Abstract
In this study on concrete durability under a single environment, considering the meteorological data to determine the environmental correction coefficient, the computational model of concrete ultimate durability life under one environment is improved. Damage is defined as the ratio of service life to ultimate durability life, and it specifies the failure of concrete structures when the damage comes to 0.8. The Analytic Hierarchy Process (AHP) is modified by replacing the conventional fuzzy scale to the priority of every single environment determined by the ultimate durability life span of each environment. The weight of every environment is settled by modified AHP and is used to improve Miner linear cumulative criteria. Then, the computational model of concrete ultimate durability life under a complex environment based on damage is established, the applicability of which is verified by comparing the prediction results and field data in Tianjin and Yantai ports. This paper also improves set pair analysis by dividing the stability range with comprehensive index connectivity, and then, the evaluation of levels of concrete durability stabilization is developed.
Highlights
The importance of research on concrete durability has been confirmed by engineering practice
There is a huge difference in the major erosion and the degree of erosion in durability between different environments, and the deterioration of durability in engineering practice is caused by multiple erosion effects
The specified damage 0.8 symbolizes the failure of concrete durability, which improves the analytic hierarchy process (AHP) and transforms the traditional comparative fuzzy scale into the order of the durability life of concrete under a single attack derived from the on-site environment, thereby perfecting the order of importance in the objective sense, and the relationship between damage and service life of concrete is established to predict the durability life of concrete
Summary
The importance of research on concrete durability has been confirmed by engineering practice. There is an urgent need to determine the main erosion effects of concrete durability to establish an evaluation model which considers environmental factors, and with the connection between laboratory standard data and engineering data, the durability life of concrete is obtained. The research on the durability evaluation of concrete in a complex attack environment is difficult because of the following reasons: The mechanism of concrete durability degradation under multi-erosion is not a superposition of the degradation mechanism under a single attack, and the importance of each environmental effect and its coupling are difficult to consider. The specified damage 0.8 symbolizes the failure of concrete durability, which improves the analytic hierarchy process (AHP) and transforms the traditional comparative fuzzy scale into the order of the durability life of concrete under a single attack derived from the on-site environment, thereby perfecting the order of importance in the objective sense, and the relationship between damage and service life of concrete is established to predict the durability life of concrete. The improved set pair analysis method is used to evaluate the durability grade of concrete, in order to predict the residual durability life of in-service concrete in engineering scale
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