本文選題：彎梁橋 + 徑向力�。� 參考：《長安大學》2016年碩士論文

【摘要】：由于彎梁橋在投入運營后出現(xiàn)了各種各樣的病害,尤其以主梁的橫向爬移最為嚴重。主梁過大的橫向位移往往會導致橋梁的支座剪切破壞、墩柱環(huán)向開裂等的次生病害。如此,不僅嚴重影響到了橋梁的使用壽命,還對橋梁的安全運營造成了威脅。因此,對彎梁橋橫向爬移的機理進行研究,有效地控制主梁的橫向爬移,具有重要的工程應用價值及實踐意義�，F(xiàn)有研究表明,彎梁橋在運營期間受到的徑向力作用是誘發(fā)其橫向爬移的重要原因,但徑向力對主梁橫向爬移的作用機理以及徑向力作用下主梁的橫向爬移規(guī)律卻沒有明確的結(jié)論,需作進一步的研究。本文針對徑向力作用下彎梁橋的橫向爬移問題,借助于有限元軟件ANSYS建立空間有限元模型,對主梁的橫向爬移情況進行了分析研究。本文主要研究內(nèi)容如下:(1)通過查閱相關(guān)資料,總結(jié)前人在彎梁橋橫向爬移研究方面的成果以及研究現(xiàn)狀,指出徑向力作用下彎梁橋橫向爬移研究的不足。(2)對ANSYS有限元建模過程中的重要參數(shù)及方法進行了討論,重點圍繞支座的模擬、徑向力時程的計算展開分析研究,提出了將盆式橡膠支座等效為三個不同剛度的彈簧、板式橡膠支座建立其實體仿真模型的支座模擬方法,并通過算例對其準確性進行了驗證,同時也對是否考慮車橋耦合效應時徑向力的取值進行了計算分析。(3)采用ANSYS的彈性時程分析,對主梁分別在不考慮車橋耦合效應、考慮車橋耦合效應時主梁的爬移情況進行了一系列的仿真計算,獲得了全橋在上述徑向力作用下的動力響應,深入分析了主梁關(guān)鍵截面的位移時程曲線、支座反力時程曲線,并對不同情況下主梁的爬移趨勢進行對比分析,分別探討了徑向力的大小、車橋耦合效應對主梁橫向爬移的影響,總結(jié)了主梁在徑向力作用下的爬移規(guī)律。(4)選取考慮車橋耦合效應時主梁的爬移狀態(tài),對主梁在殘余位移狀態(tài)下考慮混凝土的收縮徐變效應時主梁的恢復力進行了計算分析,獲取了主梁關(guān)鍵截面處恢復力的變化值,并對計算結(jié)果進行比較分析,總結(jié)了混凝土收縮徐變對主梁恢復力的影響情況。(5)通過對徑向力作用下主梁爬移的數(shù)值模擬分析,得到了主梁在徑向力作用下的爬移規(guī)律,提出了徑向力作用下主梁的爬移機理;并對本文的研究進行了展望,對其中尚需改進和進一步研究的問題進行了總結(jié)。希望通過本文的研究,能夠?qū)澚簶虻陌l(fā)展有一定的價值和意義,為彎梁橋的安全運營添磚加瓦。
[Abstract]:There are various diseases in the curved girder bridge after it is put into operation, especially the transverse movement of the main beam is the most serious. The transverse displacement of the main beam often leads to the secondary diseases such as the shear failure of the support and the circumferential cracking of the pier column. In this way, not only the service life of the bridge is seriously affected, but also the safe operation of the bridge is threatened. Therefore, it is of great value and practical significance to study the mechanism of lateral movement of curved girder bridge and control the lateral movement of main beam effectively. Existing studies show that the radial force of curved girder bridge during operation is an important reason to induce its lateral movement. However, there is no clear conclusion on the mechanism of radial force acting on the lateral movement of the main beam and the law of lateral movement of the main beam under the action of radial force, which needs to be further studied. Aiming at the lateral creep of curved beam bridge under radial force, this paper establishes a spatial finite element model with the help of finite element software ANSYS, and analyzes and studies the lateral movement of the main beam. The main research contents of this paper are as follows: 1) by referring to relevant data, the paper summarizes the achievements and research status of previous researches on lateral movement of curved girder bridges. It is pointed out that the deficiency of the research on lateral creep of curved beam bridge under radial force is to discuss the important parameters and methods in the finite element modeling process of ANSYS, focusing on the simulation of support and the calculation and analysis of radial force time history. In this paper, the method of simulating the solid simulation model of the spring and plate rubber bearing with three different stiffness is put forward, and the accuracy of the simulation model is verified by an example. At the same time, the radial force is calculated and analyzed when the coupling effect of vehicle and bridge is taken into account. The elastic time history analysis of ANSYS is used, and the coupling effect of vehicle and bridge is not considered separately for the main beam. A series of simulation calculations are carried out on the climbing and moving of the main beam considering the vehicle-bridge coupling effect, and the dynamic response of the whole bridge under the radial force is obtained. The displacement time history curve of the key section of the main beam and the reaction time history curve of the support are analyzed in depth. By comparing and analyzing the movement trend of main beam under different conditions, the influence of radial force and vehicle-bridge coupling effect on lateral movement of main beam is discussed respectively. This paper summarizes the crawling law of main beam under radial force. (4) selecting the climbing state of main beam considering the coupling effect of vehicle and bridge, and calculating and analyzing the restoring force of main beam when considering the shrinkage and creep effect of concrete under the condition of residual displacement. The change value of the restoring force at the key section of the main beam is obtained, and the calculated results are compared and analyzed. The influence of concrete shrinkage and creep on the restoring force of the main beam is summarized. The crawling law of main beam under radial force is obtained, and the mechanism of main beam crawling under radial force is put forward, and the research of this paper is prospected, and the problems that need to be improved and further studied are summarized. It is hoped that the research in this paper will have certain value and significance for the development of curved girder bridge and contribute to the safe operation of the curved beam bridge.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U445.71

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