Research On Optimal Design Of Steel Frame-Steel Plate Shear Wall Structure

The steel frame-steel plate shear wall structure system has been widely used in high-rise buildings because of its excellent seismic performance.According to the engineering experience,the section sizes of the components was optimized after the steel plate shear wall form was determined firstly in the traditional optimization method.The synergy between the steel frame and the steel plate shear wall was ignored in this method,which leads to the design scheme was neither a ture optimization scheme nor an accurate economic and engineering guide.In addition,the seismic performance of this kind of structural system was less researched.The failure mode and shear force distribution of different steel plate shear wall layouts under earthquake action were not clear.Therefore,an improved genetic algorithm was used in this thesis.The optimization design of the structural system was completed through the MATLAB calling ANSYS firstly,and then the optimized schemes were carried out by dynamic time history analysis.The main work in this thesis include:Firstly,an improved genetic algorithm was established by introducing direction-based heuristic crossover operators,substitution operations,adaptive mutation operators and elite scheme.Then,the feasibility and superiority of the improved genetic algorithm were verified by four test functions and a case of three-bay,five-storey steel frame-steel plate shear wall structure.Secondly,a simplified analysis model of steel plate shear wall which suitable for optimization design was introduced by summarizing the research on this aspect.Then,combined with engineering practice,the introduction of section variable and steel plate shear wall topology variables,the mathematical model of steel frame-steel plate shear wall structure system optimization was proposed.Finally,using birth and death element in ANSYS to realize the transformation of steel plate shear wall layout,the optimization of the three cases of three-bay,five-storey steel frame,three cases of three-bay,ten-storey steel frame and three cases of three-bay,twenty-storey steel frame has been done by using the improved genetic algorithm.The results show that for the steel frame-steel plate shear wall structure system with different layers,the ratio of the shear force of the steel plate shear wall is related to the layout of the steel plate shear wall,and the relationship with the weight of steel plate shear wall is not obvious.As the ratio of the shear force of the steel plate shear wall increases,the weight of the steel frame can be effectively reduced,thereby achieving the purpose of material saving.The optimized steel plate shear wall layout scheme is not only lighter than the conventional layout scheme,with the increase of the number of layers,the weight reduction is more obvious,but also the material properties can be utilized under the premise of satisfying various constraints.At last,the seismic performance analysis of three cases of three-bay,ten-storey steel frame and three cases of three-bay,twenty-storey steel frame was carried out by dynamic time history analysis,and the seismic performance of this kind of system under dynamic action was discussed.The results show that the design principle of the double anti-side force system can be met when the steel frame-steel plate shear wall structure system is designed reasonably under different steel plate shear wall layouts.The optimized steel plate shear wall layout scheme not only has more shear force shared by the shear wall than the conventional layout scheme,but also has a smaller inter-story drift ratio than the conventional layout scheme.The optimized steel plate shear wall layout scheme has a greater safety margin.