Research On Seismic Performance Of Frame-core Tube Super High-rise Building Based On Performance Objective

The fast-growing Chinese economy has provided the material basis for the development of super high-rise buildings,and the urbanization process and dense population have further increased the number of super high-rise buildings.Compared with buildings of ordinary height,super high-rise buildings will be more threatened by earthquakes,and their seismic performance needs to be analyzed in depth.However,the response spectrum method currently applied to conventional projects is essentially a linear maximum response combination,the result sometimes will be inaccurate under a special condition.Therefore,this paper introduces elastic time analysis and elasto-plastic time analysis based on the seismic design theory of performance to make the performance analysis calculation of super tall buildings closer to the real force state,to design,analyze and study engineering examples,and to verify the safety of the selected structures.The purpose of this paper is to study the most widely used frame core structure system,so a super high-rise building project with frame core structure is taken as the engineering background,and the building performance target is set as Class C after considering the function,scale and tower height,seismic intensity and other engineering background.The structure selection is carried out by comparing the foundation settings of the reinforcement layer cantilever truss,gable truss and gable beam section.Then,two softwares,YJK and midas Building,are used to test the seismic performance of the proposed structure,and it is analyzed in detail whether the performance indicators of the proposed structure can meet expectations under the action of frequent earthquakes,fortification earthquakes and rare earthquakes.First of all,according to the control index required by the code,this paper uses the equivalent elastic response spectrum analysis method to check the state of the proposed structure under the action of frequent earthquakes,to ensure that the proposed structure basically maintains elasticity,and then uses the elastic time history analysis method to analyze the selected seismic waves.The calculation results of the equivalent elastic response spectrum analysis method and the elastic time history analysis method are compared to ensure the accuracy of the results.Secondly,under the action of the fortification earthquake,the equivalent elastic response spectrum analysis method is used to calculate the mid-seismic elasticity and non-yield of the proposed structure to ensure that it meets the control indicators specified in the code,and then the midas Building software is used to supplement the elastic-plastic time history analysis method.Check the conditions under the selected seismic wave,including the development history of structural elastoplasticity and the damage degree of components,and check whether the components can achieve the expected performance targets.Finally,the equivalent elastic response spectrum analysis method is used to calculate the internal force of each component under the action of rare earthquake,and the strength of the component is checked to check whether it reaches the expected performance target.The elasto-plastic evolution history of the structure and the damage of the components under the action of the horizontal earthquake are checked,and whether the components can achieve the expected performance target is checked.This paper selects a reasonable structural scheme according to the engineering summary and design specification of a super high-rise building,and comprehensively demonstrates the seismic performance of the structural scheme: it can achieve the expected performance targets under the action of frequent earthquakes,fortification intensity earthquakes and rare earthquakes,which can provide some reference values for the seismic design and analysis of super high-rise building structures in the future.