Seismic Analysis Of A High-Rise Frame-Core Tube Structure

Earthquakes are one of the most dangerous natural disasters to human.China is located in the world’s two most active earthquake belt,so the earthquake caused great losses to people’s life and property.Many of the earthquake experiences tell us that through the construction of seismic fortification can effectively reduce the damage to the building.Therefore,it is necessary to select the appropriate seismic analytic method,and on this basis to design the seismic structure and components.The overrun structure is beyond the scope of the specification of the design procedure,so it is of great importance to carry out the seismic analysis.This paper focus on a 211-meter super-high-rise framecore tube structure.In view of its height exceed limit and irregular plane,the dynamic response rule and failure mechanism under earthquake are studied to evaluate its seismic behavior.This paper contains the following parts:(1)Through sorting out the seismic action analysis method and design method of structures,this paper did comparative analysis of the advantages and disadvantages of the main seismic design method and its application scope.(2)ETABS and midas Building finite element program are used to establish the elastic model of the structure.By comparing their results of mode-superposition response spectrum method under earthquake,so as to verify the rationality of the structural arrangement of the structure.(3)On this base,the ETABS program is used to calculate the elastic time-course,and the elastic responses under three seismic waves can be obtained.Comparing the differences of its results with the value of mode-superposition response spectrum method.(4)The elastic-plastic model of the structure is established based on the Perform-3D finite element program,and the nonlinear response of the structure,the damage degree of components,the energy consumption of components and structures under rare earthquakes is analyzed,and then evaluate the seismic performance of the whole structure.The results show that:(1)the elasticity of the structure under frequent seismic actions is within the limits of the specification,and the validity of the model and the rationality of the structural system are verified.(2)The overall lateral stiffness is big and there is no weak layer under rare earthquake;the coupling beam and the frame beam first enter the nonlinearity,the plasticity degree is relatively deep;while most of the shear wall and the frame column are in the elastic state;the plastic energy consumption of the component is not very high in the total energy,and the seismic energy is mainly dissipated by damping energy dissipation and strain energy.(3)According to the calculation results of Perform-3D elastic-plastic time-history and based on China’s seismic code,the structure is in moderate failure stage,which indicates that the structure has good seismic performance to meet the requirements of seismic fortification.(4)Perform-3D has good applicability in dynamic elastic-plastic analysis of super high-rise structures.The seismic analysis method and the related parameters used in this paper can provide reference for the seismic design of super high-rise structures.