【摘要】：順橋向坡度較大的單向坡先簡支后連續(xù)梁橋在運營過程中，常常會出現(xiàn)橋墩偏位現(xiàn)象，過大的偏位值會影響橋墩受力和變形性能，偏位嚴重時還會影響整個結(jié)構(gòu)的使用性能。 針對橋墩偏位的情況，本文運用有限元分析軟件MIDAS/Civil、MIDAS/FEA建立一聯(lián)橋空間模型和橋墩實體模型，分析支座病害、溫度荷載、橋墩初始缺陷、汽車制動力、橋墩剛度等因素對橋墩偏位的影響情況，探討引起橋墩偏位的主要原因。 通過研究發(fā)現(xiàn)，支座滑移病害對橋墩偏位的影響最大。支座發(fā)生邊界條件轉(zhuǎn)換、脫空或滑移等病害時，發(fā)生病害的支座所對應(yīng)的橋墩和設(shè)置有固定支座的橋墩其墩頂位移和墩底內(nèi)力均較大，而其他橋墩墩頂位移和墩底內(nèi)力均較小。而整體溫降雖然對墩頂位移影響較小，但會使墩底截面應(yīng)力和蓋梁截面應(yīng)力急劇增加，，導(dǎo)致截面出現(xiàn)開裂現(xiàn)象。橋墩剛度值的大小對橋墩偏位也有一定的影響，在改善橋墩承載能力時可以從橋墩高度和截面尺寸兩方面進行。 橋墩發(fā)生偏位后，不僅對上部結(jié)構(gòu)的承載能力和變形有一定的影響，還會對自身的承載能力和變形產(chǎn)生影響。當橋墩偏位超過規(guī)定限值時，橋墩承載力將不能滿足要求，從而導(dǎo)致截面出現(xiàn)開裂現(xiàn)象。 因此，在支座發(fā)生病害時，應(yīng)及時進行處理，使支座能正常的工作，減小橋墩發(fā)生偏位的機率。當橋墩偏位較為嚴重時，應(yīng)及時進行糾偏復(fù)位，保證整體結(jié)構(gòu)的安全使用性能。
[Abstract]:In the course of operation, the bridge pier deviation phenomenon often occurs in the operation process of the one-way slope along the bridge slope, which is simply supported and then continuous beam bridge. The excessive deviation value will affect the stress and deformation performance of the bridge pier, and the service performance of the whole structure will also be affected when the deviation is serious. In view of the deflection of pier, this paper establishes a space model and a solid model of bridge pier by using finite element analysis software MIDAS/Civil,MIDAS/FEA, and analyzes the bearing disease, temperature load, initial defect of pier, braking force of automobile, and so on. The influence of pier stiffness and other factors on pier deviation is discussed, and the main causes of pier deviation are discussed. It is found that the bearing slip disease has the greatest influence on the deflection of the pier. When the boundary conditions change, empty or slip occur, the displacement of the pier top and the internal force of the bottom of the pier are larger, but the displacement of the top of the pier and the internal force of the bottom of the pier of the other piers are smaller than that of the pier with the fixed support and the corresponding pier and the bridge pier with the fixed support have large displacement at the top of the pier and internal force at the bottom. However, although the overall temperature drop has little effect on the displacement of the pier top, the cross-section stress at the bottom of the pier and the cross-section stress of the cover beam will increase sharply, which will lead to the cracking of the cross-section. The value of pier stiffness also has a certain effect on pier deflection. The bearing capacity of pier can be improved from two aspects: pier height and cross-section size. The deflection of bridge pier not only affects the bearing capacity and deformation of the superstructure, but also affects the bearing capacity and deformation of the superstructure. When the deflection of the pier exceeds the prescribed limit, the bearing capacity of the pier will not meet the requirements, which will lead to the cracking of the cross-section. Therefore, in the event of bearing disease, it should be dealt with in time, so that the support can work normally and reduce the probability of bridge pier deviation. When the pier deviation is serious, the deviation correction and reset should be carried out in time to ensure the safety performance of the whole structure.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U446

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