基于模糊理论的公路混凝土耐久性评估

发布时间：2018-11-27 11:58

【摘要】：长久以来,混凝土都被视为一种耐久的材料。然而,现实却是大量的混凝土结构在投入使用一段时间后就出现了因耐久性退化而造成的结构破坏。与一般建筑物相比,公路的服役环境更为恶劣,而且还承受着车辆荷载作用。在各劣化因素耦合作用下,包括公路在内的许多混凝土结构未达到设计年限便提前破坏。耐久性破坏所造成的损失是巨大的,这使得人们逐渐开始重视混凝土结构的耐久性问题。本文对公路混凝土结构的耐久性评估展开研究,提出了基于全寿命理论的公路混凝土结构耐久性模糊评估方法,并以工程实例进行了验证。主要进行了如下研究:1.分析了一般情况下造成混凝土结构耐久性劣化的原因。结合公路的技术特点,分析劣化因素对公路混凝土耐久性的影响。2.阐述了目前的一些评估方法。重点介绍了模糊综合评判法,并介绍了该方法进行耐久性评估时的步骤及存在的不足。针对不足,引入全寿命理论,把影响混凝土结构耐久性的因素分为促进、衰退两方面,提出了一种基于全寿命理论的混凝土结构耐久性模糊评估方法。3.根据促进因素及衰退因素,建立公路混凝土结构耐久性评估的指标体系,参考现行规范及相关研究成果,确定评价指标的分级标准。同时,在进行因素权重划分时,本文采用了网络层次分析法。4.根据本文确定的评估方法对一实际工程进行评价分析。通过计算结果与现实情况对比,检验该方法的有效性。本文建立了基于全寿命理论的公路混凝土结构耐久性的模糊评价体系,进一步完善和补充了混凝土结构耐久性评估方面的研究,可以为结构的维修、加固提供理论依据,也可以反馈信息给设计、施工等部门,积累和总结工程经验。同时,该方法还可应用于其他混凝土结构的耐久性评估。
[Abstract]:Concrete has long been regarded as a durable material. However, the reality is that a large number of concrete structures have been damaged by durability degradation after being put into use for a period of time. Compared with the general buildings, the service environment of the highway is worse, and it also bears the effect of vehicle load. Under the coupling of various deterioration factors, many concrete structures, including highways, are destroyed in advance without reaching the design time. The damage caused by durability damage is huge, which makes people pay more attention to the durability of concrete structure. In this paper, the durability evaluation of highway concrete structure is studied, and a fuzzy evaluation method of highway concrete structure durability based on the whole life theory is put forward, which is verified by an engineering example. The main research is as follows: 1. The causes of durability deterioration of concrete structures under general conditions are analyzed. Combined with the technical characteristics of highway, the influence of deterioration factors on the durability of highway concrete is analyzed. 2. Some current evaluation methods are described. This paper mainly introduces the fuzzy comprehensive evaluation method, and introduces the steps and shortcomings of the method in durability evaluation. In view of the deficiency, this paper introduces the theory of whole life, divides the factors that affect the durability of concrete structure into two aspects: promotion and decline, and puts forward a fuzzy evaluation method of durability of concrete structure based on the theory of whole life. According to the factors of promotion and decline, the index system of durability evaluation of highway concrete structure is established, and the classification standard of evaluation index is determined by referring to the current norms and related research results. At the same time, in the division of factor weights, this paper uses the network analytic hierarchy process. 4. 4. According to the evaluation method determined in this paper, an actual project is evaluated and analyzed. The validity of the method is verified by comparing the calculation results with the actual situation. In this paper, a fuzzy evaluation system for durability of highway concrete structures based on the whole life theory is established, and the research on durability evaluation of concrete structures is further perfected and supplemented, which can provide a theoretical basis for the maintenance and reinforcement of concrete structures. Can also feedback information to design, construction and other departments, accumulated and summed up engineering experience. At the same time, the method can be used to evaluate the durability of other concrete structures.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

【参考文献】