Structural optimization design of mobile flood wall based on improved genetic algorithm

Abstract

With the rapid development of human society, urban waterlogging is more and more serious, a flood control facility with convenient transportation and quick installation is urgently needed in the city’s development, which makes the mobile flood wall came into being. The research on mobile flood wall at home and abroad mainly focuses on the analysis of mechanical properties and anti-seepage ability, but in order to improve the utilization rate of material strength and make it more economical, the structure optimization of flood wall is also very important. In this paper, the structural form and the basic parameters of the mobile flood wall are introduced. The finite element model of the mobile flood wall is established and the numerical simulation is carried out on the basis of the constitutive relation. The sample space is obtained by the response value analysis through numerical simulation and the structural parameters are optimized based on the genetic algorithm. In this paper, there are two types of numerical simulation analysis: diagonal bracing and non-diagonal bracing. The simulation analysis shows that the maximum stress of the diagonal bracing is 15. 4MPa, which is less than that of the without diagonal bracing (57. 6MPa), and the maximum displacement of the diagonal bracing is 0.4mm, which is far less than that of the without diagonal bracing (3. 18mm). Both of them meet the safety requirements of the mobile flood wall that the stress δ≤110MPa, the deflection of the main component γ ≤L /250, and the deflection of the baffle γ ≤ L /200.On the basis of numerical simulation, the function constraints of stress, deflection and cost are set by genetic algorithm to optimize the structure. According to the results of numerical analysis, no matter in the column or baffle, the Y-direction displacement value of the form with diagonal bracing is small, and the Y-direction displacement with diagonal bracing baffle is progressive to both sides, which is easier to control in the practical engineering. The analysis shows that the form with the diagonal bracing is far better than that without the diagonal bracing. In the case of the diagonal bracing, the optimization results show that when the height of flood control wall column is 1.0m-1.6m, the span length of baffle is required to be 2.15m-1.91m, which can meet the safety requirements and economic needs, and the optimization scheme is provided for the parameter design and structure design of actual engineering.