在役钢管混凝土拱桥检测技术及可靠性评价方法研究

发布时间：2018-07-08 19:03

本文选题：钢管混凝土拱桥 + 检测技术　；参考：《郑州大学》2015年硕士论文

【摘要】：桥梁工程作为交通运输的咽喉工程,在国民经济和人民生活中发挥着重要作用。钢管混凝土拱桥以优美的外观和合理的结构形式在我国得到广泛应用,然而目前在役的钢管混凝土拱桥很多已经进入病险期,出现了不同程度的老化、破损现象,已经严重影响桥梁的正常使用。因此,对在役钢管混凝土拱桥进行检测与可靠性评价,为相关部门制定科学的决策提供依据,具有十分重要的意义。本文在前人研究成果基础上,结合钢管混凝土拱桥结构特点对在役钢管混凝土拱桥可靠性进行了较为系统的研究,主要成果如下:(1)分析总结了桥梁检测的常用方法,主要以某下承式钢管混凝土吊杆拱桥为背景,介绍了钢管混凝土吊杆拱桥的主要检测流程和注意事项,得到以下结论:1通过检查,除发现个别构件存在少量影响结构耐久性病害情况(局部渗水、裂缝及混凝土破损)以外,未见其他明显结构性缺陷,桥梁整体稳定。2非破损试验检测结果表明,该桥结构材料实际性能满足设计要求,并且,现阶段外界环境的侵蚀对构件性能的影响不大。3除了一般的常规检查外,针对该钢管混凝土拱桥的专项检测结果表明,该桥拱轴线线形良好,拱肋整体结构性能稳定,但吊杆下锚头渗水、锈蚀较严重,应尽快进行处理。(2)根据在役钢管混凝土拱桥的结构形式,对影响结构可靠性的主要因素进行分析,建立了钢管混凝土拱桥的拱肋、吊杆及横梁的极限状态方程,并以吊杆及拱肋可靠性的计算为例进行了应用研究。(3)根据钢管混凝土拱桥的结构形式建立了具有四层结构的钢管混凝土拱桥可靠性评价体系,并讨论了评价体系中底层指标的等级评判标准,引入三角隶属函数作为底层指标的隶属函数,利用模糊理论对底层指标的评分进行模糊化处理,提出了基于层次分析的在役钢管混凝土拱桥可靠性模糊综合评价方法。(4)以某钢管混凝土拱桥健康监测系统为例简单介绍了桥梁健康监测系统的基本内容、构成及工作流程。
[Abstract]:Bridge engineering, as a throat project of transportation, plays an important role in national economy and people's life. Concrete-filled steel tubular (CFST) arch bridges are widely used in China with beautiful appearance and reasonable structure. However, at present, many CFST arch bridges in service have entered the period of danger of illness, and have appeared the phenomenon of aging and breakage to varying degrees. It has seriously affected the normal use of the bridge. Therefore, it is of great significance to test and evaluate the reliability of concrete-filled steel tubular arch bridges in service, which can provide scientific basis for relevant departments to make scientific decisions. In this paper, based on the previous research results, combined with the structural characteristics of concrete-filled steel tubular arch bridge, the reliability of in-service concrete-filled steel tubular arch bridge is studied systematically. The main results are as follows: (1) the common methods of bridge detection are analyzed and summarized. Taking a through concrete filled steel tube suspension arch bridge as the background, this paper introduces the main inspection flow and matters needing attention of the concrete filled steel tube suspension arch bridge, and obtains the following conclusions: 1. Except that there are a few structural defects (local seepage, crack and concrete breakage) affecting the durability of the bridge, there are no obvious structural defects. The test results of the whole stability of the bridge show that the whole stability of the bridge is 2. 2. The actual performance of the structure material of the bridge meets the design requirements. Moreover, at present, the external environment erosion has little effect on the performance of the members. The arch axis of the bridge is good, and the overall structure of the arch rib is stable, but the water seepage and corrosion at the anchor head of the suspender are serious, which should be dealt with as soon as possible. (2) according to the structure form of the concrete filled steel tube arch bridge in service, Based on the analysis of the main factors affecting the reliability of the structure, the ultimate state equations of arch ribs, suspenders and beams of concrete-filled steel tubular arch bridges are established. The reliability calculation of suspenders and arch ribs is taken as an example. (3) according to the structure form of CFST arch bridge, the reliability evaluation system of CFST arch bridge with four-story structure is established. In this paper, the evaluation standard of the bottom index in the evaluation system is discussed. The triangular membership function is introduced as the membership function of the bottom index, and the score of the bottom index is treated by fuzzy theory. This paper presents a fuzzy comprehensive evaluation method for reliability of concrete-filled steel tubular arch bridges in service based on AHP. (4) taking a concrete filled steel tube arch bridge health monitoring system as an example, the basic contents, composition and work flow of the health monitoring system are briefly introduced.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.22;U446

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