索力的監(jiān)測同樣也是十分重要的。由于吊桿拱橋的吊桿有效長度較短，在橋梁運營期間的監(jiān)測需要一些必要的數(shù)據(jù)�；A(chǔ)數(shù)據(jù)的獲得最為有效的手段便是通過在吊桿張拉期間對吊桿進行監(jiān)測，這一點同樣說明了吊桿張拉期間進行施工監(jiān)測的必要性。 本文以趙王河橋吊桿張拉施工監(jiān)控作為工程依托，主要開展了以下研究工作： 1、首先對吊桿拱橋的力學(xué)特征進行了簡要的分析，從施工階段各個構(gòu)件的安全性出發(fā)，對吊桿張拉任務(wù)進行了分解，對吊桿張拉各過程中的關(guān)鍵技術(shù)進行了探討。 2、依據(jù)設(shè)計參數(shù)，采用MIDAS\Civil建立了趙王河橋的有限元理論分析模型�；谟绊懢仃嚭偷惴ńY(jié)合有限元理論分析模型模擬了吊桿施工過程、分析了吊桿力的求解過程，制定了相應(yīng)的張拉方案，通過理論計算使吊桿拱橋的最終成橋索力達到設(shè)計要求。 3、結(jié)合已有的振動理論基礎(chǔ)，對頻率法測試索力的原理進行了介紹，并討論了應(yīng)用頻率法求解索力的三種理論計算模型�？紤]在實際工程中，，由于索的長度、安裝的阻尼器、抗彎剛度都會給模型帶來一定影響，對模型進行修正或者結(jié)合一些新的算法，來得到更精確的結(jié)果，形成了一種精度較高的基于振動試驗測定頻率計算索力的方法。 4、結(jié)合實際工程，根據(jù)制定的張拉方案，通過頻率法測試索力對吊桿張拉和索力調(diào)整施工階段的索力進行實時監(jiān)控，并對關(guān)鍵截面應(yīng)力、位移進行了監(jiān)測。對各次監(jiān)測結(jié)果進行綜合分析驗證了本文中方法的有效性。
[Abstract]:Concrete-filled steel tubular tied arch bridge is a new type of beam-arch composite system bridge.The system is mainly composed of arch rib, tie beam, suspender and so on.As the connection member between the tie beam and arch rib, whether the stress state is reasonable or not will directly affect the behavior of the whole bridge, which will determine the safety and reliability of the bridge.However, in the tied arch bridge, especially for the long-span bridge, the tension of the suspension rod is not in one step. The cable force of the suspension rod needs many tensioning adjustments to meet the requirements of the construction design and the integral alignment of the bridge.The internal statically indeterminate and external statically indeterminate structure system of tied arch bridge and the shrinkage of concrete make the stress state of arch bridge more complicated.Due to the complexity of the structure system, no accurate theoretical calculation can completely replace the field monitoring work during the construction of the bridge.Therefore, it is necessary to monitor the cable force of the suspender and make a detailed and reasonable tensioning scheme according to the monitoring results.On the other hand, during the use of the bridge, the cable force of the suspender will change with the use of the bridge because of the relaxation and stress loss of the suspender itself and the alternating action of traffic load.Engineering practice shows that the degradation of cable force is a stochastic and nonlinear process.Therefore, it is also very important to monitor the cable force of the suspenders during the operation of the bridge.Because of the short effective length of suspension arch bridge, some necessary data are needed for monitoring during bridge operation.The most effective way to obtain the basic data is to monitor the boom during the tension period, which also shows the necessity of construction monitoring during the tension period.Based on the construction supervision and control of the suspension rod of Zhaowanghe River Bridge, the following research work has been carried out in this paper:1. Firstly, the mechanical characteristics of the suspender arch bridge are analyzed briefly. From the security of each component in the construction stage, the task of tension is decomposed, and the key techniques in the process are discussed.2. According to the design parameters, the finite element analysis model of Zhao Wang River Bridge is established by using MIDAS\ Civil.Based on the influence matrix and iterative algorithm combined with the finite element theory analysis model, the construction process of the suspender is simulated, the solution process of the suspender force is analyzed, and the corresponding tensioning scheme is worked out.Through theoretical calculation, the final cable force of suspender arch bridge meets the design requirements.3. Based on the existing vibration theory, the principle of measuring cable force by frequency method is introduced, and three kinds of theoretical calculation models for solving cable force by frequency method are discussed.Considering that in actual engineering, the length of cable, the installed dampers, and the flexural stiffness will have a certain impact on the model, the model can be modified or combined with some new algorithms to get more accurate results.A method for calculating cable force based on vibration test is developed.4. Combining with the actual project, according to the tensioning scheme, the cable force in the construction stage of the cable tension and the cable force adjustment is monitored by the frequency test method, and the stress and displacement of the key section are monitored.The effectiveness of this method is verified by comprehensive analysis of the monitoring results.
【學(xué)位授予單位】：吉林大學(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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