| The development of shear wall structure of high-rise residential buildings can alleviate the situation of rapid population growth and urban land shortage brought by urbanization process.However,the construction scale and construction period of high-rise shear wall are generally large,and the investment cost is high.In addition,the solidifying thinking and time efficiency of the designers in the scheme design lead to the structural scheme design is too conservative,which will produce unnecessary waste.Through the structural optimization design,the optimal design scheme can be well optimized and the construction cost of the structure can be reduced.However,after the traditional optimization design process,the economic performance of the structure scheme is guaranteed,the safety of the structure will be reduced to a certain extent inevitably which has an adverse impact on the seismic performance of the structure.Therefore,it is necessary to find an optimal design method which can not only ensure the economy but also ensure the structural safety.In the concrete-filled steel tube,the bearing capacity and deformation capacity can be improved obviously because of the restraint effect of steel tube on concrete.Therefore,a new optimization idea is proposed: the first step is to optimize the design of shear wall structure based on the minimum eccentricity of the structure,and the second step is to replace the reinforced concrete shear wall with the concrete-filled steel tubular row column shear wall by the principle of equal quantity replacement of the same material.The paper analyzes the influence of plane layout and lateral stiffness of shear wall section on the overall performance of shear wall structure by using two finite element analysis software SATWE and PERFORM-3D.The feasibility of new optimization ideas is verified by optimizing and replacing the structure of a project case.The results are as follows:(1)SATWE is used to analyze the influence of shear wall structure layout and shear wall section lateral stiffness on structural mechanical properties.The results show that the plane layout of shear wall has an important influence on the eccentricity of the structure.The unreasonable arrangement position will cause the increase of the eccentricity of the structure,which will aggravate the torsional effect,produce large torsional deformation,and then affect the seismic safety of the structure;Under the condition of maintaining the lateral stiffness of the shear wall section,changing the length,thickness and concrete strength grade of shear wall will have different effects on the overall performance of shear wall structure.When the wall thickness is kept unchanged,increasing the concrete strength grade and reducing the length of the shear wall will reduce the overall lateral stiffness of the structure,and increase the period,interlayer displacement and interlayer displacement angle of the structure.When the length of the wall remains unchanged,the strength grade of the concrete is improved,the wall thickness is reduced,the overall lateral stiffness of the structure is improved,and the period,interlayer displacement and interlayer displacement angle of the structure are reduced.(2)Through sensitivity analysis,when the increase of project cost is certain,the change of the total lateral stiffness caused by the change of the shear wall length is about 3-4 times of the change of thickness;the change of the total lateral stiffness caused by the change of the shear wall thickness is about 0-1 times of the change of concrete strength grade.Therefore,the most effective measure to improve the total lateral stiffness of the structure is to change the shear wall length.(3)Taking a project in Shandong Province as the research object,this paper explores the structural optimization design method of shear wall structure of high-rise residential buildings and its application feasibility in engineering.The design optimization of shear wall structure is carried out in order to minimize the eccentricity of the control structure.The comparative analysis of the structural model before and after optimization by SATWE shows that the response of the optimized structure’s period,period ratio,displacement ratio,story displacement angle and axial compression ratio tends to be consistent in the x-axis and y-axis,the mechanical properties of the structure are more reasonable,and the cost is lower.(4)The reinforced concrete shear wall is replaced by the concrete-filled steel tubular row column shear wall by the principle of equal replacement of the same material.The Pushover analysis of the reinforced concrete shear wall model and the steel tube row column shear wall model is carried out by the PERFORM-3D finite element software.The results show that,due to the restraint effect of steel tube on concrete in the steel tube row column shear wall,Compared with the reinforced concrete shear wall model,the top displacement and the maximum interlayer displacement angle of the steel tube row column shear wall model are significantly reduced,and the lateral stiffness and bearing capacity of the structure are significantly improved,so that the steel tube row column shear wall has higher seismic performance.(5)The elastic-plastic time history analysis of reinforced concrete shear wall model and steel tube row column shear wall model is carried out by using the PERFORM-3D finite element software.The results show that the natural vibration period,interlayer displacement and interlayer displacement angle of the steel tube row column shear wall decrease compared with the reinforced concrete shear wall.The structure of the steel tubular row column shear wall does not change the energy consumption mode of the original structure,which is still dominated by reinforced concrete coupling beam and frame beam.Compared with the reinforced concrete shear wall,the energy consumption of the steel tube row column shear wall is increased.Therefore,the shear wall with steel tube columns can effectively improve the seismic performance of the structure. |
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