混凝土箱梁桥抗倾覆性能与增强措施研究

发布时间：2018-03-08 05:17

本文选题：梁桥　切入点：横向稳定　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国交通的不断发展,截止到2014年底,我国已建75.71万座桥梁,达到世界领先水平。桥梁不仅使得道路跨越江河湖海成为现实,而且为城市道路的互通立交带来了便利,对道路通畅起着至关重要的作用。在我国所建设的桥梁中,箱型梁桥是应用非常广泛的桥型,其主要特点是抗扭刚度大,而且外形美观,线条流畅,视觉效果好,非常适用于位于小半径曲线上的城市高架桥或互通匝道桥。然而,近年来桥梁事故多发,多起箱梁桥横向倾覆事故引起社会较大反响,越来越多的工程师与学者开始分析事故发生的原因,希望能够最大限度地防止事故的再次发生。本文介绍了箱梁桥的发展及近年来梁桥抗倾覆的研究现状,分析了国内外规范的相关规定,并借助工程实例对桥梁在各种情况下抗倾覆性能的变化规律及影响因素进行了分析。主要研究工作如下:①对国内外规范(国内公路、市政规范、美国AASHTO规范以及英国BS 5400规范等)中关于抗倾覆验算的相关规定进行了分析,讨论了国内外规范对梁桥抗倾覆规定的发展历程,计算比较了各规范中相关验算荷载的水平,探讨了基于相关规范设计荷载的抗倾覆计算安全性差异。②分析了相关弯梁桥的受力特点,指出了影响桥梁抗倾覆能力的主要参数,包括桥梁的曲率半径、桥梁跨数、支座布置形式等;讨论了抗倾覆验算时倾覆轴的选取原则;参考规范中抗倾覆验算公式,解析出桥梁各参数变化下的抗倾覆系数相关关系,并借助MATLAB编程,研究了桥梁各参数改变对桥梁抗倾覆能力的影响规律,并进行了实桥算例的验证分析。③借助于Midas/Civil有限元分析软件,建立基于工程实例的不同参数值下的梁格法模型,分析了曲率半径、桥梁跨数等参数值改变时桥梁抗倾覆能力的变化过程,对桥梁抗倾覆设计及在役桥梁抗倾覆加固提供了参考和借鉴。④基于本文的理论研究与实例分析结果,总结了提高新建桥梁抗倾覆性的设计理念、设计措施及施工注意事项,分析归纳了在役桥梁抗倾覆加固的技术原理及适用性,并进行了实例分析。
[Abstract]:With the continuous development of traffic in China, by end of 2014, 757,100 bridges have been built in China, which have reached the leading level in the world. The bridges not only make it possible for roads to cross rivers, lakes and seas, but also facilitate the interchange of urban roads. Among the bridges built in our country, box-girder bridges are widely used. The main characteristics of these bridges are their large torsional stiffness, beautiful appearance, smooth lines and good visual effect. It is very suitable for urban viaducts or intercommunication ramps located on small radius curves. However, in recent years, there have been many bridge accidents, many transversal overturning accidents of box girder bridges have caused great social repercussions. More and more engineers and scholars begin to analyze the cause of the accident and hope to prevent the accident from happening again to the maximum extent. This paper introduces the development of box girder bridge and the research status of anti-overturning bridge in recent years. This paper analyzes the relevant regulations of the domestic and foreign codes, and analyzes the changing rules and influencing factors of the anti-overturning performance of bridges under various conditions with the aid of engineering examples. The main research work is as follows: 1, the domestic and foreign codes (domestic highway, municipal code, municipal code, etc.). This paper analyzes the relevant provisions of the American AASHTO Code and the British BS5400 Code, discusses the development history of the anti-overturning provisions of the domestic and foreign codes, and calculates and compares the levels of the relevant checking loads in the codes. This paper discusses the safety difference of overturning calculation based on the design load of relevant code. 2. The stress characteristics of the bridge are analyzed, and the main parameters affecting the capsizing ability of the bridge are pointed out, including the curvature radius of the bridge and the span number of the bridge. This paper discusses the selection principle of overturning shaft in anti-overturning checking calculation, the formula of anti-overturning checking calculation in reference code, analyzes the correlation relation of anti-overturning coefficient under the change of bridge parameters, and makes use of MATLAB programming. In this paper, the influence of the bridge parameters on the capsize resistance of the bridge is studied, and the verification and analysis of real bridge examples are carried out. 3. With the help of Midas/Civil finite element analysis software, the beam method model based on the different parameter values of the engineering example is established. The changing process of the anti-overturning ability of the bridge when the curvature radius and the span number of the bridge are changed is analyzed, which provides a reference for the anti-overturning design of the bridge and the anti-overturning reinforcement of the in-service bridge. 4. Based on the theoretical research and the analysis result of the example, the paper provides a reference for the anti-overturning design of the bridge. This paper summarizes the design concept, design measures and construction precautions for improving the anti-overturning resistance of new bridges, analyzes and summarizes the technical principle and applicability of anti-overturning reinforcement of bridges in service, and makes an example analysis.
【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;U448.213

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