Optimal Durability Design Of Concrete Structures Based On Genetic Algorithm In Marine Environment

Due to the characteristics of the concrete raw materials and the use of the environment,it is determined that the durability of the concrete structure can't be avoided,causing serious raw material loss and economic loss to our country.The energy,resources and environmental protection problems are becoming more and more serious.The durability of concrete structures is a major concern in today's engineering field.It is not only related to the control of concrete structure maintenance and reconstruction costs,but also closely related to energy conservation and emission reduction,environmental protection and social sustainable development.In this paper,a new crossover operator and mutation operator are designed,and a new adaptive genetic algorithm is proposed.Through the secondary development of MATLAB software,the algorithm is applied to the durability design of concrete structure in marine environment.The optimal mix ratio of concrete was obtained,and the life ratio and cost analysis were carried out for the optimized concrete mix ratio.The main contents of this paper are as follows:1.This paper introduces the basic concepts,terminology,basic theory and operation steps of traditional genetic algorithm,and analyzes the advantages and disadvantages of the algorithm.The coding and implementation of traditional genetic algorithms are harder and easier to set up.Aiming at the shortcomings of the original genetic algorithm,this paper proposes a new adaptive genetic algorithm.The algorithm can adaptively select the control parameters and avoid the irrationality of parameter selection.At the same time,the algorithm avoids the problem of local optimal solution compared with the general adaptive genetic algorithm.By using MATLAB software to program,with three characteristic test function to detect the effectiveness and feasibility of the algorithm,the results show that the algorithm is practical.2.This paper analyzes the influencing factors of the durability of concrete in marine environment,studies the transport theory of chloride ion in concrete and the protective measures of corrosion of steel bar.The improved adaptive genetic algorithm is applied to the mathematical model of durability optimization by MATLAB.Compared with the optimized results of the traditional genetic algorithm,the optimization effect of the algorithm is better and the cost is lower.3.The life and cost prediction of the optimized concrete mix ratio is analyzed.The results show that the optimization results meet the design life and the cost is low.In this paper,the improved adaptive genetic algorithm is used to optimize the durability design of the concrete structure in the marine environment.It can save the construction cost under the premise of satisfying the durability service life,and can also provide the theoretical basis for the concrete durability design specification.The improved adaptive genetic algorithm proposed in this paper can be used to optimize the durability of other environmental conditions,but also can be used to optimize the structural design of civil engineering.