铁路桥梁健康状态评估技术研究

发布时间：2018-02-02 02:54

本文关键词： 铁路桥梁现场调查健康监测系统健康状态评估　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：铁路是国家交通运输网的重要组成部分,是国民经济的生命线,而铁路桥梁作为铁路干线上的节点工程,是铁路建设的核心部分所在,在促进国民经济的发展中扮演着极其重要的角色。快速评估铁路桥梁在运营状态下的健康状态对于保障行车安全和提升社会效益,则具有重要的现实意义。本文研究铁路桥梁运营状态下的健康状态评估,主要开展了以下工作:首先,分析了我国铁路桥梁存在的安全隐患,说明了铁路桥梁对于保障行车安全的重要性。介绍了桥梁状态评估的内容和方法。通过分析,选用分层综合评估法来评估铁路桥梁运营状态下的健康状态,并以二元比较法计算铁路桥梁结构层次中各层指标的权重。其次,在分析铁路桥梁最新评估规范的基础上,结合铁路桥梁的结构特点和发展趋势,按行车速度的不同,将铁路桥梁分为普通铁路桥梁和高速铁路桥梁两大块,并建立了各自桥型的健康状态评估指标体系。其中,普通铁路桥梁包括钢板梁桥、钢桁梁桥、混凝土梁式桥、上承式混凝土拱式桥、中(下)承式混凝土拱式桥、连续刚构桥、斜腿刚构桥、钢斜拉桥、钢悬索桥;高速铁路桥梁分为预应力混凝土梁式桥、预应力混凝土连续刚构桥、钢板梁桥、上承式混凝土拱式桥、系杆拱桥、钢桁拱桥和钢斜拉桥。再次,在研究基于现场调查的铁路桥梁健康状态评估中,编制了相应的铁路桥梁损伤病害现场调查表,并制定了相应等级的评定描述;在研究基于健康监测系统的铁路桥梁健康状态评估中,结合物元可拓评估法和概率论与数理统计中相关知识,实现了各评估指标体系中底层评估指标健康等级的评定和扣分,并首次以打分的形式对铁路桥梁的健康状态进行了评估。最后,提出以桥梁健康指数(BHI)来表征铁路桥梁的健康状态,并给出了相应的状态评估公式。结合武汉长江大桥实测数据,详细介绍了如何进行基于现场调查的铁路桥梁健康状态评估和基于健康监测系统的铁路桥梁健康状态评估。
[Abstract]:Railway is an important part of the national transportation network and the lifeline of the national economy, and the railway bridge, as the node engineering on the railway trunk line, is the core part of the railway construction. It plays an extremely important role in promoting the development of national economy. Rapid evaluation of the health of railway bridges in the operational state is important to ensure the safety of driving and enhance social benefits. This paper studies the evaluation of the health status of railway bridges under the state of operation, mainly carries out the following work: first, analyzes the existing safety risks of railway bridges in China. This paper explains the importance of railway bridges in ensuring the safety of railway operation, introduces the contents and methods of bridge state evaluation, and selects the stratified comprehensive evaluation method to evaluate the health status of railway bridges under the condition of operation. And the binary comparison method is used to calculate the weight of each layer index in the railway bridge structure level. Secondly, based on the analysis of the latest evaluation norms of railway bridge, combined with the structural characteristics and development trend of railway bridge. According to the different driving speed, the railway bridge is divided into two parts: the ordinary railway bridge and the high-speed railway bridge, and the health evaluation index system of each bridge type is established. Among them, the ordinary railway bridge includes steel plate girder bridge. Steel truss bridge, concrete beam bridge, upper bearing concrete arch bridge, middle (lower) bearing concrete arch bridge, continuous rigid frame bridge, oblique leg rigid frame bridge, steel cable-stayed bridge, steel suspension bridge; High-speed railway bridges are divided into prestressed concrete beam bridge, prestressed concrete continuous rigid frame bridge, steel plate beam bridge, overbearing concrete arch bridge, tied arch bridge, steel truss arch bridge and steel cable-stayed bridge. In the study of railway bridge health assessment based on field investigation, the corresponding field questionnaire of railway bridge injury disease is compiled, and the evaluation description of the corresponding grade is made. In the study of railway bridge health state evaluation based on health monitoring system, combined with matter-element extension evaluation method and probability theory and mathematical statistics related knowledge. The evaluation and deduction of the health grade of the bottom evaluation index are realized in each evaluation index system, and the health status of the railway bridge is evaluated for the first time in the form of scoring. Finally. In this paper, a bridge health index (BHI) is proposed to represent the health status of railway bridges, and the corresponding state evaluation formula is given, which is combined with the measured data of Wuhan Yangtze River Bridge. How to evaluate the health status of railway bridges based on field investigation and health monitoring system is introduced in detail.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

【共引文献】