Optimization Research Of Buckling Restrained Brace Composite Frame Based On Genetic Algorithm

At present,in the design of buckling restrained brace BRB composite frame structure,the lateral stiffness of buckling restrained brace is calculated by determining the ratio between the buckling restrained braces and the lateral stiffness of the frame structure,and then the cross-sectional area of the core plate of the buckling restrained brace is determined.The method is used to calculate the lateral stiffness ratio of the structure,and the suitable fixed value is obtained,and then the anti lateral stiffness of the buckproof braces is calculated in a unified way.Because of the structure under earthquake action of lateral performance between different layers are different,the lateral stiffness ratio of the fixed value of BRB design to seismic response of large and small floor for adjustment,is not conducive to give full play to the energy performance of brbs.In recent years,more and more attention has been paid to the research of structure optimization by intelligent algorithm.Genetic algorithm has been widely applied in many fields,such as fast random search,parallel computing and scalability.Therefore,this paper set up the composite frame structure of BRBs lateral stiffness ratio of the variable ideas,build optimization program based on genetic algorithm,the lateral stiffness of the structure of each layer were optimized,get the optimum structural seismic performance and economy of the BRB design results.The main research contents and results are as follows:1.The buckling restrained braced composite frame structure is introduced,the lateral stiffness ratio,the development and research status of genetic algorithm are summarized,and the significance of genetic algorithm applied to the optimization research of buckling restrained braced composite frame structure is analyzed.2.The application method of genetic algorithm in the composite frame structure of anti buckling support is analyzed.Through improving the parameters of genetic algorithm to fit the model structure of this paper,the analysis model of buckling restrained braced composite frame structure is analyzed,and the cooperative relationship between buckling restrained brace and composite frame is determined,and the mathematical model of program optimization is defined.3.Structure design,fixed lateral stiffness ratio and optimum design program,analyzed the elastic static analysis,nonlinear and dynamic nonlinearity on the structure in 7 seismic waves,compared to the maximum inter story displacement angle and base shear limit value,and the total cross-sectional area of BRB limited value and the fixed lateral stiffness ratio of three kinds of scheme design of the seismic response of structure.The analysis results show that the structure with different lateral stiffness ratio can effectively reduce the support amount under the same seismic performance,and the seismic performance of the structure can be effectively improved under the same support amount.4.The BRB impact location in the plane of the structure of the seismic performance of the BRB core plate section area is determined,the seismic performance analysis of the 6different positions of the supporting structure,preferably can exert anti buckling support of support arrangementeffect.After determining the section area of the buckproof support core,the shape and size of the supporting components are designed.5.Combined with the research results of the buckling restrained brace’s section design method and the location of the support layout,the reinforcement and retrofit of the buckling restrained brace for the actual engineering is carried out to meet the higher seismic fortification requirements.Based on this,a set of design method for the composite frame structure of anti buckling support is put forward.The visualization of the optimization program is designed to facilitate the popularization and application of the engineering design.