青草背长江大桥正交异性钢桥面板受力特性的研究

发布时间：2018-05-18 02:20

本文选题：正交异性钢桥面板 + 受力特性　；参考：《重庆交通大学》2014年硕士论文

【摘要】：正交异性钢桥面板因其有较为突出的优点而被各国广泛应用，但因其结构和受力较为复杂，随着各种已建桥梁的运营，各种疲劳破坏问题相继出现。在国外很多国家对实桥进行了长期的监测或进行足尺模型试验，从而对正交异性钢桥面板的受力性能进行研究，但是国内对正交异性钢桥面板的受力特性缺乏试验数据的积累。为了积累更多有效的试验数据以及更好地了解正交异性钢桥面板在车辆荷载作用下的受力特点，本文以涪陵青草背长江大桥正交异性钢桥面板为研究背景，分析其各构造细节处的应力分布情况。本文将基于涪陵青草背长江大桥钢桥面板的实测应力数据从而对其受力性能进行研究。该桥已在加劲梁关键部位上安装了相应的传感器，通车后可获得大量的实测应力数据；同时运用ANSYS有限元软件模拟车辆荷载在正交异性钢桥面板上加载，计算典型细节的应力；最后综合分析实测数据与理论数据，总结正交异性钢桥面板的受力特点。文中还比较了不同的顶板厚度、不同的U形纵肋厚度、不同的横隔板厚度、不同的横隔板高度、不同的横隔板弧形缺口尺寸等以及不同的桥面铺装层对各构造细节处应力的影响程度，并且分析了减小其上应力的比较可靠的有效方法。论文研究的结果表明，增大U形纵肋的厚度是减小U形加劲钢桥面板在U形纵肋与横隔板连接处应力的最有效的方法；增大顶板厚度和增大U形纵肋厚度，都能有效地减小U形加劲钢桥面板在面板与U形纵肋连接处的应力；增大横隔板厚度比增大面板厚度和增大U形纵肋厚度更能有效地降低U形加劲钢桥面板在横隔板与面板连接处的应力；增大横隔板厚度是减小横隔板弧形缺口处应力的最可靠的办法；横隔板高度为700时，能大大地降低U形纵肋与横隔板连接处的应力，对整个正交异性钢桥面板的受力是非常有利的；横隔板弧形缺口尺寸b为不小于25以及h为80时，对正交异性钢桥面板是受力是最有利的；桥面板有铺装时与无铺装时相比，能改善结构的受力；铺装层弹性膜量的增大能在一定程度上改善桥面板的受力，但不是很明显；铺装层厚度的增加是降低钢桥面板上应力的较为有效的方法之一。
[Abstract]:Orthotropic steel bridge face slab has been widely used in many countries because of its outstanding advantages. However, due to its complex structure and force, with the operation of various bridges, various fatigue failure problems have emerged one after another. In many foreign countries, long-term monitoring or full-scale model tests have been carried out to study the mechanical behavior of orthotropic steel bridge panels. However, there is no accumulation of experimental data on the stress characteristics of orthotropic steel bridge panels in China. In order to accumulate more effective test data and better understand the bearing characteristics of orthotropic steel bridge slab under vehicle load, this paper takes the orthotropic steel bridge slab of Qingcaobei Yangtze River Bridge in Fuling as the research background. The stress distribution at various structural details is analyzed. Based on the measured stress data of the steel deck of the Qingcaobei Yangtze River Bridge in Fuling, this paper studies its mechanical performance. The bridge has installed the corresponding sensors on the key parts of the stiffening beam, and a large number of measured stress data can be obtained after opening to traffic. At the same time, the ANSYS finite element software is used to simulate the vehicle load loading on the orthotropic steel bridge face slab to calculate the stress of typical details. Finally, the mechanical characteristics of orthotropic steel bridge face slab are summarized by synthetically analyzing the measured and theoretical data. The thickness of the roof, the thickness of the U-shaped longitudinal rib and the height of the transverse diaphragm are also compared. The influence of different transverse partition arc notch size and different deck pavement on the stress in each structure detail is analyzed and the more reliable and effective method to reduce the stress on the bridge deck is analyzed. The results show that increasing the thickness of U-shaped longitudinal rib is the most effective method to reduce the stress of U-shaped stiffened steel bridge face at the joint of U-shaped longitudinal rib and transverse partition plate, increasing the thickness of roof and increasing the thickness of U-shaped longitudinal rib. Both of them can effectively reduce the stress of U-stiffened steel bridge face at the joint between the panel and the U-shaped longitudinal rib. Increasing the thickness of the transverse diaphragm is more effective than increasing the thickness of the panel and increasing the thickness of the U-shaped longitudinal rib. Increasing the thickness of the transverse diaphragm is the most reliable way to reduce the stress at the arc notch of the transverse partition, and when the height of the transverse partition is 700, the stress at the junction between the U-shaped longitudinal rib and the transverse partition can be greatly reduced. It is very beneficial to the whole orthotropic steel bridge panel, when the transverse diaphragm arc notch size b is not less than 25 and h is 80, the orthotropic steel bridge slab is the most favorable force. It can improve the stress of the structure, the increase of elastic membrane of the pavement layer can improve the stress of the bridge deck to some extent, but it is not obvious. The increase of the thickness of the pavement layer is one of the more effective methods to reduce the stress on the steel bridge slab.
【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】：U448.36;U441

【参考文献】