桥面系形式对下承式拱桥受力性能的影响
发布时间：2018-08-29 14:39
【摘要】：下承式拱桥在我国发展应用多年，设计理论、施工工艺都相当成熟，但随着交通量、汽车载重的不断增加，桥梁运营能力受到了前所未有的考验。近年来拱桥吊杆断裂事故频发，下承式拱桥的安全问题引起整个桥梁界的关注。本文从桥面系结构形式的角度，探究不同桥面系形式对下承式拱桥受力性能的影响。 本文利用有限元软件ANSYS建立下承式拱桥模型，通过添加纵梁的方式改变桥面系结构形式，做了如下工作： 首先对全桥结构在恒载、满布荷载作用时，吊杆受力的规律进行了初步评价。然后比较了不同桥面系吊杆轴力影响线数值大小。再沿顺桥向不同位置作用车辆荷载，考察吊杆轴力值。然后通过改变纵梁截面尺寸，讨论纵梁刚度对吊杆受力的影响。最后分析了荷载作用位置吊杆失效后，附近吊杆的受力情况。 然后选择桥头、四分之一跨径和跨中截面，分别在这三个截面上沿横向不同车道位置布置车辆荷载，考察不同桥面系中吊杆轴力值和纵梁弯矩、剪力大小，，并分析了横梁截面处一对吊杆轴力分配的规律。然后讨论了荷载在两片拱肋上的横向分布情况，并与传统的杠杆原理法计算横向分布系数进行比较。 最后建立了几何尺寸与下承式拱桥相同的悬索桥模型，分析了悬索桥吊杆轴力影响线大小，与拱桥进行了对比，考察不同端部约束条件下吊杆受力情况。
[Abstract]:With the development and application of through arch bridge in our country for many years, the design theory and construction technology are quite mature, but with the increasing traffic volume and vehicle load, the bridge operation ability has been tested unprecedentedly. From the perspective of structural form, the influence of different deck systems on the mechanical behavior of a through arch bridge is explored.
In this paper, the finite element software ANSYS is used to establish the model of through arch bridge, and the deck structure is changed by adding longitudinal beams.
Firstly, the force distribution of suspenders under dead load and full load is preliminarily evaluated. Then the influence lines of axial force of suspenders on different deck systems are compared. Then the axial force of suspenders is investigated by vehicle loads acting along different positions along the bridge. Then the force distribution of suspenders is discussed by changing the section size of longitudinal beams. Finally, it analyzes the stress condition of the suspender after the failure of the boom.
Then, the axle force of suspender, the bending moment of longitudinal beam and the shear force of longitudinal beam in different deck systems are investigated. The distribution law of axial force of a pair of suspenders at the cross section is analyzed. Then the load on two arch ribs is discussed. The lateral distribution is calculated and compared with the traditional lever principle.
Finally, a suspension bridge model with the same geometric size as the through arch bridge is established, and the influence line of suspension rod axial force is analyzed, and compared with the arch bridge.
【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】：U448.22;U441
本文编号：2211511
[Abstract]:With the development and application of through arch bridge in our country for many years, the design theory and construction technology are quite mature, but with the increasing traffic volume and vehicle load, the bridge operation ability has been tested unprecedentedly. From the perspective of structural form, the influence of different deck systems on the mechanical behavior of a through arch bridge is explored.
In this paper, the finite element software ANSYS is used to establish the model of through arch bridge, and the deck structure is changed by adding longitudinal beams.
Firstly, the force distribution of suspenders under dead load and full load is preliminarily evaluated. Then the influence lines of axial force of suspenders on different deck systems are compared. Then the axial force of suspenders is investigated by vehicle loads acting along different positions along the bridge. Then the force distribution of suspenders is discussed by changing the section size of longitudinal beams. Finally, it analyzes the stress condition of the suspender after the failure of the boom.
Then, the axle force of suspender, the bending moment of longitudinal beam and the shear force of longitudinal beam in different deck systems are investigated. The distribution law of axial force of a pair of suspenders at the cross section is analyzed. Then the load on two arch ribs is discussed. The lateral distribution is calculated and compared with the traditional lever principle.
Finally, a suspension bridge model with the same geometric size as the through arch bridge is established, and the influence line of suspension rod axial force is analyzed, and compared with the arch bridge.
【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】：U448.22;U441
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