Design And Evaluation Of High-rise Steel Frame With Energy Dissipation And Earthquake Reduction

The self-resetting damper has good self-resetting ability and certain energy consumption capacity,which can effectively reduce the response of steel frame structure under earthquake.Performance-based seismic design can achieve different performance requirements under different seismic levels.The displacement-based performance design of the energy-consuming and shock-absorbing structure system can be equipped with energy-consuming devices in the existing structure,so that the energy-consuming and shock-absorbing system can meet the performance requirements under the corresponding seismic level.In order to apply the selfresetting damper to the high-rise steel frame structure to make it an energy-consuming and seismic-absorbing structural system,this paper proposes a performance design method based on MPA.In addition,in order to have a more comprehensive understanding of the seismic performance of the structure,this paper also evaluates the energy dissipation structure from the energy point of view based on the damage model.The main work of this paper is as follows:(1)The elasto-plastic time history analysis program of the energy dissipation structure system with self-resetting dampers is improved.In MATLAB,the damper is first numerically simulated based on the Brinson constitutive,and then the damper is set on the first layer of a five-layer shear model to make it a controlled structure,and the elastic time history analysis of the controlled structure is performed.And compared with the analysis results without dampers,it is found that the dampers can effectively reduce the displacement response of the structure;the two-line model is introduced,and the elastoplastic time history analysis of the same controlled structure is carried out.(2)The calculation formula of the equivalent damping ratio of the self-resetting damper is suggested.For the self-resetting damper in the article,based on the summarization of the parameters of the damper,based on the strain energy method,the equivalent damping ratio calculation formula determined by the stiffness coefficient and ductility coefficient of the damper after yielding is given.(3)A performance design method based on MPA for shock-absorbing high-rise steel frame structures is given.The design method includes the performance analysis of the main structure based on the MPA method and the parameter design method of the self-resetting damper based on the equal stiffness distribution.In the performance analysis of the structure based on the MPA method,the elastic-plastic stage of the structure is performed,and the yield reduction coefficient R is used to reduce the elastic demand spectrum.The self-resetting damper is based on the parameter design method of equal stiffness distribution,which decouples the additional damping ratio of the energy dissipating damping system into the product of the equivalent damping ratio of the damper and the strain energy ratio;it can be simultaneously adjusted by adjusting the strain energy ratio.Control the additional damping ratio and additional stiffness of the damper to the main structure,so that the energy dissipation capacity of the damper can be fully utilized;finally the method is applied to a high-rise steel frame.(4)For the shock-absorbing steel frame with self-resetting dampers,an energy-based seismic evaluation method is introduced.This method mainly starts from the energy consumption capacity and energy demand of the structure,and then evaluates the structure based on the damage model.The main content of the method includes the determination of seismic input energy,cumulative hysteretic energy demand,inter-layer distribution of accumulated hysteretic energy demand,and structural energy consumption capacity.