坡桥桥墩偏位成因与解决措施研究

发布时间：2018-04-30 11:02

本文选题：模拟分析 + 桥墩偏位　；参考：《重庆交通大学》2015年硕士论文

【摘要】：重庆地处山岭重丘区,山高谷深,高墩坡桥相对较多。由于各种原因导致这些桥梁出现墩柱偏移、梁体偏移或滑移等支座相关病害,最严重的情况下梁体几乎掉在盖梁上,严重威胁桥梁运营安全。因此,对坡桥桥墩偏位原因分析研究变得尤为重要。本文基于有限元软件MIDAS/Civil与ABAQUS对桥墩偏位进行建模分析计算,主要工作如下:①结合李家湾大桥工程实例,使用MIDAS/Civil软件的有限元平台,建立李家湾大桥模型,分析比较了正常支座与支座安装倾斜在施加常规桥梁荷载分析桥墩偏位的结果,以及支座倾斜时桥墩墩顶受力分析,初步确定李家湾大桥大偏位的产生原因为支座安装倾斜。另外,研究分析了支座安装缺陷、支座剪切破坏演变过程以及支座脱空对桥梁受力的影响分析。得出了支座安装缺陷对桥墩影响比较大,对主梁的影响比较小;支座破坏的演变过程让桥墩偏位处于恶性循环的状态;支座脱空方式的不同对主梁的影响不同,可选择性处理。②利用有限元软件ABAQUS建立双柱墩有限元模型,分析比较了双柱墩不同墩高、不同墩径、不同墩截面以及不同桥梁纵坡坡度的桥墩偏位与应力结果。研究表明:随着墩高的不断变化,在墩高增大时偏位值与应力值都在不断升高。随着墩径的不断变化,在墩径增大时偏位值与应力值都在不断降低。在试图减少墩径的尺寸时,桥墩偏位、最大应力计算值会越来越大,并且增大趋势在墩径减少越来越快。圆形截面的桥墩计算得到的墩顶位移以及墩底应力是最安全合力的。③结合全文研究的基础下试图优化支座,增加支座最大允许位移,并且细化设计支座局部钢件几何尺寸。另外,提出了支座的安装方法以及安装注意事项。同时,结合研究结果提出相关桥梁设计建议。
[Abstract]:Chongqing is located in the mountainous and heavy-hilly area, the mountains are high and the valley is deep, and there are relatively many bridges with high piers and slopes. As a result of various reasons these bridges appear pier column offset beam body offset or slippage and other supporting related diseases. In the most serious case the beam body almost falls on the cover beam which seriously threatens the safety of bridge operation. Therefore, it is very important to analyze and study the reason of bridge pier deviation. In this paper, based on the finite element software MIDAS/Civil and ABAQUS, the bridge pier deflection is modeled and calculated. The main work is as follows: 1. Combining with the Lijiawan Bridge engineering example, using the finite element platform of MIDAS/Civil software, the model of Lijiawan Bridge is established. This paper analyzes and compares the results of normal bearing and bearing installation tilt on the application of conventional bridge load to the analysis of pier deflection, as well as the force analysis on the top of pier when the support tilts. It is preliminarily determined that the cause of the great deviation of Lijiawan Bridge is the bearing installation inclination. In addition, the defects of bearing installation, the evolution process of support shear failure and the influence of support detachment on bridge force are analyzed. It is concluded that the defect of bearing installation has a great influence on the bridge piers and has little effect on the main beam; the evolution process of the bearing failure causes the pier to deviate in a vicious circle; the different ways of the support emptying have different effects on the main beam. Optional treatment .2 the finite element model of double-column pier is established by using finite element software ABAQUS, and the results of pier deflection and stress are analyzed and compared with different piers with different height, different piers diameter, different piers section and different slope of bridge longitudinal slope. The results show that with the increasing of pier height, both the deflection value and the stress value are increasing. With the continuous change of pier diameter, the deviation value and stress value are decreasing as the pier diameter increases. When trying to reduce the size of pier diameter, the maximum stress value will become larger and larger, and the increasing trend will decrease more and more quickly. The displacement of the pier top and the stress at the bottom of the pier obtained from the calculation of the pier with circular section are the safest resultant force. 3. Based on the research of the full text, this paper attempts to optimize the support, increase the maximum allowable displacement of the support, and refine the geometric dimensions of the local steel parts of the design support. In addition, the installation method of the bearing and the matters needing attention are put forward. At the same time, based on the results of the study, some suggestions on bridge design are put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U443.22

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