基于荷载试验的跨铁路城市桥梁结构安全性评定研究

发布时间：2018-03-14 14:42

本文选题：荷载试验　切入点：桥梁检测　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：在桥梁结构中,因其具有结构刚度大,建造方式先进,造型结构美观等特点,连续梁常作为城市上跨铁路的常用桥型。中国作为高速铁路领域内的后起之秀,近年来国内高速铁路迎来了高速的发展时期,因铁路运输具有运输快捷、运量大、运输安全地特点,实现了整体跨越式发展。需要指出的是,铁路速度的提升对于铁路安全提出了更加严格的要求。然而当铁路线路靠接城市边缘时,常与城市道路发生交叉。通常当其他结构与高速铁路发生交叉时,优先选择的跨越方案为下穿式,当条件不允许时可选上跨的方式。上跨结构常采用上跨高速铁路的桥梁结构,因此上跨的桥梁结构安全性将直接影响到下穿高速铁路结构的安全,进而影响到整个高铁系统的行车安全。本文从安全性角度出发,阐述了上跨高铁的城市桥梁结构安全性评定内容方法等。本文的主要工作内容如下:(1)详细介绍了桥梁评定的国内外的发展现状,指出了桥梁检测评定工作是桥梁工作者必须要加以重视的一项工作内容。(2)介绍了桥梁检测评定所需计算的理论基础。针对常见的多跨预应力混凝土连续箱梁的结构,详细介绍了该类桥型的构造特点,并针对跨铁路的连续箱梁桥自身的特殊性进行了阐述。然后对检测评定计算所需的有限元方法进行了阐述。(3)对于桥梁的检测评定工作,其主要内容是对待检桥梁的现场检测、静载动载试验。本文对上述的三项内容进行了详细的论述。(4)依托实际工程对桥梁静动载试验的全程进行阐述,并对试验结果进行分析处理,最后对待检桥梁结构进行评价判定。
[Abstract]:In the bridge structure, because of its high stiffness, advanced construction mode and beautiful shape, continuous beam is often used as the bridge type in the city, and China is a rising star in the field of high-speed railway. In recent years, the domestic high-speed railway has ushered in a period of high-speed development. Because of the characteristics of fast transportation, large volume and safe transportation, railway transportation has realized the overall development by leaps and bounds. It should be pointed out that, The improvement of railway speed puts forward more stringent requirements for railway safety. However, when railway lines are aligned to the edge of a city, they often cross with urban roads. Usually, when other structures cross with high-speed railways, The preferred leapfrogging scheme is the underpass mode, which can be chosen when the conditions do not permit. The upper span structure often adopts the bridge structure of the upper span high speed railway. Therefore, the safety of the bridge structure of the upper span will directly affect the safety of the structure of the underpass high-speed railway, and then affect the safety of the whole high-speed railway system. In this paper, the methods of safety assessment of urban bridge structures are described. The main work of this paper is as follows: (1) the development status of bridge assessment at home and abroad is introduced in detail. It is pointed out that bridge inspection and evaluation is a work that must be paid attention to by bridge workers. The theoretical basis of calculation for bridge inspection and evaluation is introduced. The common multi-span prestressed concrete continuous box girder structure is introduced. The structural characteristics of this kind of bridge are introduced in detail, and the particularity of continuous box girder bridge across railway is expounded. The main content of this paper is the field test and static load test of the bridge to be inspected. This paper discusses the above three contents in detail. (4) based on the actual engineering, the whole course of the bridge static and dynamic load test is expounded. The test results are analyzed and processed. Finally, the bridge structure is evaluated and judged.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U447

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