Research On Seismic Performance Of Super High-Rise Frame-Core Tube Structure

The high-rise building not only satisfies people's basic material needs,but also contains the crystallization of human wisdom such as construction technology,art culture,ecological science and so on.The high-rise building can reflect the level of economic development,equipment manufacturing and engineering technology of a country.With the rapid development of China's economy,more and more high-rise buildings have been erected,and more and more structural forms have been applied to super high-rise buildings.Among them,the frame-core tube has flexible space layout and anti-side performance.Good advantages have become the most widely used super high-rise building structure system.However,as the height of buildings increases,the structure is increasingly threatened by earthquakes.Therefore,it is necessary to conduct in-depth research on the seismic performance of super-tall buildings.Firstly,this paper takes an over-limit super high-rise frame-core tube structure as an example to examine the structure beyond the limit,and determines the seismic performance level and seismic performance target of the structure based on the over-limit situation.The comparison between PKPM and Midas Gen is performed.The performance of the structure under multiple earthquakes was calculated and the structure was supplemented by time-history analysis.In order to further study the seismic performance of structures under rare earthquakes,dynamic elasto-plastic analysis of the structures was conducted using Midas Building,and the maximum inter-layer displacement angle,bottom shear force,natural vibration period and other indicators under the rare earthquake were adopted.Determine whether the structure meets the performance requirement of “not to lose the big earthquake”.By studying the plastic yield conditions of frame beams,frame columns and shear walls,it is judged whether the structure meets the requirements of performance design.This paper compares and analyzes the effect of different reinforcement layer setting schemes on the seismic performance of the frame-core tube structure.The analysis results show that the reinforcement layer can improve the overall seismic performance of the structure,but it is easy to generate a weak layer at the position of the reinforcement layer.When strengthening the floor,it is necessary to make a reasonable selection of the placement and arrangement of the reinforcement floor.Secondly,this paper establishes three calculation models,and compares the spectral properties of each model,the structural displacement,the internal forces of the frame columns,and the plastic yield of the frame columns to study the seismic performance of the SRC column in the frame-core tube.The results show that the SRC Columns can increase the ductility of the frame columns,increase the stiffness of the structure,and enhance the ability of the structure to resist horizontal seismic forces.Finally,six computational models are established in this paper.By comparing and analyzing the spectral characteristics of each model,the structure displacement,the internal force of the structure,and the performance of the structure under the action of rare earthquakes,different reinforcement layers are selected to study the seismic resistance of the frame-core structure.The impact of performance.The analysis results show that the reinforcement layer can improve the overall stiffness of the structure,change the internal force distribution of the structure,make the frame bear more shear force and bending moment,which is beneficial to the improvement of the seismic performance of the structure,but the reinforcement layer can easily be located in the reinforcement layer.The location produces a weak layer and damage occurs.Therefore,when the reinforcement layer is arranged,a reasonable choice is made for the arrangement position and number of reinforcement layers.