混凝土拱桥的加固方案研究

发布时间：2018-03-14 21:35

本文选题：旧桥加固　切入点：技术状况评定　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：过去的数十年里,本国的经济水平发展速度迅猛。相应的,交通运输量和汽车的荷载也在大幅增加,很多桥梁都出现了不同程度的损伤。对这些旧桥进行加固,使其能继续为公共交通服务已成为当下亟需解决的问题。本文结合大连胜利桥的加固实例,主要研究了以下几方面内容： (1)对该桥进行详尽的现场检测,通过对桥面系、上部结构、下部结构和桥面装饰的检测给出具体的检测结果；通过检测结果对桥梁相应的部分进行桥体技术状况的评定,进而得出桥梁的整体技术状况的评定结论,说明该桥加固的必要性。 (2)对该桥进行有限元的模拟分析,根据现场勘测的拱圈线型,建立有限元模型,并对桥梁的拱圈截面做相应的折减,使其更加符合实际的受力情况。通过有限元计算,验证了该桥需要进行加固的结论,并在此基础上提出了两种不同的加固方案。 (3)对于所提出的两种方案进行有限元分析,根据计算结果,对两种方案的反力、位移、内力、应力的结果进行逐项对比,通过对比结果和桥梁加固方案的选择原则确定粘贴钢板为最后的加固方案。 (4)研究粘贴钢板加固界面上的剪切应力。对于所选定的方案进行加固界面上的剪切应力的分析,根据所建立实体有限元模型的计算,得出混凝土和钢板接触面上的剪切应力。通过计算结果和现在通用结构胶6202抗剪强度的对比可得抗剪强度满足受力要求,加固后结构安全、可靠。
[Abstract]:Over the past few decades, the country's economic level has grown rapidly. Accordingly, traffic and vehicle loads have increased dramatically, and many bridges have been damaged to varying degrees. These old bridges have been strengthened. So that it can continue to serve for public transport has become an urgent problem to be solved. In this paper, combining with Dalian Shengli Bridge reinforcement example, the following aspects are mainly studied:. Through the detection of bridge deck system, superstructure, substructure and deck decoration, the concrete test results are given, and the bridge technical status of the corresponding part of the bridge is evaluated by the test results. Finally, the evaluation conclusion of the whole technical condition of the bridge is obtained, and the necessity of strengthening the bridge is explained. The finite element analysis of the bridge is carried out, and the finite element model is established according to the arch ring alignment surveyed in the field, and the section of the arch ring of the bridge is reduced accordingly to make it more in line with the actual stress situation. The conclusion that the bridge needs to be strengthened is verified, and two different reinforcement schemes are put forward. The finite element analysis of the two schemes is carried out. According to the calculation results, the results of reaction, displacement, internal force and stress of the two schemes are compared one by one. By comparing the results and the selection principle of the bridge reinforcement scheme, the bonding steel plate is determined as the final reinforcement plan. (4) the shear stress on the interface of the bonded steel plate is studied. For the selected scheme, the shear stress at the interface is analyzed, and the calculation of the finite element model is carried out according to the established finite element model. The shear stress on the contact surface of concrete and steel plate is obtained. By comparing the calculation results with the shear strength of current structural adhesive 6202, it is found that the shear strength can meet the stress requirements, and the strengthened structure is safe and reliable.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

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