单向坡先简支后连续梁桥桥墩偏位成因与处治方法研究
发布时间：2019-05-06 12:15
【摘要】：顺桥向坡度较大的单向坡先简支后连续梁桥在运营过程中，常常会出现桥墩偏位现象，过大的偏位值会影响桥墩受力和变形性能，偏位严重时还会影响整个结构的使用性能。 针对桥墩偏位的情况，本文运用有限元分析软件MIDAS/Civil、MIDAS/FEA建立一联桥空间模型和桥墩实体模型，分析支座病害、温度荷载、桥墩初始缺陷、汽车制动力、桥墩刚度等因素对桥墩偏位的影响情况，探讨引起桥墩偏位的主要原因。 通过研究发现，支座滑移病害对桥墩偏位的影响最大。支座发生边界条件转换、脱空或滑移等病害时，发生病害的支座所对应的桥墩和设置有固定支座的桥墩其墩顶位移和墩底内力均较大，而其他桥墩墩顶位移和墩底内力均较小。而整体温降虽然对墩顶位移影响较小，但会使墩底截面应力和盖梁截面应力急剧增加，，导致截面出现开裂现象。桥墩刚度值的大小对桥墩偏位也有一定的影响，在改善桥墩承载能力时可以从桥墩高度和截面尺寸两方面进行。 桥墩发生偏位后，不仅对上部结构的承载能力和变形有一定的影响，还会对自身的承载能力和变形产生影响。当桥墩偏位超过规定限值时，桥墩承载力将不能满足要求，从而导致截面出现开裂现象。 因此，在支座发生病害时，应及时进行处理，使支座能正常的工作，减小桥墩发生偏位的机率。当桥墩偏位较为严重时，应及时进行纠偏复位，保证整体结构的安全使用性能。
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446
本文编号：2470167
[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.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446
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本文编号：2470167
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