装配式板梁桥铰缝粘结抗剪性能研究

发布时间：2018-01-10 17:17

本文关键词：装配式板梁桥铰缝粘结抗剪性能研究　出处：《安徽工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：装配式板梁桥是我国中小跨径桥梁中使用普遍的一种桥型，而铰缝损伤则是该类桥型上部结构出现问题的主要原因。检测结果表明，，铰缝损伤会降低装配式板梁桥整体受力性能，严重者甚至出现单板受力情况，产生桥梁安全事故。本文以装配式板梁桥铰缝损伤为对象开展研究，主要内容如下：首先，基于新旧混凝土粘结机理、铰缝混凝土受力特点和破坏特征，针对有限元软件Abaqus接触模块中面与面之间粘结行为“traction-separation”关系曲线进行研究，结合相关研究文献，确定了“traction-separation”关系曲线中接触面粘结滑移刚度、粘结应力界限、最终滑移值。同时，建立实桥模型进行分析，与实桥荷载试验对比，两者结果吻合度很好，表明了文中有限元建模的正确性。其次，制作了五组铰缝抗剪试件，试件分别采用不同铰缝接触面构造形式，对比研究不同接触面构造形式的铰缝承载力大小，试验结果表明，采用铰缝抗剪钢筋可以提高铰缝极限承载力，但对接触面粘结滑移刚度起减小作用；采用较小配钢率钢板抗剪键能够提高接触面粘结滑移刚度；普通素混凝土铰缝形式接触面法向粘结应力小于理论计算值；在接触面设置抗剪钢筋和钢板抗剪键均能提高接触面法向和切向粘结应力极限。最后，根据试验结果，进一步提出了钢板抗剪键和抗剪钢筋组合使用的铰缝接触面构造形式，将该构造形式与普通素混凝土铰缝形式以及板梁整体现浇无铰缝形式进行数值分析，对比三者之间横向刚度和承载力的区别。结果表明，采用钢板抗剪键和抗剪钢筋组合使用的铰缝接触面构造形式可以大大提高板梁间横向刚度，铰缝承载力也可以得到提高。
[Abstract]:Fabricated slab girder bridge is a common type of bridge used in medium and small span bridges in China. The damage of hinged joints is the main cause of the problems of this type of bridge superstructure. The test results show that. Joint damage will reduce the overall mechanical performance of prefabricated slab girder bridge, or even single plate force situation, resulting in bridge safety accidents. This paper takes the hinge joint damage of prefabricated slab beam bridge as the object of study. The main contents are as follows: Firstly, based on the bond mechanism of new and old concrete, the stress characteristics and failure characteristics of hinged concrete are discussed. The bond behavior "traction-separation" relation curve between the middle plane and the plane of the finite element software Abaqus contact module is studied. The bond-slip stiffness, bond stress limit and ultimate slip value of the contact surface in the "traction-separation" curve are determined. At the same time, the real bridge model is established for analysis. Compared with the actual bridge load test, the results are in good agreement with each other, which indicates the correctness of the finite element method. Secondly, five groups of joint shear specimens are made. The joints are constructed in different joints, and the bearing capacity of joints with different joints is compared. The test results show that. The ultimate bearing capacity of hinged joints can be increased by using shearing steel bar, but the bond-slip stiffness of contact surface can be reduced. The bond slip stiffness of the contact surface can be improved by using the shear bond of the steel plate with small proportion of steel. The normal bond stress of the common plain concrete joint is less than the theoretical value. The normal and tangential bond stress limit of the contact surface can be increased by setting shear bar and steel plate shear bond on the contact surface. Finally, according to the test results, the joint joint structure of steel plate and shear bar is further proposed. The structural form is numerically analyzed with plain concrete hinge joint and slab beam cast-in-situ without hinged joint, and the difference of transverse stiffness and bearing capacity between them is compared. The transverse stiffness and the bearing capacity of hinged joints can be greatly improved by using the joint structure of steel plate and steel bar combined with shear bar.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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