钢绞线斜拉索锚固系统耐久性试验研究

发布时间：2018-05-01 09:12

本文选题：斜拉索 + 大气腐蚀　；参考：《重庆交通大学》2015年硕士论文

【摘要】：进几十年来,斜拉桥因为其良好的技术经济指标和美学价值在现代桥梁结构中占据着重要的地位,但作为斜拉桥的生命索—斜拉索的耐久性却不容乐观:其实际使用寿命远远低于设计使用寿命,这给社会经济带来了沉重的负担。这使得研究斜拉索及其锚固体系在大气环境中的腐蚀行为成为必要课题。但大气暴露试验周期长、影响因素多,所以研究模拟自然环境的试验室加速腐蚀的试验方法,通过研究试验室加速腐蚀试验来预测斜拉索大气腐蚀行为是一个非常有价值的研究方向。围绕这个研究主题,本文的主要研究内容如下:①简要回顾了斜拉桥的发展历程,对斜拉桥斜拉索部分主要病害进行了总结和原因分析。并总结了研究斜拉索耐久性的国内外研究现状,简要介绍了本文的研究背景及研究内容。②介绍了金属的环境腐蚀试验的两种试验方法,并对其中的试验室加速腐蚀试验研究状况进行了四个案例介绍,总结了其试验方法并进行了评价。由此分析出大气环境中影响斜拉索及锚固体系耐久性的环境影响因子。通过对四个案例试验方法和腐蚀因子的总结,确定本试验所采用试验方法及环境因子,并总结了试验室加速腐蚀试验的评价方法,确定了本试验所采取的评价方法。③介绍了本次试验所设计的斜拉索及锚固系统耐久性试验装置、多因子循环复合腐蚀试验方法及原理,介绍了试验所应用的设备及材料。④介绍试验过程,分析镀锌钢绞线、全裸钢绞线、环氧树脂钢绞线和锚具的腐蚀外观形貌,对比防护效果,分析其腐蚀原理,运用图表法将试验钢绞线的腐蚀速率与户外大气暴露腐蚀数据对比,评价试验与大气环境试验相关性;运用灰色关联分析、加速性评价方法进行定量分析。评价多因子循环复合腐蚀试验与大气暴露试验加速性。⑤对本文的研究工作做了总结,给出一些研究中得出的结论,指出研究中还存在的不足,对接下来的研究内容做了一些期许。
[Abstract]:In recent decades, cable-stayed bridges have played an important role in modern bridge structures because of their good technical and economic indicators and aesthetic values. But the durability of the life cable-stay cable as a cable-stayed bridge is not optimistic: its actual service life is far lower than the design service life, which brings a heavy burden to the social economy. This makes it necessary to study the corrosion behavior of cable and its anchoring system in atmospheric environment. However, the period of atmospheric exposure test is long and there are many influencing factors, so the accelerated corrosion test method of laboratory simulating natural environment is studied. It is a valuable research direction to predict atmospheric corrosion behavior of stay cables by laboratory accelerated corrosion test. The main research contents of this paper are as follows: 1. The development history of cable-stayed bridge is briefly reviewed, and the main diseases of cable-stayed bridge are summarized and the causes are analyzed. The present situation of research on the durability of stay cables at home and abroad is summarized. The research background and research content of this paper are briefly introduced. 2. Two kinds of test methods for environmental corrosion test of metals are introduced. Four cases of accelerated corrosion test in laboratory were introduced, and the test methods were summarized and evaluated. The environmental factors affecting the durability of cable and Anchorage system in atmospheric environment are analyzed. Through the summary of four case tests and corrosion factors, the test methods and environmental factors used in this test are determined, and the evaluation methods of accelerated corrosion tests in the laboratory are summarized. The evaluation method of this test is determined. 3. The durability test equipment of stay cable and anchoring system, the test method and principle of multifactor cyclic composite corrosion are introduced. The test process of equipment and material used in the test is introduced. The corrosion appearance of galvanized steel strand, bare steel strand, epoxy resin steel strand and anchor is analyzed, and the corrosion principle is analyzed by comparing the protective effect. The corrosion rate of the test wire is compared with the corrosion data of outdoor atmospheric exposure by using the chart method, and the correlation between the test and the atmospheric environmental test is evaluated, and the quantitative analysis is carried out by using the grey correlation analysis and the accelerated evaluation method. This paper summarizes the research work of this paper by evaluating the acceleration of multifactor cyclic combined corrosion test and atmospheric exposure test, and points out some conclusions of the research, and points out the shortcomings in the study. Some expectations are made for the following research.
【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】：U446

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