Research On Seismic Performance Of High-rise Building Structures With Steel-concrete Beam-type Transfer Stories

With the development of high-rise buildings towards multi-function,high-rise building structures with transfer floors are used more and more.Various composite components are widely used in transfer floor structures with the advantages of high bearing capacity,high stiffness,good plasticity and durability.At present,the research on the transfer floor structure mostly focuses on the component performance and joint performance,and the overall seismic performance evaluation of the structure is lack.This thesis takes a frame supported shear wall structure with steel reinforced concrete transfer floor as the research object,from the overall inter story displacement angle index to the local component damage and material deformation index,through the multi parameter seismic performance evaluation method,Based on the above analysis results,the applicability of static elastic-plastic analysis methods with different loading modes in transfer story structures is compared.The main contents of the study include:(1)Taking a frame-supported shear wall structure with a steel-concrete transfer story as an example,the nonlinear analysis software Perform3 D is used to obtain the response data of the structure under ground motion by the incremental dynamic analysis(IDA)method.And try to use the existing method to directly obtain the performance point according to the IDA curve.The analysis results show that: due to the randomness of the ground motion,the IDA curve will appear "hardening" locally,and the slope of the curve will increase,which will affect the accuracy of the performance point.Vertically discontinuous with a transition story structure.(2)According to the data obtained by IDA analysis,taking the macroscopic interlayer displacement angle as the index,the seismic vulnerability analysis of the structure is carried out,and the vulnerability curve and the vulnerability matrix are established,and it is concluded that the structure exceeds each limit under different ground motion intensities.The probability of the state,as a whole,proves the seismic performance of the structure.In order to comprehensively evaluate the seismic performance of the structure,in addition to the overall interstory displacement angle index,this thesis also analyzes the damage of structural components under rare earthquakes with the help of structural seismic performance design software PBSD from the perspective of component damage and material strain limit.,distribution and energy consumption.The results show that the structural component damage and component energy consumption are mainly concentrated on the beam components,and the floors with the most serious component damage and the floors with the largest inter-story displacement angle are not in one-to-one correspondence.(3)Compared with the IDA analysis method,the static elastic-plastic analysis method(Pushover method)is simple and practical,and has high calculation efficiency.It can quickly evaluate the elastic-plastic performance of target structures under rare earthquakes.However,the degree of influence of this high-order mode shape is still unclear,especially when analyzing complex structures,the accuracy of the results is insufficient.Based on the calculation results of IDA,the applicability of the multimodal Pushover analysis method(MPA)and the Pushover method of different lateral force modes in the transformation structure are compared.The results show that for floors far from the transfer story,the MPA method has the best prediction effect on the internal force response of the transfer story structure under earthquake,which is closer to the calculation results of IDA,but for the transfer story and nearby floors,more in-depth research is needed.