基于可變模糊集理論的寒旱地區(qū)在役混凝土橋梁耐久性評(píng)估
[Abstract]:In the course of the use of concrete bridges, it often causes the bridge to fail in advance because of the durability problem. There are many factors affecting the durability of the bridge, such as the working environment, the traffic volume and the defects of its own materials. In these factors, the working environment will make the durability of the concrete bridges vary in different regions because of the region. There are more complex environmental conditions and harsh climate conditions in the area of cold and dry areas, and the durability problems of the bridge structures in the area are more serious. Once the durability damage occurs in the service concrete bridges, it will not only seriously impede the smooth operation of the traffic system, but even give the national economy and the people's property safety. Therefore, there is an immeasurable loss. Therefore, it is urgent to solve the durability of the concrete bridges in the cold and drought areas, and the key to solve the problem is to reasonably evaluate the durability of the bridge. In this paper, the durability of the active concrete bridges in the cold and dry areas is the research object, and the relevant theory of the durability of the concrete bridges in service is related to the theory related to the durability of the concrete bridges in service. Knowledge, combined with the characteristics of the durability of bridges in cold and dry areas, deeply analyzes the factors affecting its durability, and follows the principle of establishing the evaluation index system, and constructs the durability evaluation index system of the existing concrete bridges in the cold and dry areas. The durability evaluation grade of the active concrete bridge in the cold and dry areas and the judgement grade of each evaluation index are determined. On the basis of the method of determining the weight of the evaluation index and the comparison and analysis of the comprehensive evaluation method, the fuzzy variable set theory is established on the basis of the construction of the construction of the durability evaluation index system of the existing concrete bridges in the cold and dry areas. The concrete bridge durability assessment model in the cold and drought area, and the concrete steps of the model application are expounded in detail. In this model, the evaluation index weight is determined by the analytic hierarchy process (AHP), and the variable fuzzy set theory is introduced to comprehensive evaluation, and the durability evaluation of the concrete bridges in the cold and dry areas is completed by the new combination method. The analytic hierarchy process (AHP) can combine the qualitative analysis with the quantitative analysis to obtain more accurate results of weight calculation. Variable fuzzy set theory can flexibly determine the evaluation interval under different types of evaluation index for solving the complex problem of the index system, and make the quantitative index real. The evaluation results are used to make the evaluation result more objective. Through concrete engineering examples, the feasibility and effectiveness of building durability evaluation model of concrete bridges in cold and dry areas based on fuzzy variable set theory are verified. It is completely feasible to evaluate the durability of the bridge. The evaluation results can reflect the durability of the bridge, and help to take corresponding remedial measures to solve the durability problem and ensure the safe use of the bridge.
【學(xué)位授予單位】:蘭州交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U446;U448.33
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