Study On The Setting Scheme Of Reinforcement Floor Of A Super High-rise Structure In Low Intensity Zone

With the rapid development of cities and the increasingly scarce land resources,high-rise and super-high-rise buildings have become the main development direction of urban buildings.Frame-core tube structure is one of the most frequently used structural forms in high-rise and super-high-rise buildings.High-rise and super-high-rise buildings are more affected by horizontal loads with the increase of structural height,and they are usually prone to fail to meet the requirements of codes due to large horizontal displacements.Laying reinforcement stories in high-rise and super-high-rise buildings can improve the lateral stiffness of the structure and significantly reduce the horizontal displacement of the structure.Therefore,laying reinforcement stories in high-rise and super-high-rise buildings has become a simple,efficient and widely used method.At present,the research on the optimum location of the reinforced layer mainly relies on the theoretical analysis and formula derivation of the simplified plane model to calculate the optimum location of the reinforced layer.Because the simplified model is used as the basis for analysis,the results often have greater ideality.At present,the research on the optimal number of reinforced stories is mainly based on the change of the number of reinforced stories with the same stiffness as variables,without controlling the total material consumption of each reinforced story,and the research results on the setting of reinforced stories of super-high-rise structures in low intensity areas are relatively few.Therefore,this paper relies on a proposed super-high-rise frame-core tube structure in 6 degree areas for modeling and analysis.The applicability of strengthening stories for super high-rise structures in low intensity areas is investigated,and the setting modes of strengthening stories and their effects on structural performance are also studied.Based on the background of a planned super high-rise building in 6 degree zone,this paper studies the applicability of setting up reinforced storey for super high-rise structure in low intensity zone by establishing structural model with reinforced storey and model without reinforced storey and analyzing two different models from the perspective of economy and structural mechanics performance.The optimum location and quantity of strengthened stories are studied for different design positions and numbers of strengthened stories.At the same time,the dynamic elastic-plastic analysis is carried out for the optimal scheme S6 and other schemes S3 for setting reinforcedstoreys in super high-rise buildings to verify whether the optimal scheme of reinforced storeys obtained by elastic analysis is still the best scheme considering the elastic-plastic state of the structure.The main conclusions are as follows:(1)Under the background of this project,the construction cost of the super high-rise structure can be significantly reduced by setting reinforcement stories,which can effectively increase the stiffness of the structure,reduce the displacement,and increase the comprehensive benefits by increasing the use space.(2)The dichotomy method and the method of searching the optimum location of the reinforced story based on the maximum interlayer displacement angle are proposed.The effectiveness of the method is verified by an example.(3)Based on the analysis,the optimum number of reinforced stories in the background project is 6,which are located at 20,31,43,52,61 and 70 stories respectively,which provides a reference for the implementation of the project.(4)Under rare earthquakes,the maximum peak displacement of scheme S6 is less than that of scheme S3.The damping energy consumption of the structure is larger,the total internal energy of the structural components is smaller,and the seismic energy transferred to the structural components is smaller.The damage of frame columns and core tube shear walls is relatively small,and the damage of frame beams and connecting beams as energy dissipation members is more serious.Under the elastic-plastic condition,the optimum scheme of strengthening story is still S6.