Design Optimization Of Super High-rise Frame-core Tube Structure Based On Level Adjustment Method

Super high-rise buildings have the characteristics of large investment and long construction cycle.Its design stage is a very important link,which affects more than half of the investment costs.Therefore,under the premise of ensuring that the seismic performance meets the requirements of the specification,it is necessary to optimize the design of super high-rise buildings to reduce the project cost.The frame-core tube structure,which combines the advantages of frame structure and shear wall structure,has great lateral stiffness and flexible plane layout.It has been widely used in high-rise and super-high-rise buildings,and has become a hot topic of social research.It is a common optimization method for the structural design of high-rise and super high-rise buildings to get an ideal structural scheme by comparing different structural types and layout schemes.After determining the structural scheme,the designer adjusts and optimizes the section of vertical members,which not only makes the structural force more reasonable but also brings significant economic effects.Firstly,this paper designs three structural schemes for practical engineering,all of which adopt the frame core tube structure system.Reinforced concrete shear walls are used in all the three structural schemes,but the external frame columns are of different types.The reinforced concrete columns are adopted on all floors of the scheme 1;the steel reinforced concrete columns are used on the lower floors of the scheme 2,and the reinforced concrete columns are used on the upper floors;the steel reinforced concrete columns are adopted on all floors of the scheme 3.Multi-storey and high-rise building structure analysis and design software SATWE was used to compare and analyze the performance of the three structural schemes,in order to study the impact of different types of frame columns on the structural performance.The analysis results show that the addition of section steel to the frame column can improve theoverall lateral stiffness of the structure under the same column section,but whether the whole floor is equipped with section steel concrete column has little influence on the overall lateral stiffness of the structure.Then,the vertical component section size and structure layout of the initial structural scheme are optimized by the level adjustment method.The gravity load effect of the structural hinge model before and after leveling and the seismic performance of the rigid joint model before and after leveling are compared and analyzed,and the elastic time history analysis is used as the calculation supplement.The analysis results show that the leveled structure reduces the vertical deformation difference between the shear wall and the frame column;the weight of the structure is reduced,the overturning moment and shear force of the base are reduced,the internal force distribution is more reasonable,and the overall indicators meet the requirements of the code;The economic effect brought by leveling optimization is remarkable,and the result of elastic time history analysis conforms to the specification.Finally,the elasto-plastic dynamic time history analysis of the leveled structure is carried out by using SAUSAGE software to analyze the deformation of the whole structure under rare earthquake and the damage of the structural members.The analysis results show that under the action of rare earthquake,the maximum inter-storey displacement Angle of the leveled structure meets the requirements of the code;the frame column basically has no damage,the shear wall body is basically intact,only part of the shear wall at the bottom floor is slightly damaged at the connection with the connecting beam;the energy dissipation effect of the connecting beam is obvious,the seismic energy dissipation mechanism of the structure is reasonable,and the structure still has a large seismic bearing capacity.