不同方法加固混凝土连续梁桥上部结构试验研究

发布时间：2018-03-30 04:24

本文选题：加固　切入点：对比研究　出处：《西南交通大学》2017年硕士论文

【摘要】：随着我国道路网络建设的不停完备,老旧桥梁的存量越来越大,加上重型载重车辆的比例逐渐增多,公路荷载等级也相应的逐渐推高,旧桥加固改造升级的任务越来越重。经过我国公路桥梁加固改造工程多年的经验积累和技术发展,若干加固技术日渐成熟并被广泛应用于工程实践中,这些针对桥梁结构的快速有效的加固手段为国民经济的顺畅运行提供了保障。近年来,日益沉重的交通流量,对桥梁结构加固提出了快速完成、效果显著的新要求,这就要求工程人员对加固方法进行横向比对,明确不同加固方法的长短。目前为止,这些加固方法,其比较研究大多处于室内阶段。在实际桥梁上,不同加固方法的效果如何,能否适应快速高效的加固新要求,这些问题影响着众多旧桥加固工程的关键决策。因此,对于实际桥梁进行试验,更直观的比较研究各种加固方法的加固效果,是有一定的必要性的。针对以上情况,本文依托青龙场立交桥加固工程,开展了以下工作:(1)简述了国内外公路桥梁加固方法的研究状况以及桥梁工程的加固原则和加固目标,阐述了本课题利用模型计算和荷载试验进行比对的研究方法。(2)分别讨论了本课题中涉及到的"增大截面法"、"粘贴钢板法"、"粘贴碳纤维布法"、"预应力碳纤维板法"等四种桥梁加固方法,针对每种方法分析了其加固原理、施工技术以及加固计算方法。(3)结合本课题所依托的青龙场立交加固工程,详细阐述了各加固方法的试验布置,对每种方法进行了加固量介绍以及加固效果计算,并明确了荷载试验的各项工作安排。(4)详细介绍了荷载试验的整个过程,按照试验计划对青龙场立交桥试验跨进行了全面的数据采集和分析,并进一步结合结构的相关计算,针对四种不同方法,进行了比较研究,分析比较了各自的加固效果且得到了相应的结论。
[Abstract]:With the continuous completion of road network construction in our country, the stock of old bridges is increasing, and the proportion of heavy-duty vehicles is increasing gradually. The task of strengthening and upgrading old bridges is becoming more and more serious. After many years of experience accumulation and technical development of highway bridge reinforcement and renovation projects in China, some reinforcement technologies are becoming more and more mature and widely used in engineering practice. These quick and effective reinforcement methods for bridge structure provide a guarantee for the smooth operation of national economy. In recent years, the increasingly heavy traffic flow has put forward a new requirement for the bridge structure reinforcement to be completed quickly and with remarkable effect. So far, most of the comparative studies on these reinforcement methods are in the indoor stage. On the actual bridge, what are the effects of different reinforcement methods? These problems affect the key decision of many old bridge reinforcement projects. Therefore, it is more intuitionistic to compare and study the reinforcement effect of various reinforcement methods for the actual bridge. In view of the above situation, this paper, relying on the strengthening project of Azure Dragon's Changchang overpass, has carried out the following work: 1) briefly describing the research status of highway and bridge reinforcement methods at home and abroad, as well as the reinforcement principles and objectives of the bridge engineering. In this paper, the research methods of model calculation and load test comparison are expounded. The "enlarged section method", "sticking steel plate method", "bonded carbon fiber collocation method" and "prestressed carbon fiber slab method" are discussed respectively. Four kinds of bridge strengthening methods, According to each method, this paper analyzes its reinforcement principle, construction technology and reinforcement calculation method. This paper introduces the reinforcement amount of each method and the calculation of the reinforcement effect, and clarifies the working arrangement of the load test, and introduces the whole process of the load test in detail. According to the experimental plan, the comprehensive data collection and analysis of the test span of Azure Dragon's field overpass are carried out, and further, combining with the relevant calculation of the structure, four different methods are compared and studied. The effects of reinforcement are analyzed and compared and the corresponding conclusions are obtained.
【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】：U445.72

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