海域地区混凝土桥梁耐久性评估研究
发布时间：2018-10-13 20:30
【摘要】：随着国内基础建设的高速发展,我国沿海地区修建了大量的钢筋混凝土桥梁,这些桥梁工程耗资巨大,关系到国计民生,大多需要长达百年的服役期限。然而,恶劣的海洋环境长年累月地对其进行侵蚀,导致混凝土不可避免地逐渐老化、损伤甚至破坏。当前桥梁工程的耐久性状态,引起了工程界对耐久性设计及评估的重视,但是业内对桥梁耐久性和剩余寿命的评估尚无统一认识,耐久性设计意识匮乏。因此,对混凝土结构耐久性进行研究,并以此推动工程应用具有重大意义。本文对耐久性研究课题进行整体梳理,从环境、材料、构件和结构等不同的角度入手,研究耐久性状态的损伤和评价。首先通过研究海洋环境的特点,对结构环境作用进行分类;其次分别研究了海洋环境对混凝土和钢筋材料的影响,进而对两者的损伤机理进行分析总结。在模拟材料损伤过程的同时,分析了材料损伤过程中力学性能的变化;然后研究分析了钢筋锈胀的损伤过程及破坏形态,总结了现今应用广泛的多个钢筋锈胀模型,通过算例分析对比各个模型的优缺点;重点研究了氯离子侵蚀的数学模型,对已有的经典模型进行修正,并给出了模型中各个数据的选取办法及建议值,使其能够良好地应用在桥梁耐久性状况监测中;最后,本文通过对混凝土结构耐久性准则的分析,利用剩余寿命的评定方法,建立起一套针对耐久性状况的数学评估办法。模型应用了模糊数学综合评判法,为桥梁结构建立层次清晰的评判框架,并采用了隶属函数及贴近度原则,给出了解析矩阵和评判结论。本文通过对依托工程的实例分析,对该套评判系统的应用意义进行了验证。
[Abstract]:With the rapid development of domestic infrastructure, a large number of reinforced concrete bridges have been built in the coastal areas of China. These bridges cost a lot and are related to the national economy and the people's livelihood, and most of them require a service period of up to a hundred years. However, the severe marine environment erodes it year after year, which leads to the gradual aging, damage and even destruction of concrete. At present, the durability state of bridge engineering has aroused the attention of the engineering circles to the durability design and evaluation, but there is no unified understanding of the bridge durability and residual life evaluation in the industry, and the awareness of durability design is lacking. Therefore, it is of great significance to study the durability of concrete structure and to promote engineering application. In this paper, the durability research topic is combed as a whole, and the damage and evaluation of durability state are studied from different angles of environment, materials, components and structures. Firstly, by studying the characteristics of marine environment, the effects of structural environment are classified. Secondly, the effects of marine environment on concrete and reinforced materials are studied respectively, and the damage mechanism of both is analyzed and summarized. At the same time of simulating the damage process of materials, the change of mechanical properties in the process of material damage is analyzed, and then the damage process and failure form of steel bars are studied and analyzed. The advantages and disadvantages of each model are analyzed and compared by example, the mathematical model of chloride erosion is studied emphatically, the existing classical model is modified, and the method of selecting each data and the suggested value in the model are given. Finally, through the analysis of durability criterion of concrete structure and the evaluation method of residual life, a set of mathematical evaluation method for durability condition is established. The fuzzy mathematics comprehensive evaluation method is used in the model to establish a clear hierarchy evaluation framework for bridge structure. The membership function and the principle of closeness degree are adopted, and the analytical matrix and evaluation conclusions are given. In this paper, the application significance of the evaluation system is verified by the analysis of the supporting engineering.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
本文编号：2269803
[Abstract]:With the rapid development of domestic infrastructure, a large number of reinforced concrete bridges have been built in the coastal areas of China. These bridges cost a lot and are related to the national economy and the people's livelihood, and most of them require a service period of up to a hundred years. However, the severe marine environment erodes it year after year, which leads to the gradual aging, damage and even destruction of concrete. At present, the durability state of bridge engineering has aroused the attention of the engineering circles to the durability design and evaluation, but there is no unified understanding of the bridge durability and residual life evaluation in the industry, and the awareness of durability design is lacking. Therefore, it is of great significance to study the durability of concrete structure and to promote engineering application. In this paper, the durability research topic is combed as a whole, and the damage and evaluation of durability state are studied from different angles of environment, materials, components and structures. Firstly, by studying the characteristics of marine environment, the effects of structural environment are classified. Secondly, the effects of marine environment on concrete and reinforced materials are studied respectively, and the damage mechanism of both is analyzed and summarized. At the same time of simulating the damage process of materials, the change of mechanical properties in the process of material damage is analyzed, and then the damage process and failure form of steel bars are studied and analyzed. The advantages and disadvantages of each model are analyzed and compared by example, the mathematical model of chloride erosion is studied emphatically, the existing classical model is modified, and the method of selecting each data and the suggested value in the model are given. Finally, through the analysis of durability criterion of concrete structure and the evaluation method of residual life, a set of mathematical evaluation method for durability condition is established. The fuzzy mathematics comprehensive evaluation method is used in the model to establish a clear hierarchy evaluation framework for bridge structure. The membership function and the principle of closeness degree are adopted, and the analytical matrix and evaluation conclusions are given. In this paper, the application significance of the evaluation system is verified by the analysis of the supporting engineering.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446
【参考文献】
相关期刊论文 前2条
1 吴瑾,程吉昕;海洋环境下钢筋混凝土结构耐久性评估[J];水力发电学报;2005年01期
2 朱炳喜;涵闸水上钢筋混凝土构件耐久性等级的模糊评估[J];水利水电技术;2000年07期
，本文编号：2269803
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