Static And Dynamic Analysis And Reliability Study Of Pavement Structure Based On Fuzzy Theory

With the deepening of research on uncertainty and randomness of asphalt pavement structure design by experts and scholars at home and abroad.The reliability design method of asphalt pavement structure has been gradually formed.But in order to find a reasonable and effective reliability design method.It is necessary to consider not only the randomness of materials,but also the fuzziness of structural reliability.In order to solve this problem.The static and dynamic finite element analysis of pavement structure and fuzzy mathematics theory are taken as the research basis in this paper.The transversely isotropic pavement structure is taken as the research object,and fuzzy finite element analysis is carried out.And aiming at the fuzzy reliability analysis of asphalt pavement structure.The following work is mainly done:(1)Combining the static finite element method and fuzzy mathematics theory of pavement structure,the fuzzy static finite element analysis method of pavement structure is summarized.Considering the fuzziness of material properties and load of pavement structure,a fuzzy equilibrium equation of pavement structure is established.Solving the solution of the equation by the interval number decomposition method,and verified by the relevant examples.(2)Based on the dynamic finite element of pavement structure,fuzzy dynamic finite element analysis model of pavement structure and fuzzy dynamic finite element governing equation of pavement structure are established by introducing the theory of fuzzy mathematics.The solution of fuzzy dynamic equilibrium equation is discussed by using Wilson-? method,interval number decomposition theorem and ANSYS finite element simulation,and through the relevant examples to verify.(3)Asphalt pavement is used as the research object,Fuzzy mathematics theory is applied to the reliability analysis of asphalt pavement structure.From the point of view of limit function,taking road surface deflection as control index,the formula of fuzzy reliability of asphalt pavement structure is derived.Based on that,combined with the two grade asphalt section of Xixian new area,the relevant numerical analysis is carried out.The results of the study show that: adopting the basic theory of fuzzy mathematics,based on the finite element method of pavement structure.The fuzzy finite element analysis of pavement structure is carried out.The result is obviously superior to that of the general finite element analysis.Owing to considering the influence of various fuzzy factors in practical engineering,then lead to the result is more practical.In the process of combining fuzzy mathematics theory with reliability,we can see that fuzzy reliability is superior to traditional reliability and the practical engineering significance of fuzzy reliability.It provides a theoretical basis for future research on fuzzy theory of pavement structure.